400kv gt tech data

TECHNICAL PARTICULAR FOR GENERATOR TRANSFORMER

DOCUMENT REVIEW STATUSREJ ROC RWC CFC By ………………… Date………………..Comment Note No……………………………

D 2004-08-24 THIRD ISSUE TANVI MVKC 2004-08-11 SECOND ISSUE TANVI MVKB 2004-06-11 FIRST ISSUE MKK MVK- 2004-04-20 PRELIMMINARY ISSUE MKK MVKRev. : Date : Description : Prepared : Reviewed: Released :

Project Doc.No.

GVK INDUSTRIES LIMITEDJEGURUPADU PHASE – II 228 MW CCPP (KA13E2 – 1)

Responsible Department : Take over Department: Language: en

ProjectGVJ

PS KKS

28BAT10

No. of Sheets 21ab cd ALSTOM Projects India Ltd

Document No.GVJ 02 E ---- P13 DS 202

Sheet

1

ab cd

NAME SIGN.ALSTOM Limited , NAINI ALLAHABAD

SCALE : NTS

TANVI

M V K

TITLE

Technical ParticularsSTEAM TURBINE GENERATOR TRANSFORMER

INDENT No.

T-6591M V K

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MIL

LIM

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TRQF : 04505.C

CUSTOMER

ALSTOM Projects India Limited for GVK

DRAWING No.

A421447ISSUE-D

(1)

Nirjhar Prakash

Nirjhar Prakash

Nirjhar Prakash

Nirjhar Prakash

Nirjhar Prakash


28BAT10 of 21 A421447/D

SL No. Particulars Units

A. GENERATORTRANSFORMER

1.0 General

1.1 Make : ALSTOM

1.2 Type : OUTDOOR

1.3 Number of Windings perphase

: TWO

1.4 Number of Phases : 3

1.5 Service Generator Transformer

1.6 Reference Standard : IS 2026 and CBIPManual on Transformer

2.0 Rating

2.1 Type of Cooling : OFAF

2.2 Rated Power MVA:

120

2.2.1 Transformer outputs(continuous kVA ratings atdifferent ambienttemperature to limit the hotspot temperature to 98°C

5º C10º C15º C20º C25º C30º C35º C40º C45º C50º C

MVAMVAMVAMVAMVAMVAMVAMVAMVAMVA

14113713212812311911310810397

(2)


28BAT10 of 21 A421447/D


2.3 Rated Voltage (No-Load) kV

H.V. : 400

L.V. : 11.5

2.4 Rated Current A

H.V. : 173.4

L.V. : 6031.6

2.5 Rated Frequency Hz : 50

2.6 Connection

H.V. : STAR

L.V. : DELTA

2.7 Vector Group designation : YNd1

2.8 Voltage withstand Time s

a. 110% of rated voltage : Continuos

b. 125% of rated voltage : 1 minutes

c. 140% of rated voltage : 5 Seconds

d. 150% of rated voltage : 1 Seconds

2.9 Overfluxing Capability

a. For Overfluxing Factor 1.1 : Continuos

b. 1.25 : 1 minutes

c. 1.4 : 5 Seconds

2.10 HV Neutral Earthing Solid

(3)


28BAT10 of 21 A421447/D


3.0 Temperature

3.1 Reference ambient temperature °C 49

3.2 Temperature rise over referenceambient Deg. C :

°C

a. Of Top oil by thermometer °C : 50

b. Of winding by resistancemeasurement

°C : 55

3.3 Maximum continuous over loadingcapacity of the transformer withoutexceeding the specified windingtemperature

:As per IS 6600

3.4 Thermal time constant h : 3 (Approx)

4.0 Tappings

4.1 Type : Reversing

4.2 Capacity : FULL

4.3 Range – Steps x % variation : +10% to –10% x 1.25%

4.4 Taps provided on HV/LV Winding : On HV

5.0 Insulation Level Winding Bushing

5.1 Separate source powerfrequency voltage withstand

kVRMS

Winding Bushing

H.V : 38* 38*

L.V. : 50 70

H.V. Neutral : 38 105

(4)


28BAT10 of 21 A421447/D


5.2 Induced overvoltage withstand kVrmsWinding Bushing

H.V : 570* 630(Test as per method II)

L.V. : 50 70

H.V. Neutral : 38 38

5.3 Full wave lightning impulsewithstand voltage

kVpeak Winding Bushing

H.V : 1300 1425

L.V. : 125 170

H.V. Neutral : - 250

5.4 Switching surge withstand voltage kV Peak Winding Bushing

H.V 1050 1050

L.V. N.A. N.A.

