電流回路接地要求及兩點(diǎn)接地案例和防護(hù)措施
劉杰,夏石偉,溫英才,楊躍,朱圣群
(國網(wǎng)浙江省電力有限公司檢修分公司,浙江 杭州 311232)
摘 要:針對(duì)目前常見的電流回路兩點(diǎn)接地的危害,就電流回路接地要求進(jìn)行了分析,根據(jù)現(xiàn)場(chǎng)實(shí)際執(zhí)行情況,分析了3 起電流回路兩點(diǎn)接地案例發(fā)生原因,得出電流回路兩點(diǎn)接地大多是因?yàn)檫\(yùn)維檢修工作造成的結(jié)論。針對(duì)電流回路兩點(diǎn)接地可能發(fā)生的環(huán)節(jié),分別從設(shè)計(jì)、施工、運(yùn)維檢修3 個(gè)階段給出了相應(yīng)的防范措施。
關(guān)鍵詞:電流互感器;電流回路;兩點(diǎn)接地;感應(yīng)電流
中圖分類號(hào):TM452;TM645.2 文獻(xiàn)標(biāo)識(shí)碼:B 文章編號(hào):1007-3175(2020)09-0038-05
Grounding Requirements of Current Loop and Two-Point Grounding Cases and Protective Measures
LIU Jie, XIA Shi-wei, WEN Ying-cai, YANG Yue, ZHU Sheng-qun
(Maintenance Company of State Grid Zhejiang Electric Power Co., Ltd, Hangzhou 311 232, China)
Abstract: Aiming at the hazards of current two-point grounding of current loops, the current loop grounding requirements are analyzed. According to the actual implementation on site, the causes of three cases of two-point grounding in the current loop were analyzed.It was concluded that the two points of grounding in the current loop were mostly caused by operation and maintenance work.Aiming at the possible points of two-point grounding of the current loop, corresponding preventive measures were given for the three stages of design, construction, operation and maintenance.
Key words: current transformer; current loop; two-point grounding; induced current
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