Abstract
According to fault records, most transmission line outages arc caused by lightning. Recently transmission line arresters using Metal-Oxide elements have been developed up to 500kV in Japan and have been applied to service lines with good service experiences. The most of line faults due to lightning occurs in summer season, while in some areas facing to the Sea of Japan, the line faults have been often caused by the winter lightning which has usually a huge energy owing to longer duration as compared with the lightning in summer.
Until now, the performance of the arrester has not been proved for such a winter lightning. Therefore, field observation has been carried out for rocket-triggered or natural lightning in winter at the Okushishiku test line from 1993 to 1996. This paper reports the results of the measurement and EMTP analysis about performance of the arresters against winter lightning.
