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Grounding transformers

Grounding transformers

Grounding transformers

(OP)
Hello,

I would like to receive your feedback about grounding transformers:

1) Do you usually have them grounded through a resistance or reactance?
What is it better, reactance or resistance?

2) Have you experienced some transient overvoltages when a single phase to ground along the circuits despite being solidly grounded the grounding transformer?

I thank you in advance your comments and observations!

RE: Grounding transformers

Refer to the IEEE Green book for starters.

RE: Grounding transformers

Resistance grounding is preferred when it comes to avoidance of over voltages.
When it comes to System earthing through grounding transformers, the system zero sequence impedance is a finite value as decided by the grounding transformer design and not zero.
IEEE62.92.1/Table-1 says that if the available earth fault current in the system is more than 60% of the phase fault current then the system qualifies to be Effectively earthed system and the over voltages will be limited to 2.0pu.

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