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供电电源断错相保护是交流供电起重机械重要的电气安全保护措施。其中,断相保护主要是为了防止因供电电源断相时造成电机断相运行而烧坏电机,从而有效避免可能发生的起重机机构失速事故。而错相保护则主要是为了防止因供电电源相序发生变化而造成如起升高度限位器、大车和小车运行机构限位器等安全保护装置失效,同
Power supply fault phase protection is the AC power supply crane important electrical safety precautions. Among them, the phase failure protection is mainly to prevent the power phase failure caused by motor phase-out operation and burn the motor, thus effectively avoiding possible crane body stall accident. The wrong phase protection is mainly to prevent changes in the phase sequence of the power supply as a result of lifting height limiter, carts and trolleys and other safety devices limiters failure, with