DE1216961B - Gas pressure switch - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

Number:
File number:
Registration date:
Display day:

HOIh

German KL: 21c-35/10

A43741VIIId / 21c
August 1, 1963
May 18, 1966

A compressed gas switch with multiple interruptions is known from the main patent application the pulse-operated power switching points are arranged in switching chambers that are constantly under pressure gas are and in which two equiaxed, at a fixed distance from each other are per switching point Nozzle tubes are provided that are used to extinguish the arc in the opposite direction from the compressed gas are flowed through and a movable bridging switch connecting the two nozzle pipes is provided, on the one hand with a pressurized gas-pressurized drive piston and on the other hand is indirectly in connection with a valve seat, and one of the nozzle pipes with a valve disk is provided, which together form the blow valve for the compressed gas. This is used to control the Bridging switch piece uses a control valve, through which the switch chamber facing away Side of the drive piston of the bypass contact vented for switching off and for the Closing is again acted upon with pressurized gas, the side of the switching chamber facing the The drive piston is constantly exposed to the switching chamber pressure. So it's a pretty strong one Closing spring required if, in view of the lowest possible compressed gas consumption, wants to achieve a rapid closing movement. Because the closing spring is tensioned when switching off must, which in turn makes the effective area of the drive piston undesirably larger must, it would be advantageous to do without such a strong closing spring.

According to the invention, this is achieved by switching on the bridging contact one side of its drive piston with the approximately constant supply pressure or control pressure and 'the other side is acted upon by the switching chamber pressure that occurs after switching off temporarily through a throttle point built into the refill line to the switching chamber is artificially degraded.

The drawing shows an embodiment according to the invention, based on the latter is explained in more detail.

F i g. 1 shows a switching chamber of a gas pressure switch in cut, while in

F i g. 2 shows a diagram from which the pressure curve and the contact piece movement can be seen are.

In Fig. 1, 1 denotes a hollow post insulator, on which the switching chamber 2 is built. The latter is designed as a double switching chamber, Gas pressure switch

Addition to registration: A 40774 VIII d / 21 c Auslegeschrift 1207 990

Applicant:

Public company Brown, Boveri & Cie.,

Baden (Switzerland)

Representative:

Dr.-Ing. E. Sommerfeld, patent attorney,
Munich 23, Dunantstr. 6th

Named as inventor:

Dieter Floessel, Fislisbach;

Gerhard Mauthe, Neuenhof (Switzerland)

the right half of which is only partially shown, but is otherwise completely symmetrical. In each switching chamber half there is a switching point, which is formed from the nozzle tube 3, which is electrically connected to the switching chamber, the nozzle tube 5, which is fastened in an insulated manner by means of the hollow insulator 4, and the bridging contact piece 6. The latter has, in the manner of a tulip contact, a plurality of contact fingers 6 a arranged on the circumference and the drive piston 6 b, which is guided so as to slide tightly in the cylindrical projection 2 a. At its left end, the bridging contact element 6 is designed as a valve seat and, together with the sealing disk 5 α attached to the nozzle tube 5, forms the blow valve. The interior of the post insulator 1 is connected with a large passage cross-section with the space 7, from which on the one hand a relatively small opening 8 leads into the actual extinguishing chamber space 9. On the other hand, an opening 10 which is comparatively larger than opening 8 connects space 7 with space 11. The valve disk of the control valve is designated by 12, and the valve rod 13 is used to actuate it. The lower end of the valve rod 13 is connected to a known type of drive device, not shown in detail. Room 11 has an opening that leads to the outside

609 569/327

tion 14, which is closed in the position shown by the valve disk 12, The interior of the nozzle pipes 5 and 3 is also connected to the outside. The drive piston 6 b closes off the annular space 15 formed by the parts 2 a and 3, which in turn communicates with the space 11.

