閥區(qū)故障引起的接地極不平衡保護(hù)動作分析
賀紅資
(中國南方電網(wǎng)有限責(zé)任公司超高壓輸電公司大理局,云南 大理 671000)
摘 要:介紹了一起直流工程閥區(qū)直流穿墻套管對地閃絡(luò)故障引起的眾多保護(hù)動作及直流控制保護(hù)系統(tǒng)響應(yīng)過程,對該故障所引起的接地極電流不平衡保護(hù)動作進(jìn)行了分析,找出了導(dǎo)致接地極電流不平衡的故障點及引起接地極故障的原因,即穿墻套管接地引起接地極區(qū)域過壓,進(jìn)而造成放電間隙不夠的接地極線路招弧角被擊穿放電,并提出了對損壞的招弧角進(jìn)行放電間隙的調(diào)整或更換等優(yōu)化建議。
關(guān)鍵詞: 直流穿墻套管;閥區(qū)故障;接地極電流不平衡保護(hù);招弧角擊穿
中圖分類號:TM721.1 文獻(xiàn)標(biāo)識碼:A 文章編號:1007-3175(2023)05-0044-04
Analysis of Earth Electrode Unbalance Protective
Actions Caused by Valve Area Failures
HE Hong-zi
(Dali Bureau of China Southern Power Grid EHV Power Transmission Company, Dali 671000, China)
Abstract: Protective actions and responses of DC control and protection system caused by the flashover failure to the ground from DC wall bushing in the valve area of the DC engineering are introduced. Then, the paper makes analysis of earth electrode current unbalance protective actions caused by this failure and finds out its fault point and causes. The reason for the failure is that the grounding of wall bushing leads to overvoltage in the earth electrode area, which causes the breakdown to the arcing horn of earth electrode lines with inadequate discharge gap. Therefore, to solve this problem, optimization suggestions such as adjustment or replacement of discharge gap for the damaged arcing horn are given.
Key words: DC wall bushing; valve area failure; earth electrode current unbalance protective; arcing horn breakdown
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