摘要
对变压器空载启动时励磁涌流的产生机理进行了分析,说明影响变压器励磁涌流幅值的因素有合闸电压、合闸角及剩余磁通,而其衰减速度与时间常数有关,时间常数越大,励磁涌流衰减越慢。通过在Simulink平台上搭建变压器空载启动模型,分别仿真分析了合闸电压、合闸角、剩余磁通及时间常数等对110 kV变压器和220 kV变压器励磁涌流幅值及衰减速度的影响情况。认为在进行变压器充电保护定值整定计算时,通过设置保护动作时限,可以保证变压器启动充电过程中既能可靠躲过励磁涌流的影响,又能使变压器保护具有足够的灵敏度,提高变压器运行的安全稳定性。
The causes and influencing factors of inrush current during no-load startup of transformer were summarized,and the influence factors of the inrush current amplitude and decay rate of the transformer were simulated by using Simulink platform.It was considered that it could be ensured by setting the time limit for the protection of the transformer,not only protected the magnetizing inrush current,but also the protection with enough sensitivity while setting transformer protection.
出处
《内蒙古电力技术》
2015年第5期68-71,共4页
Inner Mongolia Electric Power
关键词
变压器
励磁涌流
保护定值
仿真
空载启动
保护灵敏度
transformer
magnetizing inrush current
protection setting value
simulation
no-load startup
protection sensitivity
