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QFSN-660-2-22A
660MW THE TYPE TEST REPORT FOR 660MW GENERATOR
DSZ2009-05
Number
DONGFANG ELECTRIC MACHINERY CO., LTD.
OO
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QFSN-660-2-22A
660MW THE TYPE TEST REPORT FOR 660MW GENERATOR
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Contents
1 ................................................................................................................................. 3Rating specification of generator.......................................................................................................... 3
2 ............................................................................................................................................ 4Test standards ........................................................................................................................................ 4
3 ............................................................................... 5Measurement of D.C resistance of stator winding and rotor wind ing ............................................... 5
4 ............................................................................... 6Measurement of insu lation resistance of stator winding and rotor w inding..................................... 6
5 ................................................................................................. 7Withstanding DC voltage test and determining leak current .............................................................. 7
6 ................................................................................................. 8Measurement of insulation resistance of bearing and oil seal to ground ......................................... 8
7 .................................................................... 9Mechanical inspection without excitation ............................................................................................ 9
8 .................................................................................... 10Measurement of AC impedance of excitation winding at different speeds ..................................... 10
9 ................................................................................................................................... 11Open circuit characteristic .................................................................................................................. 1110 1500RPM, 1.3.................. 13No load saturation characteristic at reduced speed (about 1500 r/min) versus field current ........ 13
11 ...................................................................................................................................... 15Phase Sequence Test ........................................................................................................................... 15
12 THDTHF ...................................... 16Measurement of voltage total harmonic distortion and telephone harmonic factor...................... 16
13 .......................................................................................................................................... 17Shaft voltage ......................................................................................................................................... 17
14 ...................................................................................................................................... 18Moments of inertia................................................................................................................................ 18
15 ........................................................................................................................ 19Three phase sustainedshort c ircuit characteristic ........................................................................... 19
16 SCR .................................................................................................................................. 21Short-circuit ratio and .......................................................................................................................... 21
17 Xd........................................................................................................................... 2118 ............................................................................................... 22Load excitation current and voltage regulation ................................................................................. 22
19 ............................................................................................................................ 23Friction and windage losses................................................................................................................ 2320 Pfe.................................................................................................. 24
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Measurement of core losses at the rated voltage and frequency .................................................... 2421 ............................................................................................................................ 26Short-circuit Losses ............................................................................................................................. 26
22 100%80%60% ................................................. 28Determination of generator efficiency by the separation of losses at 100%,80%and 60%load ..... 28
23 .................................................................................................................... 29Equivalent heat runs to determine temperature rises ....................................................................... 29
24 ........................................................................................................................ 32Three phase sudden short c ircui t test ................................................................................................ 32
5 ............................................................................................................................... 34Voltage recovery test ........................................................................................................................... 34
6 ............................................................................................... 36Determination o f negative sequence reactance from the line-to-line sustained short-circui t test 36
7 ........................................................................................... 37Determination ofzero-sequence reactance from the line-to-line and to neutral short-circuit test
............................................................................................................................................................... 37
28 .................................................................................................................... 38Measurement of vibration of frame and stator core .......................................................................... 38
29 ............................................................................. 39Insulation resistance measurement (before h.p and after H.P.) ....................................................... 3930 .......................................................................... 39A.C. Hi-potential test for stator winding and stator terminal bushings af ter heat run test . ........... 39
31 ................................................................................................... 40Measurement of the stator and the rotor winding capacitance ........................................................ 40
32 ............................................................................................... 41Measurement of D.C resistance and insulation resis tance for RTDs .............................................. 41
33 ............................................................................................................................... 42Summary of test results ....................................................................................................................... 42
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1 Rating specification of generator
QFSN-660-2-22A
Type
776.5 MVA
MVA rating
660 MW
Rated output
22000 VRated voltage
20377 A
Rated current
0.85
Power factor
3
No.of phase
50 HZ
Frequency
3000 r/min
Rated speed
F B temp. limited in B class
Insulation class
(at 100) 468.21 V
Exciter voltage
4476 A
Exciter current
0.45 MPa
Rated H2gas pressure
H2o-H2- H2
Cooling mode
YY
Stator winding connection
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2 Test standards
2.1. ADANI660MW ITP
Inspection and test plan for Indian APL660MWgenerator running tests
2.2.
