US 4,105,879 A · Magnetic puffer type gas circuit breaker

Abstract

In a magnetic puffer type gas circuit breaker including an electromagnetic coil through which a current to be interrupted flows during the breaking operation, and an electromagnetic repulsive member which produces an electromagnetic repulsive force in cooperation with the electromagnetic coil and drives movable parts of a breaking portion of the apparatus, the electromagnetic repulsive member is so arranged that the electromagnetic neutral position of the electromagnetic repulsive member within the electromagnetic coil at the time when the breaking portion has been closed deviates on the closing side with respect to the electromagnetic center of the electromagnetic coil. Further, the characteristics of the electromagnetic repulsive forces between the electromagnetic coil and the electromagnetic repulsive member are so set that their absolute values become smaller on the closing side than on the breaking side with respect to the point at which the electromagnetic center of the electromagnetic coil and the electromagnetic neutral position of the electromagnetic repulsive member are coincident.

Claims15

Dependent claims

In a circuit breaker having at least one pair of contacts mounted for movement into and out of contact with each other and operating means connected to one of said contacts for effecting movement thereof with respect to the other contact to open and close the circuit breaker, electromagnetic driving means for assisting in the opening operation of the circuit breaker comprising a driver connected to said operating means, an electromagnetic coil connected to receive the current to be interrupted, an electromagnetic repulsive member connected to said drive for movement in a closing direction and a breaking direction and being electromagnetically coupled to said coil to produce an electromagnetic repulsive force on said operating means, and commutation means for applying the current to be interrupted to said coil during opening of the circuit breaker to thereby generate said repulsive force which aids said operating means in opening the circuit breaker, said repulsive member being arranged in said coil so that at a closed position of said contacts the electromagnetic neutral point of said repulsive member deviates slightly on the closing side with respect to the electromagnetic center of said coil.

A magnetic puffer type gas circuit breaker comprising at least one pair of contacts mounted for movement into and out of contact with each other;

a puffer unit including a puffer cylinder and a puffer piston responsive to opening of said contacts for compressing an arc-extinguishing gas and blowing it against arcs produced between said opening contacts;
operating means for effecting opening and closing of said contacts;
an electromagnetic driving unit for aiding the opening operation of said operating means and the operation of said puffer unit including an electromagnetic coil connected to receive the current to-be-interrupted, and an electromagnetic repulsive member electromagnetically coupled with said electromagnetic coil and connected to said operating means for movement in a closing direction and a breaking direction to produce an electromagnetic repulsive force aiding the opening operation of said operating means;
and commutation unit which commutates the current to-be-interrupted to said electromagnetic coil upon opening of said contacts;
said electromagnetic repulsive member being so constructed that a closed portion of said contacts, the electromagnetic neutral position of said member deviates slightly on the closing side with respect to the electromagnetic center of said electromagnetic coil, and that absolute values of the electromagnetic forces of said electromagnetic coil and said electromagnetic repulsive member at points equally distant from a point at which the electromagnetic center of said electromagnetic coil and the electromagnetic neutral position of said electromagnetic repulsive member are coincident become smaller on the closing side than on a breaking side.

2 more elements

A magnetic puffer type gas circuit breaker comprising at least one pair of contacts mounted for movement into and out of contact with each other;

a puffer unit including a puffer cylinder and a puffer piston responsive to opening of said contacts for compressing an arc-extinguishing gas and blowing it against arcs produced between said opening contacts;
operating means for effecting opening and closing of said contacts;
an electromagnetic driving unit for aiding the opening operation of said operating means and the operation of said puffer unit including an electromagnetic coil connected to receive the current to-be-interrupted, and an electromagnetic repulsive member electromagnetically coupled with said electromagnetic coil and connected to said operating means for movement in a closing direction and a breaking direction to produce an electromagnetic repulsive force aiding the opening operation of said operating means;
and a commutation unit which commutates the current to-be-interrupted to said electromagnetic coil upon opening of said contacts;
said electromagnetic repulsive member being so constructed that at a closed position of said contacts, the electromagnetic neutral position of said member deviates slightly on the closing side with respect to the electromagnetic center of said electromagnetic coil.

2 more elements

Dependencies are inferred from the claim text.

Magnetic puffer type gas circuit breaker

Life of this patent

Magnetic puffer type gas circuit breaker

Life of this patent

Abstract

Claims15