CTR FIRE SYSTEMS DIVISION POONA

DETAILS OF DRAWINGS FOR APPROVAL OF FIRE PREVENTION AND EXTINGUISHING SYSTEM BY NITROGEN INJECTION METHOD FOR 2 x 315MVA, 400/138/34.5 kV

AUTO TRANSFORMER FOR CROMPTON GREAVES LIMITED, MUMBAI A/C TATA STEEL LTD.JAMSHEDPUR (W.O.NO. T09849) (CONSULTANT: TATA CONSULTING ENGINEERS LIMITED)

SR. NR.

DRAWING NUMBER

TITLE REMARKS

1 FS 3743 A3 01 DETAILS OF INTERCONNECTION DIAGRAM OF PNT FIRE SYSTEM 220 VDC FOR CGL A/C TATA STEEL LIMITED

2 FS 1940 A4 01 DETAILS OF CONTROL BOX OF PNT FIRE SYSTEM 220 VDC

3 FS 1935 A4 01 DETAILS OF FIRE EXTINGUISHING CUBICLE OF PNTMXXXC20 FIRE SYSTEM

4 FS 1936 A4 01 DETAILS OF CUBICLE OF PNTMXXXC20 FIRE SYSTEM

5 FS 1957 A4 00 DETAILS OF VALVE POSITION WITH PRESSURE SWITCH IN F.E.C. OF PNT FIRE SYSTEM

6 FS 1960 A4 04 DETAILS OF PNRV (TCIV)AND MOUNTING FLANGES FOR PNRV (TCIV)OF PNT FIRE SYSTEM

7 FS 1961 A4 00 DETAILS OF WORKING OF PRE-STRESSED NON RETURN VALVE OF PNT FIRE SYSTEM

8 FS 1939 A4 02 DETAILS OF `T’ TYPE FIRE DETECTOR OF PNT FIRE SYSTEM

9 FS 1934 A4 01 DETAILS OF PLINTH FOR FIRE EXTINGUISHING CUBICLE OF PNTMXXXC20 FIRE SYSTEM

10 FS 1966 A3 02 DETAILS OF LOGIC DIAGRAM FOR OPERATION OF PNT FIRE SYSTEM

11 FS 1946 A3 02 DETAILS OF OIL PIT FOR PNT FIRE SYSTEM

12 FS 2527 A4 01 DETAILS OF SCHEMATIC CONTROL DIAGRAM OF PNT FIRE SYSTEM FOR PNT FIRE SYSTEM FOR 220 VDC

13 --- GUARANTEED TECHNICAL PARTICULARS

14 --- FUNCTIONAL DISCRIPTION

15 --- BILL OF MATERIAL FOR SYSTEM

16 FS 3791 A3 00 DETAILS OF WIRING DIAGRAM FOR CONTROL BOX OF PNT FIRE SYSTEM 220 VDC FOR CGL A/C TATA

17 FS 3792 A4 00 DETAILS OF ELECTRICAL WIRING CONNECTION, 220 VDC FOR CGL A/C TATA

TURNOVER

FOR REFERENCE :

1 --- SEQUENTIAL OPERATION OF PNT FIRE SYSTEM

PREPARED BY:OFA (FS4)

CHECKED BY:SAPM(FS)

APPROVED BY:VP3

CC:MKM(FS) —- 1 SET + 1 SOFT COPY FOR CUSTOMER

Initials DMJ:dmj DMJ VKW :DEA(FS3) --- 1 SET

Date 31.01.2011 31.01.2011 31.01.2011

Sr.

No.Description Guaranteed Particulars

1 Name of Manufacture and country of

origin transformer

CTR Manufacturing Industries Ltd. Pune

INDIA

2 Reference standards Manufacturer's relevant IS, BS

3 Details of system equipments FEC, CB, TCIV,DETECTORS

4 FEC(Fire Extinguishing Cubicle)

4.1 Dimensions (LXBXH) mm 1600X600X1800+100(Base)

4.2 Weight 550 kg Maximum

4.3 Capacity of Nitrogen cylinder 2X10 Cubic Meter 150 kg/ sq.cm. Pressure

4.4 Number of cylinders 2

4.5 Pressure of Nitrogen filing 150kg/cm2 Maximum

4.6 Minimum distance of FE cubicle from

the transformer

5 meters or place next to fire wall if fire

fighting wall exists.

