1000 kV皖南—浙北特高压线路零序参数测试  

Zero Sequence Parameter Measurement of 1000 kV Wannan-Zhebei UHV Transmission Line

作　　者：王少华[1] 姜文东[2] 胡文堂[1] 周象贤[1] 李特[1] 吴尊东 

机构地区：[1]国网浙江省电力公司电力科学研究院,杭州310014 [2]国网浙江省电力公司,杭州310007 [3]国网浙江金华供电公司,浙江金华321000

出　　处：《高压电器》2017年第7期13-18,共6页High Voltage Apparatus

基　　金：国家电网公司科技项目(SGJLJSFW[2013]494)~~

摘　　要：输电线路零序参数是电网非全相短路电流、非全相开合电流计算,接地故障点位置确定,零序保护定值计算等工作的重要基础。针对1 000 k V皖南—浙北特高压线路零序参数测试的抗干扰问题,提出了"并联电容补偿与大容量变频电源相结合"的测量方法。测试数据分析结果表明:提高试验电源容量,可提高测量信号的信噪比,有效降低邻近线路感应电压干扰的影响。采用并联电容补偿方法,可降邻近线路产生感应电流对零序阻抗参数测试的影响。工频变相量法和异频法测量结果较为接近,但与理论计算值均存在一定差异,皖南—浙北特高压线路零序参数宜采用异频法得到的测试结果。现场测试结果验证了所提出零序参数测量方法的有效性。Zero sequence parameter of transmission line is an important foundation for short-circuit current calcu- lation on open phase running, opening and closing current calculation on open phase running, short-circuit ground fault location, and zero sequence protection setting calculation. For the interference problem of zero sequence pa- rameter measurement in 1 000 kV Wannan-Zhebei UHV transmission line, in this paper, a ＂shunt capacitor com- pensation combined with large-capacity variable-frequency power source＂ measuring method is proposed. Test data analysis results show that the use of large-capacity power source can improve the signal-to-noise ratio of measuring signal,and reduce the influence of the interfering voltage caused by adjacent lines . The use of parallel capacitance compensation method can reduce the influence of the induced current caused by adjacent lines on the impedance parameter measurement. The measurement results of power frequency method and non-power frequency method is closer, but there are some differences between the test results and the calculated values. For the zero sequence pa- rameter test of Wannan-Zhebei UHV transmission line, it is appropriate to adopt the test results obtained by non- power frequency method. Field test results verify the effectiveness of the proposed zero sequence parameter mea- surement method.

关 键 词：皖电东送 特高压 同塔双回 工频参数 零序阻抗 零序电容 

分 类 号：TM75[电气工程—电力系统及自动化]