DE6602887U - DEVICE FOR COMPRESSED GAS SWITCH WITH SF6 AS AN EXTINGUISHING MEDIUM AND WITH A CLOSED GAS CIRCUIT. - Google Patents

Description

Ρ.Α.569 282 * 29.10.65

123/65 White

Public limited company Brown, Boveri & Cie., Baden (Switzerland)

ι Equipment for .Druckgasschalter with SFr as extinguishing agent

ΐ and with a closed G&S cycle .

The invention relates to a device for pressure gas switch with SP ^ as extinguishing agent and with a closed Gas cycle in which the switching gases when switching from a live switching chamber through a Insulator in one. Flow in the collecting vessel.

It has become known as a pressurized gas holder with a closed gas circuit and SPg as an extinguishing agent which the switching gases through the waveguide of a bushing pour into a collecting vessel, which is on the end the implementation is built up and carries high voltage. From there, the switching gases pass through its insulating line and a compressor back into the high pressure tank of the switch. In this design it is disadvantageous that the collecting vessel, which takes up a lot of space

288

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is difficult to accommodate and because it is live _?
leads to bulky dimensions of the entire switch.
This disadvantage is particularly evident when you
would like to run the Sohalter in boiler design, as it
is desirable for systems of the encapsulated design. AiASserdsm
the known arrangement has the disadvantage ^ that the under
aem influence of the arc from the extinguishing gas and from the
evaporated · contact material
Dhemisoh aggressive bind and the surface of the insulating tube
attack, creating a conductive layer. Other-r

Very fine powdery compounds are also rarely formed «

could be deposited on the surface of the insulating tube. Already | Old very low amounts of moisture hydrolyze this ver * - I turns, with a conductive layer | which leads to a breakdown of the isolation. 1

The invention provides a remedy. It's up to her to do J

lugrunde, on the one hand, to arrange the collecting vessel in such a way, ^ & ss |

f allowed the dimensions of the switch to be kept small and 1

On the other hand, let the Isola-I flow through a harmful influence of the switching gas \ and its entrained compounds

; or kept away from; earth. According to the invention it is proposed] Let the collecting vessel be earthed and that the insulator through which the switching j; ases flows in its interior has metallic waste

; has shieldings that allow direct contact with the switching |

; ase with the insulator inner wall and prevent the gap I

Space between the shields for every circuit with fresh |

■ Οι

gas flushed sixvd and that between the] the collecting vessel has a coal drain valve

On the basis of the drawing, which one execution st

purifies:

In the Sohaltkannner designated with 1, welct pressurized gas is filled> is the Rohri valve element 2, which has an annular Ant. It is guided in the cylinder 4 and the spring 5 is held in the closed position. An de; s · S compressed gas to the. Opening of the blow valve inserted between the inner stops 2a of the blow valve is the bridging switch 7, which is made up of resilient lamellae and is coupled to the blow valve element 2 in this way. The Bohaltstück 7 provides in the rest position for an Irish connection between the movable S and the fixed switching piece 9. Both switches are located within the blow valve member 2 and are hollow. The contact piece 8 is held at rest by the return spring 10. When switching off, after a blow valve element 2, the contact piece of the last "obald ee?" left inner stop 2a meets the a. The knee 11 is used on the one hand to

r I.

f /

fast contact piece 9 and on the other hand with

11a for fastening the switching chamber 1. It 1

Ring channel 12, which in the rest position d <organs 2 is closed off from switching chamber 1! on the other side, the annular channel 12 opens into the interior of the insulator 14. The latter forms <between the live switching chamber earthed capsule filled with low pressure gas! ters. For this purpose, the lower armati tor is designed in a flange shape and attached to the S '

strengthens, on which at the same time the collecting vessel; is. The knee 11 is set by means of de! Tube 17 inside the insulator 14 away from a further metallic tube 18 which, however, works by means of the insulating piece 1, whereby the tube 18 acts as a control electrode between the inner tube 17 and the outer tube. The insulating piece. 19 also connects <20 to the central tube 18. In axial direction 17, 18, 20 arranged in such a way that they practice: shield the insulating piece 19. At the same time the inner surface of the insulator 14 is protected against switching gases. The insulating piece 19 w <through which the space 15 with the ringf <between the tubes 17, 18 or 18, 20 verbi outer tube 20 is at its lower end © j

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facg vessel 16 in the rest position through the check valve 22 locked, which is under the .Kraft of a weak Sohliessfeder 23 stands.

The mode of operation of the arrangement is as follows

To switch off, pressurized gas is admitted at 6, which acts on the drive piston jj of the blow valve element 2, whereby the latter is moved against the spring 5 Häch left. The Blaaventllorgan 2 stands out from the seal and allows the pressurized gas from the chamber 1 via the annular channel 12 into the To flow to room 135 and pressurize it. in the further course of the movement of the blow valve element 2 meets the left inner stop 2a on the outer collar 8a of the movable contact piece 8 and in this way takes the Contact piece with. The contact pieces 8,9 are now separated and the arcing between them is now known Inflate and then extinguish. The switching gases flow through the contact piece 9 and reach the; Elbow 11 and the pipe I7 in the collecting vessel l6, whereby the backpack valve 22 has opened. By doing that the pipe immersed in the insulator Γ4 and that the tubes 18 and 20 are arranged so that there is an overlap and that Furthermore, the space Γ5 is already filled with compressed gas, this prevents that the switching gases come into direct contact with the

Inner wall of the insulator 14 comman. The overlap of the pipes 17, 18, 20 also prevents the

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Exhaust jet on the wsihd of the Iselier piece 19. But around

dream the Gai5 in the gap between the pipes 17, 18,

To get as pure as possible, the gaps are over

the bores 21 flushed with fresh gas from the rooms I3. After ^;

a time which ι for the safe extinguishing of the arc

is sufficient, at 6 the cylinder space to the right of the drive *

i

piston 3 of the blow valve member 2 is vented so that the latter |

1

moves back into the closed position under the action of spring 5 *

j there. The contact piece 8 also comes under the action of

Return spring 10 in Sohliess te llung. The exhaust process stops

X with it. There is only a short rinsing process,

j which ends with the Bläsvsntilorgan 2 also short

\ , then closes and «I the room IJ About the holes 21

\ has adjusted to the low pressure. In the selected execution

The power switching point (contact pieces 8, 9) only becomes a problem
open for a short time. It is clear that a voltage separation point is arranged in series with the power switching point, which
before closing the power supply stables opens and in the
Switch-off position of the Schaltora takes over the isolation,

The advantage of the new arrangement is that the
contaminated switching gases lfl the collecting vessel, which is grounded

and therefore easily accessible at all times let, stored long g

w until the fine powdery impurities have disappeared

have discontinued. The repatriation of the oaees will then take place

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in a known manner via filter and compressor into the high pressure chamber. The check valve also changes that the contaminated residual gases can flow back into the isolator rooms after the shutdown process.

Claims (2)

- 8 protection requirements: 1. Device for pressure gas switch with SFg as and with a closed gas circuit, in which the voltage is switched on when switching from a comb through an isolator into a collecting vessel and that the Is through which the switching gases flow has metallic shields on the inside prevent direct contact between the switching gases and the isolates and that the gaps between the flushed with fresh gas each time the circuit is switched on, there is a between the insulator and the collecting vessel valve is located. 2. Device according to claim 1, characterized in that the metallic shields are also used as Ste are designed for the isolator. Brown, Bove «IntoU, <Su twain aimi &fli'hM, 3 "'""'" ^! ""'·"■ ^Λ - · ■ -i, _M folunloml. G