What rating of circuit breaker to be used in 100KW load,3phase,440 volts at 80% PF? please show the solution.?
a load of 100KW, .8PF,3phase, 440 volts.
- Gary HLv 61 decade agoBest Answer
To solve for apparent power,
PF = kW/kVA ==
kVA = kW/PF ==
kVA = 100/.8 = 125;
Then apparent current will be
125,000/440/SQRT(3) = 164A
"Standard" breaker sizes vary by country - pick one that is at least 20% higher than 164A available to you. I'd say 200A.