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

By IEEE

ISBN-10: 0738149780

ISBN-13: 9780738149783

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

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There are special test sets available for this purpose that inject currents and voltages, as necessary, and time the various operations of the relays. This type of testing is usually performed by a technician who specializes in this area. Depending upon the relay to be calibrated, quite complex test equipment may be required and in-depth training in protective relaying may be needed to properly set the relay. Copyright © 1998 IEEE. All rights reserved. 2 Low-voltage circuit breakers Low-voltage circuit breakers come in the following three major types: a) b) c) Power (air-frame) circuit breakers; Molded-case circuit breakers; Insulated-case circuit breakers.

It is through this process that the root cause can be determined. There are engineers that specialize in forensic and failure analysis. These people, through their experience, are generally able to recognize failure patterns and to draw accurate conclusions much more readily than the untrained person. This is a specialty that is generally contracted when Þrms do not have that capability in-house. 5 Inspection and test frequency Equipment in a critical service would generally receive maintenance attention more frequently than other equipment.

In many instances, electronic equipment uses its own metal frame or case as the signal reference. The NEC [B53] requires the outside of metal enclosures of electrical equipment to be bonded to power system ground (by the use of Òequipment grounding conductorsÓ) to prevent shock hazards. Therefore signal reference is connected to power system ground. The objective becomes the design of a grounding system so that the signal reference does not pick up stray ground currents from the distribution system, thereby causing operating problems for the electronic equipment.

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


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