6.0 Impedance at Rated Frequencyand 75° C winding temperaturewith 100% rating :

:

6.1 Impedance at principal tap % : 12.5 (+ IS Tol)

6.2 Impedance at maximum voltage tap % : 13.0 (Approx.)

6.3 Impedance at minimum voltage tap % 13.0 (Approx.)

6.4 Reactance at rated current forprincipal tap

% : 12.49 (Approx.)

6.5 Resistance at 75° C. % 0.28 (Approx.)

6.6 Zero Sequence Impedance at 75° Cat principal tap

% : 10.3 (Calculated)

6.7 Capacitance of Windingsa. H.V. – Earth

b. L.V. - Earth

c. H.V - L.V

pF/ph. : 4000 (Calculated)

7800 (Calculated)

1700 (Calculated)

(5)

Nirjhar Prakash

Phase to earth


28BAT10 of 21 A421447/D

SLNo.

Particulars Units

7.0 Guaranteed Losses at PrincipalTap, Full Load and 75° C.

7.1 No load losses at rated voltage andat rated frequency and without any+ve tolerances

kW : 80 Max

7.2 Load Losses at rated current withoutany +ve tolerances

kW : 335 Max @75°C andPrincipal Tap

7.3 Cooler losses without any +vetolerances

kW : 25 Max

8.0 Efficiency at 75° C and 0.8Power Factor Lag and at unitypower factor

:0.8 p.f. 0.85 p.f. 1.0 p.f.

8.1 At full load % :99.570 99.595 99.655

8.2 At 3/4 full load % :99.629 99.650 99.703

8.3 At 1/2 full load % :99.660 99.680 99.728

8.4 Maximum efficiency % :99.728

8.4.1 Load and Power Factor at which itoccurs

:48.868 , Unity p.f.

9.0 Regulation at Full Load at 75° C

9.1 At unity power factor % : 1.06

9.2 At 0.85 power factor lagging % : 7.37

9.3 At 0.8 power factor lagging % : 8.2

10.0 No Load Current referred to HV atrated frequency

10.1 At 90% rated voltage A : 0.5 Approx.



(6)


28BAT10 of 21 A421447/D

SLNo.

Particulars Units

11.0 Approximate Maximum FluxDensity at rated frequency in thecore

11.1 At 90% rated voltage Wb/m2

: 1.53 Approx.


: 1.70 Approx.


: 1.87 Approx.

12.0 Maximum Current Density atrated load

: At rated Tap

12.1 H.V. Winding A/cm2

: 3.15

12.2 L.V. Winding A/cm2

: 3.48

12.3 Maximum Current Density undershort circuit

:

12.3.1 H.V. Winding A/cm2

:

12.3.2 L.V. Winding A/cm2

:8 times of above

Approx

13.0 Withstand Time without injuryfor

13.1 Three phase dead short circuit atterminal with rated voltagemaintained on the other side.

s : 3 Sec

13.2 Single phase short-circuit atterminal with rated voltagemaintained on other side

s : 3 Sec

14.0 Cooling System

14.1 (a) Number of unit coolers and rating as% of transformer cooling equipment

5 x 25 %

14.1 (b) Temperature range over whichcooler control is adjustable

: 50°C to 110 °C

14.2 Mounting : Vertical

(7)

Nirjhar Prakash


28BAT10 of 21 A421447/D


14.3 Fan motor data

I) Number per cooler and ratingas % of cooler requirement

: 2 x 50 %

ii) Type Axial flow type

iii) Rating kW : 1.6 kW (Approx)

iv) Locked rotor current A 15 A approx.

