| 摘要 |
PROBLEM TO BE SOLVED: To obtain a switchgear at an electric power station, that prevents short circuit caused by lightning between electrodes of a breaker, even when multiple lightning strokes occurs on aerial transmission lines and lightning surges from a plurality of transmission lines enter breakers of the line unit of the switchgear connected to the transmission lines of the aerial transmission lines. SOLUTION: A main bus line is connected in series to a main bus line side isolator, a breaker and a line side isolator, and parallel lightning arresters in which zinc oxide elements are stacked in series are connected parallel to the breakers of the line unit of the switchgear at an electric power station, in which line lightning arresters are arranged between the end of the line side isolator and ground. The ends of the line side are connected to the transmission lines of the aerial transmission lines, and the main bus line side isolators are connected to the main bus line. |
