In production to preventThree-phase asynchronous motorOverload causes damage, the usual measure is to add an overload protection element; Motor overload refers to the operation of greater than the rated current, but the overload current exceeds the rated current multiple is smaller, usually maintained at the rated current1.5Within a times. followMori machineXiaobian together to understand the content of overload protection.

       There are many reasons for motor overload, such as sudden increase in load, phase loss operation and grid voltage reduction. ifThree-phase asynchronous motorLong-term overload operation, the temperature rise of the winding will exceed the allowable value so that the insulation material becomes brittle and aging, the relative life will be shortened, and serious damage will be caused.

       General requirements Overload protection devices are required to have inverse time characteristics and will not be affectedThree-phase asynchronous motorShort-time overload impulse current or short-circuit current and instantaneous action, so we usually use thermal relays as overload protection devices. When reach6When more than the rated current overheat relay is required5It takes about two seconds to act, because before the thermal relay does not act, the heating element of the thermal relay may burn out first, so when we use this protection device for overload protection, we need to install a fuse or a short-circuit protection device of a low-voltage circuit breaker.

       Note: The overload protection characteristics are different from the current protection characteristics, so the current protection method cannot be used for overload protection.

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