变压器缺相引起三相电机烧毁的原因及预防方法

Causes and Preventive Measures of Three Phase Motor Burning Caused by Phase Loss of Transformer

本文分析了10kV Yyn0型配电变压器高压侧发生缺相后低压侧各相电压的变化情况及造成三相异步电机烧毁的原因,提出在三相电机启停控制器加装一套三相电压平衡保护装置,分析其工作原理。在三相异步电机正常运行时一旦配电变压器高压侧发生缺相,三相电机启停控制器能及时保护,保证三相异步电机不被烧毁。

This article analyzes the voltage change of each phase at low voltage side after the 10kV Yyn0 distribution transformer lacks phase at high voltage side and the cause of three-phase asynchronous motor burning.A set of three-phase voltage balance protection device is recommended to be added to the three-phase motor start-stop controller,and its working principle is analyzed.In the normal operation of three-phase asynchronous motor,once the high-voltage side of the transformer has phase loss,the three-phase motor start-stop controller can timely protect the three-phase asynchronous motor from being burned.