US3739124A - Blast piston circuit breaker - Google Patents

Blast piston circuit breaker Download PDF

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Publication number
US3739124A
US3739124A US00242380A US3739124DA US3739124A US 3739124 A US3739124 A US 3739124A US 00242380 A US00242380 A US 00242380A US 3739124D A US3739124D A US 3739124DA US 3739124 A US3739124 A US 3739124A
Authority
US
United States
Prior art keywords
contact
contact pin
piston
stationary
blast
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.)
Expired - Lifetime
Application number
US00242380A
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English (en)
Inventor
F Richter
H Schramm
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US3739124A publication Critical patent/US3739124A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H33/88—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
    • H01H33/90—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 this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—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 this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas

Definitions

  • the circuit breaker is provided with a stationary contact, made hollow for the removal of switching gases, and a movable contact pin which is movable with the blast cylinder relative to the stationary piston.
  • the length of the contact pin is such that the contact pin separates from the contact only when the free volume of the blast cylinder is reduced to one-half.
  • the end of the blast cylinder slides on a tube surrounding the contact which tube has a bent end face spaced in opposition to a metal part enclosed by the stationary piston to define a planar spark gap, the diameter of which is twice as large as that of the movable contact pin.
  • This invention relates to a blast-piston circuit breaker, particularly, for high voltages. More particularly, this invention relates to a switching device for a high-voltage blast-piston circuit breaker.
  • Blast-piston circuit breakers have been known, for example, as in German published Pat. application No. 1,913,973, in which two hollow stationary electrodes, designed as nozzles have been connected in a closed position by a movable contact pin.
  • the contact pin has been coupled to a blast piston which together with a cylindrical outside surface of one of the nozzle contacts defines a compressible space.
  • the outside diameter of the nozzle electrode has been made as large as possible, in order to obtain favorable dielectric conditions. This, however, has the result that the are forming at the outer edge of the electrodes must travel relatively far to arrive at the interior of the nozzle electrode, where the most intensive exposure to the blast occurs.
  • the blast-piston circuit breaker has a stationary contact which is hollow for the purpose of removing switching gases and which is surrounded, in known manner, by a tube having a bent over end disposed perpendicularly to the axis of the contact pin.
  • a movable contact pin which is movable together with a blast cylinder is slidably disposed to slide between the stationary contact and tube.
  • the blast cylinder slides over a stationary piston and includes a bent over end which slides over the tube surrounding the stationary contact to form an enclosed space.
  • the movable contact pin is made so long that separa tion of the movable contact pin from the stationary contact occurs only when the free volume of the blast cylinder is reduced to one-half. Further, the edge of the tube about the stationary contact and a metal part enclosed by the stationary piston are arranged opposite each other as the electrodes of a planar spark gap, the diameter of which is twice as large or larger than that of the movable contact pin.
  • the tube with the rim on the one side, and the metal part enclosed by the piston, on the other side, thus provide an electrode surface of large area and high dielectric strength.
  • the contact pin on the other hand, can be dimensioned independently, according to the requirements of current conduction and are quenching.
  • the arc can therefore travel easily into the interior of the hollow contact where provision is made for a particularly intensive exposure to the blast by a streamlined construction.
  • the relatively large diameter of the tube provides a large blast volume, as the blast cylinder rests on the outside surface of the tube via the inward-bent end face.
  • the bent over edge of the tube covers over contact fingers which surround the stationary contact and rest on the outside on the movable contact pin which surrounds the stationary contact in the closed position.
  • the radial distance between the stationary contact and the contact pin is preferably smaller than that between the contact pin and the edge of the tube.
  • the arc has then no reason to originate at the edge of the tube and commutates quickly to the stationary contact.
  • the metal part opposite the tube edge can be of annular body of U-shaped cross section which faces the contact pin.
  • the open side of this annular body can be filled with insulating material which can be used in some cases, to contribute to the quenching of the arc by giving off gas. In general, however, the arc should be extinguished before being able to act on the insulating material.
  • the drawing illustrates a cross-sectional view of a very-high voltage power circuit breaker according to the invention with the upper half shown in a closed position and the lower half shown in an open position.
  • the circuit breaker includes a contact carrier 1 consisting of aluminum which leads to a terminal (not shown) and mounts a metal tube 2 thereon by means of screws 3 which pass through a flange 4 of the tube 2.
  • a metallic intermediate body 5 is screwed into the end of the tube 2 and has a central threaded hole 6 in which a further metal tube 7 is screwed as a stationary contact.
  • the hollow stationary contact 7 is equipped at the free end with a streamlined insert 8 of burn-off resistant material, for instance, a compact tungsten material.
  • the contact 7 is surrounded by a tube 9 which is screwed onto the intermediate body 5 and which is provided at the free end with an inward-bent rim 10.
  • a covered hollow space is thereby formed which accommodates contact fingers 11 which are spring loaded by suitable springs as shown.
  • a movable contact pin 12 which is equipped at the tip with a burn-off resistant insert 13 engages over the stationary contact 7 in the closed position of the circuit breaker. In this closed position, the contact pin 12 connects the stationary contact 7 with a sliding contact 14 which is formed by contact segments 15. The segments 15 are pressed by suitable springs 16 and 17 against the contact pin 12 on the one hand, and on the other hand against a stationary ring 20 which is fastened to a contact carrier 21.
  • the contact carrier 21 leads to a second terminal (not shown).
  • the contact pin 12 is connected via rods 22 and a star-shaped guide member 23 with a blast cylinder 25 which consists of insulating material and has a free end face 26 which is essentially conically tapered so that an edge 27 rests on the tube 2 in the closed position.
  • a blast cylinder 25 which consists of insulating material and has a free end face 26 which is essentially conically tapered so that an edge 27 rests on the tube 2 in the closed position.
  • the piston 30 is bolted via bolts, as shown, to a metal flange 32 which is disposed at the free end of the contact carrier 21.
  • the metal flange 32 is in metallic connection with the sliding contact 14 via the ring 20 as shown.
  • a metal ring 34 of essentially U-shaped cross section is secured to the sliding contact 14 and is disposed within the piston 30.
  • the hollow space of the ring 34 is lined with a plastic material 35.
  • the side 36 of the metal ring 34 which faces the stationary contact 7 constitutes a planar electrode which has a large diameter as compared to the distance to the stationary contact 7.
  • the associated counterelectrode is also a planar electrode, as such is formed by the rim 10 of the tube 9.
  • the outer diameters of the rim l0 and side 36 are each twice as large as the diameter of the contact pin 12.
  • the circuit breaker operates with sulfur hexafluoride as a quenching medium.
  • the current breaker is of simple construction such that movement of the blast cylinder 25 together with the contact pin 12 suffices to generate the flow of the quenching medium.
  • the contact pin 12 is in engagement with the stationary contact 7 over a relatively long distance and depth of penetration into the tube 5
  • a sharp blast on the breaking arc is obtained as soon as the compressed gas is discharged through the bore in the contact pin 12, on the one hand, and through the bore in the stationary contact 7 upon movement of the contact pin 12 away from the stationary contact 7.
  • the stream of quenching gas flows in the gap between the planar electrodes 10, 36 radially inwardly and drives the arc toward the burn-off insert 8.
  • the arc reaches the region of the most intensive exposure to the blast in a short time.
  • a high dielectric strength exists at the switching device as the planar electrodes 10, 36 cause in a uniform field distribution, with which the smaller spacing shown achieves a dielectric strength of 30 to 50 kilovolts per centimeter (kV/cm) in an sulfur hexafluoride (SP atmosphere at an overpressure of, for instance, 2 atmospheres.
  • a blast-piston circuit breaker having a hollow stationary contact
  • a contact pin of predetermined outer diameter movably mounted with respect to said stationary contact between a first position in engagement with said stationary contact and a second position axially spaced from said stationary contact;
  • a tube surrounding said stationary contact and having an edge bent perpendicularly to the longitudinal axis of said stationary contact to form a planar electrode having an outer diameter at least twice as large as said diameter of said contact pin;
  • a blast cylinder slidably mounted over said piston and having an inwardly bent end slidably disposed on said tube for movement with said contact pin;
  • a metal part disposed within said piston in spaced facing relation to said edge of said tube to form a planar electrode and to define a planar spark gap therebetween, said metal part having an outer diameter at least twice as large as said diameter of said contact pin.

