EP0729637A1 - Electrical gas-blast switch - Google Patents
Electrical gas-blast switchInfo
- Publication number
- EP0729637A1 EP0729637A1 EP94931508A EP94931508A EP0729637A1 EP 0729637 A1 EP0729637 A1 EP 0729637A1 EP 94931508 A EP94931508 A EP 94931508A EP 94931508 A EP94931508 A EP 94931508A EP 0729637 A1 EP0729637 A1 EP 0729637A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compression
- piston
- armature
- gas
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/882—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts the movement being assisted by accelerating coils
Definitions
- the invention relates to an electrical pressure gas switch with at least one fixed contact piece and a switching piece that can be moved by a drive, with a compression device with a compression piston and a compression cylinder, at least one of which during the switch-off process of the drive from a switch-on position with Ver ⁇ reduction of one of them begrer th compression chamber ver ⁇ be pushed, and a Arr ⁇ r, which is axially movable by the magnetic field of a abschaltstromerregbaren stator.
- At least one fixed contact piece can be connected to a connecting piece if necessary via a switching piece that can be moved by a drive.
- a compression device with a compression piston and a compression cylinder surrounds the arc space existing between the contact piece and the connection piece.
- the compression piston is displaced relative to the compression cylinder, the compression space delimited by them being reduced in order to generate an extinguishing gas flow.
- an armature is connected to the compression piston via a rod.
- the armature which is formed as part of the piston rod and is made of ferromagnetic material, reaches the effective range of the magnetic field of a stator that is excited by a breaking current. At this moment the compression piston is accelerated in the opposite direction to the movement of the compression cylinder and causes an increase in the extinguishing gas pressure during the switch-off process.
- a known (DE-Al-40 10 006) variant of a drive support by the magnetic effect of the cut-off current contains at least one armature attached to the compression cylinder, which dips into a slot of a yoke during the switch-off process after a partial movement of the compression cylinder and from this point in time supports the compression cylinder movement.
- the object of the invention is to provide a compressed gas switch which, with a comparatively small required stroke of the compression cylinder, enables the arc to be blown with a relatively high initial quenching gas pressure.
- an electrical pressure gas switch of the type mentioned at the outset in that a drive piston is mechanically connected to the armature and delimits a compression chamber, that the compression chamber pressure is applied to the side of the compression piston which faces away from the compression space, so that a compensation chamber pressure increase causes a movement of the compression piston in the direction of the compression cylinder, and that armature and stator are arranged in such a way that the magnetic field already causes an armature movement in the switched-on position of the compression device.
- a major advantage of the invention is that a short-circuit or shutdown current that occurs occurs before the switch is triggered, even in the on position Compression device generates the axial movement of the armature.
- a considerable pressure builds up in the compression chamber, which acts on the side of the compression piston remote from the compression space.
- the compression piston thereby moves towards the compression cylinder, so that the compression space delimited by them is reduced in advance.
- a considerably increased initial pressure builds up in the compression space before the drive starts the actual switch-off process.
- the increased initial pressure of the quenching gas has an advantageous effect on the blowing of the arc igniting during the retraction process.
- the stroke of the compression cylinder can be made shorter accordingly. Depending on the design of the compression chamber, such a low overpressure can be generated in it that the subsequent switch-off movement of the compression cylinder is supported.
- the stator is a coil.
- a design which is preferred in this regard in terms of construction is that the coil consists of a section of a connecting piece, the wall of which is traversed by a radial slot which is wound like a screw.
- FIG. 1 shows a pressure gas switch according to the invention in a sectional view
- FIG. 2 shows the section along II-II according to FIG. 1,
- FIG. 3 shows the section along III-III according to FIG. 1
- FIG. 4 shows the section along IV-IV according to FIG. 2
- FIG. 5 shows the section along V-V according to FIG. 3
- FIG. 6 shows the section along VI-VI according to FIG. 3.
- the gas pressure switch has a fixed contact piece 1 and a contact coaxially opposite it at a fixed distance. closing piece 2.
- the contact piece and the connecting piece can be electrically connected via a movable contact piece 3.
