US3873792A - Contact arrangement for a compressed-gas circuit breaker - Google Patents

Contact arrangement for a compressed-gas circuit breaker Download PDF

Info

Publication number
US3873792A
US3873792A US341472A US34147273A US3873792A US 3873792 A US3873792 A US 3873792A US 341472 A US341472 A US 341472A US 34147273 A US34147273 A US 34147273A US 3873792 A US3873792 A US 3873792A
Authority
US
United States
Prior art keywords
arc
contact
contact pieces
gas
hollow interior
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
US341472A
Other languages
English (en)
Inventor
Marin Heiner
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
Siemens Corp
Original Assignee
Siemens Corp
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 Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3873792A publication Critical patent/US3873792A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • a contact arrangement for a compressedgas circuit breaker wherein the compressed gas is blown through the arc.
  • the contact arrangement includes two contact pieces arranged on a common axis and having respective end faces mutually adjacent to conjointly define a gas therebetween.
  • a switching member is movable between the open and closed positions to electrically join the contact pieces in the closed position and to electrically separate the contact pieces in the open position whereby an arc is drawn when the gap is opened.
  • Each of the contact pieces has a hollow interior for accommodating the discharge of the gas blown through the arc and has an inner inlet surface defining an opening to the hollow interior. The inlet surface extends from the end face into the hollow interior.
  • Each one of the contact pieces has a plurality of even grooves formed in the end face and the inlet surface thereof.
  • Each ofthese grooves is skew at every increment thereof with respect to the common axis and extends tangentially into the opening of the inlet surface.
  • a cooling medium can be pushed through the winding gaps of one or both coils in such a manner that it flows radially outward in the region between the coils. In this manner a stream of quenching gas acts on the arc transversely to the mag netic force of the magnetic field.
  • German Pat. No. 1,212,617 describes a contact arrangement for compressed-gas circuit breakers wherein the location where the power is interrupted consists of two jet tubes which are arranged at a fixed distance from each other and are provided with slots.
  • a magnetic force which drives the are further into the interior of the hollow contacts is exerted on the arc in addition to the gas stream which is initiated during the opening motion.
  • the disadvantage of the known configuration is that an effective magnetic blasting takes place only when the bases of the are are already situated on the end face of the contacts, so that a current loop generating the magnetic blasting field results. This means, however, that at the beginning of the opening motion, when the forces acting on the arc in the sense of a motion inward should be particularly great, the influence of the magnetic blasting is still small.
  • the are is furthermore driven radially inward in the known contact arrangement which means that the gas stream employed is utilized during the blasting of the are only to a small extent.
  • the contact arrangement according to the invention is utilized in a compressed-gas circuit breaker whereat the breaker is switched between open and closed positions.
  • the contact arrangement includes as a feature two contact pieces arranged on a common axis and having respective end faces mutually adjacent to conjointly define a gap therebetween.
  • a switching member is movable between the open and closed positions to electrically join the contact pieces in the closed position and to electrically separate the contact pieces in the open position whereby an arc is drawn when the gap is opened.
  • Each of the contact pieces has a hollow interior for accommodating the discharge of the gas blown through the arc and having an inner inlet surface defining an opening to the hollow interior. The inlet surface extends from the end face into the hollow interior.
  • each one of the contact pieces has a plurality of even grooves formed in the end face and the inlet surface thereof.
  • Each of these grooves is skew at every increment thereof with respect to the common axis and extends tangentially into the opening at the inlet surface.
  • the invention makes it possible to provide the contacts with a shape which produces a magnetic field in the direction of the gas flow in such a manner that a force component which extends transversely to the gas stream as well as a radial component is exerted on the arc in addition to the gas stream.
  • a force component which extends transversely to the gas stream as well as a radial component is exerted on the arc in addition to the gas stream.
  • the shape of the grooves can be obtained in a particularly advantageous manner by cutting with a saw whereby complicated contours can be avoided.
  • the slots are filled with an arc-resistant insulating material in order that the gas flow the region of the end faces of the contact pieces is not distrubed.
