Selection and calculation of circuit breaker for motor protection
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Circuit breakers for motor protection can be divided into two categories:
1) The circuit breaker is only for protection and not for normal operation.
2) The circuit breaker is used for both protection and infrequent operation.
Selection principle:
(1) Isd = In
Where ISD -- setting value of long delay current, a;
In -- rated current of motor, a.
(2) Instantaneous setting current in
1) When protecting cage asynchronous motor
2)Protection of wound rotor asynchronous motor
