大亚湾核电站盘车电动机保险熔断的根本原因分析及解决方法

The solution to avoid protection fuses’ failure of the driving motor of the turbine-generator set during its startup in Daya Bay Nuclear Power Station

以电动机转差率、电流、电压、电磁转矩的关系为理论基础,对盘车电动机的启动过程进行了分析,指出了盘车电动机投运时保险熔断的根本原因,并针对分析结果,提出了采用降压启动或变频启动的解决方法。

Based on a detailed analysis of the inter-relationship in the current, voltage, electromagentic torque and ratio of the difference between the speed of rotor and the speed of rotary magnetic field to the later in the motor, it is showed that the root cause which leads to the protection fuses~ failure of the motor in the starting stage, which drives the turbine-generator set to rotate at low speed before its startup. Two solutions to avoid the situation are proposed, too.