EP0100749A1 - Schaltkammer für einen Druckgas-Leistungsschalter - Google Patents

Schaltkammer für einen Druckgas-Leistungsschalter Download PDF

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Publication number
EP0100749A1
EP0100749A1 EP83730073A EP83730073A EP0100749A1 EP 0100749 A1 EP0100749 A1 EP 0100749A1 EP 83730073 A EP83730073 A EP 83730073A EP 83730073 A EP83730073 A EP 83730073A EP 0100749 A1 EP0100749 A1 EP 0100749A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
contact piece
movable
interrupting
partition
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.)
Withdrawn
Application number
EP83730073A
Other languages
German (de)
English (en)
French (fr)
Inventor
Katsushi Nagami
Takashi Fuji
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Fuji Electric Corporate Research and Development Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd, Fuji Electric Corporate Research and Development Ltd filed Critical Fuji Electric Co Ltd
Publication of EP0100749A1 publication Critical patent/EP0100749A1/de
Withdrawn legal-status Critical Current

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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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
    • H01H33/703—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle having special gas flow directing elements, e.g. grooves, extensions

Definitions

  • the invention relates to a switching chamber for a compressed gas circuit breaker with a cylindrical fixed contact, with a cylindrical movable contact, which is connected to a drive via a drive rod and is arranged concentrically and opposite to the fixed contact, with a movable cylinder, which Surrounding the drive rod so that there is a certain free space between the outer periphery of the rod and the cylinder, with a fixed piston which slides on the inner wall of the movable cylinder and forms a blow chamber with the movable cylinder, and with a cylindrical nozzle, which the contains movable contact piece so that between the end face and the circumference of this contact piece and the nozzle there is a certain free space, one end of the nozzles being provided with a blow-out opening into which the fixed contact piece can be inserted, while the other end with the blow comb he is connected.
  • FIG. 1 shows an exemplary embodiment of a known switching chamber of the blown piston type, as is largely used in compressed gas switches with insulating gases which contain SF 6 or similar gases as extinguishing agents.
  • Such a switching chamber contains as main components a cylindrical fixed contact 1, a cylindrical movable contact 2, which is arranged concentrically and opposite to the fixed contact and can slide on it, a tubular drive rod 3 (partially shown) which is connected to the free end of the movable Switch piece 2 is connected, and an extinguishing device 4th
  • the extinguishing device 4 which is partially shown, consists of a movable cylinder 5 which surrounds the drive rod 3 so that there is a certain free space between the outer periphery of the rod 3 and the cylinder 5, a fixed piston 7, which acts as a guide body for uses the drive rod 3 and is freely movable between the inner wall of the movable cylinder 5 and the outer surface of the drive rod 2 and also forms a blow chamber 6.
  • the extinguishing device 4 contains a cylindrical nozzle 9 made of insulating material, which is fastened to the movable cylinder 5 and is arranged opposite the movable contact piece 2 in such a way that a certain free space is created between the outer periphery of the contact piece 2 and the nozzle 9.
  • Nozzle 9 is provided at one end with a blow-out opening 8, into which the fixed contact piece 1 can be inserted and which is designed to be arc-proof by means of graphite or similar means. The other end of the nozzle communicates with the blow chamber 6 containing the movable cylinder 5 through gas passage openings 5a.
  • the drive moves the movable contact piece 2, the movable cylinder 5 and the nozzle 9 by means of the drive rod 3 in the direction of arrow A.
  • the movable contact piece 2 moves away from the fixed contact piece 1 separates, an arc is drawn between them, and instantaneously a scrubbing gas stream 10, which has been compressed by the driven movable cylinder 5 in the blowing chamber 6, is blown against the arc.
  • the arc 11 is lengthened and cooled, as shown in the upper half of the drawing, before it is interrupted in the zero-current crossing of the alternating current supply.
  • the distance between the end face of the movable contact piece and the end wall of the nozzle 9 can be increased.
  • a so-called backflow occurs when the diameter of the arc is larger than the diameter D 1 of the nozzle opening 8 and the inner diameter D 2 of the movable contact piece 2 .
  • the gas flow ends; as shown in the lower half of FIG. 1, which causes the cooling effect to decrease rapidly as the arc 11a expands toward the blowing chamber 6, so that hot gas 11b flows back into the blowing chamber 6.
  • the present invention has for its object to avoid the aforementioned disadvantage and to provide a switching chamber for a gas pressure switch, in which the arc is cooled much better, so that the occurrence of re-ignition is avoided to improve the performance of the extinguishing gas.
  • the switching chamber contains a partition with a through hole, which is arranged approximately in the middle of the space between the end face of the movable contact piece and the end wall of the nozzle and at right angles to the center line, that the fixed contact piece can be inserted into this through hole and that the partition contains a plurality of gas blowing openings which are located between the end wall of the nozzle and the outer circumference of the movable contact piece.
  • the gas blowing openings are arcuate.
  • the gas blowing openings are advantageously distributed regularly over the circumference of the partition.
  • a partition 12-inside of the nozzle 9 is arranged such that it lies in the middle of the space between the end face of the movable switching element 2 and the outlet opening of the nozzle at right angles to the center line.
  • the partition 12 is disc-shaped with a cylindrical angle piece 12a on its outer circumference and with a central through hole 12c, in which the fixed switching piece 1 concentric to the center line can be introduced.
  • the arcuate openings 12d are made of an arc-resistant material.
  • the distance S 1 between the end face of the movable contact piece 2 and the partition wall 12 and the distance S 2 between the inner end wall of the blow-out opening 8 and the partition wall 12 are based on the required length which is required for cooling the arc.
  • the diameter of the through hole 12c is approximately equal to the diameter D 1 of the blow-out opening 8. It is possible to connect the partition 12 and the nozzle 9 by means of adhesives, screws, caulking or in some other way, they can also be made in one piece from an arc-proof material. In such an arrangement, even when the arc 11 tends to expand toward the blow chamber 6 because the interruption of a large flow clogs the nozzle 9, the arc 11 can be narrowed and expanded until its outer diameter goes slightly beyond the diameter of the through hole 12c.
  • the embodiment described above corresponds to the double nozzle type.
  • the same effect can also be obtained with a single nozzle type in which the drive rod is solid and not tubular.
  • graphite which is arc-proof and conductive, has demonstrated the greater effectiveness of the partition for the blow-out opening 8 for suppressing the arc and the heated gases, even if the blow-out opening is formed from insulating material which forms the nozzle, effect the same backflow prevention.
  • a backflow of an arc and heated gases can be avoided with a barrier made of an arc-proof material.
  • Backflow and backflow effects in the space between the blow-out opening in the nozzle and the end wall of the moving contact can be suppressed, so that it is possible to obtain a blowing piston type switching chamber with improved extinguishing properties.

