government of india technical specfication for 25kv …
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Draft spec No. TI/SPC/PSI/FC&SR/1210 Page 1 of 48
GOVERNMENT OF INDIA
MINISTRY OF RAILWAYS
TECHNICAL SPECFICATION FOR
25kV SHUNT CAPACITOR AND SERIES REACTOR EQUIPMENT
FOR
2X25 KV AT FEEDING SYSTEM
DRAFT SPECIFICATION No. TI/SPC/PSI/FC&SR/1210
AUGUST 1989
This Specification supersedes the Specification No. ETI/PSI/126(08/1989)
with A&C Slip No. 1 to 3.
ISSUED BY
TRACTION INSTALLATION DIRECTORATE
RESEARCH DESIGNS AND STANDARDS ORGANIZATION
(MINISTRY OF RAILWAY)
MANAK NAGAR, LUCKNOW-226011.
Prepared By Checked By Approved By
Signature
Date
Designation
367323/2021/O/o PED/TI/RDSO541
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Specification No.
ETI/PSI/126(8/89)
Specification for Shunt Capacitor Equipment for 2x 25 kV a Feeding System.
1.0 SCOPE:
1.1 It is to be noted that “The Make in India Policy of Government of India shall be applicable.”
1.2 All the provisions contained in RDSO’s ISO procedures laid down in Document No. - QO - D-8.1-11 Ver. 1.2 dated 22.06.2020 (titled
“Vendor changes in approved status") and subsequent versions/amendments thereof, shall be binding and applicable on the successful vendor/vendors in the contracts floated by Railways to
maintain quality of products supplied to Railways.
1.3 This specification covers design, manufacture supply, testing and
commissioning of shunt capacitor equipment intended for outdoor
installation on 55kV or 25 kV side a traction sub - station of 2 X 25 kV
AT feeding system on Indian Railways for improvement of power factor
and reduction of maximum demand.
1.4 The shunt capacitor equipment shall be complete with control-gear,
protective relays, series reactors and accessories necessary for its
efficient operation.
1.5 All such items and accessories shall be deemed to be within the scope
of this specification whether specifically mentioned herein or not. The
Shunt capacitor shall be installed by Railways under the supervision of
the contractor, who shall however commission the equipment. The
equipment shall be erected by the vendor, therefore, the offer shall
include deputing of engineers and supervisors by the supplier of
equipment for adequate handling, installation, testing and
commissioning to the satisfaction of Railway’s engineers at site.
1.6 All civil engineering works connected with foundations of the capacitor
banks, circuit breaker, isolator, series reactor, current & potential
transformers, supporting steel structures for the equipment etc shall
also be done by the contractor.
1.7 All associated items of HT shunt capacitor bank assembly like Series
reactor, CT, PT, LA, CB, isolators, protection relays & panels etc.
should be procured from RDSO/CORE approved vendors.
2.0 GOVERNING SPECIFICAIONS:-
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2.1 The shunt capacitor and associated items shall, unless otherwise
specified herein, conform to the latest revision of RDSO specification,
Indian Standard specifications/IEC Recommendations as indicated
below and the Indian Electricity Rules, wherever applicable:
i. IS:513 Cold rolled carbon steel sheets.
ii. IS:800 Code of practice for use of structural steel in general building construction.
iii. IS: 1554(pt. II) PVC insulated (heavy duty) electric cable pt. II for voltage above 1 kV.
iv. IS:2099 Bushings for alternating voltages above 1 kV.
v. IS:2834 IS: 13925-1 Shunt capacitor for power systems.
vi. IS:3070 (Pt..I) Lightning arrestor for AC systems,
Non- Linear resistor type.
vii. IS: 3231 Electrical relays for power system
protection.
viii. IS:5553(Pt.II) 2026
(Part-6)
Power Transformers: Series reactor.
ix. IEC 60076-6 Power Transformers: Reactor
x. IS:11298(pt.3/sec.1) Specification for plastic films for electrical purposes: polypropylene
films for capacitors.
xi. IEC-70 60871 Power capacitors. Shunt Capacitors for
a.c. Power systems having a rated voltage above 1 000 V.
xii. IS- 12672 Internal fuse and internal over pressure disconnectors for shunt capacitors.
xiii. IEC 871-1 & IEC 871-2.
Shunt capacitor for AC systems having a rated voltage above 660 V.
xiv. RDSO specn. No. ETI/OHE/13(4/84)
with A & C Slip No. 1 to 4.
Specification for hot-dip zinc galvanization.
xv. RDSO specn. No. ETI/PSI/18(4/84)
TI/SPC/OHE/FASTERNERS/0120 Rev. 1
Specification for steel and stainless steel bolts, nuts and washers.
xvi. RDSO specn. No. ETI/OHE/27(6/87) TI/SPC/PSI/PROTCT/6
071 with A&C slip no.1
Control and relay board. Control and Relay panel for 25kV acts including specification for numerical
type protection relays for traction transformer, 25kV shunt capacitor
bank and transmission line for 25kV AC TSS on Indian Railways.
xvii. RDSO specn. No. ETI/PSI/71/Rev-1(1/87)
ETI/PSI/MOGTLA/0101(02/
15)
Metal oxide gapless type lightning arrestors. Metal oxide gap less type lightening
arrester for use on Railway traction substations and switching stations.
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xviii. RDSO Spec No. ETI/PSI/137(08/89)
with A&C Slip No. 1 to 7.
Metal oxide gap less type lightning arresters for use of 220/132/110/66kV
side of railway ac traction substation.
xix. RDSO specn. (CP) No.
ETI/PSI/93(5/87) TI/PSI/SPC/LVCBIN/0
120 (Dec,2013), Rev. 0
with A&C Slip No. 1
25 kV outdoor type, single pole, SF6
gas circuit breakers. 25 kV Single pole, Double Pole, Pole
mounted, outdoor Vacuum circuit breaker (VCB) and vacuum
Interrupter (BM) for Indian Railway.
xx. RDSO specn. (CP) No. ETI/PSI/120(7/87)
With A&C Slip No. 1
Code of practice for earthing of power supply installation for 25 kV A.C., 50
Hz Single Phase traction system.
xxi. IEC: 60071 Insulation co-ordination and system
engineering of high voltage electrical power installations above 1.0 kV AC
and 1.5 kV DC
xxii. IEC: 62271-1
High-voltage switchgear and control gear – Part 1: Common specifications
2.2 Any deviation from this specification, proposed by the tenderer vendor
calculated to improve the performance, utility and efficiency of the
equipment will be given due consideration provided full particulars of
the deviation with justification therefore are furnished. In such case,
the tenderer vendor shall quote according to this specification and the
deviations, if any, proposed by him shall be quoted as an alternate/
alternatives.
2.3 In case of any conflict between the contents of the above IS and this
specification, the stipulation of this specification shall prevail.
3.0 ENVIRONMENTAL CONDITIONS-
3.1 The shunt capacitor installation shall be suitable for outdoor use in
moist tropical climate and in areas subject to heavy rainfall, pollution
due to industry and marine atmosphere and severe lightning. The
limiting weather conditions which the shunt capacitor and associated
items have to withstand in service are indicated below:
i. Maximum ambient air
temperature Atmospheric
temperature
45 degree C
a. Metallic surface temperature under Sun: 75° C max. and in
shade: 55 C° max. b. Minimum temperature: - 10° C
(Also snow fall in certain areas
during winter season) c. Maximum ambient air
temperature - 500C d. Average ambient air temperature
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over a period of 24 hours - 350C
ii. Minimum ambient air
temperature
0 Deg. C
iii. Minimum Average
ambient air temperature over a period of 24 hours
35 degree C
iv. Maximum relative humidity
100 degree C %
v. Annual rainfall Ranging from 1750 to 6250 mm
vi. Maximum number of thunder storm days per annum
85 days
vii. Maximum Number of dust storms days per
annum
35 days
viii. Number of rainy days
per annum
120 days
ix. Atmosphere during hot
weather
Extremely dusty and desert terrain in
certain areas. The dust concentration in air may reach a high value of 1.6
mg/m³. In many iron ore and coalmine areas, the dust concentration is very high affecting
the filter and air ventilation system.
x. Coastal area The equipments shall be designed to
work in coastal areas in humid and salt laden atmosphere with maximum.
pH value of 8.5, sulphate of 7mg per liter, max. concentration of chlorine 6 mg per liter and maximum
conductivity of 130 micro siemens/cm.
xi. Basic wind pressure 200 216 kg/sq.m
xii. Altitude Not exceeding 1000 metres.
3.2 Vibrations -
The shunt capacitor installations would also be subjected to vibrations
on account of trains running on nearby railway tracks. The amplitude
of these vibrations which occur with rapidly varying time periods in the
range of 15 to 70 ms lies in the range of 30 to 150 microns at present
with the instantaneous peak going up to 350 microns.
4.0 TRACTION POWER SUPPLY SYSTEM ( 2X 25 KV AT FEEDING SYSTEM)
4.1 BRIEF DESCRIPTION OF THE 2 X 25 KV SYSTEMS.
In 2x25 kV system, power is fed from the TSS at 50 kV and utilization
is achieved at 25 kV by providing Auto-transformers of adequate
capacity and by providing one additional conductor normally referred
as feeder wire (similar to the return conductor in BT/RC system).
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Centre point of the Auto Transformer is connected to the earth/rail.
This arrangement facilitates +25 kV Voltage between OHE and rail and
-25 kV voltage between Rail/earth and the Feeder Wire.
4.2 Scott Connected Transformer Scheme:
(a) In this scheme 2 number Scott connected Transformers & 04
number Autotransformers are to be installed at a TSS along with
associated switchgear for Control & protection. The two windings of
a SCOTT transformer i.e. Main and Teaser windings are of equal
power rating and feed either side of the TSS independently. The
supply of both the windings is at a phase difference of 90 degree
and separated by neutral section provided near TSS. Out of two
Scott transformers only one is in operation and the other is on
standby.