14.4 Oil pump motor data

I) Number per cooler and ratingas % of cooler requirement

: 1 x 100 %

ii) Type Centrifugal radial flow

iii) Rating kW : 3.2 kW (Approx)

iv) Locked rotor current A 25 Amps

vi) Insulation class F

vii) Motor speed at rated voltage rpm 1400

14.5 Duration for generatortransformer withstand capabilityafter failure of forced coolingunder the following conditions:

I) Full load

ii) Partial load(50%)

iii) No load

min

min

min

10

20

60

14.6 Whether generator transformer iscapable of withstanding for 1hour without load current afterfailure of forced cooling?

Yes

(8)


28BAT10 of 21 A421447/D


15.0 Details of Tank

15.1 Material Steel

15.2 Thickness of sides mm : 10 approx.

15.3 Thickness of bottom mm : 20 approx.

15.4 Thickness of cover mm : 20 approx.

15.5 Tank Designed for :

15.5.1 Vacuum withstand capability formain tank and accessories

mmof Hg

: Full Vacuum

15.5.2 Vacuum leak rate of transformer N/A

15.5.3 Pressure kN/ m2 : 96

15.6 Tank cover - Conventional or belltype?

Bell

16.0 Core

16.1 Type of construction- Core or shell : Core

16.2 Core material used : CRGO

16.3 Thickness of lamination mm : 0.27 Approx.

16.4 Insulation of lamination : Inorganic Coating

16.5 Equivalent cross-sectional area ofcore

cm² : 5378 (Approx)

16.6 Type of joint between core and yoke Fully Mitred

16.7 Percentage silicon content 0.2 % Approx.

(9)


28BAT10 of 21 A421447/D


17.0 Coils17.1 Type of Coil :

a. H.V : Interleaved Disc

b. L.V. : Helical

17.2 Conductor Material : Electrolytic copper

17.3 Insulating Material :

a. H.V – Turn : Paper + Oil Duct

b. L.V - Earth Pressboard Wrap +OilDuct

c. L.V. – Earth : Pressboard Wrap +OilDuct

d. H.V. - L.V. : Pressboard Wrap +OilDuct

17.4 Magnetising inrush current A Approx. 10 times of RatedCurrent

17.5 Magnetising current at ratedfrequency and at rated voltage

A Pl refer Cl. No. 10

17.6 Conductor area approx

HV

LV

mm2

mm2

:

55

1000

18.0 On-load Tap Changer details

18.1 Make : BHEL

18.2 Type : High TransitionResistance Type

18.3 Rated Voltage class of tap changer kV : Suitable for 420 kVNeutral Winding

18.4 Rated Current A : 350

18.5 Auxiliary Power kW : 1.0 kW approx.

18.6 Step voltage V 2886

(10)


28BAT10 of 21 A421447/D


18.7 Number of steps 16

18.8 Control Auto/Manual

18.9 Voltage Control :Automatic/Non-automatic

Auxiliary supply details

:

:

Automatic

415 V, 3Φ

18.10 Maximum Short CircuitCurrent withstand capability :a. Current A : 6 kA

b. Time s : 3 sec

18.11 Local indicator furnished for :

a. Tap position : Yes

b. Operation counter : Yes

18.12 Number of revolutions to completeone step

: 33 approx

18.13 Time to complete one step on Auto /Manual operation

s : 6 Sec (Approx)

18.14 Rated voltage of drive motor V : 415, 3 Φ

18.15 Power required kW : 1.0 approx.

18.16 Approximate overall weight kg 310 Approx.

18.17 Approximate overall dimensions Length(MM)Dia(MM)

2700 (Approx.)

740 (Approx.)18.18 Approximate overall quantity of oil Ltr. 170 Approx.

18.19 Is vacuum filling required? If so,state absolute pressure.

mm ofHg.