4.7 Method of mounting Floor

4.8 Whether the following items are

provided in FE cubicle. If so

furnish make, type & other details.

4.9 Contact manometer GIC/FIEGBIG/ GAUGES BOURDEN,Falling

pressure, Electrical contact

4.10 Pressure Regulator VANAZ/PAARTH/MESSER/EQUIVALENT

4.11 Oil Release Unit CTR

4.12 Gas release unit CTR

4.13 Oil drain assembly CTR

4.14 Pressure /limit switches Pressure switch (Back up) : ORION/ INDFOS/

EQUIVALENT

Limit switch: TECKNIC/ SCHMERSAL/

EQUIVALENT

4.15 No of contacts & spare contacts

(NO&NC)

Limit switches G02=2 NO, G03= 2NO,

G04=1NO+1NC, G05=2NO/ 1NC+1NO,

G06=2NO/1NC+1NO

4.16 Oil drain valve (ABOVE FEC)

4.17 Make PETSON/SUNRISE/EQUIVALENT

4.18 Type Butterfly valve

4.19 Size 125NB

4.20 Type of metal Mild steel

4.21 Nitrogen Injection Valve (ABOVE

FEC)

4.22 Make OSWAL/LEADER/MANIXON/NEO/EQUIVALENT

4.23 Type Gun metal, Lockable, Stem rising

4.24 Size 25NB

4.25 Oil drain pipe Yes

GUARANTEED TECHNICAL PARTICULARS

FOR NITROGEN INJECTION FIRE PREVENTION AND EXTINGUISHING SYSTEM FOR

2 X 315 MVA,400/138/34.5 kV AURO TRANSFORMER FOR CROMPTON GREAVES LIMITED,

..2..

..2..

MUMBAI A/C TATA STEEL LTD, JAMSHEDPUR (W.O.NO. T09849)

4.26 Size 125NB

4.27 Length As per site location, Transformer to FEC &

FEC to Oil Pit.

4.28 Number of openings in the

transformer tank

1

4.29 Material MS,ERW, Heavy duty for TRS to FEC & GI,

Medium for FEC to Oil pit.

5 Control Box

5.1 Dimensions (LXBXH) mm 500x270x700

5.2 Weight 45 Kg Maximum

5.3 Type & Thickness of sheet steel CRCA, 16/14 SWG

5.4 Details of components provided in

the control box

MCB, Relays, Hooters, Contactors,

Indicating lamps, Operating switches, Latch

contactactos, Rotary switches.

5.5 Control voltage 220 VDC

5.6 Method of mounting Wall

5.7 Whether audio and visual alarms

provided?

Yes with different volume (dB) levels

6 Transformer Conservator Isolation Valve (TCIV)

6.1 Make CTR

6.2 Type Operating mechanically of Transformer oil

flow rate with visual position indicator.

6.3 Location In the conservator pipe line between

Conservator and Buchholz relay.

6.4 Whether suitable for pipe of size

80mm dia

Yes

6.5 No of contacts & spare contacts

(NO&NC)

1NO

6.6 Padlocking provision YES

7 Fire Detectors

7.1 Make CTR

7.2 Type Quartz bulb, Heat sensing.

7.3 Quantity required Depending upon transformner top cover area.

7.4 Method of fixing Bolting on bracket on transformer top

cover.

7.5 Effective heat sensing area Circular 2.01 sq. meter (800mm Radius)

7.6 Temperature recommended for

effective heat sensing

141°C

7.7 Number of contacts NO/NC 2 NO

7.8 Necessity and Condition of

Refilling

After operation

8 Whether approved by Tariff Advisory

Committee of India

Yes

..3..

..3..

9

10 Power Supply

10.1 Control box 220 VDC and 230VAC for DC fail alarm

10.2 FEC (lighting) 230VAC

10.3 Extinction period Maximum 3 minutes

10.4 On system activation Maximum 3 minutes

10.5 Oncommencement of Nitrogen

injection

Maximum 30 Seconds

11 FEC suitable for capacity Transformer : 315 MVA

11.1 Dimensions (LXBXH) mm 1600X600X1800+100(Base)

11.2 Weight 550 kg Maximum

11.3 Nitrogen cylinder capacity 2X10 Cubic Meter 150 kg/ sq.cm. Pressure,

68 Litre water capacity

12 Control Box

12.1 Dimensions (LXBXH) mm 500x270x700

12.2 Weight 45 kg Maximum

13 Fire Detectors

13.1 Heat sensing temperature 141°C

13.2 Time of operation

a. For system activation Maximum 50 Maximum 100

Milliseconds Milliseconds

b. For reduction of pressure in

Tank by Nitrogen release

Maximum 730 Maximum 730

Milliseconds Milliseconds

13.3 Any other technical details not

covered above

On line supervision of required signals, DC

supply monitoring, Test facility (excluding

PNRV(TCIV), FD) on live transformer,

Anticondensation heater for FEC.

