NDLI: Ice Testing and Its Influence Upon Switch Design

Content Provider	IEEE Xplore Digital Library
Author	Heberlein, G. E. Field, E. J.
Copyright Year	1884
Abstract	Requirements for disconnecting switches to operate when ice-coated demand special attention to details of design and to methods of testing the performance of a given design. In order for an ice test to provide a true criterion of the performance of a design, the icing program must be preceded by a wetting period above freezing temperatures, the simulated rain must be uniform over the test area, and the volume of water must be in balance with the ambient temperature in order to permit continuous wetting of the surfaces upon which ice is forming. Operation tests should be made at 20 degrees Fahrenheit and adequate time should be allowed after ending the spraying to equalize the masses of ice and metal at this temperature. Based upon the observed results of almost 100 individual ice tests, it is found that rounded contours, generous clearances, dry sealed bearings, small radii of all rotating members, sealed and enclosed hinge contacts, high-pressure line contacts, optimum clearance at linkage points, and absence of compression points are all required to maximize the ability of a disconnecting switch to be operated when coated with ice.
Starting Page	37
Ending Page	44
Page Count	8
File Size	5170737
File Format	PDF
ISSN	00963860
Volume Number	70
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1951-07-01
Publisher Place	New York, U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switches Testing Temperature Contacts Design methodology Rain Ice surface Spraying Fasteners Couplings
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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