The SYS combination transformer places the transformer body, high-voltage load switch, and protective fuse in the same oil tank, greatly reducing the sizeof the equipment and the box bodyFor a fully sealed structure,the box cover is sealed with concealed high-strength bolts and oilresistant nit rile rubber gaskets, which can withstand a pressureof 50kPa for a long time. The design of the box fully considers therequirements of waterproofing and anti condensation. The top cover design has a 5% slope to prevent water accumulation. The box dooris a three-point interlocking system, and the high-voltagecompartment can only be opened after the low-voltage compartment is opened.