sinhasunilk

 Profile Answers by sinhasunilk 

• Jul 12th, 2010

 

Load is represented in KW. Whether it is single phase or thre phase, same load is to be supplied. You have asked the conversion of 100KW single load to 3 phase load. In three phase equvalent load will also be 100KW. Only thing that current of single phase and 3 phase will change for the same 100KW.

If supply voltage is 250V, then Current of single phase circuit will be
KV₁x I₁xCosA =100, where KV = 0.250, I₁ = required current, Cos A is power factor.
0.250x I₁xCosA =100

For 3 Phase supply, 450 v supply

√3 KV₂x I₂ x Cos A =100.

√3 X0.450x I₂ x Cos A

with equating the two equations we get,

 0.250x I₁xCosA =  √3 X0.450x I₂ x Cos A,

In this way we may calculate the current difference in single phase and 3 phase circuit.