Contract of the production
2.3. IEC60034-1 1
Rotating electrical machines Part 1:Rating and performance
2.4. IEC60034-2 2
Rotating electrical machines Part 2: Methods for determining losses and efficiency
of rotating electrical machinery from tests
2.5. IEC60034-3 3
Rotating electrical machines Part 3:Specific requirements for cylindrical rotor
synchronous machines
2.6. IEC60034-4 4
Rotating electrical machines Part 4:methods for determining synchronous machine
quantities from tests
2.7. IEEE115-2002
IEEE Guide: Test procedures for synchronous machines
2.8. GB/T7064-2008Specific requirements for cylindrical rotor synchronous machines
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3 Measurement of D.C resistance of stator windingand rotor wind ing
3.1. IEC60034-4(57)
Procedure
3.2.
Stator winding
Phase
()Measurement
resistance
Average
()
95
Resistance at 95
(
)
un-balance
(%)U-X 0.0011067
V-Y 0.0010967
W-Z 0.0011067
0.0011034 0.0014856 0.91
Temperature10.1 10.1 95 /
Criteria( R/max - Rmin) / Rmin1.0%
3.3.
Field Winding
Measurement D.C resistance
95 Resistance at 95
()
Field Winding0.07790 0.10081
()
Temperature20 95
3.4.
Judgment Acceptable
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4 Measurement of insulation resistance of stator winding and rotor winding
4.1.
Stator winding to ground
U-VW
U to V W and
ground
V-UW
V to U W and
ground
W-UV
W to U V and
ground
Duration
Megger(V)
(M)
Insulation Resistance1880 1950 2000 15s
(M)Insulation Resistance 7750 9300 9040 60s
Absorptions4.12 4.77 4.52 60s/15s
(M)Insulation Resistance
41500 82600 66900 600s
Polarization Index5.35 8.88 7.40
600s60s
5000
Temperature.9.7
Humidity48
4.2.
Field Winding to ground
Phase
Measurement value
Duration
Temperature
Megger
Field Windingto ground
150 M 60sec 20 500V
4.3. IEEEstd 43 GB/T7064-2008
Criteria
2.0
Stator windingPolarization Index
1.0M
Rotor winding Insulation Resistance
4.4.
Judgment Acceptable
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5 Withstanding DC voltage test and determining leak current
5.1
Generator condition during test: The stator winding without water.
5.2
Test data
UN22000 V unitA
Duration1.0UN 1.5UN 2.0UN 2.5UN 3.0UN 3.5UN
15 s 6 8 17 24 48 91U VW U phase to VW phase
And to ground 60s 4 9 11 26 42 89
15 s 12 12 21 32 53 95V UW V phase to UW phase
And to ground 60s 6 9 16 29 49 93
15 s 8 13 17 38 67 114W VU W phase to VU phase
And to ground 60s 4 7 14 35 60 111
Temperature10.1
Humidity48
Criteria (Imax-Imin)/ Imin50(at 2.5UN)
5.3 GB/T7064-2008(4.10.3)
Criteria
5.4
Judgment Acceptable
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6 Measurement of insulation resistance of bearing and oil seal to ground
6.1 Measurement of insulation resistance slip ring side bearing to ground
(M)Measurement value
()
Temperature
Megger
Slip ring side bearingto ground
100 10 1000V
6.2
Measurement of seal oil insulation resistance(M)
Measurement value
()
Temperature
Megger
Slip ring side to ground60 10 1000V
6.3 GB/T7064-2008(4.10.2.5) 1M
Criteria Not less than 1M
6.4
Judgment Acceptable
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7 Mechanical inspection wi thout excitation
7.1
Mechanical inspection
Abnormal sound: None
7.2
Bearing oil temperature
(
)Outlet oil
()
Bearing temperature
Speed
(r/min)
Inlet oil
()
Turbine side
Exciting side
Turbine side
Exciting side
3000 25.9 43.6 41.3 64.9 60.3
7.3 :9070
Criterion: contract requirement, bearing Temp. 90, bearing & sealing outlet oil Temp70
7.4
Measurement of Shaft Vibration
7.4.1
Test condition
(r/min)
Speed3000
7.4.2
Measuring value
Measure position
T/E
p-pm
E/E
p-pm
Sensor orientation +45 -45 +45 -45
Shaft vibration 27 19 30 64
7.4.3 : Shaftvibration0.076mm(p-p).
Criterion: Shaftvibration: ISO 7919.2-2001 Table A.1(Contract: 0.076mm(p-p)),
7.4.4 .
JudgmentAcceptable
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8 Measurement of AC impedance of excitation winding at different speeds
8.1 .
