Real Time Monitoring Of High Voltage Transmission Line Conductor Sag: The State- of-The-Art
Tlotlollo Sidwell Hlalele1, Shengzhi Du2
1T. S. Hlalele, The University of South Africa, Christiaan Pioneer Avenue, Florida, RSA.
2Shengzhi Du, Department of Electrical and Mining Engineering, University of South Africa, Florida, RSA.
Manuscript received on September 27, 2013. | Revised Manuscript received on October 12, 2013. | Manuscript published on October 30, 2013. | PP: 297-302  | Volume-3, Issue-1, October 2013. | Retrieval Number:  A2248103113/2013©BEIESP

Open Access | Ethics and Policies | Cite
© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (

Abstract: There have been developments in real time monitoring of a power transmission line system for the past and in recent years. This paper characterizes and evaluates various methods developed to measure conductor sag in real time. Some of the methods are still at initial stage of simulation and have not yet been applied in industry, while others are currently used by the power utility companies around the world. The optimum use of existing high voltage transmission lines requires a real time condition monitoring. In South Africa, detecting such critical infrastructure proactively in real time is still a challenge. We synthesis these methods and review the current power line carrier used by ESKOM South Africa. We conclude by drawing attention to the accuracy and strength of possible methods which could be applicable in future.
Keywords: Power quality, Reliability and Sag.