DMJ:smp

16.11.2010

TECHNICAL PARTICUARS FOR NITROGEN INJECTION SYSTEM FOR PREVENTION OF

TRANSFORMER EXPLOSION

Transformer Tank Fire Extinction

Explosion Prevention

CTR FIRE SYSTEMS DIVISION 1/2

POONA

FUNCTIONAL DESCRIPTION OF NITROGEN INJECTION FIRE PROTECTION SYSTEM FOR OIL FILLED TRANSFORMER

GENERAL : Nitrogen Injection Fire Prevention and extinguishing System designed for oil filled transformers, shall prevent tank explosion and the fire during internal faults resulting in an arc where tank explosion will normally take few seconds after arc generation and also extinguish the external oil fires on transformer top cover due to tank explosion and/or external failures like bushing fires, due to OLTC fires and fire from surrounding equipments. The system shall work on the principle of DRAIN AND STIR and on activation, shall drain a pre-determined quantity of oil from the tank top through outlet valve, to reduce the tank pressure and inject nitrogen gas at high pressure from the lower side of the tank through inlet valves to create stirring action and reduce the temperature of top oil surface below flash point to extinguish the fire. Conservator tank oil shall be isolated during tank explosion and oil fire, to prevent aggravation of oil fire. Transformer isolation shall be an essential pre-condition for activating the system The system shall be designed to operate manually, in case of failure of power source. OPERATIONAL CONTROLS The system is provided with automatic control for fire Prevention and fire extinction besides remote electrical switch control on control box and local manual control in the fire extinguishing cubicle.

Transformer isolation through Master trip relay, or circuit breaker (HV and LV in series) shall be an essential requirement for the system activation in automatic or remote electrical control. (Drawing Nr. FS 1966 A3 01) A. Automatic control:

A.1 Operation under prevention mode :

Due to internal arcing gases are generated, resulting into pressurizing the transformer tank. These leads to operation of differential relay, pressure relief valve and / or buchholz relay. On sensing these faults, which is the first stage of transformer being under fire, a predetermined quantity of oil from tank top is drained, which reduces the pressure in tank. Simultaneously conservator oil is isolated through Pre-stressed non return valve and nitrogen gas starts injecting at predetermined flow and pressure from lower side of the transformer tank to reduce temperature of top oil surface.

2/2 A.2 Operation under extinction mode:

During transformer fire, Pre-stressed non return valve operates and isolates the conservator oil to prevent further aggravation and spreading of fire. Before rupture of tank, Pressure relief valve and / or buchholz relay operates due to pressurization of transformer tank. Due to fire on transformer, Fire detector will operate. After receipt of these signals predetermined quantity of oil will be drained. Simultaneously nitrogen gas starts injecting at predetermined flow and pressure from lower side of the transformer tank to reduce temperature of top oil below flash point and extinguishes the fire.

B. Remote manual In case system failed to operate in Auto mode due to non availability any one signal, operator shall operate system manually by breaking window glass and operating extinction release switch.

C. Local Manual

In case system failed to operate in Auto mode / remote manual mode due to non availability of either signal or failure of power source, operator shall operate system manually from fire extinguishing cubicle and extinguishes the fire.

VKE:dmj

20.04.2003

CTR FIRE SYSTEMS DIVISION

LOCATION:POONA

SR.

