mshields
Senior Member
- Location
- Boston, MA
Should Ground Fault protection always be provided on 5kV switchgear circuit breakers? 1000A rule is just LV correct?
Medium Voltage OCP and Ground Fault
- Thread starter mshields
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jeremy.zinkofsky
Senior Member
- Location
- nj
Yes. There should also be over/under voltage and over/under frequency protection.
High resistance grounding is standard on 4160 to minimize damage during faults among other reasons. Over/under voltage is common but over/under frequency only if there is reason to suspect this. If fed from a utility there's no practical way for this fault to occur. There are extea requirements for transformers at 10 MVA* that don't apply at smaller ones.
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