AC Motor Protection

Usually dispatched in 2 to 3 days
Usually dispatched in 2 to 3 days
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Introduction
All electrical apparatus and systems need protective relays to monitor and initiate tripping in the case of short circuit current caused by faults and insulation failure. Indeed, ac motors are no exception to the rule and need overcurrent protection against short circuits from external faults in connecting cables and from internal faults in the motor windings. In addition, motors are thermally rated and limited, and protective relays must be applied to prevent overheating during operating conditions where no faults are present. In this respect, ac motor protection presents a unique challenge to the protection engineer and requires knowledge of both thermal and mechanical characteristics as well as electrical characteristics familiar to electrical engineers.

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