Tower mounted high voltage switchgear

A high voltage gas-insulated switchgear comprising:

• a supporting structure configured to be connected to a lattice structure of a high voltage transmission tower;
• and
• a first and a second gas-insulated combined interruption and disconnection modules, each of said first and second gas-insulated combined interruption and disconnection modules comprising, for each phase:
• a combined interruption and disconnection unit, each of said combined interruption and disconnection unit comprising a gas-tight casing developing along a reference axis and housing at least a terminal for at least an input/output connection;
• a first combined disconnecting and earthing switch having a first fixed contact operatively coupled to said first terminal of said at least said terminal, a second fixed contact at ground potential and a first movable contact operatively couplable to said first and second fixed contacts for disconnecting and earthing operations;
• a second combined disconnecting and earthing switch, said second combined disconnecting and earthing switch having a third fixed contact operatively coupled to a second terminal of said at least said terminal, a fourth fixed contact at said ground potential and a second movable contact operatively couplable to said third and fourth fixed contacts for disconnecting and earthing operations,
• a fast earthing switch interposed between said first fixed contact and said first terminal;
• and
• a circuit breaker unit electrically connected to said first movable contact of said first combined disconnecting and earthing switch and to said second movable of said second combined disconnecting and earthing switch,
• said first terminal of said first combined interruption and disconnection unit being electrically connected to a first electrical line, said first terminal of said second interruption and disconnection unit being electrically connected to a second electrical line, said second terminals of said first and second combined interruption and disconnection units being electrically coupled to each other, said high voltage gas-insulated switchgear configured to be mounted on said supporting structure within said lattice structure of said high voltage transmission tower, said reference axes of said gas-tight casings of said first and second gas-insulated combined interruption and disconnection modules being aligned in a same direction, and said first and second combined interruption and disconnection modules configured to be positioned at a height within said lattice structure of said high voltage transmission tower.

A method of mounting a high voltage gas-insulated switchgear to a high voltage transmission tower, the method comprising:

• connecting a supporting structure of said high voltage gas-insulated switchgear to a lattice structure of said high voltage transmission tower, said high voltage gas-insulated switchgear comprising:
• a first and a second gas-insulated combined interruption and disconnection modules, each of said first and second gas-insulated combined interruption and disconnection modules comprising, for each phase:
• a combined interruption and disconnection unit, each of said combined interruption and disconnection unit comprising a gas-tight casing developing along a reference axis and housing at least a terminal for at least an input/output connection;
• a first combined disconnecting and earthing switch having a first fixed contact operatively coupled to said first terminal of said at least said terminal, a second fixed contact at ground potential and a first movable contact operatively couplable to said first and second fixed contacts for disconnecting and earthing operations;
• a second combined disconnecting and earthing switch, said second combined disconnecting and earthing switch having a third fixed contact operatively coupled to a second terminal of said at least said terminal, a fourth fixed contact at said ground potential and a second movable contact operatively couplable to said third and fourth fixed contacts for disconnecting and earthing operations,
• a fast earthing switch interposed between said first fixed contact and said first terminal;
• and
• a circuit breaker unit electrically connected to said first movable contact of said first combined disconnecting and earthing switch and to said second movable of said second combined disconnecting and earthing switch,
• electrically connecting said first terminal of said first combined interruption and disconnection unit to a first electrical line;
• electrically connecting said first terminal of said second interruption and disconnection unit to a second electrical line,
• electrically connecting said second terminals of said first and second combined interruption and disconnection units to each other, and
• said reference axes of said gas-tight casings of said first and said second gas-insulated combined interruption and disconnection modules being aligned in a same direction.