Measurement of AC impedance of excitation winding at different speeds
Speed
r/min
Frequency(Hz)
Voltage(V)
Current(A)
Impedance
()
Impedance
Unbalancedness
0 50.005 222.19 37.4715.9296
300 50.014 220.71 38.276 5.7663 2.75%600 49.979 216.94 38.525
5.6311 2.34%900 49.978 215.19 39.098
5.5038 2.26%1200 49.990 214.65 39.807
5.3923 2.03%1500 49.997 215.11 40.224
5.3478 0.83%1800 50.024 215.79 41.303
5.2246 2.30%2100 49.989 212.78 41.613
5.1132 2.13%
2400 49.970 211.75 42.3435.0008 2.20%
2700 49.986 211.48 43.290 4.8852 2.31%3000 49.986 209.59 43.901
4.7742 2.27%
8.2 : JB/T8446-2005(6.1.2) , 600r/min 300r/min 5%
Criterion: The difference between impedances cannot overpass5% per 300rpm above 600rpm.
8.3
JudgmentAcceptable
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9 Open circuit characteristic
9.1 IEEE115-2002(4.2.5)
Procedure
9.2
Measuring value
Terminal voltage(line to line)
Frequency
(Hz)
Field current
(A)
Average(V)
50Hz
Corrected(V)
P.U.
49.903 2035.0 24210 24257 1.10
49.927 1799.0 23152 23186 1.05
49.947 1608.0 21976 21999 1.00
49.953 1469.0 21008 21028 0.96
49.964 1329.0 19592 19606 0.89
49.971 1244.0 18728 18739 0.85
49.975 1136.0 17548 17557 0.8049.980 1058.0 16521 16528 0.75
49.982 1018.0 15411 15417 0.70
49.985 894.0 14246 14251 0.65
49.988 814.0 13060 13063 0.59
49.996 685.0 11083 11084 0.50
50.005 533.0 8745 8744 0.40
50.009 355.0 5830 5829 0.26
50.011 299.0 4934 4933 0.22
50.011 0.0 107 107 0.00
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9.3 Open Circuit Characteristic Curve
No load saturation characterisic
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
0 500 1000 1500 2000 2500
If(A)
U/UN
1 Fig1
Ifo
Field Current at Rated Voltage1600A
Ifg
Air-Field Current at Rated Voltage1370A
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10 1500RPM,1.3No load saturation characteristic at reduced speed (about 1500 r/min) versus field current
10.1 IEEE115-2002(4.2.5)
Procedure
10.2
Measuring value
Terminal voltage(line to line)
Frequency
Field current Average
50Hz
Corrected to50Hz
U/UN
Hz A V V p.u
25.086 3778.0 14363 28628 1.30
25.051 3118.0 13715 27374 1.24
24.948 2725.0 13208 26472 1.20
25.010 2326.0 12665 25320 1.15
25.046 2019.0 12103 24162 1.10
25.057 1771.0 11530 23008 1.05
25.079 1588.0 10954 21839 0.99
25.028 1288.0 9623 19225 0.87
25.035 1237.0 9323 18619 0.85
25.043 1129.0 8729 17427 0.79
25.047 1056.0 8273 16516 0.75
25.050 985.0 7777 15523 0.71
25.055 895.0 7145 14259 0.65
25.060 824.0 6605 13178 0.60
25.065 622.0 5016 10006 0.45
25.066 557.0 4528 9032 0.41
25.068 350.0 2800 5585 0.25
25.068 0.0 56.2 112 0.01
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10.3Open Circuit Characteristic Curve
1500rpm
No load saturation characterisic
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
0 500 1000 1500 2000 2500 3000 3500 4000
If(A)
U/UN
2 Fig2
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11 Phase Sequence Test
11.1 IEEE115-2002 (3.7.2)W
VU
Procedure: When generator is rotating in the direction of CW viewed from exciter end the phase
sequence at the terminals is WVU.