- the switching piece is connected to a mechanical drive 7, not shown, via a switching rod 5 and a drive fork 6.
- the switching piece 3 is firmly connected to a compression cylinder 8.
- the latter delimits a compression space 12 of the compression device 14 with an axially displaceable compression piston 9 with a filling body 10 arranged thereon.
- the compression cylinder 8 is also connected to the drive 7 via the shift rod 5.
- Figure 1 shows the compression cylinder 8 in the switched-on position 16, in which the switching piece 3 is in a position connecting the contact piece 1 with the connecting piece 2.
- the armature 20 In the rear area of the pressure gas switch there is an armature 20 which is arranged in the interior 21 of the rear extension 22 of the connecting piece 2 in an axially slidably insulated manner.
- the armature 20 consists of ferromagnetic material and is connected to a drive piston 24 via a connecting rod 23.
- a positioning spring 25 ensures - insofar as there are no further forces acting on the armature 20 - that the armature is shown above the center line in FIG. 1.
- the continuation 22 of the connection piece 2 is designed as a stator 26 in the form of a coil 27, in that a section 28 of the connection piece 22 is traversed in its wall by a continuous, helically wound radial slot 29.
- the windings are electrically well insulated from one another.
- the drive piston 24 delimits a compression chamber 30, which is in communication via an overflow pipe 31 with a volume VI between a guide part 32 and the side 33 of the compression piston 9 facing away from the compression space 12.
- a tension spring 34 which is attached at one end to the open end of the overflow pipe 31 facing the compression chamber 30 and at its other end to a stop guide 35 ( Figure 6) is fixed.
- the tension spring 34 serves as a positioning spring in order to bring the compression piston into the rest position shown in the upper half of FIG. 1.
- the pressure in the compression space 12 increases considerably. If a maximum permissible nominal current (cut-off current or short-circuit current) is exceeded, the switch then opens and the drive moves the compression cylinder 8 in the direction of the arrow A.
- the switching element 3 runs from the Fixed contact piece 1 ignites an arc between contact piece 1 and switching piece 3. Due to the increased initial pressure of the extinguishing gas in volume V2, the arc is particularly strongly blown at the beginning, which has an advantageous effect on the extinguishing process.
- the compression cylinder stroke to be performed by the drive can be correspondingly reduced by the extinguishing gas initial pressure, which is increased beforehand by utilizing the overcurrent energy, and the compression piston 9 moved in advance. As illustrated in FIG.
- the advance movement of the compression cylinder can be limited by a longitudinal groove 40 as a stop guide.
- the compression piston can also be locked in the advanced position.
- the pressure in volume VI can be designed accordingly of the compression chamber 30, even when the compression piston 9 is advanced, are so high that the subsequent compression cylinder movement is supported by the pressure acting on the further closure disk 42 (FIG. 2) of the guide part 32.
- the bottom of the guide part 32 contains an end plate 42 with at least one valve 43 (FIGS. 2, 4).
- the valve includes spring-loaded guide pins 45.
- the filler body 10 and the compression piston 9 form a unit which can slide in a gas-tight manner in the axial direction on the guide part 32 (FIG. 1) and with respect to the compression cylinder 8 and contain at least one valve 50 (FIGS. 3 and 5) (representations enlarged in each case).
- the covers 52, 53 of the valves 43, 50 are closed before the start of the movement.
- the guide pins 45 of the valve 43 press against the cover 53 of the valve 50.
- the valve 50 blocks the volume V2 by means of a built-in spring 54 against overflow of extinguishing gas from the volume V2 into the volume VI. Accordingly, extinguishing gas is compressed in the volume V2, while the volume VI to be enlarged is filled via the valve 43.
- valve 43 When the compressed gas switch is switched on, the valve 43 is closed.
- the pressure built up in the volume VI opens the valve 50 against the closing force of its springs, so that extinguishing gas can flow from the decreasing volume VI into the volume V2 which increases during switching on.
- the valve 50 is only brought into its closed position against the force of the spring 54 by the guide pins 45 of the valve 43 when the switch-on position 16 is reached.
