三相异步电动机过负荷保护的配置及定值设置分析

Analysis of the Overload Protection Configuration and the Setting for Three-phase Asynchronous Motor

以电动机过负荷保护动作造成机组停运事件为例,分析现场普遍存在的电动机过负荷保护偏重保护电动机安全,未充分释放电动机过负荷能力,对系统造成的危害。研究电动机过负荷保护配置及过负荷保护定值设置,提出改进建议及有效措施,在保证电动机安全的基础上,防止重要电动机过早切除导致经济损失。

Taking three motor overload protection actions caused by the power-generating unit fault as an example,the motor overload protection prevailing on the spot to protect the safety of the motor and not fully release the overload capacity of the motor which would harm the system was analyzed.The motor overload protection configuration and overload protection value setting were studied.The improvement suggestions and effective measures were proposed.On the basis of ensuring the safety of the motor,the economic loss caused by the premature removal of the important motor was prevented.