配电网单相接地电弧建模及仿真分析研究

为选择有效的配电网接地消弧措施及选线方法,有必要进行电弧建模及仿真研究。给出Cassie、Mayr、Schwarz、控制论等四种电弧模型的数学方程,其中Mayr、Schwarz、控制论等三种电弧模型适合描述接地电流较小的电弧的故障特征。建立Schwarz和控制论电弧仿真模型,并利用电弧特性测试电路对这两种模型做仿真对比分析。控制论模型因能直接设置弧长,直观地反映配电线路故障拉弧情况,更适用于谐振接地系统单相弧光接地故障仿真研究。采用ATP-EMTP软件建立谐振接地系统模型和控制论电弧模型,分析了不同电弧长度对电弧阻抗、接地电弧稳态和暂态特性的影响。仿真结果表明,利用控制论电弧模型可较直观且准确地仿真谐振接地系统弧光接地故障。

Modeling and simulation analysis of arc in distribution network

Studies on modeling and simulation of arc help to choose arc-extinction methods and line-selection methods in distribution network. Four kinds of arc mathematical equations are given such as Cassie, Mayr, Schwarz and the cybernetic model. Mayr, Schwarz and the cybernetic model are suitable for describing the arc characteristics when the grounding current is small. The arc model of Schwarz and the cybernetics is established, and these two models are compared using a test circuit of arc characteristics. The cybernetic model can set arc length, reflect the arc fault conditions and apply to simulation of single-phase arc grounding fault in resonant earthed system. The resonance earthed system model and the cybernetic model are established by ATP-EMTP, and the effect of arc length on arc impedance, steady and transient arc characteristics is analyzed. The results show that the cybernetic model is more intuitive and accurate to simulate arc grounding fault in resonant earthed system.