NDLI: Optimum Message Transfer Rate for Distribution Feeder Protection Operating over Switched Telephone Networks

Content Provider	IEEE Xplore Digital Library
Author	Li, H. Y. Crossley, P. A.
Copyright Year	1981
Abstract	Distribution feeder protection relays require reliable and low-cost communication channels. The reliability in sending protection messages over a private or a public switched telephone network (STN) and the associated communication time delay are considered in this paper. The reasoning used to determine the optimum message transfer rate for a numerical current differential relay used for distribution feeder protection is described. A communication channel testing facility was developed and used to measure the time delay necessary to reliably send a protection message over an STN channel operating at different modem data rates. The paper presents and discusses the results obtained and shows how they can be validated using an analytical expression for data transfer reliability. For the defined current differential message frame, test results show that the selected data speed maximises channel reliability and minimises channel delay.
Starting Page	60
Ending Page	60
Page Count	1
File Size	322307
File Format	PDF
ISSN	02721724
Volume Number	22
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-03-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protection Telephony Communication switching Protective relaying Telecommunication network reliability Communication channels Delay effects Testing Time measurement Modems optimum message transfer rate selection Numerical current differential feeder protection switched telephone network
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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