Maintenance and Testing of Protective Devices

CIM Bulletin, Vol. 70, No. 787, 1977

W. E. Lockley, Manager, Field Service, Westinghouse Canada Limited, Toronto, Ontario

This paper will attempt to answer a number of questions which are important to the safe and continued operation of an electric power system. 1. WHY should electrical protective devices be tested? 2. WHAT devices should be tested? 3. WHEN should they be tested? 4. HOW should they be tested? 5. WHO should test them?
Keywords: Equipment, Maintenance, Testing, Protective devices, Safety, Electrical equipment, Circuit breakers, Relays.