  • the insulating material filling the grooves can form a nozzle body arranged in the hollow space of the contact pieces.
  • the nozzle body can be lined on the side which directs the switching gases with an arc-resistant, electrically conductive material, preferably graphite.
  • FIG. 1 illustrates, partially in section, the contact arrangement according to the invention.
  • the contact arrangement constitutes part of a compressed gas circuit breaker of which part of the switching chamber is shown.
  • the closed position of the circuit breaker is shown to the right of the center line and the open position to the left thereof.
  • FIG. 2 shows the end face region, in section, of one of the hollow switching contact pieces of the contact arrangement of FIG. 1.
  • FIG. 3 is an elevation view of the hollow contact piece of FIG. 2.
  • FIG. 4 is a plan view of the end face of the contact piece of FIG. 2.
  • FIG. 5 illustrates a contact piece according to an alternate embodiment of the invention.
  • FIG. 6 is a perspective view of the contact piece according to still another embodiment.
  • FIG. 7 is also a perspective view of the contact piece of FIG. 6 with a portion thereof cut away to afford a sectional view.
  • FIG. I the contact system of a compressed-gas circuit breaker is shown.
  • the circuit-breaker has a switching chamber 1 which can be made of porcelain for example and which contains a gaseous quenching and insulating medium in its interior 2, particularly, sulfur hexafluoride.
  • a gaseous quenching and insulating medium in its interior 2, particularly, sulfur hexafluoride.
  • two mutually adjacent contacts 3, 4 are arranged on a common axis and have respective end faces that conjointly define a gap 6.
  • the two contacts 3 and 4 are electrically connected with each other by means of a switching member 7 which bridges the contacts, while to the left of the center line, the breaker is in the open position wherein the switching member 7 opens the gap 6.
  • the contacts 3,4 have a U-shaped cross-section 8 and are hollow for the discharge of switching gases.
  • the contacts 3, 4 are provided with cuts 9 which are formed by even grooves which extend diagonally to the axis 10 of the contacts and run tangentially into the inner opening 11 of these contacts 3, 4.
  • FIG. 3 shows that the grooves 9 are arranged inclined at an angle of about 45 to the axis 10 of the contacts.
  • FIG. 4 shows that the even grooves 9 which extend inclined at an angle to the axis of the contacts run tangentially into the inner opening 11.
  • this embodiment of theinvention develops a magnetic force which acts upon the arc to cause the arc to rotate about the axis of the contacts.
  • the gas stream which starts simultaneously and is directed toward the interior of the contacts 3, 4 is utilized with greater effectiveness because the arc moves transversely to the gas stream.
  • the slots 9 are filled with an arc-resistant insulating material 14 such as a cycloaliphatic epoxy resin, which forms a nozzle body 15 arranged in the hollow spaced of the contacts 3, 4.
  • the nozzle body 15 carries a lining 16 of an arc-resistant, electrically conductive material such as graphite or the like.
  • the arc can be driven into the interior of the contacts 3, 4 and of the nozzles until it is extinguished so that the foot points of the arc cannot impede the discharge of the switching gases.
  • FIGS. 6 and 7 show a contact (3, 4) provided with the even cuts 9 according to a feature of the invention which run inclined at an angle to the axis 10 of the contacts and which open tangentially into the inner opening 11 of the contact (3, 4).
  • a contact arrangement whereat the circuit breaker is switched between open and closed positions, the contact arrangement comprising two contact pieces arranged on a common axis and having respective end faces mutually adjacent to conjointly define a gap therebetween, each of said contact pieces having a U-shaped section, and a switching member movable between the open and closed positions to electrically join said contact pieces in the closed position and to electrically separate said contact pieces in the open position whereby an arc is drawn when said gap is opened, each of said contact pieces having a hollow interior for accommodating the discharge of the gas blown through the arc and having an inlet surface defining an opening to said hollow interior, said inlet surface extending from said end face into said hollow interior, each one of said contact pieces having a plurality of even grooves formed in the end face and the inlet surface thereof, each of said grooves being skew at every increment thereof with respect to said common axis and extending tangentially into said opening
  • said insulating material being configured as a nozzle body mounted in said hollow interior.
  • said nozzle body having a surface portion at the end face of the corresponding contact piece and having an inner wall, said surface portion and said inner wall conjointly defining a surface for guiding away the gas blown through the arc, and a lining of arc-resistant, electrically conductive material disposed on said surface portion and said inner wall of said nozzle body.

