NGR sizing
NGR sizing
(OP)
I am conducting a system study for 6.6KV system. NGR=152
I am trying to figure out current setting of G-F relay. The formula I have is V(L-N)/152,which is 25A. I don't have a lot of experince. Is my calculation right?
I am trying to figure out current setting of G-F relay. The formula I have is V(L-N)/152,which is 25A. I don't have a lot of experince. Is my calculation right?






RE: NGR sizing
To minimize transient voltages on the system, the grounding resistor should be selected so that it is roughly equal or less than the system phase-ground capacitive reactance.