Generator Type: LEROY-SOMER LSAM49.1 S4
Rated Power (Power Factor = 0. 8): 5 75.0 kVA. 460 kW
Voltage and Frequency: 3x380V, 50 Hz
Short Circuit Transient Time Constant T'd: 100.0000 ms.
Short Circuit Subtransient Time Constant T" d: 10.0000 ms.
ArmatureD.C. Time Constant T: 15.0000 ms.
Direct Axis Transient Reactance X'd: 0.1750 p.u.
Direct Axis Subtransient Reactance X"d 1.4000 p.u.
t | (Iu-V)e~'/T" noloai | T9 1 no load | I ac rms | lac | |||
no load | rated load | ||||||
(ms) | (kA) | (kA) | (kA) | (kA) | |||
0.0 | -4.36S > | * 1.000 | -4.36S | 4.992 | 0.624 | 0.6S6 | |
1/2T = | 10.0 | -4.368: | 0.368 | -1.607 | 4.992 | 3.385 | 3.724 |
T = | 20.0 | -4.368: | i 0.135 | -0.591 | 4.992 | 4.401 | 4.841 |
3/2T = | 30.0 | -4.368 | ^ 0.050 | -0.217 | 4.992 | 4.775 | 5.252 |
2T = | 40.0 | -4.36S | 0.018 | -0.0S0 | 4.992 | 4.912 | 5.403 |
3T = | 60.0 | -4.368: | i- 0.002 | -0.011 | 4.992 | 4.981 | 5.479 |
GENER.4 TOR 1
TABLE-2
t (ms) | Idc | =f (time) kA | |||
0 | 0.882 x | 1.000 | = | 0.882 | |
1/2T= | 10.0 | 0.882 x | 0.513 | = | 0.453 |
T= | 20.0 | 0.882 x | 0.264 | = | 0.233 |
3/2 T= | 30.0 | 0.882 x | 0.135 | = | 0.119 |
2T= | 40.0 | 0.882 x | 0.069 | = | 0.061 |
3T= | 60.0 | 0.882 x | 0.0 IS | = | 0.016 |
M-LX.POSSIBLE PEAK VALVE OF THE SHORT CIRCUIT CURRENT OF THE GENER.4T01
Assumed, fault occurring in close proximity to the main busbar, resistances neglected.
From tables 1 and 2
|_ SHORT CIRCUIT CURRENT OF MOTORS _
TABLE-3
1 | 0 | 1/2T | T | 2T |
FACTOR | 6.25 | 4 | 2.5 | 1 |
IM(kA) | 8.7362 | 5.5912 | 3.4945 | 1.3978 |
EVALUATION OF THE MAX. VALUE OF THE SHORT CIRCUIT CURRENT IN CASE _ OF FAULT NEAR BUSBAR: _
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