110 kV线路距离保护的复合选相元件

准确有效的选相元件是高压输电线路采用单相自动重合闸的前提。该文通过分析目前微机保护中选相元件的不足,提出了电压电流突变量选相元件、电压电流序分量选相元件结合阻抗元件、方向元件以及瞬时值判断元件相结合的复合选相元件,能够准确地判断故障类型及故障相别。大量的PSCAD仿真表明其较好的准确性,是高压线路实现单相重合闸较为理想的选相元件。

Complex selector for the distance protection of 110 kV transmission line

When adopting the technique of single-phase automatic reclosing in EHV/UHV transmission line protection,fault phases should be selected correctly in advance.By analyzing the defects of selector in computer protection,this paper proposes the complex fault phases selector combined with voltage-current abrupt discontinuous components fault phases selector,voltage-current sequence components fault phases selector with impedance components,direction components and instantaneous value estimation components.It can correctly identify the fault type and fault phase.Lots of PSCAD simulations indicate it is a better selector with correctness for single-phase automatic reclosing in HV transmission line.