Maintenance practices for transmission overhead lines

• Published in: 9th IET International Conference on Advances in Power System Control, Operation and Management (APSCOM 2012) p. 152
• Main Authors: Lee, M.K, Pak, C.W
• Format: Conference Proceeding
• Language: English
• Published: Stevenage, UK IET 2012; The Institution of Engineering & Technology
• Subjects: Overhead power lines; Plant engineering, maintenance and safety; Power line supports, insulators and connectors; Power system control; Power system management, operation and economics; Power transmission, distribution and supply; Protection apparatus; Reliability; protective coatings; transmission overhead line reliability; Hong Kong; underground cable; maintenance engineering; lightning arrestor; vegetation; HVIC; power transmission economics; ground stability; flying object; TOHL; tower refurbishment; CLP power transmission network; power transmission reliability; arresters; poles and towers; power system stability; electricity transmission; high voltage insulation coating; insulation; cost effective maintenance strategy; long term economic growth; CLPP; environmental pollution; condition-based strategy; voltage 400 kV; power overhead lines
• ISBN: 1849197431; 9781849197434
• DOI: 10.1049/cp.2012.2158

Overhead lines (OHL) operating at 400kV, form the backbone of CLP Power's transmission network. Unlike underground cables, overhead lines are vulnerable to external environmental attacks, such as adverse weather, high humidity, pollution, ground stability, vegetation, and flying objects etc. To ensure high reliability and availability of the overhead lines for bulk electricity transmission, cost effective maintenance strategies including the application of specific accessories and materials, such as lightning arrestor and high voltage insulation coating (HVIC) as well as tower refurbishment to mitigate the risks caused by lightning, pollution and typhoon are essential. CLP Power (CLPP) has adopted both preventive and condition-based strategies for Transmission overhead line (TOHL) maintenance for many years and has accumulated a lot of valuable experience and knowledge on the implementation of various maintenance and refurbishment practices. These practices have led to the achievement of world class service performance and contributed in the long term economic growth of Hong Kong. (6 pages)