(b) Scott Connected Transformer:
Scott- connected transformer of 60/84/100 MVA
(ONAN/ONAF/OFAF) is used to feed power to the traction system. It
has a voltage input on 220kV or 132kV, 3 phase, 50 Hz and two
independent secondary winding for output at 50 kV. The
Transformer has 2 secondary windings, one known as the main
winding and the other known as the teaser winding. The two
windings are identical in voltage and current rating but are in phase
difference of 90 degree. These two windings of equal power rating
i.e. Main & Teaser windings, feed power on either side of the TSS.
The feed of different phase is separated by neutral section provide
near TSS. The Scott Connected Transformer in ONAN Mode shall
feed the 30MVA Power to each side of the TSS.
4.3 V Connected Transformer Scheme:
(a) In this scheme, 3 single phase transformers are connected to
different pairs of 3 phases forming on open delta connection on the
primary side. Out of the 3 single phase transformers, one
transformer feeds the OHE on one side of the TSS, another
transformer feeds the OHE on the other side of the TSS and the
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third transformer remains as standby. The power supply on either
side of TSS is at a phase difference of 120 degree and therefore
separated by a neutral section provided near TSS.
(b) V- Connected Transformer:
In the above arrangement, 3 number 38/53/63 MVA
(ONAN/ONAF/OFAF) Open delta connected Transformers are to be
installed at a TSS along with associated switchgear for Control and
protection. In these single-phase transformers, there are two
secondary windings in each transformer. One terminal of these
secondary windings is connected with each other and connected to
Rail. The outer terminals of windings are connected to Feeder wire
and overhead contact/catenary wire respectively. Two transformers
shall be in operation at a time and one shall be stand by. In the V
connected Scheme, each transformer in ONAN mode shall feed the
38MVA Power in either side of the TSS.
4.4 GENERAL SCHEME:-
The electric power for railway traction is supplied in AC 50 Hz, single
phase through 2x 25 kV AT feeding system, which has feeding voltage
from the sub-station two times as high ( 2x 25 kV) as catenary
voltage (25 kV) . This high voltage power supplied from the traction
sub-station through catenary wire and feeder wire is stepped down to
the catenary voltage by use of auto transformers installed about every
13 to 17 km along the track and then fed to the locomotives. In other
words, both the catenary voltage and feeder voltage are 25 kV against
the rail, although the sub-station feeding voltage between catenary
and feeder is 50 kV. Therefore, the catenary voltage is the same as
that of the conventional 25 kV system.
Since the power is supplied in two times higher voltage , the 2x
25 kV AT feeding system is suitable for a large power supply, and it
has the following advantages, compared with conventional feeding
systems:
a. Less voltage drop in feeder circuit.
b. Large spacing of traction sub-station.
c. Less telecommunication interference by use of AT installed with
adequate spacing.
The power is obtained from 220/2 x 25 kV Scott connected
traction transformer or 132/2x25 kV Single phase transformers. The
primary windings of the single phase transformers are connected to
two or three phase of 132 kV, three phase, effectively earthed
transmission network of the electricity board, in case of a single phase
transformer or in case of two single phase transformers connected in V
respectively. On the other hand, the primary windings of the Scott
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connected transformers are connected to the three phases of 220 kV
three phase, effectively earthed transmission network of the Electricity
Board. The Scott connected transformer and V-connected single phase
transformers are effective in reducing voltage imbalance on the
transmission network of the Electricity Board. The spacing between
adjacent sub-stations is normally between 70 to 100 kms.
One outer side terminal of the secondary windings of traction
transformer is connected to the catenary, the other outer side terminal
being connected to the feeder. Two inner side terminals are, via series
capacitors or directly, connected to each other and their joint is solidly
earthed and connected to the traction rails.
The load current from the sub-station flows through the
catenary and returns to the sub-station through the feeder. Between
two adjacent ATs, the load current fed from the catenary to the
locomotive flows in the rail and is boosted upto the feeder through the
neutral tap at ATs at left and right sides of the locomotive.
At the points of sub-station and sectioning post, a dead zone
known as neutral section is provided in OHE to avoid a wrong phase
coupling. The power to the catenary and feeder on one side of the sub-
station is fed by one feeder circuit breaker, even if there exist two
breakers for on side, and each track is controlled by an interrupter.
The two breakers are used as a stand by for each other. For
maintenance work and keeping the voltage drop within limits, one or
more sub sectioning and paralleling posts ( known as SSP) are
introduced between traction sub-station and a sectioning and
paralleling post (known as SP). A SSP on a double track section
normally has four sectioning interrupters and one paralleling
interrupter. In case of fault, the feeder circuit breaker of the sub-
station isolates it.
A figure showing the principle of AT feeding system and typical
power supply diagram showing the general feeding arrangement at a
traction sub-station and sections of the OHE are given in the sketch at
the Appendix-I.
4.5 Protection system: -
4.2.1 The following relays are provided for the protection of traction
transformers.
a) Differential relay.
b) Over current relay on 220 kV or 132 kV side.
c) Grounding overcurrent relay on 220 kV or 132 kV side.
d) High speed over current relay on 220 kV or 132 kV side.
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e) Phase failure relay (to detect a malfunctions of a feeder
circuit breaker).
4.2.2 The following relays are provided for the protection of OHE:
a) Distance relay (with a parallelogram protection
characteristics).
b) Delta I type fault selective relay.
c) Under voltage relay.
4.6 25 kV OHE and Traction Transformer-Electric Parameters:
4.3.1 The OHE is made up of a stranded cadmium copper catenary of 65
sq. mm or a stranded aluminium alloy catenary of 116 sq. mm and
a grooved contact wire of 107 sq. mm, making up a total of 150 sq.
mm or 140 sq. mm copper equivalent, respectively. As a feeder wire
stranded aluminium alloy of 240 sq mm is used. The calculated OHE
impedance value of AT feeding circuit ( OHE; Al 116-Cu 107 sq.
mm. feeder wire; al 240 sq. mm ) for a single track line is 0.0601 +
jo.1419 Ohms /km (at 20 kV system impedance).
4.3.2 Traction transformer; the percentage impedance of 2x25 MVA,
220/2 x 25 kV scott connected transformer and 20 MVA, 132/2 x 25
kV single phase transformer are 12 % (at 207 MVA based) and 12%
(at 21.6 MVA base); respectively.
4.3.3 Clearance; Normally a clearance of 500 mm is provided between
any live part at 25 KV and earth.
4.7 Nature of faults on the OHE system
4.4.1 OHE ( including a feeder wire) is subjected to frequent earth faults
caused by failure of insulation, or by the OHE snapping and touching
the rail or earth, or by a piece of wire dropped by birds connecting
the OHE to earthed overlying structure, miscreant activities etc..
These faults are cleared by feeder circuit breaker which operates on
any one or both of the following relays:
a) Distance Relay (with a parallelogram protection characteristics)
b) Delta I type fault selective relay.
4.4.2 Short Circuit level; The 220 kV and 132 kV source impedance may
be, based on a 3 phase symmetrical short circuit level, between
2000 and 10,000 MVA, and between 1000 and 5000 MVA,
respectively. The level of short circuit on the 25 kV side for a fault in
the vicinity of a substation could be around 20 MVA or more. The
exact short circuit level on 25 kV side at each substation will be
indicated in the tender papers.
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4.8 Nature of load on the 25 kV system Power Factor Improvement:
4.8.1 The average Traction load considered as 30 MW due to frequent and
rapidly varying nature. The average power factor of electric traction
and multiple unit trains considered 0.8 lagging without
compensation and the desired power factor with capacitor bank 0.9
lagging. For Scott Connected TSS, 55kV, 4 + 4 MVAR capacitor bank
(it has been divided in two equal parts one for main winding and
another for teaser winding). For V Connected TSS, 25kV – 4 + 4
MVAR capacitor bank (it has been divided in two equal parts one for
each working transformer).
Traction load is of frequent and rapidly varying nature and may
fluctuate between no load and overloads, and the system is subject
to frequent short circuits due to earth faults. It is difficult to forecast
precisely the load cycle of traction service because of the non-
uniform pattern of traffic which is different on different days.
4.8.2 At present The conventional AC locomotives are fitted, for
conversion of AC to DC, with single phase bridge connection silicon
rectifiers with smoothening reactor for feeding the DC traction
motors. The ripple current is in the region of 25 to 40% which
introduces harmonics in the 25 kV power supply. In the near future,
Indian Railways would be introducing phase controlled a
symmetrical thyristor bridges (two bridges connected in sequential
control to improve power factor) which would further introduce
harmonics in the system. There are some locomotives based on
thyristor control, which are having higher harmonics generation.
The typical percentage of the current harmonics present in the
traction system with silicon diodes locomotives are given below:
Feeder current. 142 A
Feeder current 480 A
Percentage
3rd harmonics (150 Hz) 38.50 111.50
5th harmonics (250 Hz) 14.35 5.48
7th harmonics (350 Hz) 15.00 2.01
Current harmonics (%) with
Rectifier Thyristor
3rd harmonics (150 Hz) 15% 23%
5th harmonics (250 Hz) 6% 14%
7th harmonics (150 Hz) 4% 10%
4.5.3 In big yards and loco sheds, a large number of locomotives stand
idle with only the load of their auxiliaries drawing higher reactive
power. The load power factor as therefore, rather low.
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4.5.4 The average power-factor of electric locomotive and multiple unit
trains generally varies between 0.7 and 0.8 lagging, without
compensation.
