Earth current limiting Resistor
Earth current limiting Resistor
(OP)
I work at an old mining installation that uses reactors on the star point of all underground transformers to limit earth fault currents. Why use a reactor instead of resistors? I would have thought reactors would create problems with transients/harmonics during earth fault protection switching.
Any thoughts??
Any thoughts??






RE: Earth current limiting Resistor
RE: Earth current limiting Resistor
RE: Earth current limiting Resistor
Resistance-grounding can provide much greater reduction of fault current without overvoltage concerns, so it has basically replaced reactance-grounding, particularly for industrial facilities.
RE: Earth current limiting Resistor
From my perspective, there still seems to be quite a bit of use for neutral grounding reactors. In fact, I dare say, it seems there has been an increase over the past few years, for reasons that I am not sure of. Clearly more folks use resistors than reactors, but there are certain applications where a reactor is clearly superior, particularly in EHV applications, where the inherent line capacitance is high.