Abstract
Overhead ground wires installed on transmission lines have been proved to be effective to protect conductors from direct lightning strokes, but ground wire breakouts due to icing are frequently reported. In order to prevent electric failure accidents caused by ground wire breakouts under icing conditions, unshielded transmission lines equipped with metal oxide arresters (MOAs) whole line have been proposed in high mountainous areas. Compared with ordinary transmission lines, lightning stroke risk of unshielded lines is much higher. In order to improve the lightning performance of unshielded lines, it is necessary to obtain the essential lightning energy absorption ability of the MOAs installed on unshielded lines. In this article, simulation model of unshielded 220 kV transmission lines equipped with MOAs is built, the influences of lightning parameters, striking occurrence point and grounding resistance on the absorbed energy of MOAs are analyzed. Based on Monte Carlo method, lightning trip-out rate of unshielded transmission lines are calculated, and suggested energy absorption ability of MOAs is proposed, which can give references for the improvement of power supply reliability of transmission lines.
Highlights
Overhead ground wires are used to reduce the tripping rate of transmission lines caused by lightning[1,2]
Till lightning performance assessment of unshielded transmission lines equipped with metal oxide arresters (MOAs) have not been studied, and the subsequent strokes of lightning were not usually considered in energy absorption calculation of MOAs
In view of the exiting studies, this paper focuses on the calculation of the relationship between the energy absorption capability of MOAs and the lightning failure rate of unshielded transmission lines
Summary
Overhead ground wires are used to reduce the tripping rate of transmission lines caused by lightning[1,,2]. Breakouts of renewable energy transmmsion line ground wires have been frequently reported in recent years due to icing, bird damage, corrosion, wind and so on To solve this problem, transmission lines without overhead ground wires were proposed [3,4], in order to maintain and enhance the lightning protection ability at the same time, metal-oxide arresters(MOAs) are installed on each phase of each tower. In view of the exiting studies, this paper focuses on the calculation of the relationship between the energy absorption capability of MOAs and the lightning failure rate of unshielded transmission lines. The influence of grounding resistance, striking point on the absorbed energy of MOAs was analyzed, and the desired MOA energy absorption ability for expected lightning failure rate of the studied 220kV unshielded lines was obtained. The research of this paper provides a promising way for lightning protection in high mountainous areas
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