1 000 kV皖南-浙北特高压线路工频参数测试干扰及结果分析

特高压线路工频参数测试干扰分析是选择适合工频参数测试方法及测试结果分析的重要基础。测试了1 000 kV皖南-浙北特高压线路正序和零序参数测试期间的干扰电压信号，分析了其频谱特征；在此基础上，通过与正序参数仿真计算值的对比分析了正序参数实际测试偏差。结果表明：皖南-浙北特高压同塔双回线路工频参数测试期间，干扰电压存在“三相不平衡性及时变性”的特点；工频法和异频法2种不同方法得到的线路参数测试结果存在一定差异；干扰电压“时变”时，线路工频参数测试宜采用异频法。

Interference Analysis of Power Frequency Parameter Measurement for 1 000 kV Wanan-Zhebei UHV Transmission Line

Interference analysis of power frequency parameter measurement of UHV transmission line is an important basis for selecting appropriate anti-interference test method and analyzing the testing result. The interference voltage signals of 1 000 kV Wannan-Zhebei UHV transmission line were tested during measuring the positive sequence and zero sequence parameters, and their spectrum characteristics was analyzed. On this basis, the field testing error of positive sequence parameters was also analyzed. The results show that the interference voltage has unbalance and time-variant features. Some difference exists between the power frequency parameter testing result obtained by power frequency method and that by variable frequency method. When the interference voltage is time-varied, the variable frequency method should be adopted to measure the power frequency parameter of transmission line.