Landscapes

  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US341472A 1972-03-29 1973-03-15 Contact arrangement for a compressed-gas circuit breaker Expired - Lifetime US3873792A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2215929A DE2215929C3 (de) 1972-03-29 1972-03-29 Kontaktsystem für Druckgasschalter

Publications (1)

Publication Number Publication Date
US3873792A true US3873792A (en) 1975-03-25

Family

ID=5840805

Family Applications (1)

Application Number Title Priority Date Filing Date
US341472A Expired - Lifetime US3873792A (en) 1972-03-29 1973-03-15 Contact arrangement for a compressed-gas circuit breaker

Country Status (7)

Country Link
US (1) US3873792A (cg-RX-API-DMAC7.html)
JP (1) JPS497764A (cg-RX-API-DMAC7.html)
CH (1) CH547004A (cg-RX-API-DMAC7.html)
DE (1) DE2215929C3 (cg-RX-API-DMAC7.html)
FR (1) FR2177805B1 (cg-RX-API-DMAC7.html)
IT (1) IT981637B (cg-RX-API-DMAC7.html)
SE (1) SE390678B (cg-RX-API-DMAC7.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181837A (en) * 1976-09-15 1980-01-01 Westinghouse Electric Corp. Compressed-gas circuit interrupter having insulated contacts
US20060121283A1 (en) * 2002-12-20 2006-06-08 Siemens Ag Insulating material piece for an electrical high voltage device and method for production thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2626246B1 (de) * 1976-06-10 1977-11-17 Siemens Ag In druckgasschalter einsetzbares duesenfoermiges geschlitztes kontaktstueck und verfahren zur herstellung dieses kontaktstueckes

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327081A (en) * 1964-11-25 1967-06-20 Allis Chalmers Mfg Co Contact with high resistance material insert
US3417216A (en) * 1965-04-16 1968-12-17 Gen Electric Arc controlling electrodes for switches and gaps

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1088580B (de) * 1958-03-07 1960-09-08 Siemens Ag Leistungsschalter
US3160727A (en) * 1961-10-24 1964-12-08 Gas-blast orifice-type interrupting unit
CH413960A (de) * 1964-12-23 1966-05-31 Bbc Brown Boveri & Cie Kontaktanordnung für Druckgasschalter
GB1095638A (en) * 1965-12-16 1967-12-20 Ass Elect Ind Improvements in or relating to vacuum switch contacts
US3419216A (en) * 1967-07-27 1968-12-31 Leon Lamorie Angelastro Device providing fountain for dance performance therein
DE1765263C3 (de) * 1968-04-25 1979-11-29 Calor-Emag Elektrizitaets-Aktiengesellschaft, 4030 Ratingen Elektrischer Vakuumschalter
GB1210600A (en) * 1968-04-26 1970-10-28 Ass Elect Ind Improvements relating to vacuum switch contacts
GB1217926A (en) * 1968-07-09 1971-01-06 Reyrolle A & Co Ltd Improvements relating to gas-blast circuit-breakers
DE2015528C3 (de) * 1970-04-01 1973-09-13 Siemens Ag, 1000 Berlin U. 8000 Muenchen Vakuumschalter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327081A (en) * 1964-11-25 1967-06-20 Allis Chalmers Mfg Co Contact with high resistance material insert
US3417216A (en) * 1965-04-16 1968-12-17 Gen Electric Arc controlling electrodes for switches and gaps

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181837A (en) * 1976-09-15 1980-01-01 Westinghouse Electric Corp. Compressed-gas circuit interrupter having insulated contacts
US20060121283A1 (en) * 2002-12-20 2006-06-08 Siemens Ag Insulating material piece for an electrical high voltage device and method for production thereof

Also Published As

Publication number Publication date
DE2215929B2 (de) 1979-04-19
CH547004A (de) 1974-03-15
JPS497764A (cg-RX-API-DMAC7.html) 1974-01-23
FR2177805A1 (cg-RX-API-DMAC7.html) 1973-11-09
IT981637B (it) 1974-10-10
FR2177805B1 (cg-RX-API-DMAC7.html) 1977-02-04
SE390678B (sv) 1977-01-03
DE2215929C3 (de) 1981-12-10
DE2215929A1 (de) 1973-10-11

Similar Documents

Publication Publication Date Title
US3789175A (en) Electric compressed-gas circuit breaker
KR100351300B1 (ko) 회로차단기용 복합소호장치
US3632926A (en) Current-limiting circuit breaker having arc extinguishing means which includes improved arc initiation and extinguishing chamber construction
US3679851A (en) Autoextinguishing interrupters
US4453054A (en) Contact apparatus for vacuum switches
US4160140A (en) Contact arrangement for pressurized-gas circuit breaker
US3873792A (en) Contact arrangement for a compressed-gas circuit breaker
US4080521A (en) Quenching contact arrangement for a compressed-gas circuit breaker
US3895201A (en) Contact arrangement for a high-voltage circuit breaker
US4295021A (en) Electromagnetic arc extinction apparatus for switchgear
US3891814A (en) Apparatus for arc quenching
AU638851B2 (en) Puffer type gas-insulated circuit breaker
JPH038050B2 (cg-RX-API-DMAC7.html)
US3855436A (en) Compressed-gas circuit breaker
CS244831B2 (en) Pressure-gass circuit breaker
US3723922A (en) Split hub locking device
US5153397A (en) Gas circuit breaker
US2629036A (en) Circuit breaker
JP7393310B2 (ja) ガス絶縁開閉装置
US4151391A (en) Contact arrangement for a pressurized gas circuit breaker
US4224490A (en) Fluid blast circuit breaker
US2293320A (en) Gas blast circuit breaker
US3196236A (en) High power vacuum circuit breaker contacts and arc-extinguishing means therefor
US1751233A (en) Circuit interrupter
US3925631A (en) Contact arrangement for a high-voltage power circuit breaker