Negative phase sequence current
Negative phase sequence current
(OP)
Hi,
I came across a domestic generator,a three phase one 25 kVA 400 V 50 Hz one, whereby the current distribution between the three phases are very uneven, 30 A, 20 A and 6 A.I am opinion that the magnitude of the negative phase sequence current flowing in the rotor is too marginal to cause damage to the generator.Any advice.
Guardiano
I came across a domestic generator,a three phase one 25 kVA 400 V 50 Hz one, whereby the current distribution between the three phases are very uneven, 30 A, 20 A and 6 A.I am opinion that the magnitude of the negative phase sequence current flowing in the rotor is too marginal to cause damage to the generator.Any advice.
Guardiano





RE: Negative phase sequence current
RE: Negative phase sequence current
I would venture to say that you are right - derating is definitely appropriate for that level of unbalance.
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(2B)+(2B)' ?
RE: Negative phase sequence current
I see these size generators used for single phase by just using tho phases. Then the current may be 30 Amp, 20 Amp and 0.0 Amp. These will run for years with no rotor problems.
Note that the neutral current may be as much as 25 Amps depending on the amount of 230 Volt loading.
Bill
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