对模故障分量选相元件的一些探讨

Studies on Phase-Selector Based on Modal Transformation and Fault Component

根据故障时系统参数的可能变化详细分析了模故障分量选相元件在各种类型故障情况下的性能 ,通过与相电流差突变量选相元件的比较 ,指出 ,对于实际故障 ,该选相元件并不能达到理论上的选择性 ,而且其在弱电源侧依然存在灵敏度不足的问题 ,但整体性能比前者稍优。在全面分析的基础上 ,提出了一种新型的选相方案。最后 ,利用EMTP仿真验证了新方案的有效性。

The behavior of a modal transformation based on fault component phase selector are discussed in detail with regard to the changes of the system parameters and fault types.In contrast to the phase selector using superimposed line current,it is figured out in this paper that this phase selector still can't attain the theoretic selectivity for a real fault,furthermore,the sensitivity still may be deficient when the relay is located on the side of weak source.However,the integral performance of this phase selector is slightly better than that of the phase selector based on superimposed line current.Thereby,a new scheme of phase selection is proposed.The effectiveness of the scheme is verified with the EMTP simulation.