Landscapes
- Circuit Breakers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4339923 | 1993-11-19 | ||
DE4339923A DE4339923A1 (en) | 1993-11-19 | 1993-11-19 | Electric gas pressure switch |
PCT/DE1994/001298 WO1995014303A1 (en) | 1993-11-19 | 1994-10-27 | Electrical gas-blast switch |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0729637A1 true EP0729637A1 (en) | 1996-09-04 |
EP0729637B1 EP0729637B1 (en) | 1997-07-09 |
Family
ID=6503248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94931508A Expired - Lifetime EP0729637B1 (en) | 1993-11-19 | 1994-10-27 | Electrical gas-blast switch |
Country Status (6)
Country | Link |
---|---|
US (1) | US5742016A (en) |
EP (1) | EP0729637B1 (en) |
JP (1) | JPH09505180A (en) |
CA (1) | CA2176954A1 (en) |
DE (2) | DE4339923A1 (en) |
WO (1) | WO1995014303A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19629475A1 (en) * | 1996-07-10 | 1998-01-15 | Siemens Ag | Pressurized gas circuit breaker |
DE19745550A1 (en) * | 1997-10-10 | 1999-04-15 | Siemens Ag | Gas-blast circuit-breaker arrangement |
DE10355535B4 (en) * | 2003-11-27 | 2009-08-27 | A. Raymond Et Cie | Device for the sealed connection of two end pieces |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3549842A (en) * | 1966-11-21 | 1970-12-22 | Westinghouse Electric Corp | Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means |
US3745281A (en) * | 1970-02-20 | 1973-07-10 | Hitachi Ltd | Gas-blast circuit breaker having a floating puffer piston driven by electromagnetic force |
DE2319836C3 (en) * | 1973-04-17 | 1981-12-24 | Hitachi, Ltd., Tokyo | Circuit breaker |
US4041263A (en) * | 1975-08-22 | 1977-08-09 | General Electric Company | Electric circuit interrupter of the puffer type comprising a magnetically actuated piston |
CH594977A5 (en) * | 1976-03-29 | 1978-01-31 | Bbc Brown Boveri & Cie | |
CH594281A5 (en) * | 1976-05-24 | 1978-01-13 | Bbc Brown Boveri & Cie | |
DE3141324C2 (en) * | 1981-10-17 | 1986-02-06 | BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau | Circuit breaker |
DE3231169A1 (en) * | 1982-08-21 | 1984-02-23 | BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau | Puffer circuit breaker |
DE4010006A1 (en) * | 1990-03-26 | 1991-10-02 | Siemens Ag | Electrical pressure gas circuit breaker with mechanical compression - quenches gas and has conductor through which current flows in longitudinal direction surrounded by at least one ferromagnetic body |
DE4010007A1 (en) * | 1990-03-26 | 1991-10-02 | Siemens Ag | Pressure gas circuit breaker with driven compression cylinder |
-
1993
- 1993-11-19 DE DE4339923A patent/DE4339923A1/en not_active Withdrawn
-
1994
- 1994-10-27 US US08/646,369 patent/US5742016A/en not_active Expired - Fee Related
- 1994-10-27 JP JP7514147A patent/JPH09505180A/en not_active Withdrawn
- 1994-10-27 DE DE59403330T patent/DE59403330D1/en not_active Expired - Fee Related
- 1994-10-27 WO PCT/DE1994/001298 patent/WO1995014303A1/en active IP Right Grant
- 1994-10-27 CA CA002176954A patent/CA2176954A1/en not_active Abandoned
- 1994-10-27 EP EP94931508A patent/EP0729637B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9514303A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5742016A (en) | 1998-04-21 |
EP0729637B1 (en) | 1997-07-09 |
DE4339923A1 (en) | 1995-05-24 |
WO1995014303A1 (en) | 1995-05-26 |
JPH09505180A (en) | 1997-05-20 |
DE59403330D1 (en) | 1997-08-14 |
CA2176954A1 (en) | 1995-03-26 |
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