10kV配电变压器非全相运行引发事故的分析及保护措施

Analysis and Protection Measures of 10kV Distribution Transformer Caused by Non-Full-Phase Operation

分析了10kV配电变压器在运行中因一相跌落式开关脱落,造成三相异步电机烧毁事故的原因。为防止类似事故再次发生,提出在三相重要动力负荷的电源侧加装一套三相电压平衡保护装置,一旦发生三相电源非全相运行,及时、准确跳闸,保证用电设备的安全运行。

This paper analyzed the causes of three-phase asynchronous motor overburning due to one-phase switch falling off,when 10 kV distribution transformer operated, in order to prevent similar accidents, the three-phase voltage balance protection device was installed in the power load side of three-phase power. If the non-full-phase operation of the three-phase power occurs, the three-phase woltage balance protection device can timely and accurately trips, which ensures the safe operation of electric equipments.