DE2625580A1 - High or medium voltage load breaking switch - has compressed gas cylinder compensating pressure losses in arc quenching chamber - Google Patents

Abstract

The load breaking switch is designed to operate at high or high medium voltages, with quenching by means of compressed gas filled quenching chamber. There is a compressed gas cylinder (9) which is integrated with the quenching chamber (1, 1'). The gas cylinder compensates pressure losses in the quenching chamber. Its gas pressure is several times higher than in the chamber (3) to which it is connected by an automatic refilling device.

Description

Pressurized gas load switch

The invention relates to a high-voltage or medium-voltage circuit breaker with a closed, pressurized gas-filled extinguishing chamber housing, a movable one Contact and a fixed mating contact piece.

Such a switch is by the patent application P 2551 625.o-34 known. This patent application describes a load switch with a closed Arcing chamber housing, which in terms of cost-effective mass production with good Mouldability preferably from a pourable or injectable plastic, in particular a thermoplastic material is made.

The extinguishing chamber can use, for example, sulfur hexafluorine as an extinguishing gas contained, which is filled into the extinguishing chamber under a pressure of about 1-3 atmospheres.

The sealing of the passage opening for the movable contact takes place through a flexible sealing sleeve. Investigations showed that the for the production of the sealing sleeve in question material is the extinguishing chamber does not seal completely, but that compressed gas escapes through diffusion over time, so that the gas pressure inside the chamber and at the same time the extinguishing capacity of the Switch steadily decreases.

The present invention was based on the object of the aforementioned To eliminate disadvantage.

According to the invention, this problem was met with in the characterizing part of the first claim indicated means solved.

L; as the provision of a memory built into the arcing chamber housing, aer extinguishing gas under a pressure that is significantly higher than that of the extinguishing chamber gas pressure houses and automatically releases pressurized gas into the extinguishing chamber, has the consequence that the gas loss caused by diffusion is compensated and the gas pressure in the extinguishing chamber can be kept approximately constant without the need for ongoing controls of outside are required.

The height of the gas pressure in the storage tank depends on the diffusion behavior outer sealing sleeve. Investigations have shown that one made of an elastomer Material-made cuff, the gas pressure in the storage tank at least 5-10 times the extinguishing chamber gas pressure should be around over a period of about 20 years to compensate for the pressure loss and to maintain sufficient switching capacity obtain.

It is recommended to use it as an automatic refill device a valve that establishes the connection between the storage housing and the extinguishing chamber. The valve is set so that it opens when the pressure of the extinguishing chamber begins to rise automatically opens a critical value and if the arcing chamber pressure is sufficient automatically closes the memory again.

According to the invention, there is another possibility of automatic refilling in that the storage housing has walls towards the quenching space, which are intended as diffusion walls are designed and a constant diffusion of de pressurized gas from the storage housing cause in the extinguishing room.

Appropriately dimensioned, thin-walled walls would be used as the target diffusion walls thermoplastic parts in question, or there is the possibility of the entire storage housing made of gas-permeable thermoplastic material. That is also not there To fill the storage tank with a pressure that is significantly higher than the pressure of the erosion chamber.

Further features belonging to the invention are set out in the claims and listed in the description below.

The advantage that can be achieved by using the invention is seen in that a closed pressurized gas load switch without great maintenance effort can be used over a relatively long period of time.

Since the storage and extinguishing chamber are structurally combined, a simple one is created and a space-saving arrangement that is easy to use and can be easily replaced if necessary can be.

Exemplary embodiments are shown in the drawing.

1 shows the load switch in the switched-off state in a longitudinal section Fig. 2 switched on the load switch according to Fig. 1 Fig. 3 the load switch with a andexen storage housing also in longitudinal section According to FIGS. 1-3 has the cylindrical arcing chamber housing made of two thermoplastic plastic parts 1 an opening through which the movable, with contact tulip 14 and protective screen 15 provided contact 2 protrudes into the quenching space 3. Contact 2 is with one Cross pin 4 is provided, which is used to guide the axial contact movement in a housing material provided longitudinal groove 5 engages.

The contact lead-through opening is sealed by a attached to the contact 2, pressed by spring washers 6 sealing sleeve 7, which is preferably is made of an elastomeric material. The cuff is made from one Inorganic material existing tube 8 against the thermal effects of the switching arc protected.

The exemplary embodiment according to FIGS. 1 and 2 contains a conductive Iqmaterial, e.g. copper existing storage housing 9, as the electrical connection between the connection contact 1o led to the outside and the soldered-on mating contact piece 11 and the corresponding cross-section for a sufficient Stromtraybarkeit having.