5.0 TECHNICAL SPECIFICATION:
5.1 Rating and other particulars:
SN Description 55kV Scott Connected system
2x 25 kV, V-connected system
i System 2x 25 kV AT feeding system
ii Nominal system voltage
55kV 25 kV (phase to earth)
iii Variation in the traction supply
voltage
19 kV to 27.5 kV ( sometimes touching
30 kV)
iv Equipment voltage
class
72.5kV 52 kV
v Rated voltage
a) Capacitor bank
b) Reactor
87.20kV
13%
31 kV 40 kV
4 kV 13%
vi Rated frequency 50 Hz +/- 3% 50 Hz +/- 3%
vii Average power factor of the traction
system
Between 0.7 and 0.8 lagging (the exact
value to be indicated in the tender)
Between 0.7 and 0.8 lagging (the exact
value to be indicated in the tender)
viii Power factor desired after installation of the capacitor
0.9 lagging 0.9 lagging
ix Rated capacity (for fundamental wave): (Unit: kVar)
Equipment Capacitor Bank Reactor
400 (2 X 200) * 460 (2 X 230) 60 (2 X 30)
600 (2 X 300) 690 (2 X 345) 90 (2 X 45)
800 (2 X 400) 920 (2 X 460) 120 (2 X 60)
1200 (2 X 600) 1380 (2 X 690) 180 (2 X 90)
1,600 (2 X 800) 1,840 (2 X 920) 240 (2 X 120)
2,000 (2 X 1,000) 2,300 (2 X 1,150) 300 (2 x150)
* ( 2 x 200 ) means 2 halves of 200 kVar
x Harmonics in the system
as given in para 4.8.2 as given in para 4.8.2
xi Location of capacitor bank
Out-door Out-door
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xii The Standard ratings of HT capacitor bank
and reactor shall be
5.2 Constitution of Shunt Capacitor Equipment:
5.2.1 For Scott Connected Transformer:
i. The complete HT capacitor bank (with 13% series reactor) shall
have to be designed in two exactly similar parts. One bank shall
be between Main winding while other bank shall be connected
between treasure winding, in Scott connected system.
ii. The standard capacitor bank rating with 4S*4P combination,
546kVAR and 21kV capacitor units comes to 8750kVAR @ 87.2kV.
Refer to Appendix -III for constitutional of shunt capacitor
equipment.
5.2.2 For V- Connected Transformer:
i. The complete HT Shunt capacitor bank (with 13% series reactor)
equipment to be installed at traction sub-station for AT
electrification shall consists of two halves shunt capacitor
equipment , each rating voltage is 31 40 kV, for one phase. The
one shall be connected to the OHE and rail, and the other to
feeder and rail. Each half shunt capacitor equipment consists of
capacitor(s) and series reactor connected in series. Refer to
Appendix-II.
ii. The standard capacitor bank rating with 5S*8P combination,
220kVAR and 8kV capacitor units comes to 8800kVAR @ 40kV.
Refer to Appendix -II for constitutional of shunt capacitor
equipment.
5.3 Resonant condition and inrush current
The rating of capacitor bank shall be such that it does not resonate
with source impedance including transformer impedance and series
reactor (parallel resonance). It shall also not resonate with the series
reactor (series resonance) at any of the harmonic frequencies. It shall
also be ensured that the inrush current of the capacitor banks does not
exceed the maximum guaranteed value. Calculations shall be
furnished with the tender in respect of the inrush current and series/
parallel resonant frequencies.
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5.4 Capacitor Unit
5.4.1 Rating of the capacitor unit of the bank shall be 546kVAr, 21kV for
Scott connected Capacitor bank and 220kVAr, 8kV for V-connected
capacitor bank. The individual capacitor units of the bank shall be of
All polypropylene (APP) self- contained, outdoor type provided with
double bushing protected by external fuse or internal element fuses.
The bushings shall be of porcelain and shall be jointed to the case
by solder sealing or any other approved technique. Each capacitor
unit shall be built up of number of elements having a dielectric of
plastic film (polypropylene) between the aluminum foils as
electrode. The bushings shall be of porcelain and shall be jointed to
the case by welding or other approved technique (except soldering).
The minimum value of creepage distance for bushings shall be 25
mm per kV of the rated voltage appropriate class.
The capacitor elements shall be assembled in a stack closely
fitted into the container in order to reduce the amount of free
impregnation fluid. The container shall accommodate changes in
fluid volume due to variation in the temperature. Each individual
unit shall consist of a number of elements connected in series
parallel arrangement. The capacitor unit shall be capable of
withstanding transient over currents of high frequency and
amplitude occurring at the time of their switching in the circuit. In
case of capacitor unit is provided with internal fuse protection, each
element shall be protected by means of an internal fuse connected
in series and each capacitor unit shall have enough parallel elements
in each series group so that failure of 40% of elements in a series
group shall not give rise to more than:
a) 10% over voltage on healthy parallel units.
b) 60% over voltage on healthy parallel elements.
Each element shall be protected by means of an internal fuse
connected in series.
Each capacitor unit shall satisfactorily operate continuously at rated
voltage and shall withstand 30% over current (rms value) due to
over-voltages and harmonics. The unit shall also satisfactorily
operate with traction harmonic currents as indicated in clause 4.8.2.
Depending upon the actual capacitance value, which may be
maximum of the 1.15 time the rated capacitance Cn, the maximum
current may reach 1.5 times the rated current.
5.4.2 The polypropylene film conforming to IS: 11298 or latest shall be
checked for proper thickness, roughness, breakdown voltage
besides its physical appearance.
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5.4.3 The capacitor shall be impregnated with non PCB (polychlorinated-
Biphenyl) impregnation fluids which have excellent electrical
characteristics, low toxicity, low bio-accumulation and are
biodegradable.
5.4.4 The aluminium foil used shall be of very high purity and free from
materials like rolling oil and such other defects. The thickness of
aluminium foil used shall not be less than 6 5 microns.
5.4.5 The container of each capacitor unit shall be leak and moisture-
proof. The capacitor containers shall be made of CRCA steel sheets
of drawing quality generally as per IS: 513 or latest. The nominal
thickness of steel shall be 1.25 1.6 mm. The inside surface of the
container in contact with the impregnating fluid shall not be painted
and shall only be degreased and made rust free. The steel surface
exposed to weather shall be given a primer coat of zinc-chromate
and two coats of light grey enamel paint as per shade 631 of IS:5 or
latest.
5.4.6 Internal element fuse for capacitor unit shall comprise very high
grade quality special alloy wire. The raw material for fuse shall
comprise fuse wire, press board and insulating paper. These fuse
wire shall be checked for tolerance in dimension and uniformity in
finish and also for compatibility with the impregnating fluids. The
element fuse shall be current limiting type which shall operate in a
very short duration to isolate the faulty elements.
The fuse shall be capable of carrying both nominal current
continuously and inrush current. It shall operate at the minimum
available energy and should not explode while discharging maximum
available energy.
The construction of internal fuse shall be such that the residue of
fuse operations shall not contaminate the impregnating liquid.
The internal fuse shall be so designed that fuse operation under the
worst conditions will not cause a fire inside a unit. The internal fuse
shall be designed and tested as per IEC Publication:593 IS: 12672
or latest and test results furnished with each capacitor unit.
5.4.7 Each capacitor unit shall be provided with a directly connected
internal discharge device to drain the residual voltage from the crest
value of the rated voltage to 50 volts or less within 5 10 minutes of
disconnection of the capacitor from the source of supply.
This device shall be made from carbon resistors without lacquer coating.
5.5 Series Reactor (Harmonic suppression Reactor):
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A series reactor will be provided to make the resultant reactance of
capacitor- set inductive for 3rd harmonic or other higher harmonics for
the purpose of restraining the distortion of voltage wave form possibly
caused by the shunt capacitor. A series reactor has also another useful
effect on damping a transient phenomenon at the time of switching in/
on of the capacitor bank. Reactance of series reactor is 13 % of that of
capacitor. A series reactor shall be provided to limit the inrush current
and surge voltage at the time of switching ‘ON’ of the capacitor bank.
The series reactor, which is also meant to filter a part of the harmonics
generated by the traction loads shall have inductive reactance (XL)
equal to or greater than 13% of capacitive reactance (XC) of the
capacitor bank. The series reactor shall be non-shielded, outdoor type,
natural air-cooled, air cored, dry insulated type. The reactor shall be
rated for the maximum current including harmonic currents that would
flow through the capacitor bank under operating conditions mentioned
in Clause 4.8.2 The reactor shall be so designed that the variation in
milli-henry value due to manufacturing tolerance is less than + 3%.
The maximum losses in the reactor under rated current shall be
approximate to 10 kW ±10%. The material composition of the reactor
shall be aluminum. The reactor shall be tested for temperature rise
test at maximum continuous current.
5.5.1 The series reactor shall be of the type described below:
a) Oil emerged
b) Hermitically sealed
c) Natural air cooled
d) Magnetic shielding air core with non- load tap changer.
e) Steel tank
The Vendor shall provide complete system details of series reactor
and HT capacitor bank e.g. KVAr, XL, XC, Current, Voltage etc. to
the manufacturer of series reactor (OEM).
5.5.2 Performance Characteristics
i. Tolerance of induction value error 0 to 10 %
ii. Reactance value while passing 5 times
rated current
Not less than
90% of rated value
Reactors should be designed to facilitate easy lifting and provided
with lifting eyes or similar provisions to allow safe & rapid
installation.
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5.5.3 Lifting and handling instructions shall be furnished by the reactor
manufacturer. In case of heavy reactors, special crating and
transport precautions shall be taken by the reactor manufacturer to
keep stresses in the reactor within safe levels.
5.6 Basic insulation level:
The basic insulation level of the complete capacitor bank and other
associated equipments shall be as follows:
Description For 2X25kV System
For 55kV System
1.2 /50 micro second impulse withstand voltage ( peak)
250 kV (P) 325 kV (P)
1 minute wet power frequency
withstand voltage (rms)
105 kV
140 kV
5.7 Protection:
5.7.1 The capacitor bank shall be provided with following protective relays
and generally as indicated in appendix-II.
i. Over current relay with IDMT element with suitable settings.
ii. Over voltage relay- over voltage protection against system over
voltage shall be provided with an inverse tank characteristics
with suitable settings. The over voltage relay shall be energized
from a PT connected to the main bus bar on the incoming of the
circuit breaker controlling the capacitor bank. If required an IVT
of suitable ratio shall be used for matching the capacitor over
voltage withstand characteristics.
iii. Under voltage relay- in conjunction with the timer to enable the
capacitors to discharge before reclosure. Relay provided for this
purpose should have a high resetting ratio and shall be
connected to the bus PT. Also a time delay relay should be
enclosed with adjustable setting of 0 to 5 minutes to provide a
time lag before the breaker is reclosed. However, this relay
would not be required if a timer is included in the closing circuit
of its associated breaker to prevent its reclosing within 5
minutes.
iv. Un-balanced voltage protection- relay for unbalanced protection
of capacitor bank shall be provided with residual voltage
transformers. The offer shall include the residual voltage
transformers, of adequate ratio and burden also.
