大功率电机投切过程冲击电流仿真分析

大功率电机电源短暂中断后又重合闸恢复供电现象是普遍存在的,而大功率电机投切过程带来的瞬态冲击电流问题危害严重.根据某公司试验站实际情况和给定的相关参数,对两种大功率电机投切方式进行PSCAD建模与仿真,旨在分析投切过程所引起的冲击电流水平,以及冲击电流与投切时间的关系.结果表明:直接投切到三角形绕组支路模式比直接投切到备用支路模式产生的冲击电流更大,而且两种模式都不建议直接投切大功率电机,若直接投切,必须采取相应的安全措施,更换相应保护设备.

The Simulation Analysis of Transient Inrush Current Caused by Switching Process of High-power Motor

The phenomenon that brief interruption of electrical power and restoration of power supply after reclosing is widely spread, and the transient inrush current problems caused by switching process of high-power motor are serious. According to actual wiring of some experimental station in Shanghai and the given parameters, based on inrush current simulation during the switching process, two models of high-power motor switching are built in PSCAD, aiming at analyzing inrush current levels caused by switching process, as well as the relationship between inrush current and switching time. The results show that current generated by the direct switching to the triangle winding branch is larger than the alternative one, and neither direct switching high-power motor models is suggested. If any necessary, some safe measures should be taken to replace the corresponding equipment