20 kV線路故障引起越級跳閘的分析及應對措施
屠秉慧,鄧晨,葉國耀,程嘉誠,許超
(國網(wǎng)江蘇省電力有限公司南京供電分公司,江蘇 南京 210019)
摘 要:以同一變電站發(fā)生的兩起20 kV出線線路故障引起后備保護動作導致主變低壓側(cè)跳閘的事故為例,對越級跳閘產(chǎn)生的原因進行分析。根據(jù)保護配置信息,對故障過程進行研究,分析了故障引起越級跳閘的原因,總結(jié)了事故越級跳閘的幾種可能因素,并從調(diào)度工作實際出發(fā),提出合理化應對措施。
關(guān)鍵詞:越級跳閘;開關(guān)拒動;保護拒動
中圖分類號:TM755 文獻標識碼:B 文章編號:1007-3175(2020)10-0028-04
Analysis and Countermeasures of Overstepping Trip Caused by 20 kV Line Fault
TU Bing-hui, DENG Chen, YE Guo-yao, CHENG Jia-cheng, XU Chao
(Nanjing Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd, Nanjing 210019, China)
Abstract: Taking two 20 kV outgoing line faults in the same substation that caused the backup protection to cause tripping on the low-voltage side of the main transformer as an example, the causes of overstepping trip were analyzed. According to the protection configuration information, the fault process is studied, and the reasons for the overstepping trip caused by the fault are analyzed, and several possible factors of the accident overstepping trip are summarized; and proceeding from the actual dispatching work, rationalized countermeasures are proposed.
Key words: overstepping trip; switch refusal; protection refuse to move
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