... , hermetically sealed construction, security, maintenance free ZGS Series combination substation (American type)Model No.: ZGS x-x-x/x ZGS ... All protective elements such as transformer body, high-voltage load switch and fuse etc. are immersed in transformer insulating oil. ... etc. ZGS x-x-x/x Series combination substation transformer has terminal type and ring type. Feature:Compact structure, small size, ...