Neutral pickup setting for three phase motor protection
Neutral pickup setting for three phase motor protection
(OP)
I am wandering what to set the neutral pickup setting to for a medium voltage motor relay. I am taking the amp readings from a zero sequence CT. I realize that there should not be any current flowing if every thing is balanced. Should this setting be 1% of FLA or 10% of FLA?





RE: Neutral pickup setting for three phase motor protection
RE: Neutral pickup setting for three phase motor protection
Bill
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"Why not the best?"
Jimmy Carter
RE: Neutral pickup setting for three phase motor protection
RE: Neutral pickup setting for three phase motor protection
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Neutral pickup setting for three phase motor protection
RE: Neutral pickup setting for three phase motor protection
If the system is solidly grounded then the exact setting doesn't matter too much. The setting will not limit the ground fault current anyway.