一种直流控制电源级差配合试验灭弧异常的分析及处理
杜军1 ,武善磊1 ,石磊2 ,李泽龙1 ,段森1
(1 国家能源集团科学技术研究院有限公司,江苏 南京 210023; 2 国能亿利能源有限责任公司电厂,内蒙古 达拉特旗 014300)
摘 要 :发电厂的直流系统级差配合试验可以验证直流系统中断路器的型号、过流保护动作值及不同层级断路器是否满足要求。对某发电厂6 kV直流系统控制回路断路器进行级差配合试验,在试验过程中发现本级直流断路器断开过程中灭弧存在异常现象,通过查阅并分析说明书等资料,推断出本级直流 断路器的电源侧正负极线接反是可能导致灭弧存在异常的原因。在更改接线后,重新对控制回路断路器进行级差配合试验,在试验过程中发现直流断路器断开时灭弧正常,验证了分析的正确,试验取得了成功。
关键词 : 直流控制电源 ;直流断路器 ;级差配合试验 ;灭弧 ;正负极线接反
中图分类号 :TM561 ;TN86 文献标识码 :A 文章编号 :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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