Track 2 Session 10

9:00 to 10:00 a.m. Friday, October 22, 2010

Application of Reliability Analysis for the Assessment of a Transmission Line Protection System

In Malaysia, high voltage transmission overhead lines that carry 132kV, 275kV and 500kV voltage levels serve as an important backbone for the country's electrical power supply. These overhead lines are made of aluminum alloys and are exposed to the outside environment. In addition to that, these lines are exposed to external threats such as lightning, flora and fauna encroachments, manmade activities, etc. To protect the lines from such threats, a line protection system is designed and implemented by power utility companies. One of the main components inside a line protection system is protective relays. Failure of the protective relays may reduce the integrity and reliability of the protection system and that will impact the overall performance of the power system. This could lead to power system interruptions of the electrical power supply, which may result in blackouts. Hence, it is imperative for power utilities to assess the reliability of protective relays. This presentation will discuss how reliability analysis is implemented to assess the reliability of protective relays vis-à-vis a line protection system.

Key Words: Line Protection System, Protective Relays, Life Data Analysis, Weibull Analysis, System Reliability Analysis, Reliability Block Diagram

Mohd Iqbal Ridwan

TNB Research Sdn Bhd