Landscapes

  • Circuit Breakers (AREA)
EP83730073A 1982-07-19 1983-07-19 Schaltkammer für einen Druckgas-Leistungsschalter Withdrawn EP0100749A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP12544782A JPS5916234A (ja) 1982-07-19 1982-07-19 ガスしや断器のしや断室
JP125447/82 1982-07-19

Publications (1)

Publication Number Publication Date
EP0100749A1 true EP0100749A1 (de) 1984-02-15

Family

ID=14910305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83730073A Withdrawn EP0100749A1 (de) 1982-07-19 1983-07-19 Schaltkammer für einen Druckgas-Leistungsschalter

Country Status (2)

Country Link
EP (1) EP0100749A1 (ja)
JP (1) JPS5916234A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT385147B (de) * 1985-01-18 1988-02-25 Sprecher & Schuh Ag Druckgasschalter
EP3872829A4 (en) * 2018-10-24 2021-12-22 Mitsubishi Electric Corporation GAS BREAKER

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2377695A1 (fr) * 1977-01-18 1978-08-11 Merlin Gerin Interrupteur a autosoufflage a ecran limiteur de l'ecoulement du gaz de soufflage
US4289942A (en) * 1977-07-29 1981-09-15 Westinghouse Electric Corp. Gas-blast circuit-interrupter with multiple insulating arc-shield construction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2377695A1 (fr) * 1977-01-18 1978-08-11 Merlin Gerin Interrupteur a autosoufflage a ecran limiteur de l'ecoulement du gaz de soufflage
US4289942A (en) * 1977-07-29 1981-09-15 Westinghouse Electric Corp. Gas-blast circuit-interrupter with multiple insulating arc-shield construction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT385147B (de) * 1985-01-18 1988-02-25 Sprecher & Schuh Ag Druckgasschalter
EP3872829A4 (en) * 2018-10-24 2021-12-22 Mitsubishi Electric Corporation GAS BREAKER

Also Published As

Publication number Publication date
JPS5916234A (ja) 1984-01-27

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19840309

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19850415

RIN1 Information on inventor provided before grant (corrected)

Inventor name: NAGAMI, KATSUSHI

Inventor name: FUJI, TAKASHI