一种应用启动负荷录波波形分析保护极性的新方法

A New Method of Applying Waveform Record of Starting Load to Analyze Protection Polarity

针对新建电厂不能及时向常规测试仪器提供足够的负荷而造成保护极性正确性无法确定的问题,提出了一种应用启动负荷录波波形分析保护极性的新方法。该方法利用录波波形的时间关系推导电气变量之间的角度关系,即将电压、电流峰值录波标定的时间差换算为相位角,从而判断保护极性的正确性。试验结果表明,该方法简单、实用。

In view of problem that correctness of protection polarity cannot be determined since new power plant cannot provide enough load to general test instrument, the paper proposed a new method of applying waveform record of starting load to analyze protection polarity. The method uses time relation of waveform record to deduce angle relation of electric variables, namely converting time difference calibrated by waveform record of peak of voltage and current to phase angle, so as to judge correctness of protection polarity. The test result showed that the method is simple and practical.