摘要
中性点不接地系统发生单相接地故障时,故障电流只是各元件对地电容所流过的电流。通过分析电容电流的分布情况及其系统电压的变化,对取得的零序电流和零序电压的幅值及方向进行判定,可以确保接地故障检测元件对方向能正确识别。此外还介绍了继电保护在系统中的应用,并针对系统保护存在的薄弱环节提出了解决方案。
When single -phase earth fault happens in isolated neutral system, the fault current is just the current flowed by direct earth capacitance of each part. Based on analysis of the distribution situation of capacitance current of isolated neutral system and the change of voltage, the amplitude and direction of zero - sequence current and voltage detected were determined to ensure the earth fault detecting parts could identify the direction. In addition, application of relay protection in the system was introduced, and resolutions for the weak points in the system were raised as well.
出处
《石油化工技术与经济》
2014年第1期36-41,共6页
Technology & Economics in Petrochemicals
关键词
中性点不接地系统
单相接地
零序
方向判定
应用
isolated neutral system, single - phase earth fault, zero - sequence, direction determination, application
