Suzhou Electric Appliance Research Institute
期刊號(hào): CN32-1800/TM| ISSN1007-3175

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750 kV雙回平行線路電流不平衡異常情況分析和處理

來源:電工電氣發(fā)布時(shí)間:2022-02-28 10:28 瀏覽次數(shù):562

750 kV雙回平行線路電流不平衡異常情況分析和處理

李山1,頡雅迪1,王曉彤2
(1 國(guó)網(wǎng)新疆電力有限公司科學(xué)研究院,新疆 烏魯木齊 830011;
2 中國(guó)電力科學(xué)研究院有限公司,北京 100192)
 
    摘 要:當(dāng)前短距離雙回平行線路不換位會(huì)引起三相參數(shù)不對(duì)稱,進(jìn)而導(dǎo)致三相電流不對(duì)稱。以某實(shí)際運(yùn)行的 750 kV 雙回平行架設(shè)線路為例,利用 EMTPE 電磁暫態(tài)仿真軟件對(duì)電流不平衡現(xiàn)象進(jìn)行仿真分析,研究相序排列、回路間距離、導(dǎo)線間距離、線路長(zhǎng)度、等值阻抗、地線情況和線路潮流等因素對(duì)電流不平衡的影響,并提出合理的抑制措施。仿真結(jié)果表明:線路潮流較重、雙回線路采用同相序排列且回路間距離較近時(shí),線路上會(huì)出現(xiàn)幅值較大的零序電流,主要以環(huán)流為主,若不宜采用調(diào)整保護(hù)對(duì)策時(shí),可考慮調(diào)整雙回線路為逆相序排列運(yùn)行方式。
    關(guān)鍵詞:電流不平衡;雙回平行線路;序分量;影響因素;EMTPE 電磁暫態(tài)仿真軟件
    中圖分類號(hào):TM726.3     文獻(xiàn)標(biāo)識(shí)碼:B     文章編號(hào):1007-3175(2022)02-0023-05
 
Analysis and Treatment of Current Unbalance Abnormal Situation of
750 kV Double-Circuit Parallel Transmission Line
 
LI Shan1, XIE Ya-di1, WANG Xiao-tong2
(1 State Grid Xinjiang Electric Power Research Institute, Urumqi 830011, China;
2 China Electric Power Research Institute Co., Ltd, Beijing 100192, China)
 
    Abstract: If the phase position of the current short-distance double-circuit parallel lines does not change, the three-phase current will be unsymmetrical.This paper took the 750 kV double-circuit parallel erected line as an example.Simulating and analyzing the phenomenon of current imbalance with EMTPE electromagnetic transient simulation software. It studied factors that might impact the current balance, such as phase sequence arrangement,circuit spacing, conductor spacing, circuit length, equivalent impedance, earth wire condition, line power flow, etc. Based on the results, this research provided corresponding suppression methods. The simulation results show that when the line power flow is heavy, the double-circuit lines are arranged in the same phase sequence and the distance between circuits is relatively short, the large amplitude of zero sequence current will emerge, especially circulation. Under the situation that is not suitable to adopt the adjustment protection countermeasures, adjusting the double-circuit line to reverse phase sequence operation mode could be an alternative.
    Key words: current unbalance; double-circuit parallel transmission line; sequence component; influencing factors; EMTPE electromagnetic transient simulation software
 
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