1000kV特高压同塔双回线路正序参数测试技术

Positive Sequence Parameter Measurement Technology of 1 000 kV UHV Double-Circuit Transmission Line on Same Tower

输电线路正序参数是电网故障短路电流计算、短路接地故障点位置确定,正常运行时潮流、电压损失计算,及继电保护定值计算等工作的重要基础。提出了1 000 k V皖电东送特高压同塔双回线路皖南-浙北段正序参数的测试方法,并进行了现场测试及数据分析。结果表明:采用大容量变频电源和励磁变试验装置,可提高测量信号与干扰信号间的信噪比,降低邻近线路感应电压干扰对特高压线路工频参数测试的影响;采用并联电容补偿法和异频法相结合的综合测试方法,可降低阻抗参数测试时感应电流的影响;皖南-浙北特高压线路正序参数宜采用异频法得到的测试结果。

Positive sequence parameters of transmission line are important foundation for short-circuit fault current calculation, shortcircuit ground fault location, power fl ow and voltage loss calculation, and relay protection setting calculation. Anhui-to-East ultra high voltage（UHV） power transmission line is the fi rst 1 000 k V double-circuit line on the same tower in the world. The measuring method of positive sequence parameters of Wannan-Zhebei transmission line was proposed. The fi eld test was implemented and the test data was analyzed. The results show that the use of large-capacity variable-frequency power source and excitation transformer can improve the signal-to-noise ratio of measuring signal to interfering signal. Then, the infl uence of interfering voltage induced by adjacent lines on the frequency parameter measurement of UHV transmission line can be reduced. The combined use of parallel capacitance compensation method and non-power frequency method can reduce the infl uence of the induced current when measuring the impedance parameter. For the positive sequence parameter test of Wannan-Zhebei UHV transmission line, it is appropriate to adopt the test results obtained by non-power frequency method.