一起母差保護(hù)誤動原因分析與改進(jìn) 

馬全霞，張鋒，胡耀凱 
許繼電氣股份有限公司，河南 許昌 461000 
 

摘 要：針對一起變電站發(fā)生的母差保護(hù)誤動事件，分析了其發(fā)生原因，由于虛焊引起接觸電阻過大，出現(xiàn)異常直流量值，軟件沒有相應(yīng)的閉鎖措施，導(dǎo)致發(fā)生區(qū)外故障時，滿足保護(hù)啟動條件，最終保護(hù)誤動出口。對硬件生產(chǎn)工藝及保護(hù)軟件閉鎖邏輯進(jìn)行了改進(jìn)，為避免類似事故再次發(fā)生提供參考。
關(guān)鍵詞：母差保護(hù)；誤動；虛焊；軟件閉鎖
中圖分類號：TM774 文獻(xiàn)標(biāo)識碼：B 文章編號：1007-3175(2015)06-0030-03

Busbar Differential Protection Misoperation Accident Analysis and Improvement 

MA Quan-xia, ZHANG Feng, HU Yao-kai 
XJ Electric Co., Ltd, Xuchang 461000, China 
 

Abstract: Aiming at a busbar differential protection misoperation accident in substation, this paper analyzed its occurrence reasons. Cold solder joint made contact resistance too large, so as to produce abnormal direct current value, but the software hadn’t the corresponding latching measures, which led to meet starting condition of protection when external faults happened and ultimately the misoperation exit was protected. The hardware manufacturing technique and protection software latching logic were improved to avoid the same accident happening once more.
Key words: busbar differential protection; misoperation; cold solder joint; software latching

參考文獻(xiàn)
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