OR
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v. The capacitor bank shall be protected by means of unbalanced
current protection. The capacitor bank shall be connected as a
bridge and an unbalanced sensing current transformer provided.
The current transformer ratio shall be chosen so that even one
capacitor element failure can be detected. The relay used shall
be a harmonic insensitive over current relay with fixed time delay
characteristic. The time delay shall be set at approximate 0.1
second. Calculations shall be furnished to establish that
unbalanced protection shall operate before the over voltage
limits as given in clause number 5.4.1 are exceeded.
vi. Each capacitor element shall be protected by means of internal
fuse. The fuse shall be connected in series with each capacitor
element inside the capacitor unit to limit the effects of dielectric
failures. If the puncture of dielectric occurs, only one element
shall be disconnected and the capacitor unit continue to operate.
While selecting the fuse rating, it would be necessary to choose
proper tank current characteristic which in turn significantly
depends upon the cross section and circumference of the fuse.
Fuses chosen shall have adequate thermal capability and comply
with relevant IS, IEC specifications.
OR
vii. - High rupturing capacity fuses for protection of individual unit.
Each capacitor unit shall be individually protected by an HRC
(cartridge) fuse, suitably rated. While selecting the fuse ratings,
it would be necessary to take into account thermal efforts of
transient currents.
5.7.2 The tenderer vendor may propose any other protection which they
consider in their experience to be superior for the installation and
shall give full justification for the same.
Technical Specification No. TI/SPC/PSI/PROTCT/7102 or latest for Control
and Relay Panel including Numerical type protection relays for Scott-
connected/V-Connected Traction Transformers, OHE protection and Shunt
Capacitor Bank and AT Protection for 2x25 kV traction sub-station shall be
referred.
6.0 GENERAL ARRANGEMENT OF CAPACITOR BANK AND ASSOCIATED
EQUIPMENT.
6.1 The capacitor bank shall be of outdoor type, installed on a concrete
bed or mounted on steel racks for connection to the 55kV or 25 kV bus
through double pole isolator and circuit breaker (both the isolator and
the circuit breaker will be arranged by the purchaser). The capacitor
bank shall consist of groups of individual capacitor units, connected in
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series-parallel combination to deliver the rated output, at nominal
rated system voltage, rated frequency and other system conditions
detailed elsewhere. The number of parallel units in each series group
shall be such that failure of one unit shall not create more than the
rated over voltage units in the bank selected so as to satisfy the
conditions in clause No. 5.4.1. The capacitor bank shall be supplied
complete with mounting steel rack assembly, inter-connectors
between units, fuses for unit and group protection, insulators, suitable
earthing lugs including terminal connectors but without connecting
jumper to 55kV or 25 kV bus and any other material required to make
the bank complete in all respects for its satisfactory.
6.2 Mounting Arrangement:
6.2.1 The capacitor bank alongwith external fuses for unit protection if
provided and the series reactor shall be suitable for mounting on
steel racks which in turn shall be mounted on a concrete plinth with
rack insulators and other hardware etc suitable base frames. There
shall be an expanded metal enclosure to the steel racks on which
capacitor bank and reactor are mounted. The racks shall be
complete with rack insulators and other hardware.
6.2.2 The manufacturer will provide an asbestos roof over the capacitor
bank to protect against direct exposure to the sun. The assembly
shall be of two tier arrangement suitable for erection within a floor
area of 3400 x 1100 mm. In case the manufacturer guarantees the
normal functions of a capacitor bank without any roof, it is not
necessary for him to provide the roof.
6.2.3 The Vendor is free to suggest any other arrangement for mounting
the capacitor bank and reactor which is considered economical
without sacrificing the safety of the personnel working in traction
substation. Full details of such arrangements shall be furnished with
the tender.
7.0 CONTROL PANEL
7.1 Control and relay panel for capacitor bank
The control panel having the relays for the capacitor bank shall be
supplied and installed by the tenderer in the control room of
unattended remote control traction sub-station. The control panel
shall be of vertical mounting, self-supporting steel construction back
to back duplex corridor type. The corridor shall be provided with a
lockable door at either end permitting free access to all instruments,
components, wiring, terminal connections, test block etc. Stove
enameled painting shall be done on the panel. The colour of the panel
shall be ‘Eau de Nile green’ conforming to IS:5 Shade 216 on the
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exterior and white on the interior surfaces. The overall height shall
be 2300 mm to match with the height of the existing transformer and
feeder control and relay panels.
7.2 The control panel shall be fabricated from sheet steel of uniform gauge
of at least 10 SWG for front and rear panels, base frame and door
frame, and of at least 14 SWG for side panels, roof and doors. Cable
entries shall be provided from the bottom of the control panel for
which suitable opening shall be provided on the bottom plate. The
control panel shall be suitable for erection flush with the floor by
evenly spaced grouting bolts projecting through the base channel of its
frame. The control panel including the relay housing shall be dust,
vermin and moisture-proof. The overall size of the control panel shall
be subject to the approval of Railways.
There shall be provision for fixing a 240 V incandescent lamp for
interior lightning. The lamp shall be switched ON/OFF with the help of
a door switch mounted at suitable location inside the panel.
The front panel shall have the control switch, indication light emitting
diodes (LEDs), annunciation level, alarm cancellation push button and
a mimic diagram indicating connections of various equipments.
7.3 The protective relays shall be mounted on the rear panel and shall be
of semi-flush mounting type with back connections and provided with
dust-proof covers and test plug or separate test blocks for secondary
injection tests.
7.4 Instrument
A switch-board type, back connected, semi-flush mounted Ammeter
0-200 A of class A industrial grade accuracy, shall be provided for the
indication of capacitor current. All circuits including current coil of the
instrument shall be capable of withstanding 20% overload
continuously. It shall be subjected to a high voltage test of 2 kV rms
for one minute. The instrument shall be provided with dust-tight case
and finished in dull black enamel paint.
7.5 A suitable spring return type control switch with pistol grip handle
having three positions- ON/OFF/Neutral shall be provided on the
control panel. The switch shall have a sequence device to prevent two
successive movements to the same position. Following LEDs shall be
provided for indication of circuit breaker condition:
I Circuit breaker ‘closed’ Red
Ii Circuit breaker ‘open’ Green
Iii Trip circuit of C.B. healthy Yellow
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Low consumption, extra bright, 5 mm dia. Light emitting diodes (LEDs)
shall be used, wherever required. LEDs shall be suitably wired o glow
off 110 V d.c. supply. LEDs shall be housed in suitable holders with
glazed/ polished surface to act as reflector. The holders shall be
screwed to the panel from inside.
7.6 A suitable two position (local/remote) change over switch shall be
provided on the control panel for operation of circuit breaker from
control panel in ‘local’ mode and from Remote Control Centre in
‘Remote’ mode of this switch.
7.7 Mimic diagram
7.7.1 The scheme of connections at the sub-stations showing the isolator,
circuit breaker, series reactor and the capacitor bank shall be
represented by a single line mimic diagram on the control panel.
The colour of the mimic diagram will be golden yellow to shade No.
356 of IS: 5. Automatic semaphore relay shall be provided in the
mimic diagram to indicate ON/OFF position of the circuit breaker.
7.7.2 Open / Close position of the 25 kV isolator shall be represented on
the mimic diagram board by manually operated semaphore
indicator. Push button and yellow indication LED, as mentioned in
clause No. 7.5 above, shall be provided on the control panel to
monitor the healthiness of the trip circuit of the circuit breaker.
7.8 Annunciator
7.8.1 An annunciation level as per sketch at Appendix-VII shall be
provided on the front side of the control panel for visual alarm of
various fault conditions.
7.8.2 The visual alarm shall be of flasher type i.e. concerned LED shall
flicker and will not become stable till the alarm is accepted.
7.8.3 The alarm accepting and annunciation testing buttons shall be
mounted on the control panel at a convenient height under the
annunciator lebel.
7.8.4 Alongwith visual alarm, there shall be provision for an audible
alarm. Audible alarm bell shall work off 110 volts d.c. this bell shall
be mounted inside the control panel. The alarm bell shall
continuously ring when a fault is there and shall not stop ringing till
the alarm is acknowledged. A suitable disconnection switch shall be
provided for disconnection of the bell circuit.
7.9 Remote operation
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7.9.1 The capacitor bank shall normally be switched in or out by control
commands issued by Traction Power controller from the Remote
Control Centre. These telecommands shall be issued with the help of
supervisory Remote Control and Data Acquisition System, hereafter
called SCADA system, provided at Remote Control Centre.
7.9.2 For the purpose of telecommands and telesignalling, suitable
terminals shall be provided on a terminal block, which shall be duly
wired for the following:
i. One telesignal each for supervision of secondary fuse of potential
transformer (P.T.) and residual voltage transformer (RVT).
ii. One telesignal for monitoring the health of capacitor units and
series reactor as recommended by the tenderer.
iii. One telecommand for operation of capacitor circuit breaker.
7.10 Suitable terminal blocks including testing terminal shall be mounted at
a convenient location inside the control panel. The current rating of the
contacts shall be 30 amps. Continuous at 110 V dc. The current
terminals shall be provided with short circuiting links or other suitable
device. The potential terminals shall be housed in a narrow recesses of
the moulded insulation block to prevent accidental short circuit.
