NDLI: The Ratings of Electrical Machines As Affected by Altitude

Content Provider	IEEE Xplore Digital Library
Author	Fechheimer, Carl J.
Copyright Year	1884
Abstract	The paper contains equations applicable to machines cooled by forced air convection currents. It is to be hoped that the A. I. E. E. Standards Committee will find some helpful suggestions in the paper. Ignoring differences in ambient temperature, the effect of altitude may be considered from two standpoints: (a) The change in temperature rise, the rating remaining the same; or (b) the change in rating, the temperature rise at a given altitude equaling that at sea-level. The applications of both are considered, and equations are solved in both ways. The difference in ambient temperature at sea-level and at altitude is also taken into consideration in other equations. The present A. I. E. E. rule is known to be faulty, applies only on the basis of temperature change, and starts at 1000 meters. These and other objections are believed to be met in this paper. Several of the equations are plotted in families of curves, which should be of assistance to the reader. By assuming other values for some of the factors, other similar curves can be drawn. In Appendix I, the derivations of equations are given. Appendixes II and III cover discussions of two of the factors used in the equations. In Appendix IV, some cases other than a slotted core are discussed.
Starting Page	354
Ending Page	364
Page Count	11
File Size	2653560
File Format	PDF
ISSN	00963860
Volume Number	XLV
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1926-01-01
Publisher Place	New York, U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Equations Machinery Stator cores Copper Resistance heating Heat engines Conductivity Contacts Cooling
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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