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NTPC Doc. No. 2140-108-01BH-PVE-Y-011 Rev 00 dt.30/03/2007BHEL Doc. No. BP-DG-249-107-0006

20.Terminal box (Main) - Phase separated type IP55, suitable for bottom entry of unarmoured 6x 1C 300 sqmm 3.3 kV, XLPE, Al cable for each winding (Cable lugsand glands included in BHEL EDn. scope)

21. Terminal boxes (Others) - Separate IP55 terminal boxes fora) Space heatersb) RTDs (Windings, brgs.)

c) Exciter(suitable for 3 core 70 sq. mm cable)

22. Paint Shade - Blue shade RAL-5012 Suitable for Thermal PowerStation environment

23. Designed Charecteristics(Calculated)

(A) Open Circuit and Short Circuit characteristics. Annexure 1

(B) Operating curves( and Flux Profile). Annexure II

(C) Efficiency & Excitation data for Operating Points. Annexure III(Motor performance evaluation(6 & 12 pulse)

(D) OC & SC Loss Table( at 45.42, 32.5, 26.25 & 20.42 Hz.). Annexure IV(Various losses during 6/12 pulse operation)

(E) Pulsating torque (Exciting Torque Formula) Annexure V

24. Coupling details - PM 270 REYNOLDS HOLSET Flexible Coupling

25. Driven equipment - Radial ID fan NDZV 47 SIDOR, GD2= 226400 Kg-m2

26. Other information (Motor)GD2 of motor+exciter = 5460 Kg-m2Outside diameter of rotor = 1148 mmTorsional stiffness (Motor shaft) = Refer Shaft Loading Drawing

27. Motor parameters (Design)27.1 Reactances and Time Constants Annexure-VI

These Parameters refer to one system, the other being disconnected.

27.2 Other Parameters

(A) Air gap ampere turn/pole AGAT AT 9995

(B) No load ampere turn/pole NLAT AT 10945(C) Full load ampere turn FLAT AT 23976(D) Pull out torque (12 Pulse) POT P.U.1.65

28 Exciter data(A) Type : BRUSHLESS(B) Number of poles : 8(C) Stator/Rotor turns ratio : 6.01(D) Exciter stator supply PHASES : 3

(Rated values) FREQUENCY : 50VOLTS : 415 V (L-L RMS)

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Annexure -I

OC AND SC CHARACTERISTIC(ACC. TO DESIGN)

0

0.2

0.4

0.6

0.8

1

1.2

1.4

0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2

If/Ifo

U/Un,

Ik/In

ocl agl fll scl Linear (scl)

CURRENT SOURCE CONVERTER FED

THREE PHASE SYNCHRONOUS MOTORSHEET OF

NTPC Korba IDQ4342-8DD05-Z 45237 A 425 31

Pn = 3900 KW Un = 2 X 2300 V Fn = 45.42 Hz

Nn = 545 RPM In = 2 x 564 A Ifn = 360 A

Mn = 68.4 KNM Cos On = -0.90 Ufn = 100 V

H K Nigam Date AME, BHEL Bhopal

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Annexure II

OPERATING CHARACTERISTICS

0

0.2

0.4

0.6

0.8

1

1.2

0 0.2 0.4 0.6 0.8 1 1.2

N/Nn(pu)

P/Pn,

O/On,

U/Un,

I/In,

I/In,

If/Ifn

O/On P/Pn U/Un I/In If/Ifn

NTPC Korba IDQ4342-8DD05-Z 45237 A 425 31

Pn = 3900 KW Un = 2 X 2300 V Fn = 45.42 Hz

Nn = 545 RPM In = 2 x 564 A Ifn = 360 A

Mn = 68.4 KNM Cos On = -0.90 Ufn = 100 V

CURRENT SOURCE CONVERTER FED

THREE PHASE SYNCHRONOUS MOTORSHEET OF

H K Nigam Date AME, BHEL Bhopal

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Annexure - III

Efficiency and Excitation data for operating Points

Project Korba Type 1DQ4342 WO 45237 P 425 31

Calculation of Exciter Data

Ratings Main MachineOutput PN 3900 kW P.F. cosN -0.90Speed NN 545 1/min Efficiency nN 96.5 %Torque MN 68.4 kNm Field Voltage UfN 100 VStator Voltage UN 2X2300 V Field Current IfN 360 AStator Current I1N 2X564 A No Load field Current If0N 148 AMotor Frequency FN 45.42 Hz Supply Frequency FN 50 HzSCR Ik0/IN 0.70 Commutation Reactance xp 0.11 p.u.

