1 000 kV特高壓同塔雙回線路正序參數(shù)測試技術(shù)
楊靖瑋1，王少華2，江寶3，崔竹葉2，李特2
(1 國網(wǎng)浙江嘉興供電公司，浙江 嘉興 314033；2 國網(wǎng)浙江省電力公司電力科學(xué)研究院，浙江 杭州
310014；3 國網(wǎng)安徽六安供電公司，安徽 六安 237006)
摘 要： 輸電線路正序參數(shù)是電網(wǎng)故障短路電流計(jì)算、短路接地故障點(diǎn)位置確定，正常運(yùn)行時潮流、電壓損失計(jì)算，及繼電保護(hù)定值計(jì)算等工作的重要基礎(chǔ)。提出了1 000 kV 皖電東送特高壓同塔雙回線路皖南- 浙北段正序參數(shù)的測試方法，并進(jìn)行了現(xiàn)場測試及數(shù)據(jù)分析。結(jié)果表明：采用大容量變頻電源和勵磁變試驗(yàn)裝置，可提高測量信號與干擾信號間的信噪比，降低鄰近線路感應(yīng)電壓干擾對特高壓線路工頻參數(shù)測試的影響；采用并聯(lián)電容補(bǔ)償法和異頻法相結(jié)合的綜合測試方法，可降低阻抗參數(shù)測試時感應(yīng)電流的影響；皖南- 浙北特高壓線路正序參數(shù)宜采用異頻法得到的測試結(jié)果。
關(guān)鍵詞： 皖電東送；特高壓；同塔雙回；工頻參數(shù)；正序阻抗；正序電容
中圖分類號：TM726 文獻(xiàn)標(biāo)識碼：B 文章編號：1007-3175(2014)11-0031-05
Positive Sequence Parameter Measurement Technology of 1 000 kV UHV Double-Circuit Transmission Line on Same Tower
YANG Jing-wei1, WANG Shao-hua2, JIANG Bao3, CUI Zhu-ye2, LI Te2
（1 State Grid Zhejiang Jiaxing Power Supply Company, Jiaxing 31 4033 , China; 2 State Grid Zhejiang Electric Power Research Institute, Hangzhou 31 0014, China; 3 State Grid Anhui Lu’an Power Supply Company, Lu’an 237006, China）
Abstract: Positive sequence parameters of transmission line are important foundation for short-circuit fault current calculation, shortcircuit ground fault location, power flow and voltage loss calculation, and relay protection setting calculation. Anhui-to-East ultra high voltage (UHV) power transmission line is the first 1 000 kV 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 field 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 influence 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 influence 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.
Key words: Anhui-to-East power transmission; ultra high voltage; double-circuit line on same tower; frequency parameter; positive sequence impedance; positive sequence capacitance
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