三相异步交流电动机电流不平衡报警保护电路的设计

Design of Alarm and Protection Circuit for Unbalanced Current of Three-phase Asynchronous AC Motor

三相异步交流电动机出现故障时常伴随着三相电流不平衡的现象,电动机三相电流不平衡的数值是监测电机的重要指标。文章介绍了三相电流不平衡产生的原因,设计了电动机电流不平衡报警保护电路,当检测数值超过标准值时及时报警、超过临界值时自动保护,实现对电动机的保护作用。

Three-phase asynchronous AC motors are often accompanied by three-phase current imbalance when they fail.The value of the three-phase current imbalance of the motor is an important indicator for monitoring the motor.The causes of unbalanced three-phase currents were introduced.The motor current imbalance alarm protection circuit was designed.When the detected value exceeded the standard value,it would alarm in time and automatically protect when it exceeded the critical value to realize the protection of the motor.