Gas-insulated switchgear including a vacuum switch, operating mechanism and plural bellows

A gas-insulated switchgear comprising:

• a gas tank filled with an insulating gas having a gas pressure at least equal to atmospheric pressure, said gas tank including a first bellows;
• a vacuum switch housed in said gas tank and including a vacuum tank having a second bellows, said vacuum switch having a movable terminal and a contact means enclosed in said vacuum tank, said contact means including a fixed contact element and a movable contact element, one end of said movable terminal being fixed to said movable contact element and extending from said vacuum tank through said second bellows, said movable and contact element of said contact means being movable to perform electrical connection and disconnection functions by driving means located outside of said gas tank;
• and
• a transmission mechanism including a driving rod for transmitting an operation force from said driving means to said movable terminal of said vacuum switch, said driving rod extending from said gas tank through said first bellows.