I have a problem solving the following assignment question.
A star-connected balanced three phase load 30 ohms resistance per phase is supplied by 415 v, three-phase generator of efficiency 90%. calculate the power input to the generator.

 

What's your problem?

i need solution to that question.
please help me out!

 

What have you done to solve the problem?

What way do you think you need to do to solve the problem?

Have you read this ... http://forum.allaboutcircuits.com/t...ng-questions-in-the-homework-help-forum.3002/

 

review this page http://www.3phasepower.org/3phasepowercalculation.htm

 

I have a problem solving the following assignment question.
A star-connected balanced three phase load 30 ohms resistance per phase is supplied by 415 v, three-phase generator of efficiency 90%. calculate the power input to the generator.

What have YOU done to try to answer YOUR homework problem?

What power is delivered to a balanced, start-connected load if each phase has a load resistance of R and the three-phase power is 415 V? What assumptions do you need to make, or what additional information do you need, in order to answer that part of the question?

 

Vph=415/√3=239.6

V=IR

Iph=v/R = 239.6/30=7.99

VL =√3Vph

Vph=239.6/√3=138.3

IL=138.3/30=4.6A

p=3*I2R

=3*4.62*30=1917w



this is what i got please assist me

 

Vph=415/√3=239.6

V=IR

Iph=v/R = 239.6/30=7.99

VL =√3Vph

Vph=239.6/√3=138.3

IL=138.3/30=4.6A

p=3*I2R

=3*4.62*30=1917w



this is what i got please assist me

Why are you dividing the voltage by sqrt(3) twice?

 

thanks