Study on Very Fast Transient Electromagnetic Interference Model under GIS Disconnector Operation

作者：Yan Ye, Jin Zhou, Jianqiong Zhang · 年份：2023 · DOI：10.1109/icet58434.2023.10211976 · 被引用次数：5 · 研究领域：High-Voltage Power Transmission Systems、Lightning and Electromagnetic Phenomena、Fire effects on ecosystems

In the context of the reverse distribution of power resources and demand in China, gas-insulated substations (GIS) are widely used as power transmission equipment in UHV power transmission projects in my country. When the disconnector in GIS performs the opening and closing operations, multiple arcing will occur between the dynamic and static contacts, resulting in a very fast transient overvoltage (VFTO) with the characteristics of high frequency, high amplitude and fast rise. In addition, it will also cause a very fast transient overcurrent (VFTC), resulting in changes in the transient magnetic fields, which will affect the operation of secondary equipment. Therefore, this paper investigates the formation mechanism of VFTO and VFTC in UHV GIS equipment, the waveform characteristics and the factors affecting the very fast transient process. First, the principle of arc re-ignition caused by disconnector operation in GIS is explained, and the formation mechanism of VFTO and VFTC and their respective transient characteristics are analysed. Based on the one-dimensional transmission line simulation theory, the existing simulation methods and the electromagnetic transient equivalent model of the disconnector in GIS are studied. The basic concepts, differences and applicability of various arcing resistance models for simulating the operation of disconnectors are analysed, and the exponential arcing model is selected for the simulation calculation of the models. The reason for selec...