1 Ring Main Unit is composed of four
part: switching chamber 、fuse
chamber 、operating
mechanism chamber and cable chamber (bottom support).(see picture
1).
2 Load switch is adopted gas
evolving structure, processed high arc-extinguishing ability and it
is not influenced phase to phase and phase to earth insulation. All
of the moving and static contacts have the arc contact, it is
greatly raise breaking times.
3 Fuse and load switch constitute
transformer protective circuit. High voltage current limiting fuse
is equipped in epoxy pouring insulating enclosure. After fuse
burning out, the firing spin eject and load switch open.