改进的低压电器短路试验电路功率因数测量方法

Improved Power Factor Measurement Method for Low Voltage Apparatus Short Circuit Test Circuit

低压短路试验电路功率因数测量的主要困难在于短路电流持续时间较短情况下功率因数的准确测定。在零值电流时间法和峰值电流时间法的基础上,提出了一种改进的测量功率因数的面积峰值比法。介绍了面积峰值比法的原理,与零值电流时间法、峰值电流时间法进行了仿真比较,并进行了误差分析。结果表明,面积峰值比法在测量稳定性方面比其他两种方法有较大的优势,测量功率因数的误差可控制在相关标准允许的偏差范围之内。

The main difficulty for the power factor measuring of short circuit test circuit is the accurate measurement of the power factor when the duration of short current is short. This paper proposed a peak area ratio method to improve the power factor. The method compared with the zero value current method and peak valuer current method,and the error analysis was carried out. The results show that this method has the advantage in measurement stability compared to the two other methods ,and the error of the measurement is controlled in the allowable range.