11.2
Terminal sketch
Exciter End Turbine End
Z W
Y V
X U
3 Fig3 Top view
11.3 Judgment Conforming to Drawing
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12 THDTHFMeasurement of voltage total harmonic distortion and telephone harmonic factor
12.1 IEC60034-1-2004 ( 9.11) & IEEE115-2002 ( 3.8.1)
Procedure:
12.2
Measurement value
Terminal voltage (V)22000
Frequency (Hz)
49.944
THD
Total harmonic distortion (%)0.31
THF (%)
Telephone harmonic factor0.20
12.3 5% 1.5%
Criteria: Total harmonic distortion not more than 5% and telephone harmonic factor: not more than
1.5%
12.4
JudgmentAcceptable
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13 Shaft voltage
13.1 IEEE115-2002 (3.6.2)
Procedure:
13.2
Test Condition
(r/min)
Speed3000
(V)
Terminal voltage 22000
13.3
Measurement value
U= 4.927 V
Shaft voltage
: U= 4.920 V
Voltage of shaft to ground on exciter end
4 Fig4
13.4 20 V
Criteria Shaft Voltage
13.5 :
Judgment:Acceptable
V V
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14 Moments of inertia
14.1 IEEE115-2002 (4.4.1)
Procedure:
14.2
Measurement value
Driving Motor
Generator
Voltage
(V)
Current
(A)
Input(kW)
Field current
(A)
10077 174.54 2350.25 1600
nN
Rated speed3000 r/min
3150~2850
Speed difference300 r/min
Time difference45.63 s
14.3
Result
GD2
GD2of generator
41.9 t.m2
J
Inertiaof generator
10.469 t.m2
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15 Three phase sustainedshort circuit characteristic
15.1 IEEE115-2002 ( 4.2.8 )
Procedure:
15.2
Measurement value
Field current
Stator current
(A)
Average(A)
P.U.
3317 22703 1.11
3158 21616 1.06
2979 20407 1.00
2637 18114 0.89
2222 15263 0.75
1435 9894 0.49
796 5522 0.27
669 4648 0.23
627 4369 0.21
424 2971 0.15
323 2243 0.11
0 43 0.00
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15.3Short Circuit Characteristic Curve
short-circuit characterisic
0.00
0.20
0.40
0.60
0.80
1.00
1.20
0 500 1000 1500 2000 2500 3000 3500
If(A)
I/IN
5
Fig. 5 Characteristic Curve
IFSI
Field Current at Rated Armature Current2980A
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16 SCRShort-circuit ratio and
16.1 IEEE115-2002 (10.8.1.1)
Procedure:
16.2
Computing result
SCR = Ifo / Ifk=0.54
Ifo
Ifk
In formulas
Ifo is the field current for rated voltage, rated frequency, and no load.
Ifk is the field current for rated armature current on a sustained three-phase short circuit at rated
frequency.
16.3 0.52
Criterion: As per contract, SCR0.52.
17 XdD-axis Synchronous Reactance
17.1 IEEE115-2002 (10.8.1.1)
Procedure:
17.2
Computing result
Xd =Ifk / IFg=2980/1370=2.18
Ifo
Ifk
Ifg
In formulas Ifo is the field current corresponding to the specified armature
voltage on the open-circuit saturation curve
Ifkis the field current corresponding to the specified armature
current on the short-circuit saturation curve
Ifg is the field current for the air-gap line at the specified armature
terminal voltage.
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18 Load excitation current and voltage regulation
cos0.85 0.85 0.85 0.85 0.85 0.85
Output
percentage
% 100 80 75 60 50 25
OutputMW 660 528 495 396 330 165
Terminalvoltagev 22000 22000 22000 22000 22000 22000
Armaturecurrent
A 20377 16302 15283 12226 10189 5094
sin 0.5268 0.5268 0.5268 0.5268 0.5268 0.5268
IfkA 2980 2380 2222 1780 1450 700
XP
Potierreactance
0.1488 0.1488 0.1488 0.1488 0.1488 0.1488
Ra(95)
0.001486 0.001486 0.001486 0.001486 0.001486 0.001486
EP V 25204 24507 24337 23836 23510 22730
EP* P.U 1.146 1.114 1.106 1.083 1.069 1.033
IFS A 680 560 500 410 390 300
IFGA 1370 1370 1370 1370 1370 1370
Loadexcitationcurrent
A 4464 3782 3577 3088 2780 2090
