一起CT斷線告警引起母線保護退出運行的故障分析
陳剛,錢碧甫,王策
(溫州供電公司,浙江 溫州 325000)
摘 要: 介紹一起由閘刀輔助接點損壞引起母線保護CT 斷線告警的故障,通過對BP-2B 差流回路和閘刀開入邏輯的分析,得出此故障是由于外部回路的閘刀接點開入錯誤所導(dǎo)致,提出多種可行性解決方案,以期減少和杜絕因閘刀輔助接點損壞或接觸不良可能引起的危害。
關(guān)鍵詞: 母線保護;輔助接點;CT 斷線;措施
中圖分類號:TM645.1+1 文獻標識碼:B 文章編號:1007-3175(2014)11-0023-03
Malfunction Analysis of Bus Protection Out of Services Because of Current Transformer Disconnection Alarm
CHEN Gang, QIAN Bi-fu, WANG Ce
(Wenzhou Power Supply Company, Wenzhou 325000, China)
Abstract: Introduction was made to the malfunction of current transformer disconnection alarm owing to the auxiliary contact broken in isolating switch. This paper analyzed the BP-2B difference stream circuit and the making and breaking logic in isolating switch. The mistakes caused by making and breaking of the contacts in isolating switch of peripheral circuit made bus protection out of services. Some feasibility solutions were proposed, so as to reduce and avoid the negative influence of the auxiliary contact broken and poor contact in isolating switch.
Key words: bus protection; auxiliary contact; current transformer disconnection; solution