Ratings Exciter Machine

Duty type S1 S2 5s S1 S2 5sPS1 50.2 38 kVA PD 46.0 17.2 kWN 520 0 1/min s 1.694 1.0 p.u.F1 50 50 Hz F2 86.6 50 HzU1 390 390 V UD 115 70 VI1 400 240 A ID 400 245 A

Load Pointunit 1 2 3 4 5 6 7 8

P(kW)

3900 1475 1439 1250 788 478 376 45

N(1/min)

545 390 380 365 315 265 245 109

F (Hz) 45.42 32.50 31.67 30.42 26.25 22.08 20.42 9.08U1 (V) 2x 2300 1804 1703 1558 1121 783 724 322EfficiencyS Channel

-0.941 0.940 0.93 0.93 0.92 0.91 0.68

EfficiencyD Channel 0.965 0.955 0.953 0.95 0.94 0.936 0.93 0.705

Motor Line Current-S Channel(A)

na558 577 553 485 425 364 132

Motor Line Current-D Channel(A) 2x 564 275 284 271 240 209 179 64

If(A)

360 290 287 285 230 205 205 205Excitation

Data of

MainMachine

Uf (V) 100 80.6 79.7 79.2 63.9 56.9 56.9 56.9

I1~A

64 52.0 40 39 38.0 37.0 35.0 29.0Stator Dataof Exciter

MachineU1~V

345 280 220 215 205 200 190 155

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Annexure - IVO C & S C Loss Table


Ratings Main MachineOutput PN 3900 kW P.F. cosN -0.90Speed NN 545 1/min Efficiency nN 96.5 %

Torque MN 68.4 kNm Field Voltage UfN 100 VStator Voltage UN 2X2300 V Field Current IfN 360 AStator Current I1N 2X564 A No Load field Current If0N 148 AMotor Frequency FN 45.42 Hz Supply Frequency FN 50 HzSCR Ik0/IN 0.70 Commutation Reactance xp 0.11 p.u.

Losses at rated conditions (calculated value)

Bearing VLaN (kW) 4.6Ventilation VLuN (kW) 8.4Iron VFeN (kW) 34.0Stator I2R Vwg1N (kW) 28.0Stray Load VzN (kW) 9.0Harmonics (damper wdg.) VzSr3N (kW) 4.6

Harmonics (stator wdg.) VzSr1N (kW) 8.4Rotor I2R Vwg2N (kW) 34.0Exciter VerrN (kW) 6.0

Losses as a Function of speed, voltage, current (calculated value).

12 PULSE 6 PULSE

Load Point 1 2 3 1 2 3

KW 3900 1475 1250 1475 1250 788RPM 545 390 365 390 365 315Hz 45.42 32.5 30.42 32.5 30.42 26.25U

1(V) 2300 1804 1558 1804 1558 1121

I1(A) 564 275 271 558 553 485I

F(A) 360 290 285 290 285 230

M/MN 1.0 0.51 0.19 0.51 0.32 0.19

/N 1.0 1.09 0.75 1.09 0.81 0.75

Cos -0.90 -0.90 -0.75 -0.90 -0.75 -0.70

Sin 0.44 0.44 0.71 0.44 0.66 0.71

VLA 4.6 2.0 1.0 2.0 1.5 1.0

VLU 8.4 3.0 0.5 3.0 3.5 0.5

VFE

34.0 19.0 15.0 19.0 15.0 10.0

VWG1

28.0 7.0 6.0 14.0 13.0 10.0

VZ 9.0 2.0 2.0 9.0 9.0 7.0V

ZSR1 approx. 8.4 3.0 0.5 6.0 4.0 1.0

VZSR3 approx.

4.6 2.0 0.3 3.0 2.8 1.0

VWG2

34.0 22.0 22.0 22.0 22.0 14.0

ETA 96.5 96.2 95.5 94.6 94.0 93.0

OC losses(kW) 53 28 23 28 23 14SC losses(kW) 55 17 16 31 30 22

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ANNEXURE -VPULSATING TORQUES

Project Korba Type 1DQ4342 WO 45237 P 425 31Ratings Main Machine

Output PN 3900 kW P.F. cosN -0.90Speed NN 545 1/min Efficiency nN 96.5 %Torque MN 68.4 kNm Field Voltage UfN 100 V

Stator Voltage UN 2X2300 V Field Current IfN 360 AStator Current I1N 2X564 A No Load field Current If0N 148 AMotor Frequency FN 45.42 Hz Supply Frequency FN 50 HzSCR Ik0/IN 0.70 Commutation Reactance xp 0.11 p.u.

Air Gap torque Pulsation with Converter OperationReference base for the pulsating torque mp is the fundamental torque M at the actual operating point. The per unit values ofthe speed n are related to the nominal speed NN of the motor.

