... the prefabricated substation also installs the four-position load switchers, second-stage load switches, back-up protection fuse and plug- ... install the control electrical appliances, power distribution electrical equipment, compensation devices and energy metering devices according to user's ... ,160,200,250,315,400,500,630,800,10003No-load tap changer ±2*2.5%4Vector group Yn115Rated insulation ...