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Ok it's clear that we will have a high risk for the infrastructure in case of a fault, so can we manage an isolation monitor system or zero sequence relay scheme? Purchasing a new transformer is unprobable.

Hello thanks for your comments, to clarify, neutral of generator solidly grunded, first step-up transformer Dy1 4160/400-231, second step-up transformer Dy1 23000/4160-2402, the output of second transformer feeds an 3,5mille aereal 23KV line that feeds 3 operation transformers Dy1 23000/400-231...

I have a configuration of step-up transformer with a 750 KVA generator 400V. The first transformer 400KVA is a D-Y1 4160/400-231V, the second transformer 500KVA, D-Y1 23000/4160-2402V. The main reason for this configuration is for distribution on 23KV to feed different small substation, neutral...

At our plant we have several generators running in parallel at 50HZ, there is a speed trip for the prime movers at 47Hz, is it recommended to put a time delay for this trip so the system can recover from an electrical upset. We have a load shedding system witch the last step is 47.5hz.

Buzzp, my concern is for a petrochemical plant.

Need information concerning “best practices for electrical design”, any link or book will help.

The AC leak current values on our generation instalation in ground connections ranged between 0.07 and 6 Amps. The resuts of these measurements indicate an alert. The impedance of the global grounding system is 0.34Ohm. Witch are the safe current range in a generation building?

Edison123 Thanks for the answer, the current range is 0-5amps but the resonating inductor is to expand the capacitance range.

I need to know the approximately value of the capacitance of the windings for a 6MW generator, 6900V, 50Hz. We are planing to do a Tan Delta test and is important to know if the instrument that we are renting has the correct range. (Delta 2000 1.1pF-1microF). Thanks to all.

peebee It sure is a violation of the NEC, that is wy there is ground fault detector. Configuration of this type are made for getting high reliability. The voltage decreas in the output of the UPS. The control of a TurboGenerator trip because it has a low-voltage protection.

My UPS system is ungrounded and monophase (120VAC), it seems like I have a problem in the distribution because the neutral momentarily went intentionally to ground and the voltage decrease. It seems like I have a fault or a poor isolation in the cables in some part of the system. The ground...