TO CALCULATE SINGLE PHASE THREE PHASE DIRECT CURRENT Kilowatts I x E x PF 1000 I x E x 1.732 x PF 1000 I x E 1000 KVA I x E 1000 I x E x 1.732 1000 - Horsepower (Output) I x E x %EFF x PF 746 I x E x 1.732 x %EFF x PF 746 I x E x %EFF 746 Amperes when horsepower is known HP x 746 E x %EFF x PF HP x 746 1.732 x E x %EFF x PF HP x 746 E x %EFF Amperes when Kilowatts is known KW x 1000 E x PF KW x 1000 1.732 x E x PF KW x 1000 E Amperes when KVA is known KVA x 1000 E KVA x 1000 1.732 x E - E = Volts %EFF = Percent Efficiency I = Amperes PF = Power Factor

REGULATION FOR TRANSFORMERS. At unity P.F. and F.L. ( NL - FL ) E NL x E = R% x ( X% )2 200 TO CALCULATE VOLTAGE DROP ON FULL LOAD. At 0.8 P.F. and F.L.= R = Losses X = Reactance NL = No Load E = Volts FL = Full Load PF = Power Factor