US 6,660,954 B2 · Gas-blast circuit-breaker

Abstract

The gas-blasted circuit-breaker includes a movable arc contact, a fixed arc contact opposing the movable arc contact, an insulating nozzle, a puffer cylinder, a hollow conductor, an insulating rod connected to the puffer cylinder, and a fixed piston fitted inside the puffer cylinder. An insulating gas is ejected to a space between the puffer cylinder and the fixed piston by driving the insulating rod and is sprayed to an arc generated upon interruption of a current. The hollow conductor is in a cylindrical shape having a cross section parallel to the axis thereof. The cross section is smaller in diameter on the downstream side of a flow of insulating gas. The hollow conductor has a closed end on the downstream side of the flow of insulating gas and has a cylindrical barrel portion provided with a plurality of opening. With this configuration, this circuit-breaker ensures an operation of adjusting the flow of a heat gas, cooling of the heat gas and insulating performance for the fixed conductor to which the heat gas is sprayed.

Claims7

Dependent claims

A gas-blasted circuit-breaker comprising:

a movable arc contact;
a fixed arc contact opposed to the movable arc contact;
an insulating nozzle disposed at the movable arc contact on the fixed arc contact side thereof;
a puffer cylinder disposed on the side opposite to the insulating nozzle;
a hollow conductor that holds the fixed arc contact opposed to the insulating nozzle;
an insulating rod connected to the puffer cylinder;
and
a fixed piston fitted inside the puffer cylinder;
wherein an insulating gas is ejected to a space between the puffer cylinder and the fixed piston by driving the insulating rod and is sprayed to an arc generated upon interruption of a current;
and
wherein the hollow conductor is in a cylindrical shape having a cross section parallel to the axis thereof, the cross section being smaller in diameter on the downstream side of a flow of insulating gas, the hollow conductor having a closed end on the downstream side of the flow of insulating gas, and the hollow conductor has a cylindrical barrel portion provided with a plurality of openings.

8 more elements

A gas-blasted circuit-breaker comprising:

a movable arc contact;
a fixed arc contact opposed to the movable arc contact;
an insulating nozzle disposed at the movable arc contact on the fixed arc contact side thereof;
a puffer cylinder disposed on the side opposite to the insulating nozzle;
a conductor secured to the fixed arc contact opposed to the insulating nozzle;
an insulating rod connected to the puffer cylinder;
and
a fixed piston fitted inside the puffer cylinder;
wherein an insulating gas is ejected to a space between the puffer cylinder and the fixed piston by driving the insulating rod and is sprayed to an arc generated upon interruption of a current;
and
wherein the conductor includes a semicylindrical member having an opening on the downstream side of a flow of insulating gas and a cross-section being parallel to the axis of the conductor and being smaller on the downstream side of the flow of insulating gas, and a semicylindrical shield member that is joined to both side portions of the opening side of the semicylindrical member on the side portions of a cylindrical portion of the semicylindrical shield member in the longitudinal direction thereof on the upstream side of the flow of insulating gas, and the semicylindrical shield member has a shape in which the distal end thereof on the downstream side of the flow of insulating gas is closed.

8 more elements

Dependencies are inferred from the claim text.

Gas-blast circuit-breaker

Life of this patent

Gas-blast circuit-breaker

Life of this patent

Abstract

Claims7