A. Integer Harmonic Torques during Start Up and Normal Operation

mp(t)=1+ mp*sin(2**FN*N/NN*t+*/180) p.u.

where mp = pulsating torque amplitude in p.u. M M = motor torque at actual load point = harmonic order number N = motor speed at actual load point

A.1 Natural Commutation Range

Flux = 1.0 p.u. 12 pulse / 2 system 6 pulse / 1 system

F (Hz) 7.0 < F < FN 7.0 < F < FN6 mp6 - 0.18

6 - -91.312 mp12 0.080 0.069

12 117.9 112.618 mp18 - 0.034

18 - -50.924 mp24 0.019 0.015

24 150.6 138.3

A.2 Forced Commutation Range mp in p.u. , in grd.

Flux = 1.0 p.u. 12 pulse / 2 system 6 pulse / 1 system F (Hz) 1.0 3.0 5.0 7.0 1.0 3.0 5.0 7.0

6 mp6 - 0.133 0.288 0.467 0.636

6 - 24.3 16.8 16.2 17.912 mp12 0.085 0.22 0.29 0.28 0.085 0.22 0.298 0.284

12 19.3 17.1 20.8 22.0 19.3 17.1 20.8 22.018 mp18 - 0.077 0.176 0.154 0.082

18 - 16.3 19.8 20.6 -14.8

24 mp24 0.072 0.128 0.062 0.058 0.072 0.128 0.062 0.05824 15.5 21.7 -4.4 -56.1 15.5 21.7 -4.4 -56.1

30 mp30 - 0.068 0.083 0.043 0.013

30 - 15.7 20.1 -48.4 -30.636 mp36 0.064 0.049 0.029 0.009 0.064 0.049 0.029 0.009

36 16.3 10.4 -54.8 99.07 16.3 10.4 -54.8 99.0742 mp42 - 0.061 0.029 0.008 0.010

42 - 17.2 -14.1 -30.8 -1.148 mp48 0.056 0.024 0.005 0.015 0.056 0.024 0.005 0.015

48 18.2 -41.6 91.93 -10.93 18.2 -41.6 91.93 10.93B. Non Integer Air Gap Torque Pulsation due to Ripple Content of DC Link Current

mp(t) = 0.02*sin6*[2*(FN*N/NN-FN)]*t p.u.

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Annexure-VIResistances,reactances and time constants


PN 3900 kW UN 2X2300 V cosN -0.90 DC res. (m) at 25C 120CNN 545 1/min I1N 2X564 A N 96.5 % R1/ph. 12.0 16.7MN 68.4 kNm UfN 100 V If0N 148 A Rf 209 289

FN 45.42 Hz IfN 360 A FN 50 Hz

System I r1 xs1e xs1k

r2 r3

System II r1 xs1e D-Axis xhdxs2

xe3

System I r1 xs1e xs1k

r3

System II r1 xs1e Q-Axis xhqxe3

Resistances,reactances and time constants saturated unsaturated

referred to 1 system, the other being disconnected

1. Rated impedance per phase ZN Ohm 2.30 2.452. Armature winding res. at 75C r1 %o 8.55 8.503. Field winding res. at 75C r2' %o 1.22 1.344. Damper winding res. at 75C r3' %o 14.4 15.835. Zero sequence res. r0 p.u. 2.8 2.8

6. Negative sequence res. ri p.u. 13.4 13.4

7. Armature winding leakage reactance xs1 p.u. 0.069 0.061xs1e p.u. 0.029 0.025xs1k p.u. 0.040 0.036

8. Field winding leakage reactance xs2' p.u. 0.061 0.0509. Damper winding leakage reactance xs3' p.u. 0.040 0.03710. Zero sequence reactance x0 p.u. 0.041 0.03311. Negative sequence reactance x2 p.u. 0.10 0.00812. Direct axis armature reactance xhd p.u. 0.78 0.7013. Quadrature axis armature reactance xhq p.u. 0.70 0.625

14. Direct axis synchronous reactance xd p.u. 0.828 0.728

15. Direct axis transient reactance xd' p.u. 0.11 0.0916. Direct axis subtransient reactance xd'' p.u. 0.072 0.06917. Quadrature axis synchronous reactance xq p.u. 0.75 0.6618. Quadrature axis subtransient reactance xq'' p.u. 0.92 0.075

19. Direct axis transient sc time constant Td' s 0.334 0.28220. Direct axis subtransient sc time constant Td'' s 0.017 0.01121. Quadrature axis subtransient sc time constant Tq'' s 0.024 0.01722. Direct axis transient oc time constant Tdo' s 2.331 2.06825. Direct axis subtransient oc time constant Tdo'' s 0.023 0.01623. Quadrature axis subtransient oc time constant Tqo'' s 0.174 0.15224. Armature sc time constant TG s 0.045 0.034

2140-108-01-BH-PVE-Y-011-1R

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