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一起电缆故障后继电保护动作行为分析及改进

Analysis on Action Behavior of Protective Relay against an Actual Cable Failure and Countermeasures

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对某水电站10 kV厂用电电缆接头故障后继电保护动作行为进行了分析,介绍了保护装置接地零序电流采样错误、保护动作死区等问题的发现方法,以及调整电缆零序CT安装位置、优化10 kV母线进线断路器安装位置、增加带电显示装置等有效解决措施.
This paper analyzes the action behavior of protective relay after an actual event of internal 10 kV electrical cable joint failure in a hydropower plant. It reports methods of observing the problems such as sampling errors of grounding ze-ro-sequence current of protective relays,protective action dead zone,etc. It also proposes effective countermeasures inclu-ding adjusting cable zero-sequence CT installation position,optimizing installation position of 10 kV bus incoming circuit breaker,and adding live display devices.

cable failureprotective actionaction dead zoneinstrument transformercircuit breaker

卢伟、贾同威、陈相宇

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雅砻江流域水电开发有限公司,四川 成都 610051

电缆故障 保护动作 动作死区 互感器 断路器

2024

电工技术
重庆西南信息有限公司(原科技部西南信息中心)

电工技术

影响因子:0.177
ISSN:1002-1388
年,卷(期):2024.(7)
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