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How many kilowatts will a motor use in 30 days if it runs constantly It is 460 volt and pulls 120 amps 3 phase?
Wiki User
∙ 12y ago
In order to determine power from volts and amps, we need to know the power factor and efficiency, but the question did not provide that information, so I will make an educated guess that the efficiency is 0.95 and the power factor is 0.92. The actual motor nameplate ratings will have to factor into the real calculations.
460 V times 120 A is 55.2 KVA. The question did not say, but it is assumed that the 120 A is per phase, so divide by 1.732 (square root of 3) to get winding power of 31.9 KVA, and then multiply by 3 to get total winding power of 95.6 KVA. Multiply by 0.92 and 0.95 to get power in watts of 83.6 KW.
If you want to know kilowatt-hours for 30 days, multiply by 30 and 24 to get 60.2 mega watt-hours.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoThere are several problems with the question. First and foremost, kilowatts is a unit of power dissipation, not energy, so it would not matter if the motor ran for 3 minutes, 30 days, or 3 years. The kilowatts would remain the same. The question should have asked how many kilowatt-hours the motor would use.
Second, in order to determine power from volts and amps, we need to know the power factor and efficiency, but the question did not provide that information, so I will make an educated guess that the efficiency is 0.95 and the power factor is 0.92. The actual motor nameplate ratings will have to factor into the real calculations.
460 V times 120 A is 55.2 KVA. The question did not say, but it is assumed that the 120 A is per phase, so divide by 1.732 (square root of 3) to get winding power of 31.9 KVA, and then multiply by 3 to get total winding power of 95.6 KVA. Multiply by 0.92 and 0.95 to get power in watts of 83.6 KW.
As stated, the motor pulls 83.6 KW for 3 minutes, 30 days, or 3 years.
If you want to know kilowatt-hours for 30 days, multiply by 30 and 24 to get 60.2 mega watt-hours.
Wiki User
∙ 12y agoAnswer
It doesn't matter how long the motor operates. Power is not affected by time.
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