ELECTRICAL FORMULAS AT A GLANCE - 1

3 phase  A.C  POWER   (KW)     =   (1.732 x V x I x PF) / 1000
V   - Volts

I    - Current in Amps

PF - Power Factor

1 HP                                             =    746 Watts

Power Factor ( PF )                    =    KW / KVA

Synchronous Speed ( Ns )         =    ( 120 x F ) / P   

F - frequency

P - No. of Poles 

Motor Slip ( % Slip)                    =    (( Ns  -  Nr ) /  Ns)  x 100

Ns  -  Synchronous Speed

Nr  -  Actual Speed

In STAR connection :- 


I L  =   I ph
(Line current = phase current)


V L  =  1.732 x Vph
(Line voltage  =  1.732 x Phase voltage)




In DELTA connection :-

V L  =   V ph

(Line voltage = phase voltage)

I L  =  1.732 x I ph

(Line current  =  1.732 x Phase current)