Condition Evaluation of High Voltage Transmission Line in Thailand

  • Waraporn Luejai
  • Thanapong SuwanasriEmail author
  • Cattareeya Suwanasri
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 598)


This paper presents a novel approach for practical condition evaluation of HV overhead transmission lines in Thailand. The transmission components includes conductor, conductor accessories, insulator, steel structure, foundation, lightning protection system, tower accessories and right of way. Significant and scientific laboratory tests as well as criteria to evaluate the condition are proposed such as special tests e.g. tensile strength, torsional ductility, and loss of zinc test of conductor, thermography, visual inspection all components, and etc. The weighting and scoring method is applied to calculate the health index of transmission line. According to standards and experts’ experiences, the condition evaluation criteria are scored and ranged into six levels from very good condition till end of life while importance weights of components and testing methods are determined by applying Analytical Hierarchy Process. Then, the condition in form of health index and maintenance task are classified into three levels as normal condition with scheduled maintenance, moderate condition with increasing of scheduled maintenance as well as medium term planning for renovation or replacement and poor condition that needs urgent replacement of defective equipment or replacement planning by new transmission line. The on-line web-application was developed for a simple, effective and real-time usage to all users. Twenty of 115, 230 and 500 kV transmission lines with the practical testing data were evaluated. The results show an effectiveness of the health index determining procedure to prioritize and manage maintenance tasks accordant to the exact condition of transmission lines to reduce maintenance cost and maintain better system reliability.


Condition evaluation Health index calculation Weighting and scoring method Asset management Transmission network maintenance 



Authors would like to acknowledge the Department of Transmission System Maintenance, Department of Research and Development, the Electricity Generating Authority of Thailand for funding and all cooperation.


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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Waraporn Luejai
    • 1
  • Thanapong Suwanasri
    • 1
    Email author
  • Cattareeya Suwanasri
    • 1
  1. 1.King Mongkut’s University of Technology North BangkokBangkokThailand

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