一起10 kV箱式柱上斷路器擊穿故障分析及處理
李嘯，趙高超，惠杰，袁玉國(guó)
(常州博瑞電力自動(dòng)化設(shè)備有限公司，江蘇 常州 213025)
摘 要：針對(duì)某架空線路上的斷路器故障導(dǎo)致保護(hù)跳閘動(dòng)作，重合閘未能消除異常，現(xiàn)場(chǎng)發(fā)現(xiàn) B 相絕緣套管樁頭有明顯燒蝕發(fā)黑的現(xiàn)象，對(duì)下桿的故障斷路器進(jìn)行絕緣電阻和套管端子水平度試驗(yàn)，明確了故障部位；查看饋線終端動(dòng)作報(bào)告，拆解并查看箱內(nèi)元器件情況，對(duì)絕緣套管開(kāi)展 X 光透視和電場(chǎng)仿真分析，得出故障原因?yàn)?B 相帶電主回路貫穿受損的環(huán)氧樹(shù)脂層對(duì)殼體產(chǎn)生擊穿放電，沿面閃絡(luò)后引發(fā)單相接地故障；對(duì)同批次的套管進(jìn)行機(jī)械和電氣性能測(cè)試，排除套管本身缺陷問(wèn)題，明確套管開(kāi)裂原因為其受到瞬間碰撞或人為搬抬時(shí)的外力作用導(dǎo)致環(huán)氧樹(shù)脂層受內(nèi)應(yīng)力并出現(xiàn)肉眼不可見(jiàn)的裂紋。提出了加強(qiáng)環(huán)氧樹(shù)脂澆注的生產(chǎn)工藝，適時(shí)開(kāi)展工頻耐壓試驗(yàn)等防范措施。
關(guān)鍵詞： 斷路器；絕緣套管；擊穿；環(huán)氧樹(shù)脂；故障分析
中圖分類號(hào)：TM561 文獻(xiàn)標(biāo)識(shí)碼：B 文章編號(hào)：1007-3175(2023)12-0045-04
Analysis and Treatment of a Breakdown Fault Happening to
10 kV Box-Mode Column Circuit Breaker
LI Xiao, ZHAO Gao-chao, HUI Jie, YUAN Yu-guo
（Changzhou Boil Electric Power Automation Equipments Co., Ltd, Changzhou 213025, China）
Abstract: A circuit breaker fault occurring to the overhead lines causes trip protection, the reclosing breaker failed to eliminate the abnormality,and the B-phase insulation sleeve pile head is found to have obvious ablation and blackening phenomenon. Through carrying out the insulation resistance test and bushing terminal levelness test to the fault circuit breaker of the lower pole, the fault part is located. Then,the paper views the feeder terminal action report, disassembles and checks the components in the box, and carries out X-ray fluoroscopy and electric field simulation analysis on the insulation sleeve. It finds out that B-phase charged main circuit penetrates the damaged epoxy resin layer, which produces disruptive discharge to the shell and leads to the single-phase grounding fault after the surface flashover. The mechanical and electric performance tests have been taken to the same batch of sleeves to eliminate their own defects, and the reason for sleeve cracking is the external force produced by instantaneous collision or artificial lifting causes the epoxy resin layer to bear internal stress to generate cracks invisible to the naked eye. Therefore, the paper puts forward preventive measures such as strengthening the production process of epoxy resin pouring and carrying out power-frequency voltage-withstand test in time.
Key words: circuit breaker; insulation sleeve; breakdown; epoxy resin; fault analysis
參考文獻(xiàn)
[1] 沈佩琦，李為民，周友東.10 kV 戶外柱上開(kāi)關(guān)存在的問(wèn)題及對(duì)策[J] . 高壓電器，2017，53(4) ：211-214.
[2] 郝放，滕振業(yè). 絕緣套管放電原因分析與對(duì)策[J].科技視界，2012(12) ：59.
[3] 張忠華.6 kV 真空斷路器的故障分析及解決措施[J].電子技術(shù)與軟件工程，2017(14) ：224.
[4] 蒲軍. 簡(jiǎn)易變電站的10 kV 線路保護(hù)越級(jí)跳閘故障分析[J]. 電氣技術(shù)，2021，22(4) ：73-77.
[5] 李通，李順堯，黎浩鈞. 一起10 kV 柱上真空斷路器故障的解體分析[J] . 電工電氣，2021(3) ：70-71.
[6] 中國(guó)電器工業(yè)協(xié)會(huì). 高壓交流斷路器：GB 1984—2014[S]. 北京：中國(guó)標(biāo)準(zhǔn)出版社，2014 ：52-53.
[7] 烏小茜，劉鋒，劉瑞，等.6 kV 高壓開(kāi)關(guān)柜絕緣套管擊穿原因分析及處理[J] . 內(nèi)蒙古電力技術(shù)，2014，32(6) ：117-119.