P.U 1.330 1.300 1.276 1.232 1.220 1.116
voltageregulation
factor
% 33.0 30.0 27.6 23.2 22.0 11.6
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19 Friction and windage losses
19.1 IEEE115-2002 ( 4.2.7)
Procedure
19.2
Measurement value
Speed
(r/min)
()
Hydrogen pressure
(MPa)
Hydrogen purity
(%)3000 0.45 99.4
Generator
Condition (A)
Field Current
(kW)
Friction and windage loss
Open circuit0 1072
1205.5kW
Design: Friction and windage losses
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20 PfeMeasurement of core losses at the rated voltage and frequency20.1 IEEE115-2002 ( 4.2.7)
Procedure
20.2
Measurement value
r/min
Speed
MPa
Hydrogen pressure
%
Hydrogen purity
Test Condition3000 0.45 99.4
Driving motor data
Generator data
Voltage (V)
Current(A)
Input power (kW)
Total Loss(kW)
Input power(kW)
Voltage(v)
(U/UN)2
(p.u)
10005 205.19 2904.42 621.9 2282.5 24210 1.22
10086 188.73 2616.83 574.0 2042.8 23152 1.11
10040 177.10 2339.45 529.4 1810.0 21976 1.00
10057 166.97 2192.36 504.8 1687.6 21008 0.91
10073 156.87 1984.37 471.2 1513.2 19592 0.799996 154.95 1881.91 455.2 1426.7 18728 0.73
10008 150.18 1796.46 441.4 1355.1 17548 0.64
10020 147.19 1730.52 430.7 1299.8 16521 0.56
10076 142.08 1680.43 422.3 1258.1 15411 0.49
10051 141.32 1603.52 410.5 1193.0 14246 0.42
10022 138.44 1542.89 369.7 1173.2 13060 0.35
10053 135.62 1471.03 305.2 1165.8 11083 0.25
10057 130.78 1410.37 280.7 1129.7 8745 0.16
10053 129.27 1330.45247.2 1083.2
5830 0.0710119 126.08 1328.75 246.6 1082.2 4934 0.05
10126 125.35 1289.59 218.2 1071.4 107 0.00=+
Input Power of generator= Core loss+ Friction and windage losses
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20.3Input power of generator curve
6
Fig. 6 losses Curve
Core loss at rated armature voltage745.2kW
U=0
Friction and windage losses at U=01072kW
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21 Short-circuit Losses
21.1 IEEE115-2002 ( 4.2.7)
Procedure
21.2
Measurement value
r/min
Speed
MPa
Hydrogen pressure
%
Hydrogen purity
Test Condition3000 0.45 99.4
Driving Motor Data
Generator Data
Voltage(V)
Current(A)
Input power(kW)
Total loss(kW)
Stray-load loss(kW)
Stator ohmicloss(kW)
Current(A)
(I/IN)(p.u)
10016.0 301.63 4539.7 523.5 1020.4 1997.7 22722 1.12
10007.0 285.43 4260.0 498.0 943.9 1820.0 21650 1.06
9992.5 267.39 3963.0 470.7 851.4 1642.7 20526 1.019999.0 229.47 3322.2 413.1 633.6 1277.4 18066 0.89
9960.5 198.11 2717.2 361.7 437.3 920.0 15345 0.75
1005.9 146.33 1796.1 284.7 141.7 371.6 9783 0.48
9956.0 134.13 1425.6 256.2 51.8 119.5 5569 0.27
1003.3 125.52 1299.0 246.0 19.2 35.7 3058 0.15
9986.0 128.73 1274.6 244.7 11.5 20.2 2311 0.11
1006.3 124.45 1239.7 241.5 0.0 0.0 0 0.00
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21.3 Stray-load loss
7
Fig. 7 Stray-load loss
:
From above curve:
I/IN 1.0 0.8 0.75 0.6 0.5 0.25
Stray-load loss
(kW)820.9 504.5 437.6 266.1 175.8 33.9
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22 100%80%60%Determination of generator efficiency by the separation of losses at 100%,80%and60%load
Power factor0.85 0.85 0.85 0.85 0.85 0.85
Output% 100 80 75 60 50 25
OutputkW 660000 528000 495000 396000 330000 165000
Armature current
A 20377 16302 15283 12226 10189 5094
Field currentA 4464 3782 3577 3088 2780 2090
Core losskW
745.2 745.2 745.2 745.2 745.2 745.2
Mechanical losskW
1072.0 1072.0 1072.0 1072.0 1072.0 1072.0
Stray load losskW
820.9 504.5 437.6 266.1 175.8 33.9
(95)
Armature I2R losses
kW1851 1184 1041 666 463 116
Field I2R loss kW 2008.7 1442.3 1289.9 961.3 779.0 440.2
Exciter systemkW
101.4 73.2 65.5 48.8 39.6 22.4
Total LosskW
