一起330 kV母線差動保護(hù)誤動原因分析研究
田銀剛1，馮曉佳2
（1 國網(wǎng)拉薩供電公司，西藏 拉薩 850000；2 國網(wǎng)西咸新區(qū)供電公司，陜西 西安 712000）
摘 要：針對青海電網(wǎng)某330 kV變電站330 kV母線差動保護(hù)誤動故障情況，介紹了事故前運(yùn)行方式及保護(hù)配置，結(jié)合現(xiàn)場設(shè)備具體情況對造成母線差動保護(hù)動作的原因進(jìn)行了分析，指出此次330 kV #2母線上斷路器跳閘的直接原因是由于檢修試驗(yàn)人員在3342斷路器的C相電流互感器接線盒處檢修時，觸及C相電流互感器接線盒內(nèi)母差保護(hù)RCS-915E所用的第三繞組接線柱導(dǎo)致的。提出了反事故措施及建議，確保設(shè)備安全穩(wěn)定運(yùn)行。
關(guān)鍵詞：母線；差動保護(hù)；反事故措施
中圖分類號：TM645.1+1 文獻(xiàn)標(biāo)識碼：B 文章編號：1007-3175(2019)09-0033-03
Analysis of Misoperation Causes of 330 kV Bus Differential Protection
TIAN Yin-gang1, FENG Xiao-jia2
（1 State Grid Lhasa Electric Power Supply Company, Lhasa 850000, China;
2 State Grid Xixian New Area Electric Power Supply Company, Xi’an 712000, China）
Abstract: Aiming at the faulty situation of 330 kV bus differential protection in certain 330 kV substation of Qinghai Power Grid, this paper introduced the operation mode and protection configuration before the accident happened.Combining the specific conditions of the field equipment, this paper analyzed the causes of the bus differential protection action. It is pointed out that the immediate cause of 330 kV bus No.2 breaker tripping is that the overhaul personnel touches the third winding binding post used in bus differential protection RCS-915E of C-phase current transformer junction box while they are overhauling the C-phase current transformer junction box of 3342 circuit breaker. The anti-accident measures and suggestions are proposed to ensure the safe and stable operation of the equipment.
Key words: busbar; differential protection; anti-accident measures
參考文獻(xiàn)
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