Yes, 1 Torr

(11)


28BAT10 of 21 A421447/D


19.0 Insulating Oil

19.1 Approximate volume required for firstfilling

Ltr. : 56 Kl

19.2 10% excess oil furnished ? : Yes

19.3.1 Oil conforms to : : IS:335 IS:1866 Before commission

19.3.2 Details of oil furnished

I) Moisture content

ii) Max tan delta value at 90°C

iii) Resistivity at 90°C

iv) Interfacial tension at 27°C

v) Breakdown strength

ppm

O-cm

N/m

kVrms

:

50 10

0.002 0.01

35 x 1012 6 x 1012

0.04 0.035

30 6019.4 a. Oil preservation system provided ? : Yes

b. Type of oil preservation system : Flexible Seperator +Silicagel

20.0 Bushings (for HV / LV / HVN) : HV HVN LV

20.1 Make : BHEL ALSTOM TELK

20.2 Type : ß---------- OIP------à

20.3 Reference Standard : ß-----------IS:2099--------à

20.4 Voltage Class kV : 420 52 36

20.5 Creepage Distance mm : 10500 1300 900

20.6 Free space required for bushingremoval

mm : 10250 7100 6600

20.7 Whether test tap for tan deltameasurements for H.V bushing areprovided ?

: Yes Yes No

20.8 One minute power frequencywithstand voltage

kVrms : 630 105 70

20.9 Impulse withstand voltage kVPeak : 1425 250 170

(12)


28BAT10 of 21 A421447/D

SLNo.

Particulars Units

HV HVN LV

20.10 Rated current A 1250 1250 12500

20.11 Rated short circuit current and duration kA/s

31.25kA 31.25kA 100 kAß--------------2 sec----------à

20.12 Cantilever strength of the bushing kg 2.5 kN 1.25kN 3.15kN

20.13 Weight of the assembled bushings kg 1250 49 155

20.14 Mounting arrangement of the bushing ß-----------Outdoor-------à

20.15 Whether CTs are included as perspecific requirements?

Yes

21.0 Minimum Clearances

21.1 Between Phases :a. In airI. HVII. LV

mmmm

::

4000 330

b. In oil I. HV ii. LV

mmmm

::

As per Alstom Practices

21.2 Between Phase & Earth :

a. In air I. HV ii. LV

mmmm

::

3500230

b. In oil I. HV ii. LV

mmmm

::

As per Alstom Practices

21.3 Clearance between core and coil mm As per Alstom Practices

21.4 Clearance between coils mm

21.5 Clearance between neutral to groundin air mm 230 (As per CBIP)

22.0 Terminal Connections

22.1 H.V. : Outdoor Bushings

22.2 L.V : Suitable for Bus Duct

22.3 H.V. Neutral : Outdoor Bushing

(13)


28BAT10 of 21 A421447/D


23.0 Marshaling Box

23.1 Weatherproof, suitable for outdoorduty

: Yes

23.2 Degree of protection : IP:55

23.3 Painting shade 631 AS PER IS 5

24.0 Terminal Blocks :

24.1 Make : Phoenix

24.2 Type : Clip-on (disconnecting typefor CT only)

24.3 20% spare terminals furnished? : Yes

25.0 Wiring Instrumentation Power

25.1 Cable type : PVC shielded PVC

25.2 Voltage grade V : Nominal Uo/U 1100300/500

25.3 Conductor Size

Material

Stranded

mm2

Yes /No.

:::

2.5 / 4.0 2.5

Copper Copper

Yes Yes

26.0 Trip and Alarm Contacts Ratings

26.1 Voltage V : 220 V DC

26.2 Rated :

Making current A :

Breaking Current A :

As perGVJ 02 E ----- P13 TC 216

27.0 Accessories

Each transformer furnished withfittings and accessories as perspecification ?

Yes/No.

: Yes

(14)


28BAT10 of 21 A421447/D


28.0 Detail of Conservator

28.1 Volume of Conservator Ltr. : 7.5 % of Total Oil (Approx.)

28.2 Volume of oil between the highest andlowest levels

Ltr. : 2500 Ltr. approx.

29.0 Pressure Release devices

a. Minimum pressure the device is setto operate / rupture

kg /m2

0.49 kg/cm2

b.Alarm and trip contacts provided? Yes

30.0 Approximate Overall Dimension

30.1 Length mm : 10500

30.2 Breadth mm : 9450

30.3 Height mm : 8700

30.4 Crane lift (a) for untanking core and coilassembly (including sling)

mm Not applicablefor Bell Tank

31.0 Approximate Weights

31.1 Core with clamps

Windings with insulation

kg

kg

: 63000 kg Approx.

20000 kg Approx.