The mode of operation of the arrangement is as follows: In the position shown, the switching point is closed, the spaces 7, 9, 11 being filled with pressurized gas which is supplied to them from a pressurized gas storage container (not shown) via the interior of the hollow insulator 1. To switch off the valve rod 13 and thus the valve disk 12 is quickly pulled down. As a result, the spaces 15, 11 are connected to the outside air via the opening 14 that is now free and thus depressurized, since at the same time the opening 10 is closed by the valve disk. Under the effect of the pressure prevailing in the space 9 the gas pressure, the bridging contact member 6 is pushed to the right b to the driving piston 6, wherein blown in known manner, the first between the contact members 5 and 6 are formed, and then the piece between the switch ¹ 5 and 3 burning breaking arc and deleted will. This creates a pressure drop in space 9. Then, in a known manner, a voltage isolating point (not shown), electrically in series with the switching point 3, 5, 6, is opened, which takes over the isolation of the switch in the off position, so that the switching point 3, 5, 6 are closed again after it is opened can. This is done in that the valve disk 12 is quickly brought up again by means of the valve rod 13 into the position shown. As a result, the spaces 11, 15 are again quickly filled with pressurized gas via the opening 10, while the filling of the space 9 via the relatively smaller opening 8 is only delayed, so that on the drive piston 6 b due to the excess pressure in space 15 temporarily a left directed force comes into effect, which brings the bridging contact 6 quickly back into the position shown. In Fig. 2, in the lower part, the temporal course of movement of the bridging contact piece 6 and above that the temporal pressure courses in the spaces 7, 9 and 15 are shown schematically. Here, the curve p _{t shows} the pressure in space 7, p ₂ the pressure in space 9 and p _s the pressure in space 15. At time t ₀ , valve disk 12 (FIG. 1) lifts off opening 14, whereby the pressure p ₃ in space 15 drops rapidly. The bridging contact 6 begins to move out of its end position / (Fig. 2, bottom) at the point in time ip when the pressure p _{3 has} dropped approximately to point A , the pressure p ₂ beginning to decrease because the pressurized gas is now out of the room 9 flows through the nozzle pipes 3, 5 into the open, and reaches its other end position O ( open position) approximately at time t _2. The aforementioned reversal of valve disk 12 begins at time i ₃ , as a result of which pressure p _& in space 15 rises again rapidly. At point B of the p ₃ curve, a pressure excess of p ₃ compared to p _{2 is} reached at time t _t , at which point the bridging contact element 6 begins its closing movement, which is ended at time t ₅ . In the meantime, the excess pressure of p _z compared to p _{2 has reached} its maximum value Δ ρ . The control pressure P ₁ in the space 7 drops only slightly during the switching process, since the spaces 11, 15 and the opening 8 acting as a throttle point can be kept relatively small. For the first filling of the compressed gas switch with compressed gas, a weak spring 16 is arranged in space 15, which only has the task of pushing the bridging contact 6 slightly against the sealing washer 5 a, and thus to keep the blow valve closed. A relatively weak spring is sufficient for this, so that the disadvantages mentioned, as they are associated with an arrangement in which switching on must be carried out solely by a strong closing spring, are avoided.

Claims (1)

Claim: Compressed gas switch with multiple interruption, in which pulse-actuated power switching points are arranged in switching chambers that are constantly under compressed gas and in which there are two coaxial nozzle tubes at a fixed distance from one another, through which the compressed gas flows in the opposite direction to extinguish the arc and a movable one connecting the two nozzle tubes Bridging contact is provided, which is indirectly connected on one side with a pressurized drive piston and on the other side with a valve seat, the nozzle tube opposite the valve seat being provided with a valve plate, which together form the blow valve "for the pressurized gas, according to patent application A 40774 VIIId / 21 c (German Auslegeschrift 1207 990), characterized in that to switch on the bridging contact (6) one side of its drive piston (6 b) with the approximately constant supply or. Steuerd jerk and the other side is acted upon by the switching chamber pressure, which is temporarily artificially lowered after switching off by a throttle point (8) built into the refill line to the switching chamber. 1 sheet of drawings 609 569/327 5.66 © Bundesdruckerei Berlin