The connection between the contents of the memory and the extinguishing chamber 3 takes place through a valve 12 which reacts automatically at a certain pressure loss.

The connection contact 1o connected to the memory housing 9 is in the Area of the passage through the chamber provided with a screw thread, which is a Screw nut 13 carries a tightening of the storage housing 9 against the arcing chamber housing bottom 1 'enables and secures the storage housing 9 against axial displacement. The edge the sealing collar 7 is located between the storage housing 9 and the arcing chamber housing base 1 'so that it is pressed in by tightening the nut 13. This will the sealing of the compressed gas-filled extinguishing chamber is further improved.

The tube 8 protecting the sealing collar 7 is on the storage housing 9 attached.

The storage housing 9 is indicated from the outside by a dashed line axial bore in the connection contact Io accessible, which is through a not shown Filling valve is sealed. This makes it possible to run the storage tank with gas at any time to fill up.

The arcing chamber housing according to Fiy. 3 cnts !, correct in its fundamental Structure of the embodiment described above. However, the two-part, Thermoplastic storage passages 16 welded by ultrascilall treatment relatively thin-walled nominal diffusion wall 16 '. The wall thickness of the target diffusion wall 16 'is dimensioned in such a way that a predetermined length of under high Pressure stored gas can escape into the quenching space 3, uni its gas losses balance.

It must be taken into account here that in the course of time with decreasing Speicllergasdruck correspondingly less gas released from the diffusion reservoir will.

As a result, the initial pressure of the storage gas must be dimensioned in such a way that that initially more gas than necessary diffuses from the memory and that up to one fixed minimum operating time, the gas diffusion through the storage wall 16 'still sufficient to compensate for the gas losses in the extinguishing chamber.

According to FIG. 3, there is connection contact 17 with the mating contact piece 17 'in one piece. At the connection contact 17 is a in the chamber passage area Copper ring 18 soldered on, which is provided with a screw thread on the outside and a Screw nut 19 for locking the connection contact 17 carries. The bottom part 1 6N of the storage housing 16 is injection-molded onto the copper ring 18 and is supported when tightening the screw nut 19 on the arcing chamber housing bottom 1 'and the edge of the sealing collar 7, while with the target diffusion wall 16 | provided upper part of the storage housing 16 is injection-molded onto the protective disk 20 of the mating contact piece 17 '.

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Claims (7)

Claims 1High-voltage or medium-voltage load switch with a closed, pressurized gas-filled extinguishing chamber housing, a movable one Contact and a stationary mating contact piece, characterized in that within of the arcing chamber housing (1,1 ') compensates for the pressure loss in the arcing chamber Compressed gas storage in the form of a structurally integrated storage housing (9, 16) is provided is, which is a compressed gas filling with a multiple of the pressure of the arcing chamber and via an automatic refilling device (12, 16 ') with the extinguishing chamber (3) communicates. 2. Load switch according to claim 1, characterized in that the Compressed gas storage (9) a pressure loss of the extinguishing chamber by a at a certain Pressure reduction responding valve (12) compensates. 3. Load switch according to one of claims 1 or 2, characterized in that that the storage housing (16) at least one with the quenching space (3) in connection standing wall (16 '), which is designed as a target diffusion wall and a constant diffusion of the compressed gas from the storage housing (16) into the extinguishing chamber (3) causes. 4. Load switch according to one of claims 1 to 3, characterized in that that the compressed gas reservoir (9) consists of an electrically conductive material and the electrical connection through series connection between the inner mating contact piece (11) and the external connection contact (10). 5. Load switch according to one of claims 1 to 4, characterized in that that the conductive memory (9) is also the mechanical support of the fixed Counter contact piece (11) is. 6. Load switch according to one of claims 1 to 5, characterized in that that the connection contact (1o, 17) connected to the storage housing (9, 16) is in the area the chamber passage is provided with a screw thread, which is a Screw nut (13, 19) which prevents the storage housing (9, 16) from being tightened the arcing chamber housing base (1 ') and the storage housing (9, 16) against axial displacement ensures. 7. Load switch according to one of claims 1 to 6, characterized in that that the edge of the extinguishing space (3) to the outside sealing, elastic Sealing collar (7) between storage housing (9, 16t ') and arcing chamber housing base (1 ') and is pressed in by tightening the screw nut (13,19). d. Load switch according to one of Claims 1 to 7, characterized in that that the connection contact (10, 17) is axially pierced, that the bore in the storage housing (9,16) opens and that the storage housing (9,16) by the pressure-tight closable Terminal contact (10, 17) can be refilled from the outside.