star delta motor calcs

thingmaker3

Joined May 16, 2005
5,084
Star, or Delta?

For Star (also called "Wye"):
Eline = \(\sqrt{3}\)Ephase
and
Iline = Iphase

But for Delta:
Eline = Ephase
and
Iline = \(\sqrt{3}\)Iphase
 

Thread Starter

slama01902

Joined Nov 12, 2007
2
i need the calculation for the amps for a star delta started motor, terminal box has 6 terminals so you are using 6 wires U1 V1 W1 / U2 V2 W2
eg if you have a 550 kw 400 volts wired in star delta what amps is that???
 

recca02

Joined Apr 2, 2007
1,214
in star
current is
power(input)/(sqrt(3)*line voltage)--line voltage is voltage across two phases.

for delta:
there are two currents
current in each phase and current thru the supply lines,
power/(sqrt(3)*line voltage)
gives line current,
line current=sqrt(3)*phase current
 
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