一起接地變零序電流保護動作事件分析及預防
張春剛
(云南電網有限責任公司昆明供電局，云南 昆明 650200)
摘 要：以一起某 110 kV 變電站內 10 kV 接地變由于零序電流保護采樣的電流互感器錯誤，造成接地變保護裝置動作越級跳閘出口事件為例，分別從后臺機報文顯示、保護裝置動作記錄、現場接地變保護裝置及回路檢查等方面全面分析本次跳閘原因，并提出相應的預防措施，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，而且能夠對系統運行的類似隱患防范提供依據。
關鍵詞： 接地變；零序電流保護；預防措施；零序互感器
中圖分類號：TM452 ；TM771 文獻標識碼：B 文章編號：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
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