STAR DELTA STARTING CURRENT
DURING STAR CONNECTION
Vphase = 1/root3
Iphase = Iline
Motor only develope 33/100 of torque thus Iphase = I line = 1/3 Istarting
= 300A (clamp)
Therefore Istarting~300X3=900A
DURING DELTA CONNECTION
Vphase=Vline=415V
Iphase = 56A(Clamp) & Iline=100A (Clamp)
Iphase= Iline/root3
ref:
http://www.usmotors.com/products/ProFacts/1-120-7.htm
http://www.eng-tips.com/viewthread.cfm?qid=42958
http://www.eng-tips.com/viewthread.cfm?qid=16137
http://www.eng-tips.com/viewthread.cfm?qid=21948
http://www.eng-tips.com/viewthread.cfm?qid=22786
Vphase = 1/root3
Iphase = Iline
Motor only develope 33/100 of torque thus Iphase = I line = 1/3 Istarting
= 300A (clamp)
Therefore Istarting~300X3=900A
DURING DELTA CONNECTION
Vphase=Vline=415V
Iphase = 56A(Clamp) & Iline=100A (Clamp)
Iphase= Iline/root3
ref:
http://www.usmotors.com/products/ProFacts/1-120-7.htm
http://www.eng-tips.com/viewthread.cfm?qid=42958
http://www.eng-tips.com/viewthread.cfm?qid=16137
http://www.eng-tips.com/viewthread.cfm?qid=21948
http://www.eng-tips.com/viewthread.cfm?qid=22786
posted by zorro at 7:39 AM
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