NDLI: Protection of pilot wires from induced potentials

Content Provider	IEEE Xplore Digital Library
Author	Killen, R. B. Law, G. G.
Copyright Year	1931
Abstract	The use of pilot-wire relays for protection of power transmission circuits usually requires a reliable pilot channel which is free of any induced potentials which may cause transient voltages to appear between wires even though they may be of relatively low magnitude. This is particularly true in the case of pilot relays using a sequence network in which a single-phasealternating voltage is applied to the pilot wires. Conventional methods of protection, such as those used on telephone circuits, are not suitable. As a result it frequently has been necessary to install special pilot circuits which are insulated for voltages far in excess of their normal operating voltage to insure reliable operation. This paper describes a method of protection which provides reliable and satisfactory operation of a-c pilot channels through low-voltage telephone-type cable, even though the cable may be subject to induced potentials high enough to operate discharge gaps.
Starting Page	267
Ending Page	270
Page Count	4
File Size	946526
File Format	PDF
ISSN	00959197
Volume Number	65
Issue Number	5
Language	English
Publisher	American Institute of Electrical Engineers
Publisher Date	1946-05-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wires Relays Electric potential Substations Power cables Circuit faults Voltage measurement
Content Type	Text
Resource Type	Article

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