Terminals on the blocks shall be stud type for crimpled terminal/lugs,
securely tightened with nuts and spring washers. AC and DC terminals
shall be kept separate. Each terminal shall be completely shrouded.
7.11 All panel wiring shall be done with switch-board type 1100 V grade
PVC insulated single core stranded tinned annealed copper conductor
for service in tropical climate. The wiring shall be flame retardant and
not prone to attach by the vermins, i.e. mice, white ants, cockroaches,
etc.
7.12 Suitable space heaters to operate off 240 V AC single phase, 50 Hz
supply with ‘ON’ and ‘OFF’ switch shall be provided inside the control
panel to prevent condensation of moisture in humid weather.
7.13 One combined three pin switch plug, 5 Amps rating shall be provided
inside the panel for using 240 V hand lamp.
7.14 HRC type cartridge fuses of appropriate rating shall be used in the
control panel at easily accessible places in all potential circuits.
8.0 CURRENT TRANSFORMER AND POTENTIAL TRANSFORMER
Current and potential transformers for the protection of capacitor bank shall
be supplied by the tenderer. Full technical particulars of such transformers
shall be furnished in the tender offer.
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9.0 PROTECTION AGAINST LIGHTNING SURGES
A separate lightning arrestor shall be provided to protect the capacitor bank
against lightning surges. The lightning arrestor shall be metal oxide gapless
type 42 kV class having 10 kA discharge current for V connected System
and 60kV class having 10 kA discharge current for Scott connected system.
The lightning arrestor shall be designed to withstand the full energy
discharge from the capacitor bank to which it is connected.
10.0 EARTHING
Earthing arrangements shall be provided for capacitor bank installation in
accordance with RDSO specification No. ETI/PSI/120(7/88) (02/91) with
A&C Slip No. 1 or latest code of practice for Earthing of power supply
installation for 25 kV, ac 50 Hz, single phase traction system.
11.0 GALVANISING
All steel supporting frame shall be hot-dip galvanized as per Research
Designs & Standards Organisation’s specification no. ETI/OHE/18(4/84)
TI/SPC/OHE/FASTERNERS/0120 Rev. 1 or latest and the weight of zinc
coating shall be not less than 1000 gm/m sq.
12.0 PAINTING:
All steel structures exposed to weather shall be given primer coat of zinc
chromate and two coats of light grey enamel paint to shads No.631 of IS:
5. One additional coat of paint shall be given at site by the manufacturer.
13.0 FASTERNERS
All fasteners of 12 mm diameter and less exposed to atmosphere shall be
of stainless steel and those above 12 mm dia shall be preferably of
stainless steel or mild steel hot dip galvanized to RDSO’s specification No.
ETI/OHE/18(4/84) TI/SPC/OHE/FASTERNERS/0120 Rev. 1 or latest. The
material of the stainless steel fasteners shall conform to IS: 1570 (Pt.V)
Grade 04 Cr 17Ni 12 Mo 2.
14.0 TESTING
14.1 All type and routine tests shall be conducted on the capacitor units,
series reactor, circuit breaker and the complete capacitor bank
installation as per the governing specifications mentioned in clause 2.1.
The tests on all the equipments shall be conducted in the presence of the
purchaser’s representative.
14.2 The following tests shall be carried out at the works of manufacturer or
at a reputed testing laboratory at any Government approved testing
laboratory if testing is done in India on the prototype units of the shunt
capacitor as per IS: 2834 and IEC:70 or latest.
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14.3 BEFORE MANUFACTURE OF PROTOTYPE
The Vendor has to offer drawing & design for approval of RDSO including
Quality Assurance Plan (QAP), Schedule of Guaranteed Performance
(SOGP) and Design Calculations as required and mentioned in the
relevant Clauses of Specification.
Only after all submitted documents have been approved and
clearance given to this effect by RDSO, the manufacturer shall take up
manufacture of the prototype for inspection/testing by RDSO. It is to be
clearly understood that if, there are any changes to be done on the
prototype as required by RDSO, same shall be done expeditiously.
14.4 Before giving the call to Purchaser/DG(TI)/RDSO/ The Chief Electrical
Engineer for inspection and testing of the prototype of the system the
manufacturer shall submit a detailed test schedule of proto type testing
indicating the name of the test with internal test report (Test report of
Routine Test) consisting of schematic circuit diagrams for each of the
tests and nature of the test, venue of the test and the duration of each
test and the total number of days required to complete the test at one
stretch. Once the schedule is approved, the test shall invariably be done
accordingly.
However, during the process of type testing or even
later, RDSO representative reserves the right to conduct any additional
tests besides those specified herein, or any equipment/ sub-system or
system so as to test the system to his satisfaction or for gaining
additional information and knowledge. In case any dispute or
disagreement arises between the manufacturer and authorized
representative of the purchaser/DG (TI)/RDSO, Lucknow RDSO/ The
Chief Electrical Engineer during the process of testing as regards the
type tests and /or the interpretation and acceptability of the type test
results, it shall be brought to the notice of the Director General (Traction
Installations), RDSO, Lucknow/ the Chief Electrical Engineer as the case
may be, whose decision shall be final and binding. Only after the
prototype of the equipment is manufactured and ready in all respects,
shall the Vendor/manufacturer give the actual call for the inspection and
testing with at least 15 days‟ notice for the purpose.
14.5 Type test shall be carried out on Prototype unit of Shunt Capacitor Bank
with relevant standards as modified or amplified by this specification
where applicable at the works of the manufacturer or at any Government
approved testing laboratory if testing is done in India. At the works of
the manufacturer the testing shall be conducted in the presence of the
authorized representative of the purchaser/DG (TI)/RDSO, Lucknow.
However for the tests in the any Government approved testing
laboratory if testing is done in India, the presence of representative of
the purchaser/DG (TI)/RDSO, Lucknow may be decided by the RDSO,
inspection and testing with at least 15 days‟ notice for the purpose.
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14.6 For the tests which are conducted in the laboratories of Central Power
Research Institute (CPRI), Electrical Research Development
Association (ERDA) or any such testing house or laboratory a clear
certificate to the effect that the equipment has passed the tests as per
the Specification shall be obtained by the manufacturer and submitted
to the Purchaser/DG (TI)/RDSO, Lucknow. Full details of the tests and
the test parameters shall be furnished along with the test reports.
These test reports shall be considered for acceptance, provided there
is no any design change between already tested material and offered
material.
In any case, the prototype tests, which can be conducted in-
house at manufacturer’s works shall be required to be carried out and
witnessed by RDSO during initial approval.
14.7 TYPE TESTS ON SHUNT CAPACITOR:
13.3.1 Type tests shall be conducted on the first prototype unit
manufactured after all the design and drawings have been
approved and clearance given by RDSO to this effect.
13.3.2 Before giving the call to RDSO/ The Chief Electrical Engineer for
inspection and testing of the prototype of the system the
manufacturer shall submit a detailed test schedule of proto type
testing indicating the name of the test with internal test report
(Test report of Routine Test) consisting of schematic circuit
diagrams for each of the tests and nature of the test, venue of the
test and the duration of each test and the total number of days
required to complete the test at one stretch. Once the schedule is
approved, the test shall invariably be done accordingly.
However, during the process of type testing or
even later, RDSO representative reserves the right to conduct any
additional tests besides those specified herein, or any equipment/
sub-system or system so as to test the system to his satisfaction
or for gaining additional information and knowledge. In case any
dispute or disagreement arises between the manufacturer and
authorized representative of the purchaser/DG (TI)/RDSO,
Lucknow RDSO/ The Chief Electrical Engineer during the process
of testing as regards the type tests and /or the interpretation and
acceptability of the type test results, it shall be brought to the
notice of the Director General (Traction Installations), RDSO,
Lucknow/ the Chief Electrical Engineer as the case may be, whose
decision shall be final and binding. Only after the prototype of the
equipment is manufactured and ready in all respects, shall the
Vendor/manufacturer give the actual call for the inspection and
testing with at least 15 days‟ notice for the purpose.
The following Type Test carried out on Shunt capacitor:
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SN Description of the Test Refer Clause
i. Test for output and capacitance measurement. 14.7.1
ii. Voltage test between terminals. 14.7.2
iii. Thermal stability test. 14.7.3
iv. Tangent pf dielectric loss angle at elevated
temperature. Measurement of the tangent of the loss angle (tan δ) of the capacitor at elevated
temperature.
14.7.4
v. AC Voltage test between terminals and container (for
Capacitor unit).
14.7.5
vi. Measurement of tangent dielectric of the loss angle
(tan δ) of the capacitor.
14.7.6
vii. Lightning Impulse voltage test between terminals and
container.
14.7.7
viii. Partial discharge Test 14.7.8
ix. Capacitor Short circuit discharge test. 14.7.9
x. Endurance Testing 14.7.10
xi. Tests on internal Fuses. a. Discharge test on internal fuses.
b. Disconnecting test on internal fuses.
14.7.11
xii. Test of internal discharge device. 14.7.12
xiii. Sealing test. 14.7.13
xiv. Special tests on capacitor units with internal fuses 14.8.14
14.7.1 Test for output and capacitance measurement:
The output of the capacitor shall be determined in accordance with
Appendix-F of IS: 2834 or latest and shall be within-5 to + 10% of
the rated value of capacitor units for making capacitor banks but
within -0 to 10 % of the rated value in case of capacitor banks. The
test shall be carried out as per clause No. 7 of IS: 13925-1 or
latest.
14.7.2 Voltage Test between Terminals:
This test shall be carried out as per clause No. 9 of IS: 13925-1 or
latest.
14.7.3 Thermal Stability Test:
This test shall provide thermal stability to capacitor under overload
conditions and prepare the capacitor to give reliable loss
measurements. The test shall be carried out as per clause No. 15
13 of IS: 2834 13925-1 or latest.
