一例直流两点接地导致的保护误动分析
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摘要
描述了一例直流两点接地导致保护误动的事故案例,通过对直流系统绝缘监测仪平衡电桥原理、CSC241变压器综合保护测控装置开关量输入电路的分析,得出直流系统两点接地、综合保护测控装置开关量输入电路设计不当共同导致了事故的发生,并对直流电源回路日常检修维护,跳合闸线圈及开关量输入采集电路的设计提出了建议。
An accident of protection misoperation caused by DC two-point grounding is described in this paper. The analysis on the balanced bridge principle of DC system insulation monitor and the binary input circuit of CSC241 transformer integrated protection measurement and control device led to the conclusion that the DC system two-point grounding and the improper design of the binary input circuit of the measurement and control device commonly led to the accident. Finally, suggestions are given on routine maintenance of the DC power supply circuit and the design of the binary input circuit.
An accident of protection misoperation caused by DC two-point grounding is described in this paper. The analysis on the balanced bridge principle of DC system insulation monitor and the binary input circuit of CSC241 transformer integrated protection measurement and control device led to the conclusion that the DC system two-point grounding and the improper design of the binary input circuit of the measurement and control device commonly led to the accident. Finally, suggestions are given on routine maintenance of the DC power supply circuit and the design of the binary input circuit.
引文
[1]陕西省电力公司,中国电力科学研究院,河北电力科学研究院.直流电源系统绝缘监测装置技术条件:DL/T 1392—2014[S].北京:中国电力出版社,2014.
[2]童诗白,华成英.模拟电子技术基础[M]. 3版.北京:高等教育出版社, 2005.
[3]聊方伦.直流系统接地对保护控制及开关量输入回路的影响分析[J].浙江电力,2012(8):21-24,62.
[4]金宇,邱凯翔.一种直流系统接地故障排查方法的研究与分析[J].电工电气,2017(6):21-24.
[2]童诗白,华成英.模拟电子技术基础[M]. 3版.北京:高等教育出版社, 2005.
[3]聊方伦.直流系统接地对保护控制及开关量输入回路的影响分析[J].浙江电力,2012(8):21-24,62.
[4]金宇,邱凯翔.一种直流系统接地故障排查方法的研究与分析[J].电工电气,2017(6):21-24.