一起接地變零序電流保護(hù)動(dòng)作事件分析及預(yù)防
張春剛
(云南電網(wǎng)有限責(zé)任公司昆明供電局，云南 昆明 650200)
摘 要：以一起某 110 kV 變電站內(nèi) 10 kV 接地變由于零序電流保護(hù)采樣的電流互感器錯(cuò)誤，造成接地變保護(hù)裝置動(dòng)作越級(jí)跳閘出口事件為例，分別從后臺(tái)機(jī)報(bào)文顯示、保護(hù)裝置動(dòng)作記錄、現(xiàn)場(chǎng)接地變保護(hù)裝置及回路檢查等方面全面分析本次跳閘原因，并提出相應(yīng)的預(yù)防措施，不僅可為變電站小電阻或消弧線圈接地功能回路分析提供參考，而且能夠?qū)ο到y(tǒng)運(yùn)行的類似隱患防范提供依據(jù)。
關(guān)鍵詞： 接地變；零序電流保護(hù)；預(yù)防措施；零序互感器
中圖分類號(hào)：TM452 ；TM771 文獻(xiàn)標(biāo)識(shí)碼：B 文章編號(hào)：1007-3175(2023)12-0042-03
Analysis and Prevention of a Zero-Sequence Current Protection Action
Event of Grounding Transformer
ZHANG Chun-gang
（Kunming Power Supply Bureau of Yunnan Power Grid Co., Ltd, Kunming 650200, China）
Abstract: This paper takes one accident in which a 10 kV grounding transformer in a 110 kV substation due to the error of the current transformer sampled by zero-sequence current protection, resulting in the action of the grounding transformer protection device override trip outlet as an example, this paper comprehensively analyzed the cause of this trip from the aspects of background machine message display,protection device action record, on-site grounding transformer protection device and loop check, and put forward corresponding preventive measures for this event. This paper can not only provide a reference for the analysis of the grounding functional circuit of the small resistance or arc suppression coil in the substation, but also provide a basis for the prevention of similar hidden dangers in the system operation.
Key words: grounding transformer; zero-sequence current protection; preventive measure; zero-sequence transformer
參考文獻(xiàn)
[1] 鄭瑜，蔣炯鋒. 一起 10 kV 接地變零序保護(hù)誤動(dòng)的事件分析[J]. 電氣技術(shù)，2021，22(2) ：101-104.
[2] 杜輝. 一起風(fēng)電場(chǎng)接地變零序保護(hù)越級(jí)跳閘事故分析[J]. 電力安全技術(shù)，2020，22(6) ：35-39.
[3] 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.
[4] 劉雪霞.10 kV 配電網(wǎng)小電阻接地零序保護(hù)的可靠性研究[D]. 徐州：中國(guó)礦業(yè)大學(xué)，2019.
