一起20 kV线路故障的分析与对策

摘要

This paper introduces a three-phase short-circuit fault on 20 kV lines, which caused bus voltage sag of different 110 kV substations in the same supply area, resulting in tripping of low-voltage equipment of users integrated into the substation who have higher requirement on voltage quality. The paper analyzes the reasons in detail and presents solution to such similar abnormalities.%介绍一起20 kV线路三相短路故障，引起同供区不同110 kV变电站母线电压暂降，导致接入该变电站对电压质量要求较高的用户低压设备跳闸的事件经过；详细分析其原因，并对防止类似异常提出了解决方案。