SU1270812A1 - Arc-quenching device for gas circuit breaker - Google Patents

Description

arc off. This greatly simplifies the design of the arcing device, since the brake assembly contains only two elements — the center 16 and the piston 17, for the control of which no special valve is required. The simplicity of the brake assembly, which consists of the presence of only one moving element, leads to an increase in the reliability of the switch as a whole. 1 hp f-ly, 3 ill.

The invention relates to a high-voltage instrumentation9, namely, arcing devices of high-voltage gas switches.

The purpose of the invention is to simplify and improve the reliability of the arcing device of a gas switch,

FIG. 1 shows the double-extinguishing gas arc extinguishing device with double-sided blowing, with and in the on position; FIG. 2 is the same at the time of extinguishing the electric arc; in FIG. 3, the same in the disconnected position.

The arcing device includes a metal tank filled with compressed air, performing the function of an arc-suppressing and insulating medium. The current-carrying circuit is introduced into the tank With the help of inputs 2, internal, with respect to the tank, the ends of which have fixed finger contacts 3, Movable tubular The contacts 4 are mounted with the possibility of axial movement in the housing 5. The output of compressed air from the housing 5 to the atmosphere is controlled by a blowing valve 6. In the inner ends of the inlets 2 there is a blowing outward valves 7, which are connected by control insulating tubes 8 to the housing 5, Movable contacts 4 are mechanically connected by means of earrings 9, pivoting levers 10 fixed on the housing 5, and rods 11 to the crosspiece 12 fixed to the end of the rod 13, Other the end of the rod 13 is provided with a piston 14. which abut in the engaged position of the contacts in the valve plate 6. In the housing 5 a spring lock 15 is fixed for fixing the contacts 4 in the disconnected position. Cylinder

16 The piston 17 of the brake assembly is also mounted on the housing 5. The internal cavity of the cylinder 16 is in communication with the cavity of the housing 5 via a tube 18.

When the switch is opened, the compressed air is supplied to the actuator 19 through the tube 20, which opens the blow valve 6 and contacts 11 and 4, transfer contacts 4 to the optimum distance from the contacts 3 (Fig. 2). 4 from the blower valve 6 is transmitted through the piston 14, the rod 13, the yoke 12, the rods 11, the levers 10 and the earrings 9,

When opening the blow valve 6, the pressure of compressed air in the housing 5 and, consequently, in the cavity of the brake cylinder to the right of the piston 17 and in the cavity under the valve 7 decreases sharply, which causes the opening of the blow valves 7 and the movement of the piston 17 to the right due to forces from the pressure difference of the compressed of air.

The rod 13 rests on the piston 17, causing deceleration and delay of the contacts 4 at an optimum distance from the fixed contacts 3 for the arc-suppression.

The electric arc of the shutdown 21 (figure 2) appearing on the contacts 3 and 4 is extinguished by flows of compressed air, one of which passes through the tubular moving contacts 4, the internal cavity of the housing 5 and the blowing valve 6 into the atmosphere, and the other through the channels in the fixed contacts 3 , open blowing valves 7 and through channels in inlets 2 to the atmosphere, as shown by the arrows in FIG. 2, After the arc of shutdown 21 is extinguished, the blowing valve 6 is closed and the pressure-compressed air in the compressor 5 rises to the pressure in the tank 1. At causing-1 closing the blower valves 7, the pressure of compressed air on both sides of the piston 17 is equalized and it stops holding the movable contacts 4 from moving under the action of the spring clamp 15 in the direction away from the fixed contacts 3. The movable contacts 4 are diverted from the fixed contacts 3 to the distance providing the required level of insulation (Fig. 3).

When passing the command to turn the switch on, the brake assembly does not participate in the arcing device, the piston 17 remains stationary in the leftmost position, since the pressures of compressed air on both sides of the piston 17 are the same. The compressed air is evacuated from the actuator 19 and through the hollow rod of the blast valve 6 from the cavity 22 (FIG. 3X) to the right of the piston 14. The resulting pressure difference acting on the piston 14 creates a force that moves the moving contacts to the on position.

Thus, this device greatly simplifies the design of the arcing device, since the brake assembly contains only two elements - a cylinder and a piston, for which control a special valve is not required. In addition, the simplicity of the brake assembly, which consists of the presence of only one moving element, is responsible for increasing the reliability of the punch box as a whole.

The operation of the brake assembly only with a shutdown operation facilitates the operation of the drive of the contacts upon switching on, which in turn is also positive.

on increasing reliability

.switches

Claims (2)

1. Arrester of gas switch, containing a contact system located in a tank with compressed gas in the form of interacting moving and fixed contacts, at least one of which is hollow and has a nozzle at its tip, which is the beginning of a path for the release of a stream of compressed gas , the products of the arc shutdown in the zone of reduced pressure, the blow valve installed at the end of the path, the drive of the moving contacts and the brake assembly consisting of 151 cylinders and a piston, connected movable contacts and designed for their delay at the time of extinguishing the arc of shutdown at the optimum distance to the arc from the movable contacts, characterized in that, in order to simplify the device and increase its reliability, the cavity of the brake assembly cylinder located on one side of its piston communicating directly with the internal cavity of the tank, and the cavity located on the other side of the piston, is communicating with the help of a tube with a path to emit the products of the arc of a shutdown . 2. The device according to claim 1, about tl l and so that it; equipped with a system of levers arranged in such a way that the piston of the brake assembly is mechanically connected with the moving contacts during a shutdown operation and disconnected during a switching operation.