NO.ITEM DESCRIPTION

QTY PER

SYSTEMREMARKS

1 FIRE EXTINGUISHING CUBICLE 1 NO

2 CONTROL BOX 1 NO

3 TRANSFORMER CONSERVATOR ISOLATION VALVE

(TCIV)

1 NO

4 FIRE DETECTORS 15 NOS

5 FIRE SURVIVAL CABLE 60 MTRS

6 FIRE RETARDANT LOW SMOKE (FRLS), 12CORE X 1.5

SQ.MM, ARMOURED, COPPER

1200 MTR APPROXIMATE LENGTH *

7 FIRE RETARDANT LOW SMOKE (FRLS), 4CORE X 1.5

SQ.MM, ARMOURED, COPPER

200 MTR

8 PIPES AND CONNECTION FITTINGS (TRANSFORMER-

FEC-OIL PIT)

1 SET

9 PLINTH FOR FIRE EXTINGUISHING CUBICLE 1 NO NOT IN CTR SCOPE OF SUPPLY

10 OIL PIT 1 NO NOT IN CTR SCOPE OF SUPPLY

11 SPARES FOR EACH SUBSTATION

11.1 FILLED NITROGEN CYLINDER (68 LITRE WATER

CAPACITY)

2 Nos.

11.2 HOSE PIPES WITH FITTINGS 1 set

11.3 HEAT SENSOR ASSEMBLY 3 Nos

11.4 PRESSURE REGULATOR ASSEMBLY 1 set

CUSTOMER CROMPTON GREEVES LIMITED MUMBAI (W.O. NR. 9849)

RATING 2 X 315 MVA, 400/138/34.5 kV AUTO TRANSFORMER

BOM FOR NITROGEN INJECTION FIRE PROTECTION SYSTEM

* Cable length through trench between 1. FEC near transformer and Control room 2. CGL

Marshalling box near transformer and control room 3. Control room and control room. May

be calculated on receipt on cable trench layout in autocad 2004/2005 format.

CONSULTANT TATA CONSULTING ENGINEERS LIMTTED, MUMBAI

END USER TATA STEEL LIMITED, JAMSHEDPUR

Prepared Checked Approved by : DEA(FS3) by : SAPM(FS) by : VP3

Initials DMJ:dmj DMJ VKW

Date 05.01.2011 05.01.2011 05.01.2011

CTR FIRE SYSTEMS DIVISION LOCATION:POONA

SEQUENTIAL OPERATIONS OF OIL DRAIN AND NITROGEN INJECTION

FIRE PROTECTION SYSTEM FOR OIL FILLED TRANSFORMERS. On receipt of required operating inputs signals, 220 VDC/110VDC supply is extended through terminal Nr 22 (+ve) and terminal Nr 23(-ve) (Terminal trip (TS1) of control box to Terminal Nr 3 and Terminal Nr 4 (TS3) of Fire Extinguishing cubicle respectively.

• Operation and monitoring of oil release unit and gas release unit.

..2..

Y01 Lifting Magnet Y01 is energized for initiation of

oil release unit i.e. depressurization of transformer tank

G02 Limit Switch Resets Y01 Lifting magnet

(Indicates oil drain valve closed position, prior to initiation of oil

release unit) NC OPEN CONTACT CONTACT

Y02 Lifting Magnet Y02 is energized for initiation of

Nitrogen gas release unit i.e. starting of nitrogen injection

G04 Limit Switch Indicates extinction in progress (NO CLOSE) and resets gas inlet valve closed indication

NC OPEN CONTACT CONTACT

G03 Limit Switch Indicates oil drain

valve open, energizing Lifting magnet Y02

NO CLOSE CONTACT CONTACT

PO4 Pressure switch Back-up for energizing

Lifting magnet Y02

NO CLOSE CONTACT CONTACT

• Monitoring of Nitrogen cylinder pressure

• Mechanical lockings for oil release unit and gas release unit.

• Interlocks a) Interlock is provided for starting draining of oil (Depressurization) from transformer tank through limit switch G02. b) Interlock is provided for starting injection of nitrogen gas into the transformer tank (after depressurization of transformer tank) through limit switch G03/ Pressure switch (P04)

•Spare Contacts for operation Spare contacts are available in control box for operation of Fire Protection system through relay K03.

•Pressure switch (P04) Operating on differential pressure principle. Electrical contact remain open (NO) under static pressure due to transformer oil head. During draining of oil through oil drain located in the fire Extinguishing Cubicle`NO’ contact get closed and energize Lifting Magnet Y02.

VKW:dmj 02.06.2006

P01 Contact Manometer Indication of cylinder pressure low incase pressure drops below the set required minimum cylinder pressure NO CLOSE

CONTACT CONTACT

G05 Limit Switch Indicates ‘Out of service’ on mechanical locking of

oil release unit NO CLOSE

CONTACT CONTACT

G06 Limit Switch Indicates ‘Out of service’ on mechanical locking of

gas release unit NO CLOSE

CONTACT CONTACT