The constant for a three phase 3 element integrating wattmeter is 0.12 revolution of disc per kw.if the meter is normally used with a potential transformer of ratio 22 000/110v and a current transformer of ratio 500/5 aa ; find the error expressed as a percentage of the correct reading from the following test figures for the instrument only :
line voltage = 100v ; current =5.25a ; power factor =1 time to complete 40 revolutions =61s.
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