220 kV同塔雙回線(xiàn)路雷擊閃絡(luò)故障分析
徐文玲1,周路遙2
(1 中鐵武漢電氣化局集團(tuán)上海分公司,上海 201713;2 國(guó)網(wǎng)浙江省電力有限公司電力科學(xué)研究院,浙江 杭州 310014)
摘 要:對(duì)某220 kV同塔雙回線(xiàn)路雷擊閃絡(luò)故障進(jìn)行分析。根據(jù)故障巡視情況、雷電信息數(shù)據(jù)、故障錄波情況、ATP-EMTP暫態(tài)仿真分析可綜合判定本次雙回同跳故障為雷電反擊造成,具體過(guò)程為:雷電擊中75#塔頂或相鄰地線(xiàn),雷電流由桿塔接地裝置注入大地,導(dǎo)致75# 桿塔塔頂及塔身電位升高,在雙回線(xiàn)路的B、C兩相形成反擊過(guò)電壓,引起絕緣子串閃絡(luò)并發(fā)生線(xiàn)路同跳。提出根據(jù)線(xiàn)路通道的雷害評(píng)估結(jié)果來(lái)實(shí)施防雷整改,通過(guò)安裝線(xiàn)路避雷器及在桿塔下方架設(shè)耦合地線(xiàn)的改造措施,顯著提高了線(xiàn)路耐雷水平。
關(guān)鍵詞:線(xiàn)路同跳;反擊;雷電信息數(shù)據(jù);故障錄波;ATP-EMTP
中圖分類(lèi)號(hào):TM863 文獻(xiàn)標(biāo)識(shí)碼:B 文章編號(hào):1007-3175(2020)04-0048-04
Analysis of Lightning Flashover Fault on 220 kV Double Circuit Transmission Lines on the Same Tower
XU Wen-ling1, ZHOU Lu-yao2
(1 Wuhan Railway Electrification Bureau Group Shanghai Subsidiary, Shanghai 201713, China;
2 Electric Power Research Institute of State Grid Zhejiang Electric Power Co., Ltd, Hangzhou 310014, China)
Abstract: The lightning flashover failure of a 220 kV double-circuit transmission line is analyzed. According to the fault inspection situation, lightning information data, fault recording conditions, and ATP-EMTP transient simulation analysis, it can be comprehensively determined that the case of simultaneous tripping of double circuit lines was caused by lightning counterattack. The specific process is: the lightning hits 75 # tower top or adjacent ground line, lightning current is injected into the ground by the pole grounding device, which causes the potential of the tower top and tower body of 75 # rising, and counterattack over-voltage is formed in the B and C phases of the double-circuit line, causing the insulator string flashover and line trip. It is proposed to implement the lightning protection rectification based on the results of the lightning damage assessment of the line channel, and the lightning protection level of the line was significantly improved by the installation of line lightning arresters and the reconstruction measures of coupling ground lines under the tower.
Key words: simultaneous trip-out; counterattack; lightning information data; fault recording; ATP-EMTP
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