500 kV主變后備保護聯跳分段開關的二次回路改進建議
歐俊延
(中國南方電網超高壓輸電公司柳州局，廣西 柳州 545006)
摘 要： 雙母雙分段220 kV 母線接線方式在倒閘操作等特殊運行方式下，提高了保護拒動或誤動的風險。在分析了接入刀閘輔助接點來自動切換跳閘回路的基礎上，提出了一種基于保護裝置平臺的改進思路，即在跳閘邏輯中增加刀閘位置的判據。該方法在微機保護裝置中簡單易行，便于現場人員快速判斷刀閘輔助接點的分合以及整個跳閘出口回路的完好性、正確性，提高了變壓器后備保護的可靠性。
關鍵詞： 變壓器保護；分段開關；后備保護；輔助接點；跳閘判據
中圖分類號：TM645.2 文獻標識碼：B 文章編號：1007-3175(2015)01-0029-03
Secondary Circuit Improvement Suggestion of 500 kV Main Transformer Standby Protection Shunt Tripping Subsection Switch
OU Jun-yan
（Liuzhou Electric Power Bureau, EHV Transmission Company, Liuzhou 545006, China）
Abstract: Under tripping operation etc special running modes, the 220 kV bus bar connection method of double bus bar double subsection had raised protection misguiding or mis-tripping risks. On the basis of analyzing automatic switching tripping circuit connected by auxiliary contractors, this paper raised an improved idea based on protection device platform, that was to say that a judgment of tripping logic was added into knife blade position. The method is simple and easy in microcomputer protection device, easy for onsite working personnel to quickly judge making and breaking of knife blade auxiliary contractors, as well as the integrality and correctness of entire tripping, which raises the transformer standby protection reliability.
Key words: transformer protection; section switch; rear protection; auxiliary connection point; tripping judgment
參考文獻
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