Generator short circuit
Generator short circuit
(OP)
Hi,
I want to calculate the short circuit for 3 generators in parallel. The purpose is to specify the circuit breakers. Gensets are 2500 kVA each.
By hand:
1. Current per phase @ 230V I = 3623 A.
2. Worst case x"d = 0.11.
3. Max short circuit current (symmetrical) = I/x"d = 33000 (more or less).
4. (3) gensets in parallel=> Isc max = 33 kA x 3 = 100 kA
I think too high.
By software (DOC Win from ABB):
1. For one generator, Isc = 10 kVA (a bit less actually).
2. For 3 gensets, Isc = 24 kA.
Which one is correct you think?
I want to calculate the short circuit for 3 generators in parallel. The purpose is to specify the circuit breakers. Gensets are 2500 kVA each.
By hand:
1. Current per phase @ 230V I = 3623 A.
2. Worst case x"d = 0.11.
3. Max short circuit current (symmetrical) = I/x"d = 33000 (more or less).
4. (3) gensets in parallel=> Isc max = 33 kA x 3 = 100 kA
I think too high.
By software (DOC Win from ABB):
1. For one generator, Isc = 10 kVA (a bit less actually).
2. For 3 gensets, Isc = 24 kA.
Which one is correct you think?






RE: Generator short circuit
RE: Generator short circuit
So what will be the sc on the synchronized busbar?
RE: Generator short circuit
The software solution looks way too low, but what have you got in between the generators and the bus?
RE: Generator short circuit
RE: Generator short circuit
Auslee, is it possible to have a look at your DocWin-file (the *.ile-file)?
ijl at http://pp.kpnet.fi/ijl
RE: Generator short circuit
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It may be like this in theory and practice, but in real life it is completely different.
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