31.2 Tanks, fittings and accessories kg : 37000 kg Approx.

31.3 Oil kg : 50000 kg Approx.

31.4 Total Weight kg : 170000 kg Approx.

32.0 Shipping Data

32.1 Weight of the heaviest packageCore / coilBell tank

kgkgkg

: 110000 kg Approx. 83000 kg Approx. 22000 kg Approx.

32.2 Dimension of the largest package (LxBxH)

mm :8500 x 3450 x 4240

(15)


28BAT10 of 21 A421447/D


32.3 Height for untanking the bell tank mm 9700

32.4 List parts detached for transport Refer document no.GVJ 02 E-----P13 LE 203

33 Proposed method of transportationfor the transformer

Nitrogen Filled

33.1 Impact recorder / shock recorderduring transportation provided?

Yes

(16)


28BAT10 of 21 A421447/D


34.0 Tests to be conducted onTransformer

34.1 Routine tests as per specification /relevant standards will be provided?

: Yes

34.2 Tank pressure test As per CBIP Manual

a. Test Pressure at Tank Base kN/m2 : 96(35 +Normal pressure)

b. Duration h : 1

c. Permanent deflection mm : 19

34.3 Tank vacuum test

a. Vacuum : Vacuum at Test Place–25 mm of Hg.

b. Duration h : 1

c. Permanent deflection mm : 19

34.4 Oil leakage test on each transformer :

a. Test pressure at Tank Base kN/m2

: 96(35 +Normal pressure)

b. Duration hours : 8 (As per CBIP)

34.5 Core bolt withstand voltage for 1minute on each transformer

kV : Bolt less Design as PerAlstom Technology

35 GENERAL

Minimum draw bar pull required tomove the transformer on level track?

4 T/Winch,4 Winches(1000 mm betweenwinches minimum)

(17)


28BAT10 of 21 A421447/D


36 ACCESSORIES

A. CURRENT TRANSFORMER

1.0 General

1.1 Make : Mahindra

1.2 Type : Ring Type, Bar Primary

1.3 Reference Standard : IS 2705

1.4 Use : Inside Oil

2.0 Rating Line CT (CT 9 & CT 11)

2.1 C.T.Ratio A : 250/1

2.2 Class : 5 P20

2.3 Insulation level V : 600

2.4 Burden VA : 30

3.0 Insulation Class :

3.1 Temperature rise at rated burdenover top oil temperature

°C : 55

4.0 Characteristics

4.1 Secondary resistance RCT at 75° C O : -

4.2 Knee point voltage Vk V : -

4.3 Excitation current at Vk/2 mA : -

5.0 Rating Line CT (CT 8)

5.1 C.T.Ratio A : 250/1

5.2 Class : PS

(18)


28BAT10 of 21 A421447/D


5.4 Burden VA : -



°C : 55

7.0 Characteristics

7.1 Secondary resistance RCT at 75° C O : < 3 Ω

7.2 Knee point voltage Vk V : > 500

7.3 Excitation current at Vk/2 mA : 125

8.0 Rating Line CT ( CT 31)

8.1 C.T.Ratio A : 250/1

8.2 Class : PS


8.4 Burden VA : -



°C : 55

10.0 Characteristics




11.0 Rating Neutral CT ( NCT 32)

11.1 C.T.Ratio A : 250/1

11.2 Class : PS

(19)


28BAT10 of 21 A421447/D


11.4 Burden VA : -



°C : 55





14.0 Rating NEUTRAL CT ( NCT 12)

14.1 C.T.Ratio A : 250/1

14.2 Class : 5 P20


14.4 Burden VA : 30



°C : 55


16.1 Secondary resistance RCT at 75° C O : -

16.2 Knee point voltage Vk V : -

16.3 Excitation current at Vk/2 mA : -

17.0 Tests : As per IS 2705

(20)


28BAT10 of 21 A421447/D


B TEMPERATURE INDICATORS(OTI / WTI / RWTI )

1 Manufacturer Perfect Control

2 Range 0-150°C

3 Accuracy % +/- 1.5% of FSD

4 Remote Indicator with 4-20 mAProvided

Yes/No Yes (Perfect Control Make)220 V DC Aux. Supply.

(21)

400kv gt tech data

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