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!
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
RE: Grounding transformers
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.