14.7.4 Tangent pf dielectric loss angle at elevated temperature
Measurement of the tangent of the loss angle (tan δ) of the
capacitor at elevated temperature:
The dielectric loss angle (tan delta) shall be measured at a
temperature of 70 degree C or as attained in thermal stability test.
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The measuring voltage shall be same as in thermal stability test.
This test shall be carried out as per clause No. 14 of IS: 13925-1 or
latest.
14.7.5 AC Voltage test between terminals and container (for capacitor
units):
An AC test voltage shall be carried out as per clause No. 15 of IS:
13925-1 or latest. The voltage of the value specified in Col.2 of
Table-3 of IS:2834 shall be applied between the terminals (short
circuited) of each capacitor unit and its container, and maintained
for a period of one minute, except that when one terminal of the
capacitor is connected to the container.
14.7.6 Measurement of tangent dielectric of the loss angle (tan δ) of the
capacitor:
The dielectric loss angle (tan delta) shall be determined by means
of Schering Bridge or other method capable of giving sufficiently
accurate results. The measurements shall be carried out as per
Clause no. 14 8 of IS: 2834 13925-1 or latest.
14.7.7 Lightning Impulse voltage test between terminals and container:
Five impulse wages of 1.2/50 micro-second, of each polarity having
a peak value corresponding to the insulation level of the unit shall
be applied between the terminals (joined together) and the
container. The test shall be carried out as per Clause No. 18 16 of
IS: 2834 13925-1or latest.
14.7.8 Partial discharge test:
The test shall be carried out as per clause No. 17 of IS: 2834 or
latest.
14.7.9 Capacitor Short Circuit discharge test:
The capacitor shall be charged by means of dc voltage equal to
twice 2.5 times of the r.m.s value of the rated voltage of the unit
and discharged through a gap situated as close as possible to the
capacitor as per clause No. 21 17 of IS: 2834 13925-1 or latest.
14.7.10 Endurance testing
Capacitor units shall be subjected to an endurance test by the
manufacturer of the capacitors to ascertain that repeated over
voltages stresses do not cause dielectric break down. This test shall
be done in accordance with procedure laid down in IEC: Report
871—2:1987 60871-2 or latest. In case it is not possible to carry
out the test in accordance with IEC report 871-2:1987 or latest, the
capacitor units shall be tested for endurance in accordance with an
alternative procedure which shall be mutually agreed to between
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the manufacturer and the purchaser and repeated if any changes
will be made in design.
14.7.11 Test on Internal Fuses:
The following type tests shall be carried out on the internal fuses
as per IS: 12672 or latest:
a. Discharge test on internal fuses (Clause no. 9 of IS: 12672) :
The fuses shall be subjected to live Five discharges within 10
minutes from a dc test voltage equal to 2.5 times the rms value of
the rated voltage of the capacitor element through a gap situated
as clause as possible to the capacitor without any additional
impedance in the circuit. To prove that the fuses have not
operated, a capacitance measurement shall be made before and
after the test.
b. Disconnecting test on Internal fuses (Clause no. 10 of IS:
12672):
The disconnecting test on fuses shall be performed first at lower
voltage limit equal to 0.9 times rms value of the rated voltage of
the capacitor element and then as soon as possible after blowing
of one fuse at the upper voltage limit equal to 2.2 times the rms
value of rated voltage of the capacitor element until blowing of
another fuse. After the test, Capacitance shall be measured to
prove that the fuse(s) has (have) blown. A measuring method
shall be used that is sufficiently sensitive to detect the capacitance
change caused by the blown fuse.
14.7.12 Test of internal discharge device:
This test shall be carried out as per clause no. 11 of IS: 13925-1
or latest.
14.7.13 Sealing Test:
A sealing test shall be carried out to demonstrate that the
impregnated does not leak from the capacitor. The test shall be
carried out at 80+/- 5 degree C for a period of 3 hours.
14.7.14 Special tests on capacitor units with internal fuses.
i. High voltage discharge test;
Each capacitor unit manufactured shall be tested strictly in
accordance with the IS: 2834-1986 13925-1 or latest. The
special discharge test shall be performed to check the
mechanical strength of internal fuses and discharge resistors.
The internal element fuses shall be routine tested together with
the capacitor units as per the diagram given below:
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1. Low voltage capacitance measurement.
2. DC Voltage test (4.3 Vn 10
sec.) 3. Direct discharge from 1.7
Vn. 4. Low voltage capacitance
measurement.
5. Capacitance and loss measurement (Vn)
(Vn=rated voltage of
capacitor)
14.8 Routine tests:
The following tests shall be carried out as routine tests and shall be
carried out on each and every units of the shunt capacitor as per IS:
13925-1 or latest.
SN Description of the Test Refer
Clause
i. Visual Examination 14.8.1
ii. Test for output and capacitance measurement. 14.8.2
iii. Measurement of tangent dielectric of the loss angle
(tan δ) of the capacitor.
14.8.3
iv. Voltage test between terminals. 14.8.4
v. AC Voltage test between terminals and container 14.8.5
vi. Test for efficacy of discharge device Test of internal
discharge device.
14.8.6
vii. Sealing test. 14.8.7
viii. Discharge test on internal fuses 14.8.8
ix. Insulation resistance test 14.8.9
14.8.1 Visual Examination:
All capacitors shall be examined for finish and marking. Verification
of dimension shall also be done as per approved drawings.
14.8.2 Test for output and capacitance measurement:
This test shall be carried out in accordance with clause 13 7 of IS:
2834 13925-1 or latest.
14.8.3 Measurement of tangent of dielectric the loss angle (tan δ) of the
capacitor.
This test shall be carried out in accordance with clause No. 14 8 of
IS: 2834 13925-1 or latest.
14.8.4 Voltage test between terminals:
This test shall be carried out as per clause No. 9 of IS: 13925-1 or
latest.
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14.8.5 AC Voltage test between terminals and container:
An AC test voltage shall be carried out as per clause No. 15 of IS:
13925-1 or latest.
14.8.6 Test for efficacy of discharge device Test of internal discharge
device:
A test for verifying the requirements of discharge device, as given
in clause 6.1.1 to 5.1.3 of IS: 2834 or latest, shall be made.
Method of test for efficacy of discharge device shall be as per
Appendix-G of IS: 2834 or latest. This test shall be carried out as
per clause no. 11 of IS: 13925-1 or latest.
14.8.7 Sealing test:
A sealing test shall be carried out to demonstrate that the
impregnated does not leak from the capacitor. The test shall be
carried out at 80+/- 5 degree C for a period of 3 hours.
14.8.8 Discharge test on internal fuses (Clause no. 9 of IS: 12672):
The fuses shall be subjected to live Five discharges within 10
minutes from a dc test voltage equal to 2.5 times the rms value of
the rated voltage of the capacitor element through a gap situated
as clause as possible to the capacitor without any additional
impedance in the circuit. To prove that the fuses have not
operated, a capacitance measurement shall be made before and
after the test.
14.8.9 Insulation resistance test:
Every capacitor shall be subjected to an insulation test between
terminals and container except when the terminal of the capacitor
is connected to the container. The test shall be made with a dc
voltage (megger) not less than 500 volts. The insulation resistance
so determine shall not be less than 50 mega ohms.
14.9 Acceptance Tests:
The routine and/or type tests or some of them, may be repeated by
the Purchaser by mutual agreement between the purchaser and the
manufacturer, however, following tests shall be carried out in the
sequence given below:
i. Visual Examination:
All capacitors shall be examined for finish and marking verification
of the dimension shall also be done as per approved drawing.
ii. Sealing tests:
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This test shall be carried out in accordance with clause No. 22 of
IS: 2834 or latest.
iii. Insulation Resistance Test:
This test shall be carried out in accordance with clause no. 12 of
IS: 2834 or latest.
iv. Test for efficacy of discharge device;
This test shall be carried out in accordance with clause No. 19 of
IS: 2834 or latest.
v. Measurement of tangent of dielectric loss angle.
This test shall be carried out in accordance with clause No. 14 of
IS: 2834 or latest.
14.10 TYPE TEST ON SERIES REACTOR:
The following type tests shall be carried out on the prototype units as
per IS: 2026 (part 6) or IEC 60076-6 or latest:
SN Description of the Test Refer
Clause
i. Measurement of winding resistance 14.10.1
ii. Measurement of insulation resistance 14.10.2
iii. Measurement of Impedance at Rated continuous
current.
14.10.3
iv. Measurement of loss and Q-factor at ambient
Temperature
14.10.4
v. Separate source voltage withstand test 14.10.5
vi. Temperature rise test at rated continuous current 14.10.6
vii. Lightning Impulse voltage withstand test 14.10.7
viii. Short Circuit Test 14.10.8
ix. Winding overvoltage Test 14.10.9
x. Wet winding overvoltage test 14.10.10
xi. Wet separate source A.C. withstand Voltage Test 14.10.11
14.10.1 Measurement of winding resistance:
This test shall be carried out in accordance with clause No. 10.2
of IS: 2026-1:2011 or clause no. 11.2 of IEC 60076-1:2011 or
latest.
14.10.2 Measurement of insulation resistance:
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The measurement of insulation resistance of the winding
insulation to earth shall be carried out with 500V Insulation
Resistance Tester.
14.10.3 Measurement of Impedance at Rated continuous current:
This test shall be carried out in accordance with Clause No. 8.9.5
of IS: 2026-6: 2017 or latest.
14.10.4 Measurement of loss and Q-factor at ambient Temperature:
This test shall be carried out in accordance with clause No. 9.10.6
of IS: 2026-6: 2017 or latest.
14.10.5 Separate source voltage withstand test:
This test shall be carried out in accordance with clause no. 8.9.8 of
IS: 2026-6: 2017 or latest by applying specified voltage for one
minute between
a) The winding and the earth and
b) The windings of different phases.
14.10.6 Temperature rise test at rated continuous current:
This test shall be carried out in accordance with Clause No. 8.9.11
of IS: 2026-6: 2017 or latest.
