正序故障分量方向元件误动的原因分析及其对策

文中简单介绍了正序故障分量方向元件的判别原理,给出了该方向元件在保护装置中比较详细的判向流程,深入分析了现场某次故障中该方向元件将正向故障误判为反向的原因,并给出了解决方案。新方案的物理意义明确,实现方法简单,对正反方向元件都有较高的灵敏度,提高了反方向元件的动作可靠性,能可靠防止上述故障事例中的误判向现象。新方案中的判据同样适用于负序、零序功率方向元件,且其已通过一系列有针对性的动模试验的验证,用于保护现场。

Maloperation analysis of positive sequence fault components based directional relay and its countermeasure

The principle of positive sequence fault components based directional relay is briefly introduced. The flow chart of the directional relay in real environment is presented. Testing the fault recording data from field operation show that the directional relay may work improperly, and an effective solution specially for the maloperation of the directional relay is put forward. The proposed measure is simple and has a clear physical meaning. On the basis of enough sensitiveness for the relay, the reliability of backward directional relay is improved greatly without any maloperation mentioned above. The proposed criterion is also applied to negative and zero sequence directional components. The technique is evaluated with the dynamic simulation results, and it has been adopted in engineering applications. This project is supported by Research Fund for the Doctoral Programme of Ministry of Education of P.R. China(No.20010698015).