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《Journal of Electrical & Electronic Education》 2006-04
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Readings of Two-wattmeter Measuring Method and Calculating Formula of Reactive Power

LIU Tong-lin(School of Electrical Engineering,Shandong University,Jinan 250061,China)  
In balaced three-phase circuit,some circuitry teaching materials prove readings of two-wattmeter measuring method and calculating formula of reactive power,it is limited to only one connecting state of wattmeters.This paper concludes general calculative regularity of readings of two-wattmeter method using the impedance angle of balanced load.This law is not only suited to two-wattmeter method but also to one wattmeter case.Then calculating formula of balanced three-phase reactive power by the measured readings has been derived.
【Key Words】: balanced three-phase circuit two-wattmeter method reactive power measurement
【CateGory Index】: TM933.3
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