power factor

[mryan]

determine the flc of a 30 hp,3 phase, 230 volts,synchronos motor with a 90% power factor. 63*1.1=69.3 How do you get 1.1

 

[LarryFine]

It's the reciprocal of 0.9.

 

[Besoeker]

determine the flc of a 30 hp,3 phase, 230 volts,synchronos motor with a 90% power factor. 63*1.1=69.3 How do you get 1.1

What's the efficiency? You need that too.

 

[Smart $]

It's the reciprocal of 0.9.

Also see Table 430.250 footnote(*) to Synchronous-Type column heading.

 

[Electric-Light]

determine the flc of a 30 hp,3 phase, 230 volts,synchronos motor with a 90% power factor. 63*1.1=69.3 How do you get 1.1

Assume full load.
30hp * 0.746kW =22.38kW

22,380W/efficiency/0.9 = VA

VA/230 = FLA

 

[Finite10]

determine the flc of a 30 hp,3 phase, 230 volts,synchronos motor with a 90% power factor. 63*1.1=69.3 How do you get 1.1

Off topic: I like the beer analogy to understand power factor. Pour a beer, the head is the power factor. But the POCO can only charge for the liquid part and the foam does you no good at all.

Efficiency = power output/power input

Amps = 746*HP/V*1.732*eff.*PF (assume perfect efficiency?)

Table 430.250 far right side of table - as stated above - see the * for 90% = 1.1 multiplier referrence.

Perfect power factor is 1 so I see your question mryan. Good luck.