Finding the Cause of Metal Oxide Surge Arresters' Failures in Mountainous Areas of Khuzestan Province; Engineering Experiences of Analyzing Field Results in a Very Large 33 kV Network
Subject Areas : electrical and computer engineeringElaheh Mashhour 1 * , Seyed Hamidreza Alemohammad 2
1 - Shahid Chamran University of Ahvaz
2 -
Keywords: Surge arrester, continuous overvoltage, lightning overvoltage, energy absorption capability, earthing system,
Abstract :
This paper presents the findings of a practical study to detect the degradation factors of metal-oxide surge arresters in a distribution network in the mountainous region of Izeh, which experiences two warm and temperate climates annually. The surge arresters have defected in both periods when the network operating conditions and weather conditions are completely different. However, the appearance of the defected surge arresters in these periods is different. In this paper, by simulating the network, its permanent and transient state behaviors are analyzed. Based on the results and environmental conditions, the appropriate arresters' specifications for the network are obtained and compared with existing arresters. By considering different scenarios for ground resistance of arresters, the changes in energy absorbed by arresters are evaluated and the results are compared with those obtained in the practical reduction of ground resistance of some of arresters. By adding several arresters to the network, changes in the absorbed energy of arresters are investigated. Based on the research findings, the causes of arresters' failures in both warm and temperate periods are investigated. Finally, the findings of this research are validated by comparing the simulation results with field events, and some solutions are presented to overcome the problems.
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