Example: Determine a minimum circuit breaker trip rating and interrupting capacity for a 10 kVA single phase transformer with 4% impedance, to be operated from a 480 volt 60 Hz source. Calculate as follows: Normal Full Load Current = Nameplate Volt Amps Line Volts = 10,000 VA 480 V 20.8...
Calculating kVA. There are only two formulas which you will need to know in order to calculate kVA: Thus, you must select a transformer with a capacity greater than 36.026 kVA. Alternate Choice: Use the FPT full load current rating chart and the secondary voltage in the FPT catalog to esta...
Example: Determine a minimum circuit breaker trip rating and interrupting capacity for a 10 kVA single phase transformer with 4% impedance, to be operated from a 480 volt 60 Hz source. Calculate as follows: Normal Full Load Current = Nameplate Volt Amps Line Volts = 10,000 VA 480 V 20.8...