中性点非有效接地系统单相接地故障等值电路分析

Single Line to Ground Fault Equivalent Circuit Analysis in Non-Effectively Grounded Distribution Networks

配电网单相接地故障频发,针对中性点非有效接地配电网,进行了单相接地故障网络分析。分析了传统的基于集中参数单相接地故障等值电路的不足,给出了基于分布参数的单相接地故障等值电路及其参数计算方法。分析了单相接地故障下的暂态分量,利用微分方程分析方法给出了类工频分量的表达式,提高了单相接地故障等值电路的适用性。

The single line to ground fault occurs frequently in distribution networks. This paper focuses on non-effec- tively grounded distribution networks. The single line to ground fault is analyzed in this paper. The disadvantages of lumped parameters equivalent circuit are discussed. Based on that, the new fault equivalent circuit of distributed pa- rameters is proposed, in which the parameter calculation methods are also established. The transient components of single line to ground fault is analyzed. Quasi power frequency component is mathematically expressed by solving dif- ferential equations. The feasibility of single line to ground fault equivalent circuit is enhanced.