基于可变间隙电弧模型单相弧光接地故障仿真研究

Simulation Study of Single-phase Arc Fault Based on Variable Gap Arc Model

间歇性弧光接地会使非故障相产生过电压,对电网的绝缘性能有严重威胁,影响电网运行的稳定性,建立准确的电弧模型搭建单相弧光接地过电压是全过程仿真模型的基础与关键,为此,在Mayer和Cassie电弧模型及气体击穿理论基础上,提出了能够更为如实描述实际单相弧光过电压仿真的电弧模型。结合Mayer和Cassie电弧模型在描述电放电过程中不同的侧重点,建立了Mayer-Cassie联合电弧模型,再利用某35kV变电站数据进行PSASP和ETSDAC软件联合仿真,结果表明,可变间隙电弧模型能够适用于单相不接地系统的间歇性弧光接地故障模拟,可为处理单相弧光接地故障提供理论参考。

Intermittent arc grounding will lead the Fei fault phase causes overvoltage, which has seriously threat the insulation performance of the grid, affect the stability of the power grid operation, and establish cm accurate single-phase arc grounding overvoltage is the foundation and key of the simulation model of building arc model. Therefore, on the basis of Mayer and Cassie arc model and gas breakdown theory, the arc model which cm describe the actual single-phase arc overvoltage simulation is proposed. Mayer - Cassie combined arc model was established by combining Mayer and Cassie arc model in describing the electric discharge process, and a simulation ofPSASP and ETSDAC software was carried out using the data of a 35kV substation. The results show that the variable gap arc model can be applied to the simulation of intermittent arc grounding fault of single-phase ungrounded system, which can provide theoretical reference for the treatment of single-phase arc grounding fault.