Gec Alsthom T&d Ag

Sprecher Energie Ag

Areva T&d Ag

Alstom Technology Limited

General Electric Technology Gmbh

Johannes Blatter

Robert Lüscher

Lukas Treier

Hugo Hiltbrunner

Gerardo Palmieri

Fabrizio Sciullo

Assen Vassilev

An electrical insulator disk has central recesses and peripheral recesses to enable the disk to be mounted floatingly relative to flanges between which the disk is held and to a linear conductor that extends through the disk.

Insulator disk for supporting a linear conductor, and an electrical assembly including such a disk

In a pressurized gas circuit-breaker the mobile contact member is fixed to a connecting rod that passes coaxially through the fixed braking cylinder. The braking cylinder has transverse walls at both ends so as to delimit a cylinder. The connecting rod has a drive abutment that drives the braking piston in a final section of the opening travel, which increases the pressure in the first sub-space and reduces the pressure in the second sub-space. The braking piston is disposed on a bush around the connecting rod, the bush and the connecting rod delimiting an annular cylinder space between the drive member and a counter-abutment on the bush, a pressure being generated when the circuit-breaker opens. In this way a high braking force with no impact is very rapidly obtained.

Pressurized gas circuit-breaker

A compressed gas-blast circuit breaker including a pump cylinder which is moved along with a movable first contact piece. The pump cylinder surrounds a pumping space and a blast chamber, the latter of which is fluidly connected to a first blast nozzle surrounding the first contact piece. A pump piston is supported on a fixed support part via toggle levers, and a toggle joint of the toggle levers is pivoted to a drive rod via a rocker. At the start of a switch-off stroke, an initial bent position of the toggle lever is lessened, intensified after the straightened position has been passed, then lessened again and intensified again after the straightened position has been passed once more. The oscillation of the toggle lever about the straightened position permits the pump piston to be virtually stationary, while an intermediate bottom, which separates the pumping space from the blast chamber, approaches the pump piston in order to reduce the pumping volume. As a result, arc extinguishing gas is pumped into the blast chamber through a nonreturn valve from the pumping space in order to generate blast pressure. Subsequently, the pump piston is moved in the same sense as the pump cylinder until the switched-off position is reached. The pump piston is positively guided during switching off and also during switching on.

Compressed gas-blast circuit breaker

In a gas-blast circuit breaker, compressed gas is directed through a movable contact maker into a blow-out space, the latter being delimited by a cylinder and a piston which is operatively associated with the movable contact maker. The piston comprises inlet openings which are releasably closed by means of a valve body. At a neck or collar of the piston there is displaceably mounted an actuating element, the latter being reciprocatingly movable between a lower first lock-in position and an upper second lock-in position. The actuating element comprises a nose or lug which, during the closing operation, abuts against an upper stop face or surface, whereby the actuating element is brought into the lower first lock-in position. The valve body thereby moves into the closed position thereof. Towards the end of the opening stroke, a shaft associated with the actuating element comes to bear upon a lower stop face or surface, so that the actuating element is brought back to the upper second lock-in position thereof, whereby the valve body is returned to and retained in its open position. The blow-out space is thus connected with the ambient space during the closing operation and again separated from the ambient space prior to the opening or tripping operation. The driving mechanism of the circuit breaker is assisted during the interruption of relatively high-amperage currents and no additional driving effort is required of the driving mechanism during the closing operation and the interruption of relatively low-amperage currents. The gas-blast circuit breaker thus gets by with a driving mechanism of relatively low operating power.

Gas-blast circuit breaker

Growing community of inventors

Gretzenbach, Switzerland

Johannes Blatter