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Description : This newly revised and updated reference presents sensible approaches to the design, selection, and usage of high-voltage circuit breakers-highlighting compliance issues concerning new and aging equipment to the evolving standards set forth by the American National Standards Institute and the International Electrotechnical Commission. This edition features the latest advances in mechanical and dielectric design and application from a simplified qualitative perspective.
High Voltage Circuit Breakers: Design and Applications features new material on contact resistance, insulating film coatings, and fretting; temperature at the point of contact; short-time heating of copper; erosion and electromagnetic forces on contacts; closing speed and circuit breaker requirements; "weld" break and contact bounce; factors influencing dielectric strength; air, SF6, vacuum, and solid insulation; and dielectric loss and partial discharges, and includes updated chapters on capacitance switching; switching series and shunt reactors; temporary overvoltages; and the benefits of condition monitoring.

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Buy Best Building heat load contributions from medium and low voltage switchgear--part I: solid rectangular bus bar heat losses.(Report): An article from: ASHRAE Transactions

Building heat load contributions from medium and low voltage switchgear--part I: solid rectangular bus bar heat losses.(Report): An article from: ASHRAE Transactions by

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This digital document is an article from ASHRAE Transactions, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on July 1, 2009. The length of the article is 7435 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.

From the author: Heat dissipated by medium and low voltage switchgear is determined by use of a spreadsheet model. In the first part of this paper, mathematical models of a switchgear component that produces a significant portion of the total heat loss is examined. Rectangular bus bars are used in switchgear for carrying large current loads and the loss contribution of this one component is significant. The heat loss mechanisms of bus bars consist of eddy current loss, loss from proximity effect, and stray or enclosure loss. Each of these losses is considered in turn to develop a complete model of the bus bar loss process. Where possible, portions of the loss model are compared to information developed elsewhere with excellent agreement. The eddy current and proximity effect loss models are developed in such a way that the model allows evaluation with a spreadsheet. The same can be said for the stray or enclosure loss model. The goal of this work is to produce a switchgear power loss model suitable for use by HVAC engineers for heat load prediction.

Citation Details
Title: Building heat load contributions from medium and low voltage switchgear--part I: solid rectangular bus bar heat losses.(Report)
Author: Warren N. White
Publication:ASHRAE Transactions (Magazine/Journal)
Date: July 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 115 Issue: 2 Page: 369(13)

Article Type: Report

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