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Electrical Apparatus
The Magazine of Electrical &
Electronic Application & Maintenance

February 2005 

Below are listed featured articles from the February 2005 issue, Vol. 58, no. 2 © 2005 Barks Publications, Inc. ... see also February 2005 departments and columns and Previous issues.

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  Motor starting from 'isolated' power sources  When starting any a-c motor, especially larger ones, voltage drop at the motor terminals (caused by high starting current flowing through system impedances) is always a critical concern. This important article will explain the “captive transformer” scheme, through which a motor is directly connected to a secondary transformer, which closes the primary circuit and simultaneously energizes the transformer and starts the motor. We walk readers through the steps needed to accurately calculate voltage drop and discuss how to keep the captive transformer ready to withstand mechanical and thermal stresses, and current peaks. (Read a summary) (trilingual summary appears in the magazine)
  By Richard L. Nailen, P.E., EA Engineering Editor

• Greater efficiency for competitiveness abroad   In our February issue, we present the first of a two-page series previewing one of the year’s first major trade shows—the National Manufacturing Week Expo (including the Plant Engineering & Design shows), to be held March 7-10 at Chicago’s McCormick Place. This year's National Manufacturing Week focuses on how manufacturing and maintenance practices can help or hinder overseas sales. The February preview highlights seminar and conference offerings at the show (Part Two of our NMW preview, in the March issue, will feature show floor exhibits).
  Compiled by the EA Staff

• Deriving the stator thermal damage code    What's the relationship between the magnitude and allowable duration of short time overloads on an induction motor winding  That question arises in matching moor characteristics to those of protective devices such as fuses or relays, and in evaluating whether or not the motor can sustain occasional brief overloads without seriously reducing normal insulation life.
  By Richard L. Nailen, P.E., EA Engineering Editor
   

• What makes an accounting system 'good'?   Why managers can't afford to leave accounting entirely to the professionals
  By William H. Wiersema, CPA, EA Contributing Editor

• Carbon-based fibers improving pesonal protection technology    How flame resistance is being enhanced by advances in textile science
  By Richard B. Elsberry, EA Contributing Editor 

See also February 2005's Departments, columns