14.10.7 Lightning Impulse voltage withstand test:
This test shall be carried out in accordance with Clause No. 9.10.9
of IS: 2026-6: 2017 or latest.
14.10.8 Short circuit test
This test shall consist of application to the reactor of two short
circuits with specified initial peak current for 10 cycles as per
clause no. 3.5 and 8.11 8.9.13 and 9.10.10 of IS: 5553 (Part-II)
2026 -6: 2017 or latest.
14.10.9 Winding overvoltage Test:
This test shall be carried out in accordance with Clause No. 8.9.9
and 9.10.7 of IS: 2026-6: 2017 or latest.
14.10.10 Wet winding overvoltage test:
This test shall be carried out in accordance with Clause No. 8.9.19
of IS: 2026-6: 2017 or latest.
14.10.11 Wet separate source A.C. withstand Voltage Test:
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This test shall be carried out in accordance with Clause No. 8.9.20
of IS: 2026-6: 2017 or latest.
14.11 Routine tests:
The following tests shall be carried out as routine tests on each and
every units of the Reactor as per IS: 2026-6: 2017 or latest.
SN Description of the Test Refer Clause
i. Measurement of winding resistance 14.11.1
ii. Measurement of insulation resistance 14.11.2
iii. Measurement of Impedance at rated continuous current.
14.11.3
iv. Measurement of load losses loss and Q-factor at ambient Temperature
14.11.4
v. Separate source voltage withstand test 14.11.5
vi. Induced over voltage withstand test or Lightning
Impulse voltage withstand test
14.11.7
vii. Winding overvoltage Test 14.11.8
14.11.1 Measurement of winding resistance:
This test shall be carried out in accordance with Clause No. 10.2 of
IS: 2026-1:2011 or Clause no. 11.2 of IEC 60076-1:2011 or
latest.
14.11.2 Measurement of insulation resistance:
This test shall be carried out in accordance with IS: 2026. The
measurement of insulation resistance of the winding insulation to
earth shall be carried out with 500V Insulation Resistance Tester.
14.11.3 Measurement of impedance at rated continuous current:
This test shall be carried out in accordance with clause No. 8.4
8.9.5 of IS: 5553 2026-6:2017 or latest.
14.11.4 Measurement of load losses loss and Q-factor at ambient
Temperature:
This test shall be carried out in accordance with clause No. 8.5
9.10.6 of IS: 5553 2026-6:2017 or latest.
14.11.5 Separate source voltage withstand test:
This test shall be carried out in accordance with clause no. 8.9.8 of
IS: 2026-6: 2017 or latest by applying specified voltage for one
minute between
c) The winding and the earth and
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d) The windings of different phases.
14.11.6 Induced overvoltage withstand test or Lightning impulse voltage
withstand test:
This test shall be carried out in accordance with Clause no. 9.10.9
of IS: 2026-6:2017 or latest.
14.11.7 Winding overvoltage Test:
This test shall be carried out in accordance with Clause No. 8.9.9
and 9.10.7 of IS: 2026-6: 2017 or latest.
14.12 Test on control panel
Following checks and tests shall be carried out on the control panel:
i. Visual checks
General check of control board in respect of construction of
wiring, provision of various equipments and relays.
ii. Operation tests
Operation tests on all the equipments, switches and tests to
prove correctness of wiring of various circuits including
indications, alarms, operation of relays and annunciation.
iii. Power frequency high voltage withstand test.
Voltage test on the panel with all equipments and wiring for
a withstand voltage of 2000 V (rms) to earth for one minute.
iv. Insulation resistance tests
Measurement of insulation resistance of the complete panel
wiring, circuit by circuit, by using 1000 v megger.
14.13 Following tests shall be conducted at site to verify the performance of
the complete capacitor bank installation:
i. Tests for efficacy of discharge device:
Tests for verifying the requirements of discharge deice as given in
clauses 6.1.1 to 6.1.6 of IS: 2834 or latest.
ii. Test on protection system:
This test shall be carried out by a simulating the fault conditions
and observing the relay operation.
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iii. Rise in voltage due to capacitor bank connection:
At different loads, the voltage at the 55kV or 25 kV busbar shall
be recorded for 24 hours each with and without the capacitor
bank. The rise in voltage due to the capacitor bank shall be
assessed from these observations.
iv. Harmonic analysis:
The harmonic analysis of current and voltage waveform shall be
carried out by the tenderer with and without capacitor bank in
circuit.
v. Surge voltage measurement:
The surge voltage shall be measured by the tenderer at the time
of switching in capacitor bank. This shall be done for 20 times;
the voltage peak shall not exceed 70 kVp in any case for V-
Connected System and 150 kVp in any case for Scott Connected
Transformer.
14.14 Schedule of pre-commissioning tests:
14.13.1 The schedule of pre-commissioning tests on the capacitor units,
reactor and the complete bank, control & relay panels, circuit
breakers and other items shall be mutually agreed upon by the
successful tenderer vendor and the purchaser.
14.13.2 The HT capacitor unit and series reactor shall be inspected by OEM
before being commissioned. A certificate to this extent that the
installation is fit for commissioning shall be taken from the Original
Equipment Manufacturers.
14.15 Bulk manufacture of the shunt capacitor shall be taken up only after
specific written approval given by the purchaser to the successful
tenderer vendor on the basis of the tests conducted on the proto type
units manufactured according to approved design and drawings.
15.0 Capitalization of Losses:
15.1 In evaluating the offer, the price of the capacitors and series reactors
with higher watt losses per/ kVAr shall be compared by increasing the
prices by capitalization of additional losses by the formula given in the
appendix- IV. The tenderer Vendor shall for this purpose clearly
indicate the losses in watts per kVAr rating of the capacitor bank and
separately for the series reactor at the rated voltage.
15.2 The losses of the capacitor bank shall be made up of the losses per
capacitor unit (including fuses and discharge device) multiplied by the
number of units in the bank. The overall losses of a capacitor unit shall
be as low as possible and shall not be more than 0.25 W/kVAr.
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16.0 Technical Data and Drawings:
16.1 The tenderer vendor shall furnish guaranteed performance data,
technical and other particulars for the equipments offered in the
Performa at Annexure-A. Technical details of the protection employed
together with detailed calculation for the ratings of the equipment shall
be furnished with the tender.
16.2 The information furnished in schedule of the guaranteed performance,
technical and other particulars (Annexure-A) shall be complete in all
respects. If there is any entry like: “shall be furnished later” or blanks
are left against an item, the tender is not likely to be considered as
such omissions causes delay in finalizing the tender.
16.3 The tenderer vendor shall specifically indicate in a statement attached
with his offer, his compliance with each clause and sub-clause of this
specification. If any vague remarks on any clause or sub-clause of this
specification is given by the tenderer, then the tender submitted by
him is not likely to be considered. A separate deviation statement shall
be furnished with the offer drawing to the clause (s) where the
tenderer seeks the deviation giving detailed remarks/ justification
thereon. If there are no deviation, a ’NIL’ statement shall be furnished.
16.4 The tenderer vendor shall furnish the following calculations with their
offer.
i. Detailed calculations for rating of shunt capacitor bank series
reactor, inrush current, transient over voltage, parallel and series
resonant frequencies.
ii. Calculations for protection scheme offered
iii. Calculations for design of supporting frame, fixing arrangement
and foundation.
16.5 The following drawings shall be furnished as per IR standard in sizes of
210 mm x 290 mm or any integral multiple thereof:
a. Outline general arrangement drawing giving the overall
dimensions of the capacitor bank installation.
b. Arrangement of capacitor Bank, Series reactor, circuit breaker,
isolator, lightening arrestor, current and potential transformers.
c. Details of capacitor bank showing series parallel arrangement of
capacitor units.
d. Arrangement of core winding and magnetic path of series reactor.
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16.6 The successful tenderer vendor shall be required to submit for
approval the following detailed dimensioned drawings as per Indian
Railway Standard in the sizes of 210 mm x 297mm or any integral
multiple thereof.
a. Outline general arrangement drawing of the capacitor bank
installation indicating necessary dimensions, clearances and
location of equipments/ fittings (all the 3 views), Name and
noting plate with diagram of connections (one in English and
other in Hindi).
b. Internal arrangement of series reactor including cross sectional
views in both plane and elevation.
c. Schematic and wiring diagram.
d. Supporting frame with details of fixing arrangement and
foundations alongwith calculation for their design.
16.7 After approval of designs and drawings by Director General/TI, RDSO,
Lucknow, the tenderer vendor shall manufacture an acceptable
prototype of shunt capacitor equipment as per approved drawings. The
prototype inspection shall be carried out by the representative of
RDSO. The bulk manufacture shall be taken up only after approval of
prototype by the Director General (TI), RDSO, Lucknow.
16.8 Routine Inspection shall be carried out, by the representatives of
Indian Railways at the manufacturer’s works.
16.9 After approval, 6 copies of approved drawings alongwith two sets of
reproducible prints shall be supplied to each consignee(s). Besides,
two copies of drawing alongwith one set of reproducible prints shall be
supplied to Director General (TI), RDSO, Lucknow. One sets of
approved drawings of hard copies, shall be sent to RDSO for record.
16.10 The successful tenderer vendor shall supply 10 copies of
instructions/maintenance manual for the capacitor bank installation
and its fittings and accessories, to each consignee(s) and two copies to
Director General (TI), RDSO, Lucknow.
17.0 Erection Testing and Commissioning:
The capacitor bank installation shall be erected by the successful tenderer
vendor under the supervision of a competent engineer of the successful
tenderer vendor/manufacturer/ supplier. The capacitor bank installation
shall be subjected to the specified proving / pre commissioning tests by
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the Railway Engineer at site and with which the successful tenderer
vendor/ manufacturer/ supplier shall also be associated. For this purpose
prior intimation regarding the date and location of the tests shall be given
by the purchaser to the successful tenderer vendor/ manufacturer/
supplier.
18.0 SPARES
The tenderer vendor shall furnish alongwith his offer a list of spares, with
cost, recommended by him for maintenance of capacitor bank installation
for a period of 2 5 years.
