一起發電廠10 kV互感器柜過電壓保護器爆炸事故的分析
楊慶賀
(中國大唐集團科學技術研究院有限公司華東電力試驗研究院,安徽 合肥 230088)
摘 要:以某電廠10 kV輸煤空壓機A 段母線電壓互感器柜發生爆炸引起10 kVA段進線開關跳閘為例,論述了電壓互感器柜內過電壓保護器發生爆炸及故障發展的全過程。經過對繼電保護波形分析、電壓互感器柜爆炸現場檢查及過電壓保護器的破拆結果觀察,綜合判斷本次10 kV母線電壓互感器柜發生爆炸的直接原因為柜內過電壓保護器發生電弧放電,引起A相、B相相間短路,進而導致三相母排之間發生短路,短路產生的電弧將母排和母線連接柜金屬隔板燒損。為防類似事故再次發生,給出了防范措施。
關鍵詞:開關柜;過電壓保護器;三相四柱式;金屬氧化物避雷器
中圖分類號:TM451 文獻標識碼:B 文章編號:1007-3175(2021)02-0040-04
Analysis of an Explosion of 10 kV Transformer Cabinet Overvoltage Protective Devices in Power Station
YANG Qing-he
(China Datang Corporation Science and Technology Research Institute Co., Ltd, East China Electric Power Test
Research Institute, Hefei 230088, China)
Abstract: Taking a power plant's 10 kV coal conveying air compressor A section busbar voltage transformer cabinet that exploded, causing the 10 kV A section incoming switch to trip as an example, the whole process of explosion and failure development of the overvoltage protector in the voltage transformer cabinet is discussed. After analyzing the waveform of the relay protection, on-site inspection of the explosion of the voltage transformer cabinet and the observation of the overvoltage protector, it is comprehensively judged that the direct cause of the explosion of the 10 kV busbar voltage transformer cabinet is the occurrence of arc discharge in the overvoltage protector in the cabinet.The arc discharge causes a short circuit between phases A and B, which in turn causes a short circuit among the three-phase busbars. The arc generated by the short circuit burns the metal partitions of the busbar and the busbar connection cabinet. This article gives preventive measures to prevent similar accidents from happening again.
Key words: switchgear; overvoltage protector; three-phase four column; metal oxide arrester
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