谐振接地系统单相故障仿真与分析

Simulation and Analysis of Single-phase Grounding Fault in Resonant Grounded Systems

中性点谐振接地是我国配电网广泛采用的接地方式。针对谐振接地系统中最常发生的单相接地故障,在Matlab的Simulink仿真环境下搭建仿真模型。并针对10 kV系统在不同故障距离、不同故障初相角以及不同过渡电阻情况下的单相接地故障做了大量仿真,对比分析了相应稳态特征量和暂态特征量的变化规律。仿真结果表明,不同故障距离、不同故障初相角和不同过渡电阻对稳态及暂态过程均有不同程度的影响。仿真分析为进一步进行谐振接地系统单相接地故障的故障选线和测距提供了理论依据。

The resonance grounding system is widely used for distribution networks in China. A simulation model is established based on MATLAB Simulink simulation environment. And a lot of simulationsare made on singlephase ground fault under different fault distance, different fault initial phase angle and different transition resistance. It compares and analyzes the variation of corresponding steady-state and transient characteristics. Simulation results show that different fault distance, different fault initial phase angle and different transition resistance have impacts of varying degrees on steady-state and transient processes. It provides a theoretical basis for further fault line selecting anddistance measuring to resonance grounding system single-phase ground fault.