三相四线制电路中采用两功率表法计量引起的计量误差分析

Error Analysis Based on Two Power Meter Method in the Three-phase Four-wire Circuits

由于两功率表法不能测量三相四线制电路中的零序功率,采用此法将少计量功率,这早已为许多从事电量测试和计量的人员所认识。但在实际测量中,在三相四线制电路中采用两功率表法计量,有可能比实际功率多计量,也可能比实际功率少计量。以火铺火电厂的110 kV升压变压器为例,通过分析该测量方式带来的测量误差来规范测量回路,减小关口电能表的测量误差,对电力企业、电力设计单位、施工单位都有着极为重要的意义。

As the power of zero-sequence circuit can not be measured in the three-phase fourwire circuits by using two power meter, this method will lead to read less measurement of power energy, which has been known in power for many test and measurement staff, In practice, however measured,by using the method of two power meter in the three-phase four-wire circuits,it may have more power than the actual measurement, may also be less than the actual power measurement. By taking the step-up transformer of 110 kV in Huopu power plant for example and analyzing the measurement error to standardize measurement circuit and reduce the crossing Meter measurement errors,which have a very important significance to power enterprises, power design units and the construction units.