Download IEEE Std 902-1998 Guide for Maintenance, Operation & Safety by IEEE PDF

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Extra info for IEEE Std 902-1998 Guide for Maintenance, Operation & Safety of Industrial & Commercial Power Systems

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4 Analytical tests Analytical tests address speciÞc aspects of a piece of equipment or system under test. The tests are usually more specialized to the equipment under evaluation and may utilize test equipment that is designed for that speciÞc test. 1 Winding and contact resistance Winding and contact resistance are similar in that both are looking for a very low ohmic value, since they are measuring the ÒresistanceÓ of a component that is supposed to conduct electricity. A Kelvin Bridge has long been a standard method of measuring low values of resistance, and is still in use today.

Time travel analysis, dissolved gas analysis, infrared, and contact resistance); Grounding tests; Functional tests. Chapter 10 describes each of these tests in detail. 26 Copyright © 1998 IEEE. All rights reserved. 2 Repairs Repairs can be categorized by their sense of urgency. Some repairs must be accomplished before the equipment can be returned to service. Other repairs may require material items that are not stocked, and cannot be accomplished until those items have been received and properly installed.

This document not only helps plant maintenance personnel evaluate the suitability of protective devices for safely interrupting fault currents that can occur in the plant, but also gives the information that is necessary to set adjustable circuit breakers and protective relays to provide for the optimum selectivity. Proper coordination will minimize plant power outages in the event of equipment failure. 1 Inspection and testing The condition of electrical equipment is generally affected by the atmosphere and conditions under which the equipment is operated and maintained.

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