19.0 TRAINING OF INDIAN RAILWAYS’ ENGINEERS
The offer shall include the training of two engineers and four technicians of
the Indian Railways free of cost at the manufacturer’s works in India or
abroad and at the traction sub-station of a railway system or other public
utility where capacitor bank installations of similar/ identical design are in
operation. The total duration of training for each engineer/ technician
shall be 4 weeks of which approximately 2 weeks will be a the
manufacturer’s works and 2 weeks on a railway system or other public
utility. The cost of travel to the country of manufacture and back will be
borne by the Indian Railways. Other details shall be settled at the time of
finalizing the contract or purchase order.
20.0 WARRANTY
Each capacitor bank including all equipment supplied against a purchase
order/ contract in which this specification is quoted, irrespective of origin
(imported or indigenous), shall be guaranteed for trouble free and
satisfactory performance for a period of 24 42 months from the date of
supply or 18 36 months from the date of commissioning at the sub-station
on the Indian Railways, whichever period is shorter. Details of warranty
clause, the extent of responsibility and other relevant aspects shall be
included in the purchase order or contract. The tenderer vendor shall
furnish detailed terms and conditions in this regard in his offer.
The successful tenderer vendor shall make necessary arrangement for
closely monitoring the performance of the capacitor bank installation
through periodical visits (preferably once in two months during the
warranty period) to the sub-station for on-the-spot detailed observations.
Arrangements shall be also be made for spare parts to be kept readily
available with the successful tenderer vendor / manufacturer/ supplier to
meet exigencies warranting replacement so as to put back the capacitor
bank installation in service without unduly long interruptions.
*********
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Annexure to Specification No. ETI/PSI/126(8/89)
SCHEDULE OF GUARANTEED PERFORMANCE TECHNICAL AND OTHER
PARTICULARS.
A- Capacitor Unit
S. N. Description Unit of measurement
1. Maker’s Name
2. Country of manufacture
3. Manufacturer’s type designation
4. Location of capacitor bank ( outdoor/indoor)
5. System voltage kV
6. Rated voltage of unit as per IS: 2834 13925-1 or latest
kV
7. Maximum voltage (rms) which the capacitor unit can withstand continuously
kV
8. Rated frequency Hz
9. No. of phases No.
10. Upper limit of temperature category Deg. C
11. Capacity of individual unit at rated voltage of unit
KVAr
12. Capacity of capacitor bank at 55kV or 25 kV kVAr.
13. Continuous current Maximum inrush current at the instant of
switching in
Amps Amps
14. Basic insulation level of unit
a) Power frequency voltage withstand b) 1.2/50 microsecond impulse withstand
voltage
KV(rms) kV(peak)
15. Basic insulation level of complete capacitor
bank. a) Power frequency voltage withstand b) 1.2/50 microsecond impulse withstand
voltage
Kv(rms) Kv(peak)
16. Transient current withstand capacity kA
17. Constructional details of capacitor unit. i) Dielectric material
ii) Foil material iii) Impregnating liquid used and its
properties. iv) Discharge resistors. v) Internal fuses.
18. Dielectric loss per kVAr / unit at 55kV or 25 kV and 50 C/s
watts
19. Capacitor unit- i) No. of elements in series
ii) No. of elements in parallel iii) Capacitance of each unit
No.
No. Micro Farad
20. Capacitor bank i) Capacitance of bank
ii) No. of series groups
Micro Farad
No.
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iii) No. of parallel units in each group No.
21. a) Internal fuse
i) Type of internal fuse elements of capacitor unit:
ii) Length of fuse element
iii) Cross section of fuse element iv) circumstance of fuse element
v) It characteristics. vi) Time factor (s) of internal fuse element
b) External fuse:
i) Type of fuse on individual capacitor unit. ii) Rating of the fuse. iii) Reference to time/ current characteristics
of the fuse used.
mm
Sq.mm Mm
Sec. (under max. energy
condition)
Sec. (under min energy condition.)
22. Discharge device.
i) Type ii) Location
iii) Time interval between de-energisation and re-energisation
iv) Residual voltage after an interval of 5
minutes of de-energisation
Minutes
Volts
23. Bushings:
i) Maker’s name ii) Governing Specification
iii) Wet-1 minute power frequency voltage withstand
iv) Impulse voltage withstand 1.2/50
microsecond full wave. v) Creepage distance in air
vi) No. of bushings in each unit
KV(rms) kV(peak)
mm
No.
24. Overall dimensions
i) Capacitor unit ii) Complete capacitor bank
25. Weight per unit Kg
26. Weight of the complete bank Kg
B- Control AND RELAY PANEL
1. Name of manufacturer and address
2. Overall dimensions and weight L-
W- H- Weight
Mm
Mm Mm Kg
3. i. Colour of the panel ii. Colour of the mimic
4. Details of switches provided and their make
5. Annunciations provided
6. Size of wires used for:
i. Control circuit.
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ii. Indication circuit iii. General wiring.
iv. Potential and current transformer circuits. v. Heating circuit. vi. Light circuit.
7. Method of cable entry
8. Details of instruments, if any, provided
C- PROTECTIVE FOR CAPACITOR BANK
1. Over-current protection i) Type and make of relays offered ii) Setting range of current available
2. Over-current protection i) Type and make of relay offered.
ii) Setting range available
3. Unbalance protection
i) Setting range available on current/ voltage operated relay.
ii) Calculations to show overvoltage on other capacitor units due to successive element failures.
iii) Details type and make and setting range of current operated relay.
iv) Values of unbalance currents at which alarm & trip signals shall be given.
4. Under voltage protection i) Type and make of relay used. ii) Resetting ratio of the under voltage
relay. iii) Type and make of the time delay relay.
iv) Setting range of the under voltage relay. v) Setting range of the time delay relay.
Note: - The tender should be complete with three sets (one with each copy) of technical literature and pamphlets of the relays used.
D- SERIES REACTOR
1. Rated current and voltage Amps/ Volts
2. Rated frequency Hz.
3. Inductance of series reactor H
4. Rated impedance Ohms
5. Parallel & Series resonant frequencies of the
system
Hz( parallel)
Hz( Series
6. Value of the peak surge voltage generated at
the time of switching in of shunt capacitor ( calculations shall be appended )
kV
7. Short circuit rating for 3 seconds KA
8. Overall dimensions of the series reactor Mm
9. Total weight of the series reactor Kg
10. Maximum temperature rise: a) At continuous current b) At 130 % loading
Deg. C Deg. C
11. Basic insulation level: a) Power frequency voltage withstand
b) 1.2/50 micro-second impulse voltage
KV (rms)
KV (peak)
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withstand
E- INSTRUMENT TRANSFORMER
i. CURRENT TRANSFORMERS
1. Name of the manufacturer
2. Standard governing specification
3. Nominal system voltage kV
4. Rated burden VA
5. Rated secondary current A
6. Rated transformation ratio
7. Accuracy class
8. rated accuracy limit factor
9. Current error at rated primary current %
10. Phase displacement at rated primary current Minute
11. Composite error at the rated accuracy limit
primary current
%
12. Rated short time thermal current for one
second.
KA(rms)
13. Temperature rise with rated load and with
specified overload: a) Of oil by thermometer b) Of winding by reisistance (secondary)
Deg. C Deg. C
14. Overall dimensions of CT: Height
Length Breadth
Mm
Mm mm
15. Total weight of CT kg
16. a) Is the CT of sealed construction with
nitrogen gas at the top? b) Pressure or amount Nitrogen gas.
ii. POTENTIAL TRANSFORMER
1. Name of the manufacturer
2. Rated system voltage kV
3. Rated burden VA
4. a) Rated primary/ secondary voltage b) Transformation ratio
kV/Volt
5. Accuracy class as per: a) IS: 3156 (Pt. II)-1978
b) IS: 3156 ( Pt. III)-1978
6. Rated voltage factor
7. Maximum temperature rise after continuous full load operation:
a) Oil by thermometer b) Winding by resistance.
Degree Degree
8. Weight and dimensions a) Overall dimensions Height
Length Width
b) Total weight of potential transformer with oil
Mm
Mm Mm
Kg
9. Whether the PT is of sealed construction with nitrogen at top
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Appendix-I
(a) Principle of AT Feeding System.
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Appendix-II
367323/2021/O/o PED/TI/RDSO583
Effective From
Draft spec No. TI/SPC/PSI/FC&SR/1210 Page 44 of 48
Appendix-III
Constitution of shunt Capacitor
367323/2021/O/o PED/TI/RDSO584
Effective From
Draft spec No. TI/SPC/PSI/FC&SR/1210 Page 45 of 48
Schematic Diagram of Shunt Capacitor Bank
367323/2021/O/o PED/TI/RDSO585
Effective From
Draft spec No. TI/SPC/PSI/FC&SR/1210 Page 46 of 48
APPENDIX-IV
(Referred to Clause 15.0)
Formula:
K = Present worth in Rupee
D = Annual cost of power losses
i = Rate of compound interest on unit basis @ 7% per annum.
n = Expected service life of capacitor bank in years.
PL = Power losses
T = Tariff i.e. cost of energy in Rupee per kwh.
The capitalized values for capacitor bank shall be computed as under:
K = D {(1 + i)n - 1}
i (1 + i)n
Where, D per watt = 365 x 24 x T
1000
= 8.76 T
thus K = 8.76 T x (1 + i)n - 1
i (1 + i)n
Hence the capitalized value in Rupees for power losses = K x PL
367323/2021/O/o PED/TI/RDSO586
Effective From
Draft spec No. TI/SPC/PSI/FC&SR/1210 Page 47 of 48
Schematic Diagram of Scott Connected Traction Substation
367323/2021/O/o PED/TI/RDSO587
Effective From
Draft spec No. TI/SPC/PSI/FC&SR/1210 Page 48 of 48
Schematic diagram of V-connected Traction Transformer
367323/2021/O/o PED/TI/RDSO588
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