一起10 kV線路跳閘故障分析
鄧晨1,單婷婷2,許超1,胡善芝1
(1 國(guó)網(wǎng)江蘇省電力有限公司南京供電分公司,江蘇 南京 210019;
2 東南大學(xué) 電氣工程學(xué)院,江蘇 南京 210096)
摘 要:介紹了一起兩系統(tǒng)采用不同接地方式時(shí),其間一條 10 kV 聯(lián)絡(luò)線跳閘的故障,闡述了中性點(diǎn)經(jīng)消弧線圈接地與電阻接地的兩種系統(tǒng)互相轉(zhuǎn)供時(shí)保護(hù)不匹配的問(wèn)題。通過(guò)分析故障起因及處理過(guò)程,對(duì)故障進(jìn)行復(fù)盤(pán)和計(jì)算。針對(duì)此類(lèi)較為特殊的故障提出多種針對(duì)性解決方案,比較優(yōu)劣,得出了最適合于當(dāng)下配網(wǎng)運(yùn)行的解決方案。
關(guān)鍵詞:零序保護(hù);小電阻接地系統(tǒng);保護(hù)不匹配
中圖分類(lèi)號(hào):TM75 文獻(xiàn)標(biāo)識(shí)碼:B 文章編號(hào):1007-3175(2021)07-0034-05
Analysis of a 10 kV Line Tripping Fault
DENG Chen1, SHAN Ting-ting2, XU Chao1,HU Shan-zhi1
(1 Nanjing Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd, Nanjing 210019, China;
2 School of Electrical Engineering, Southeast University, Nanjing 210096, China)
Abstract: Through introducing the happening of a 10 kV tie line tripping fault when two systems use different grounding methods, this paper elaborates the problem of protection mismatch when arc-suppression-coil neutral system and resistance ground neutral system are transferred to each other. After analyzing the causes of this fault and the working process, the fault is reviewed and calculated. A variety of targeted solutions are put forward for these special faults, and currently the best feasible distribution network operation is obtained through
comparing the advantages and disadvantages of different solutions.
Key words: zero sequence protection; low resistance grounding system; protection mismatch
參考文獻(xiàn)
[1] 鞠平. 電力工程[M]. 北京:機(jī)械工業(yè)出版社,2014.
[2] 董凱達(dá),蔡燕春,金震. 小電阻接地配電網(wǎng)零序保護(hù)的改進(jìn)研究[J]. 供用電,2020,37(6) :48-52.
[3] 郭麗偉,薛永端,徐丙垠,等. 中性點(diǎn)接地方式對(duì)供電可靠性的影響分析[J] . 電網(wǎng)技術(shù),2015,39(8) :2340-2345.
[4] 周華,李曉龍. 淺談某 10 kV 變電所零序電流保護(hù)的優(yōu)化改進(jìn)措施[J]. 電器工業(yè),2020(z1) :75-78.
[5] 郭麗偉,薛永端,張林利,等. 含分布式電源的小電阻接地方式配電網(wǎng)單相接地故障分析[J] . 電力系統(tǒng)自動(dòng)化,2015,39(20) :116-123.
[6] 王小輝. 小電阻接地系統(tǒng)兩點(diǎn)接地時(shí)保護(hù)誤動(dòng)淺析[J]. 寶鋼技術(shù),2020(3) :54-57.
[7] 孟夏, 金光明, 張曉春, 等. 電力系統(tǒng)兩相接地故障繼電保護(hù)裝置調(diào)試及分析[J] . 電工技術(shù),2020(2) :122-124.
[8] 李慶華. 探討配電網(wǎng)兩相接地短路故障定位與供電恢復(fù)[J]. 中國(guó)新技術(shù)新產(chǎn)品,2015(19) :45-46.
[9] 劉健,張小慶,張志華,等. 配電網(wǎng)兩相接地短路故障定位與供電恢復(fù)[J] . 電力系統(tǒng)自動(dòng)化,2013,37(5) :105-110.