6599 5022 4651 3760 3274 2429
InputkW
666599 533022 499651 399760 333274 167429
Efficiency%
99.01 99.06 99.07 99.06 99.02 98.55
98.8%
Guaranteed efficiency
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23 Equivalent heat runs to determine temperature rises
23.1 IEEE115-2002 (6.2.4 )
Procedure:
23.2
Test condition
Item
Zeroexcitation
Open Circuit
Short Circuit
Terminal voltage
(V) 0 21967 0
Stator current(A) 0 0 20356
Field voltage(V) 0 136.0 263.61
Field current(A) 0 1612 2970
Frequency(Hz) 49.936 49.95 49.701
Hydrogen pressure
(Mpa) 0.4456 0.4483 0.4493
H2purity% 99.8 99.7 99.4
H2cooling water inlet temperature() 21.7 23.3 21.5
H2 cooling water outlet temperature() 26.6 32.2 27.5
Flow of H2cooling water(m3/h) 60.86 132.26 237.44
Stator winding coolant Inlet flowm
3/h 0 117.0 117.5
Stator winding coolant Inlet pressure Mpa 0 0.22 0.22
Stator winding coolant inlet temperature / 25.0 43
Stator winding coolant outlet temperature / 27.0 59
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23.3 Temperature rise test data sheet
Item
Unit
Zeroexcitation
Open circuit
Short circuit
Cold gas temperature 27.1 33.05 28.9
Hot gas temperature 28.5 38.15 35.5
Max. temperature of stator winding outlet water / 30.1 53.6
(ETD)
Max. Temp. of stator winding / 32.6 57.6
Max. Temp. of core 28.0 58.1 41.0
Max. Temp. of stator end structure part 27.9 41.7 43.7
(R)
Temperature of field winding 29.7 39.4 53.7
23.4
Temperature rise
Item
Unit
Zeroexcitation
Open circuit
Short circuit
Toa Tca Tia
Temperature rise of stator winding outlet water
K / 2.0 16
Hot gas temp. rise
K 1.4 5.1 6.6
Max. Temp. rise of stator winding outlet waterK / 5.1 10.6
Temp. rise of stator windingK / 7.6 14.6
Temp. rise of core
K 0.9 25.1 12.1
Temp. rise of stator end structure partK 0.8 8.7 14.8
(R)
Temp. rise of field windingK 2.6 6.4 24.8
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23.5 Temperature rise for stator winding and field winding at rated operation condition
Unit
Calculating value
Admissible value
Temperature rise of armature windingK 22.2 70
Temperature rise of coreK 36.3 72
(R)
Temperature rise of field windingK 52.8 67
Temperature rise for rated operation condition was estimated by the following formulas.
Armature Winding Ta = Tca + TiaToa
Core T = Tca + TiaToa
Field Winding fm
fc
f
fmfcfI
I
2
23.6.
Judgment Acceptable
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24 Three phase sudden short circui t test
24.1 IEEE 115-2002 ( 11.7.1)
Procedure
24.2
Test operation condition
(V)
Terminal voltage
(A)
Steady-state short-circuit current
(A)
Field current
Before short-circuit 6626 0 422
After short-circuit0 3165 3183 3155 465
24.3
Three phase sudden short circuit wave
8
Fig. 8 Curve
24.4
Analysis of AC component of short-circuit current
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Analysis of ac component of short-circuit current
2.502.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
3.60
3.70
3.80
3.90
4.00
4.10
4.20
4.30
4.40
4.50
0 40 80 120 160 200 240 280 320 360 400
t(ms)
logIK
9
Fig. 9 Curve
24.5
Results
Reactance and time Constant
Measured Valueunsaturated
Xd%
Direct-Axis transient Reactance28.4
Xd%
Direct-Axis Sub-transient Reactance22.3
Tds
Direct-Axis Transient Short-circuit Time Constant1.08
Tds
Direct-Axis Sub-transient Short-circuit Time Constant0.022
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5Voltage recovery test25.1 IEEE 115-2002 ( 11.7.1)
Procedure
25.2
Test operation condition
short-circuitCurrent(A)
sustained voltage
(V)
Field Current
(A)
Before short-circuit
3150.7 0 465
After short-circuit
0 6913 447
25.3
