一種直流控制電源級差配合試驗滅弧異常的分析及處理
杜軍1 ,武善磊1 ,石磊2 ,李澤龍1 ,段森1
(1 國家能源集團科學技術研究院有限公司,江蘇 南京 210023; 2 國能億利能源有限責任公司電廠,內蒙古 達拉特旗 014300)
摘 要 :發電廠的直流系統級差配合試驗可以驗證直流系統中斷路器的型號、過流保護動作值及不同層級斷路器是否滿足要求。對某發電廠6 kV直流系統控制回路斷路器進行級差配合試驗,在試驗過程中發現本級直流斷路器斷開過程中滅弧存在異?,F象,通過查閱并分析說明書等資料,推斷出本級直流 斷路器的電源側正負極線接反是可能導致滅弧存在異常的原因。在更改接線后,重新對控制回路斷路器進行級差配合試驗,在試驗過程中發現直流斷路器斷開時滅弧正常,驗證了分析的正確,試驗取得了成功。
關鍵詞 : 直流控制電源 ;直流斷路器 ;級差配合試驗 ;滅弧 ;正負極線接反
中圖分類號 :TM561 ;TN86 文獻標識碼 :A 文章編號 :1007-3175(2025)11-0009-05
Analysis and Handling of Arc Extinction Anomalies During Step Coordination Testing of DC Control Power Supply
DU Jun1 , WU Shan-lei1 , SHI Lei2 , LI Ze-long1 , DUAN Sen1
(1 CHN Energy Science and Technology Research Institute, Nanjing 210023, China; 2 Guoneng Yili Energy Co., Ltd. Power Plant, Dalateqi 014300, China)
Abstract: The DC system step coordination test in power plants can verify whether the circuit breaker models, overcurrent protection trip values, and the different hierarchical circuit breakers in the DC system meet the specified requirements. In this paper, a hierarchical coordination test was conducted on the 6 kV DC system control circuit breakers in a power plant. During the test, an abnormal arc extinction phenomenon was observed during the tripping process of the local DC circuit breaker. Through consultation and analysis of manuals and other materials, it was inferred that reverse connection of the positive and negative power supply wires on the source side of the local DC circuit breaker might be the cause of the abnormal arc extinction behavior. After correcting the wiring, the step coordination test was repeated on the control circuit breakers. The subsequent test confirmed normal arc extinction performance during circuit breaker tripping, thereby validating the analysis, and confirming the test’s successtion.
Key words: DC control power supply; DC circuit breaker; step coordination test; arc extinction; reverse connection of posifive and negative wire
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