Abstract This article aims to determine a proper voltage rating known as the withstand capability of HV equipment in a 115 kV air insulated substation in Thailand because some of the HV equipment were severely damaged by high switching transient overvoltages. Then, this case was investigated by using a simulation model in the ATP/EMTP. Actual data acquired from all the equipment or derived from physical dimension of equipment was used as input parameters in the simulation model. In different switching operation cases as load rejection, earth-fault, capacitor bank switching etc., the maximum overvoltage was obtained from the simulation and subsequently applied in the insulation coordination procedure. The systematic modeling to evaluate electrical stress and insulation coordination process were thoroughly expressed to simplify the process for utility applications. Finally for this 115 kV substation, the short duration withstand voltage of 275 kV and the lightning impulse withstand voltage of 650 kV were selected from the insulation coordination and practically applied to determine the minimum electrical clearance of HV equipment for both phase-to-earth and phase-to-phase distances.

中文翻译：

---

基于电应力情况的绝缘配合确定高压绝缘强度

摘要 本文旨在确定泰国 115 kV 空气绝缘变电站中高压设备的适当电压额定值，即高压设备的耐受能力，因为某些高压设备因高开关瞬态过电压而严重损坏。然后，通过使用 ATP/EMTP 中的模拟模型来研究这种情况。从所有设备获取的实际数据或从设备的物理尺寸导出的实际数据用作模拟模型中的输入参数。在甩负荷、接地故障、电容器组切换等不同的切换操作情况下，最大过电压是从模拟中获得的，随后应用于绝缘协调程序。评估电应力和绝缘协调过程的系统建模被彻底表达，以简化公用事业应用的过程。最后针对该115 kV变电站，从绝缘配合中选择了275 kV的短时耐受电压和650 kV的雷电冲击耐受电压，并实际应用确定了高压设备的相对地和相对地最小电气间隙。相间距离。