Voltage recovery wave
10
Fig. 10 Voltage recovery wave
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25.4Analysis of voltage recovery wave
Voltage recovery test for time constant
3.750
3.755
3.760
3.765
3.770
3.775
3.780
0 50 100 150 200 250 300
t(ms)
logU
11 Fig. 11
25.5
Test result
Td0
Direct-Axis Transient open-circuit
Time Constant
10.85s
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6Determination of negative sequence reactance from the line-to-line sustainedshort-circuit test26.1 IEEE 115-2002 ( 10.5.4)
Procedure
26.2
Measurement value
Voltage
(V)
Current
(A)
power(W)
NegativeSequenceReactance
()
Negative SequenceReactance
average
()
124.7 425.2 50890 0.162517
192.62 654.9 120960 0.162834
310.66 1088.9 324060 0.157798
0.1610
26.3
Calculations of Negative Sequence Reactance
X P
I2 23
() X X I
U
N
N
2 2
3
( ) (p.u)
26.4
Result
X2Negative Sequence Reactance
25.84 %(unsaturated)
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7Determination ofzero-sequence reactance from the line-to-line and to neutral short -circuit test
27.1 IEEE 115-2002 ( 10.6.5)
Procedure
27.2
Measurement value
Voltage(V)
Current(A)
power(W)
Zero sequence
reactance()
Zero sequencereactanceaverage
()
32.71 436.73 610 0.07483
50.24 662.3 1520 0.07578
84.12 1091.5 4350 0.07698
0.07586
27.3
Calculations of Zero Sequence Reactanc
I
UZ 0 ()
2
1
UI
PZX OO (p.u)
27.4
Result
X0
Zero sequence reactance12.17%(unsaturated)
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28 Measurement of vibration of frame and stator core
28.1
Measurement value
P-P (m)
Vibration of statorcore
P-P(m)
Vibration of frame
Condition
Model of vibration
Vertical
Horizontal
Vertical
Overall frequency 40.61 10.53 5.89
1X21.64 10.1 5.54
Open circuit
2X33.97 2.46 1.75
Overall frequency7.16 10.08 5.6
1X3.87 9.82 5.46
Three phasesteadyshort circuit
2X
5.48 1.7 0.91
28.2 JB/T10392 15 50
Criteria Frame: Not more than 15
Stator core: Not more than 50
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29 Insulation resis tance measurement (before h.p and after H.P.)
Test condition
20.7 0.1 s/cm
Winding Temp. Cooling water conductivity
M
Insulation resistance
V
Megger
Winding Temp.
Before H.P.
After H.P.
U VW
U to V, W and ground3.1 7.4 2500 20.7
V UW
V to U, W and ground6.9 7.5 2500 20.7
Stator winding
and stator
terminal
bushings
W UV
W to U, V and round6.9 7.8 2500 20.7
30 A.C. Hi-potential test for s tator winding and stator terminal bushings after heatrun test.
30.1
Test condition
20.7 0.1 s/cm
Winding Temp. Cooling Water Conductivity
Hz
Frequency
(V)
Applied voltage
(min)
Duration
U VW
U to V, W and ground50 45000 1
V UW
V to U, W and ground50 45000 1
Stator winding
and stator
terminal
bushings
W UV
W to U, V and round50 45000 1
30.2: :2UN+1000 V
Criteria: For stator winding:
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31 Measurement of the stator and the rotor winding capacitance
31.1
Test condition
10.8
Ambient temperature:
10.8
Stator winding temperature
0.2s
The Cooling water conductivity
31.2 --
Capacitance of 1phase winding to ground and other two phases
Stator winding
Application voltage
Capacitance
U VW
U to V, W and ground13200V 214.79 nF
V UW
V to U, W and round 13200V 214.95 nF
W UV
W to U, V and round13200V 215.49 nF
31.3
Capacitance of the rotor winding
Application voltage
Capacitance
Rotor winding
4690v 1.49F
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32 Measurement of D.C resistance and insulation resis tance for RTDs32.1 :11.5
Measurement value Ambient temperature
NO.
DC R.
()
I. R.
(M)
NO.
DC R.
()
I. R.
(M)
NO.
DC R.
()
I. R.
(M)
NO.
DC R.
()
