比较工作电压相位法在距离保护中的应用研究

Application research on method of working voltage phase comparison in distance protection

介绍了比较工作电压相位法距离保护的原理及应用,并通过与传统的方向阻抗特性和偏移阻抗特性距离保护进行的比较,从其保护原理和相位比较方程以及不同方向故障时的保护特性,阐述了比较工作电压相位法距离保护对线路出口短路和反方向出口短路时的严格方向性,提出了用正序电压作为参考电压并配以低电压状态距离保护判据的比较工作电压相位法距离保护,可以完全满足目前电网对距离保护选择性和速动性的要求.

The paper discusses the principle and application of working voltage phase comparison method of distance protection. From the principle of protection, phase comparison equation and protection characteristics of different direction faults, the strict directivity of working voltage comparison method is described when outlet short circuit of line and opposite direction short circuit happen by comparing with characteristics of traditional direction impedance and migration impedance of distance protection. The working voltage comparison method of distance protection that takes positive voltage as reference voltage and is fitted with protection criterion of low voltage distance protection can fully meet the demand of the current electric network in distance protection＇s selectivity and fast operation.