Landscapes

  • Circuit Breakers (AREA)
US00242380A 1971-04-30 1972-04-10 Blast piston circuit breaker Expired - Lifetime US3739124A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712122183 DE2122183A1 (de) 1971-04-30 1971-04-30 Blaskolbenschalter

Publications (1)

Publication Number Publication Date
US3739124A true US3739124A (en) 1973-06-12

Family

ID=5806912

Family Applications (1)

Application Number Title Priority Date Filing Date
US00242380A Expired - Lifetime US3739124A (en) 1971-04-30 1972-04-10 Blast piston circuit breaker

Country Status (5)

Country Link
US (1) US3739124A (de)
CH (1) CH534954A (de)
DE (1) DE2122183A1 (de)
FR (1) FR2134376B1 (de)
IT (1) IT953795B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881079A (en) * 1972-11-03 1975-04-29 Siemens Ag Compressed-gas electric circuit breaker
US3939317A (en) * 1973-09-18 1976-02-17 Siemens Aktiengesellschaft Electric compressed-gas circuit breaker
US4486635A (en) * 1983-07-05 1984-12-04 Westinghouse Electric Corp. High-voltage circuit breaker with improved puffer means
US5728988A (en) * 1993-12-17 1998-03-17 Siemens Aktiengesellschaft High-voltage power switch with a field electrode

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3113325A1 (de) * 1981-03-30 1982-06-24 Ernst Prof. Dr.techn.habil. 1000 Berlin Slamecka Hochspannungsschaltkammer
DE8907092U1 (de) * 1989-06-07 1989-08-10 Siemens AG, 1000 Berlin und 8000 München Druckgasschalter
DE4402935A1 (de) * 1994-02-01 1995-08-03 Abb Patent Gmbh Kontaktsystem für einen Hochspannungsleistungsschalter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1913969C3 (de) * 1969-03-14 1980-05-08 Siemens Ag, 1000 Berlin Und 8000 Muenchen Hochspannungs-Leistungsschalter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881079A (en) * 1972-11-03 1975-04-29 Siemens Ag Compressed-gas electric circuit breaker
US3939317A (en) * 1973-09-18 1976-02-17 Siemens Aktiengesellschaft Electric compressed-gas circuit breaker
US4486635A (en) * 1983-07-05 1984-12-04 Westinghouse Electric Corp. High-voltage circuit breaker with improved puffer means
US5728988A (en) * 1993-12-17 1998-03-17 Siemens Aktiengesellschaft High-voltage power switch with a field electrode

Also Published As

Publication number Publication date
IT953795B (it) 1973-08-10
FR2134376A1 (de) 1972-12-08
CH534954A (de) 1973-03-15
DE2122183A1 (de) 1972-11-16
FR2134376B1 (de) 1977-12-23

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