基于选相合闸技术的变压器励磁涌流的仿真分析

Analysis and Simulation of Power Transformer Inrush Current Based on the Phase Selection Switch Technology

变压器空载合闸过程中产生的励磁涌流,易使变压器继电保护误动作,也会对变压器设备和电网产生不利影响。相对于多种外部措施限制涌流的方法,选相合闸技术可以更有效地削减励磁涌流。笔者从变压器空载合闸的暂态过程着手,针对励磁涌流进行了理论计算分析和仿真分析,通过分析验证了相关方法减小和抑制励磁涌流的效果和存在的局限性,结果表明变压器选相合闸的方法能够最有效消除励磁涌流,从而减小对系统的冲击;同时针对同步开关技术的误差时间进行了分析仿真,结果表明合闸的时间误差需要控制在0.5 ms以内。

Drowning the no-load closing process, transformer will produce a magnetizing inrush current which will make the transformer relay malfunction and make adversely affect to the transformer equipment and power grid. Relative to a variety of external measures limiting the inrush current, the phase selection switch technology is more effective to reduce inrush current. This paper calculates and simulates the transient process of no-load closing for magnetizing inrush current. It verifies the effect and limitations of several ways to reduce the inrush current, which determine the phase selection switch method the well suited way to reduce the inrush current. This paper also analysis and simulates the error time of phase selection switch method,which shows the closing error time should controled in less than 0.5 milliseconds.