Metal clad electric distribution and switching plants for high voltages

Claim 2

A metal clad electric distribution and switching plant for high voltages including a plurality of multiphase switching panels and at least one multiphase busbar system for the electric circuit interconnection of said switching panels, each phase of at least one of said switching panels comprising a metal lowpressure-vessel filled with insulating gas under low pressure, a high-pressure-vessel filled with arc-extinguishing gas under high pressure and located within said low-pressure-vessel, a gas blast circuit-breaker at least constructed to interrupt said circuit, a series connection of a plurality of pairs of cooperating power contacts forming part of said circuit-breaker, a plurality of switching vessels, each pair of power contacts being accommodated in an individual one of said switching vessels and conduits of the shortest possible length extending between said high-pressure vessel and said switching vessels being insulatedly accommodated in said low-pressure-vessel outside said high-pressure-vessel.

Claim 3

A metal clad electric distribution and switching plant as claimed in claim 1, comprising an isolator constructed to keep the circuit interrupted and to close same and an additional switching vessel, said additional vessel containing said isolator and being also located in said low-pressure-vessel outside said high-pressure-vessel, said isolator being connected in series with said series connection of pairs of cooperating power contacts oF the circuit-breaker and said power contacts being constructed to interrupt the circuit only and constituting together with said isolator the said gas blast circuit-breaker.

Claim 4

A metal clad electric distribution and switching plant as claimed in claim 1, in which all switching vessels of the gas blast circuit-breaker are mounted in a circular series round the high-pressure-vessel.

Claim 5

A metal clad electric distribution and switching plant as claimed in claim 1, in which all switching vessels of the gas blast circuit-breaker are supported by said high-pressure-vessel.

Claim 6

A metal clad electric distribution and switching plant as claimed in claim 1, comprising in addition a plurality of cylinders, a plurality of pistons mounted for reciprocation in said cylinders and adapted to be driven by extinguishing gas from the high-pressure-vessel, each piston being coupled with a movable switching contact of the gas blast circuit-breaker, conduits extending between the high-pressure-vessel and spaces of said cylinders, valves being provided in said conduits and constructed to be operated from the outside and to control said pistons, a housing and means contained in said housing for the operation of said valves, the high-pressure-vessel extending in a gas-tight manner through an end wall of the low-pressure-vessel and said housing being mounted on the end wall of the high-pressure-vessel outside the low-pressure-vessel.

Claim 7

A metal clad electric distribution and switching plant as claimed in claim 5, comprising also a removable envelope, said envelope enclosing a space located above the two pressure vessels and closed in a gas-tight manner, said housing containing said valve operating means being accommodated within said envelope.

Claim 8

A metal clad electric distribution and switching plant as claimed in claim 5, comprising in addition a high-pressure-chamber contained in said housing and communicating with the high-pressure-vessel, said conduits provided with said valves for controlling said pistons coupled with the movable switching contacts of the gas blast circuit-breaker being connected to said housing and said valves being accommodated in said housing and constructed as change-over valves, which in their one positions connect said conduits with said high-pressure-chamber and in their other positions connect said conduits with the atmosphere or with the low-pressure-vessel.

Claim 9

A metal clad electric distribution and switching plant as claimed in claim 5, comprising in addition a high-pressure-chamber contained in said housing and communicating with the high-pressure-vessel, the conduits provided with the valves for controlling the pistons coupled with the movable switching contacts of the gas blast circuit-breaker being directly connected to the high-pressure-vessel, said valves being provided on the switching vessels of the gas blast circuit-breaker and constructed for pneumatical operation, conduits for the pneumatical operation of said valves, said latter conduits being connected to said housing, and change-over valves accommodated in said housing, said change-over valves being arranged for connecting said last mentioned conduits either to said high-pressure-chamber or to the atmosphere or the low-pressure-vessel.

Claim 10

A metal clad electric distribution and switching plant as claimed in claim 5, comprising in addition operating means accommodated in said housing, the conduits provided with the valves for controlling the pistons coupled with the movable switching contacts of the gas blast circuit-breaker being directly connected to the high-pressure-vessel and said valves being provided on the switching vessels of the gas blast circuit-breaker and mechanically coupled for their operation with said operating means accommodated in said housing.

Claim 11

A metal clad electric distribution and switching plant according to claim 5, comprising in addition a high-pressure-chamber contained in said housing and communicating with the high-pressure-vessel, differential cylinders provided in said housing, differential pistons mounted for reciprocation in said differential cylinders, means for the operation of the valves for controlling the pistons coupled with the movable switching contacts of the gas blast circuit-breaker being provided in said housing and coupled with said differential pistons, the smaller piston area of each one of said differential pistons being permanently exposed to the pressure in said high-pressure-chamber and the larger piston area thereof being exposed to the pressure in the cylinder space of greater diameter of the differential cylinder in question, conduits having a delaying action, change-over valves contained in said conduits, said change-over valves being coupled with said differential pistons and adapted each to connect a cylinder space of greater diameter of such a differential cylinder through such a conduit either with said high-pressure-chamber or with the atmosphere or the low-pressure-vessel, and locking means adapted to be unlocked from the outside, said locking means holding, in each condition of rest of the circuit-breaker, said operating means in their positions, in which said spaces of greater diameter of said differential cylinders communicate through said conduits and said change-over valves with the atmosphere or the low-pressure-vessel.

Claim 12

A metal clad electric distribution and switching plant as claimed in claim 10, in which said change-over valves coupled with said differential pistons are at the same time the valves for controlling the pistons coupled with the movable switching contacts of the gas blast circuit-breaker.

Claim 13

A metal clad electric distribution and switching plant as claimed in claim 10, in which said change-over valves coupled with said differential pistons are at the same time change-over valves for the pneumatical operation of the valves for controlling the pistons coupled with the movable switching contacts of the gas blast circuit-breaker.

Claim 14

A metal clad electric distribution and switching plant as claimed in claim 10, in which electrically controllable magnets are provided to hold said locking means in their locking positions.

Claim 15

A metal clad electric distribution and switching plant as claimed in claim 10, comprising in addition at least one busbar isolator, an additional cylinder, a piston mounted for reciprocation in said additional cylinder and coupled with the movable contact of said busbar isolator, said busbar isolator being constructed to connect the gas blast circuit-breaker with other parts of the circuit and being in communication with the low-pressure-vessel outside the high-pressure-vessel, at least one additional valve housing mounted on the housing containing the operating means for controlling the gas blast circuit-breaker, additional change-over valves accommodated in said additional valve housing and conduits extending between the spaces of said additional cylinder and said additional valve housing, said additional change-over valves being adapted to connect said additional cylinder spaces either with the high-pressure-chamber of said housing containing said operating means or with the atmosphere or the low-pressure-vessel.

Claim 16

A metal clad electric distribution and switching plant according to claim 5, in which a valve constructed to be operated from the outside is provided between the high-pressure-vessel and the high-pressure-chamber of the housing containing the operating means for controlling the gas blast circuit-breaker.