The idea that had protective to electric machinery in the past is use fuse, shed relay, hot relay, constant temperature too implement etc, but these method have advantages and disadvantages each. To electric unit this kind changes bear equipment, infallible protective method is done not have. Accordingly, must take all sorts of combination, baconian rise have two kinds: The increase and decrease that is electric current of pair of electric machinery input undertakes judging; 2 it is calorific to electric machinery itself circumstance undertake judging. These two kinds of means, no matter the sort of should consider electric machinery thermal capacity given time surplus.
Normally, the basic protection method that passes negative charge is: Cross bear protection to electric machinery runs continuously or nodding those who move an operation, use constant temperature implement; To the protection of electric machinery locked-rotor, use hot relay; To short circuit accident, use fuse or shed relay too.
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