短語詞組短語main -transformer differential 主變差動substation main power transformer 變電所主變壓器The main transformer transformer 變壓器的主變Main distribution transformer 主分配變壓器main power transformer 主變壓器single main -transformer operation 單臺主變運行insulating oil in main -transformer 主變本體油500 kV main transformer kV 主變壓器 返回 main transformer