非有效接地电网单相电弧接地故障的建模及仿真

Modeling and Simulating of Single-phase Arc Grounding Fault in Non-effective Earthed Networks

单相电弧接地故障是中压配电网中的主要故障形式,建立准确的接地电弧模型对于故障分析是十分必要的。文中比较了现有的几种电弧模型的优缺点,在基于弧隙能量平衡理论的动态电弧模型的基础上建立了接地电弧模型,在PSCAD平台上构建了10kV配电网模型及接地电弧模型。通过与实际实验波形的比较,表明接地电弧模型能有效地反映接地电弧的性质。然后将此模型用于仿真2种不同的间歇性电弧接地故障,其过电压倍数符合实际情况,从而间接证明了接地电弧模型的正确性。

The single-phase arc grounding fault is a main fault form in medium voltage distribution networks. It is essential to build an accurate grounding arc model for fault analysis. In this paper, several existing arc models are compared and a new grounding arc model is built based on the dynamic arc model with the arc gap energy-balance theory. And then a model including 10 kV distribution networks and the arc grounding fault model is established with PSCAD. Comparing the simulation waveform with the experimental waveform, the results show that this model can reflect the characteristics of arc grounding fault effectively. Then this model is used to simulate two different intermittent arc grounding faults, the result shows that their over-voltage multiple is compliance with the actual situation, which proves the validity of the arc grounding fault model indirectly.