二瓦特计测量法的读数与无功功率的计算公式  

Readings of Two-wattmeter Measuring Method and Calculating Formula of Reactive Power

作　　者：刘童驎[1] 

机构地区：[1]山东大学电气工程学院,山东济南250061

出　　处：《电气电子教学学报》2006年第4期53-54,共2页Journal of Electrical and Electronic Education

摘　　要：有些电路教材证明了对称三相电路中,二瓦特计测量法功率表的读数,以及三相无功功率的计算公式,但是仅限于一种接表方法。本文归纳出利用对称负载的阻抗角,计算二瓦特计法表读数的一般规律。该规律不限于二瓦特计法,对仅用一块表来读数时也适用。然后导出了对称三相无功测量的计算公式。In balaced three-phase circuit, some circuitry teaching materials prove reacnngs of two-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.

关 键 词：对称三相电路 二瓦特计法 无功功率测量 

分 类 号：TM933.37[电气工程—电力电子与电力传动] TM131.4