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Use a voltmeter and ammeter to measure the supply voltage and load current drawn by the motor. The product of these two readings will give you the apparent power in volt amperes. Then use a wattmeter to determine the true power of the machine, in watts. The reactive power, in reactive volt amperes, will then be the vector difference between the apparent power and the true power.
4hp = 1 KVAR, so for 25 hp, 25/4= 6025 KVAR
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