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Generator tripping question

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wbd

Electrical
May 17, 2001
659
For a system that has a generator with a GSU (delta-gnd wye), with a line to ground fault on the line, what trips the generator off line? The generator has relaying for 81O/U, 51V, 32, 27.
 
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No overcurrent protection on a generator, just a voltage-controlled / voltage-restrained O/C relay? Anyway, there's normally at least one earth fault relay on the neutral earth connection for the star winding.
 
On which side of the delta-grd wye GSU is the generator?
 
The generator is connected to the delta side. What is the advantage of having an ungrounded wye versus grounded wye on the distribution line (multi grounded)?
 
It should be the GSU transformer HV SBEF protection (51G-HV) that isolates the generator for SLG fault on distribution side.
51V could operate as the SLG fault on star side will be reflected as LL fault on the delta side.
In case of bolted fault, there could also be voltage dip of adequate magnitude to allow 27 to operate.
 
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