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Why can't I start my motor: Lessons learned from bad motor protective settings

机译:为什么我不能启动电动机:不良的电动机保护设置中的经验教训

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Motor management relays can enhance protection by locking out a motor after a trip or a stop until the motor has cooled enough to restart the motor. This feature enhances motor protection because it insures the start will not cause the motor temperature to exceed the thermal damage curve. As with any protective relay setting, correct settings are important, but with restart protection they can be particularly difficult due to the fact that they prevent restart of the process that is driven by the motor. Topics to be discussed in this paper include: motor hot-to-cold safe stall ratio, RTD biasing, learned motor starting data, motor thermal capacity starting margin, running cool time constant and stopped cool time constant. Each of these values will be discussed in detail and will be shown with a case study that unnecessarily prevented restart of a motor.
机译:电动机管理继电器可以通过在跳闸或停止后锁定电动机直到电动机冷却到足以重新启动电动机的程度来增强保护。此功能增强了电动机保护,因为它确保启动不会导致电动机温度超过热损坏曲线。与任何保护继电器设置一样,正确的设置也很重要,但是对于重新启动保护,由于它们会阻止由电动机驱动的过程重新启动,因此特别困难。本文要讨论的主题包括:电动机热-冷安全失速比,RTD偏置,学习到的电动机起动数据,电动机热容量起动裕量,运行冷却时间常数和停止冷却时间常数。这些值中的每一个都将详细讨论,并通过案例研究显示出来,以防止不必要地阻止电动机重启。

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