IEEE Std 902-1998 Guide for Maintenance, Operation & Safety by IEEE
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Extra resources for IEEE Std 902-1998 Guide for Maintenance, Operation & Safety of Industrial & Commercial Power Systems
With dc insulation testing, the capacitance of the insulation charges up over time and the residual leakage current is an indication of the resistance of the insulation. This is not true of ac insulation testing. Since the voltage is changing at 60 Hz, the leakage current may be predominantly the capacitive charging current of the insulation under test. For this reason, ac hi-pot testing is usually a pass/fail type test in which ÒpassingÓ means that the insulation was capable of holding the required test voltage, usually for 1 min.
Problems can then be corrected while the circuit is intentionally shut down, thus avoiding an in-service failure that could interrupt production. It is important to remember that the necessary material, such as splice kits or 32 Copyright © 1998 IEEE. All rights reserved. MAINTENANCE TESTING OVERVIEW IEEE Std 902-1998 cable terminations, should be available to facilitate repairs should the cable fail during testing. 2 AC tests The most common ac insulation test is ac hi-pot testing at 60 Hz. The capacitance of the insulation is a large factor in ac testing.
Financial issues should be considered when evaluating the need for continuous electrical power. These factors will help to dictate the level of importance that a facility places on a preventive maintenance program. The cost of downtime or lost production, and how that can be minimized through effective maintenance, also should be considered. A complete survey of the plant should be performed. This survey should include a listing of all electrical equipment and systems. The equipment should be listed in a prioritized fashion in order to distinguish those systems or pieces of equipment that are most critical to the operation.