I. R.
(M)
1 104.2/0.7 66.0 26 104.7/1.2 69.6 1 B 104.1/0.7 69.0 26 B 104.1/0.8 61.4
2 104.1/0.7 68.7 27 104.5/1.1 64.7 2 B 104.1/0.7 58.0 27 B 104.1/0.8 74.9
3 104.1/0.7 74.1 28 104.5/1.2 72.1 3 B 104.1/0.7 67.7 28 B 104.2/0.8 63.0
4 104.1/0.7 72.2 29 104.6/1.2 93.1 4 B 104.2/0.8 69.6 29 B 104.1/0.8 59.4
5 104.1/0.7 54.8 30 104.5/1.2 74.5 5 B 104.2/0.8 58.7 30 B 104.2/0.7 71.1
6 104.1/0.6 51.4 31 104.3/0.9 76.8 6 B 104.2/0.8 73.3 31 B 104.0/0.6 67.7
7 104.1/0.7 70.0 32 104.4/0.9 69.2 7 B 104.1/0.7 71.0 32 B 104.1/0.6 71.5
8 104.0/0.6 69.0 33 104.4/0.9 57.4 8 B 104.2/0.8 52.2 33 B 104.0/0.6 66.6
9 104.3/0.8 70.8 34 104.4/1.0 73.0 9 B 104.2/0.7 72.0 34 B 104.0/0.5 61.3
10 104.3/0.8 75.1 35 104.5/1.0 63.3 10 B 104.2/0.7 48.8 35 B 104.0/0.6 72.1
11 104.2/0.7 72.7 36 104.3/1.0 73.6 11 B 104.2/0.8 71.1 36 B 103.9/0.6 71.4
12 104.2/0.7 70.0 37 104.4/1.0 73.3 12 B 104.2/0.7 72.0 37 B 103.9/0.5 76.5
13 104.3/0.9 70.3 38 104.4/1.0 66.8 13 B 104.4/0.9 71.5 38 B 104.0/0.6 70.314 104.3/0.8 50.9 39 104.4/1.1 64.8 14 B 104.4/1.0 56.3 39 B 103.9/0.5 70.0
15 104.2/0.9 57.7 40 104.4/1.0 56.8 15 B 104.5/1.0 65.4 40 B 103.8/0.6 72.0
16 105.2/1.2 93.6 41 104.5/1.1 75.8 16 B 104.8/1.4 49.5 41 B 104.8/1.1 51.3
17 104.7/1.3 67.9 42 104.5/1.1 75.1 17 B 104.5/1.1 66.0 42 B 104.2/0.6 71.4
18 105.1/1.2 70.2 18 B 104.5/1.1 47.4
19 104.8/1.2 55.0 19 B 104.4/1.0 62.5
20 105.0/1.2 74.0 20 B 104.3/1.0 73.7
21 104.8/0.4 72.3 21 B 104.5/1.1 50.9
22 104.8/0.4 74.0 22 B 104.0/0.6 74.0
23 104.7/1.3 74.6 23 B 104.4/1.0 68.3
24 104.8/0.4 68.2 24 B 104.4/1.0 66.4
25 104.6/1.2 76.8 25 B 104.3/0.9 73.1
32.2GB/T7064 1M
Criteria:
32.3
JudgmentAcceptable
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33 Summary of test results
1 table1
Items
Unit
Test value
Design value
Std./Cont. value
(95)
D.C. resistance of armature winding() 0.0014856 0.0015787
(95)
D.C. resistance of field winding() 0.10081 0.10259
Field current of open-circuit(A) 1600 1599.9
Field current of short-circuit
(A) 2980 3007
Short-circuit ratio0.54 0.532 0.52
Field current of full-load(A) 4464 4476.4
Friction & windage Losses(kW) 1072.0 1205.5
Core loss(kW) 745.2 900.34
Stray load loss(kW) 820.9 1424.48
(at95)
Stray ohmic losses(kW) 1851.0 1966.5
(at95)
Field ohmic losskW 2008.7 2055.8
Exciter systemkW 101.4 102
Total Loss(include excitation loss)kW 6599 7654.62
Efficiency(include excitation loss)(%) 99.01 98.85 98.8
GD2GD
2 (t-m2) 41.9 41.328
THD(%) 0.31 5
THF(%) 0.20 1.5
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1 table1
Items
Unit
Test value
Design value
Std./Cont. value
Stator winding temperature rise(K) 22.2 70
Core temperature rise( K) 36.3 72
Field winding temperature rise(K) 52.8 67
Shaft vibration(m) 64 76
Shaft voltage
(V) 4.927 20
Xd
D-axis synchronous reactance() 218.0 218.03
(X2)
Negative sequence reactance(unsaturated)
() 25.84 22.12
X0
Zero sequence reactance(unsaturated) () 12.17 9.54
Xd
Transient reactance(unsaturated)() 28.4 27.65 0.30
XdSub transient reactance(unsaturated)
() 22.3 19.63 0.15
Td
Direct-axis transient S.C. time constant (s) 1.08 1.224
Td
Direct-axis sub transient S.C. timeConstant
(s) 0.022 0.153
Td0
Transient open-circuit time constant(s) 10.85 9.65
(p-p)
Vibration of frame
(m) 10.53 15
(p-p)
Vibration of stator core (m) 40.61 50
Capacitance of stator winding
(nF) 214.95 253.6
Capacitance of rotor winding
(F) 1.49 1.3905