NDLI: Real-Time Sag Monitoring System for High-Voltage Overhead Transmission Lines Based on Power-Line Carrier Signal Behavior

Content Provider	IEEE Xplore Digital Library
Author	de Villiers, W. Cloete, J.H. Wedepohl, L.M. Burger, A.
Copyright Year	1986
Abstract	A new method of measuring the change in the average height above ground of horizontal high-voltage overhead transmission-lines (OHTLs) phase conductors is introduced. The new technique, called power-line carrier sag (PLC-SAG) for short, determines average overhead conductor height variations in real time by correlating sag with measured variations in the amplitude of signals propagating between power-line carrier (PLC) stations. The multifrequency PLC-SAG monitoring signals are injected onto the operational PLC system in the 50- to 500-kHz band, but without interfering with the operational integrity of the PLC teleprotection system. The feasibility of the method was examined using the theory of natural modes for multiconductor systems, and tested by extensive field experiments on two horizontal 400-kV lines operated in South Africa by Eskom. It is concluded that the average height of a horizontal OHTL can be tracked accurately for continuous periods by the PLC-SAG technique.
Sponsorship	IEEE Power Engineering Society
Starting Page	389
Ending Page	395
Page Count	7
File Size	498840
File Format	PDF
ISSN	08858977
Volume Number	23
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Real time systems Monitoring Power transmission lines Programmable control Conductors Transmission line measurements Phase measurement Transmission lines System testing Africa real-time OHTL average sag monitoring Ampacity modal analysis and cancellation overhead transmission-lines (OHTL) sag power-line carrier (PLC) signal attenuation
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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Effects of Segmented Shield Wires on Signal Attenuation of Power-Line Carrier Channels on Overhead Transmission Lines—Part I: Modeling Method

Effects of Segmented Shield Wires on Signal Attenuation of Power-Line Carrier Channels on Overhead Transmission Lines—Part II: Signal Attenuation Results Analysis

Accurate ampacity determination: temperature-sag model for operational real time ratings

A new method for real-time monitoring of high-voltage transmission-line conductor sag

Using Modal Analysis to Estimate Received Signal Levels for a Power-Line Carrier Channel on a 500-kV Transmission Line

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Tension and Ampacity Monitoring System for Overhead Lines

Closure on A new method for real-time monitoring of high voltage transmission line conductor sag

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Real-Time Sag Monitoring System for High-Voltage Overhead Transmission Lines Based on Power-Line Carrier Signal Behavior

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Effects of Segmented Shield Wires on Signal Attenuation of Power-Line Carrier Channels on Overhead Transmission Lines—Part I: Modeling Method

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