US3264439A - Pressure gas operated electrical switch with two stationary main contacts and a movable bridging contact basket - Google Patents

Pressure gas operated electrical switch with two stationary main contacts and a movable bridging contact basket Download PDF

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Publication number
US3264439A
US3264439A US295924A US29592463A US3264439A US 3264439 A US3264439 A US 3264439A US 295924 A US295924 A US 295924A US 29592463 A US29592463 A US 29592463A US 3264439 A US3264439 A US 3264439A
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US
United States
Prior art keywords
contact
basket
fingers
finger
main
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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
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US295924A
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English (en)
Inventor
Ernsting Jurgen
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.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
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BBC Brown Boveri France SA
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Filing date
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Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
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Publication of US3264439A publication Critical patent/US3264439A/en
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    • 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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • H01H1/385—Contact arrangements for high voltage gas blast circuit breakers

Definitions

  • the present invention relates to a pressure gas operated electrical switch which comprises two stationary spaced apart main contact members and a movable bridging contact basket with contact fingers arranged within a switching chamber, the contact basket being associated with a piston type driving member therefor for driving the basket in such direction as to effect disengagement between the basket and one of the stationary contact members when pressurized gas is introduced into the switching chamber, and there being a loading spring cooperative with the contact basket for returning the same into a bridging contact with both of the stationary main contact members when the pressurized gas fiow into the switching chamber is cut off.
  • a compressed gas switch ha become known where a movable switch pin and a fixed tubular nozzle forming the counter-contact are connected by a movable bridging contact.
  • the object of the present invention is to provide a simple solution where the mentioned disadvantages are avoided, the new arrangement being applicable to advantage for switche up to the greatest disconnecting cur- I rents.
  • at least one of the contact fingers, but not all of such fingers be designed as a burn off finger, at which the contact between the bridging contact and the fixed pin-shaped contact is eliminated last during a disconnection operation, the current conduction to the burn-off finger being designed as conductor loop in such manner that during engagement, the contact pressure i increased and later the arc is moved toward the center of the tubular nozzle.
  • FIG. 1 shows, partly in section, an example of construction of the switching chamber of a compressed gas switch according to the invention.
  • FIG. 2 shows another example of construction where the current conduction to the burn-off finger is designed as insulated conductor loop.
  • FIG. 3 shows, partly in section, the elevation of a switching chamber with burn-01f fingers designed as multiple parts.
  • FIG. 4 shows a plan cross-section of the switching chamber according to FIG. 3.
  • FIG. 5 illustrates on a larger scale in perspective a multi-part burn-oft finger as contained in FIGS. 3 and 4.
  • FIG. 6 shows, partly in section, a switching chamber where the contact fingers or laminations transfer the current to the connected part.
  • the fixed pin-shaped contact is designated by 1. It is connected through the ribs 2 with a ring part 3 and is held by the latter in the switching chamber housing.
  • the switching chamber housing 4 consists of insulating material and is firmly connected at its upper side with a cylindrical connector part 5, which in turn is firmly inserted in the insert piece 6.
  • the insert piece 6 carries internally the fixed tube 7, which is fitted on its underside with the nozzle mouthpiece 8 consisting of are proof material, which is firmly connected, for example, by soldering, with the screw insert 9.
  • the bridging contact is guided slidingly. It is formed by the contact basket 10 of insulating material which in turn contains the contact laminations 11 and the burn-off finger 12.
  • the burn-oft finger 12 is covered with arcproof material 12a.
  • the contact pin 1 has at its upper side a burn-off hood 1a.
  • the connector part 5 is provided with an aperture 5a, while 5b indicate the connector lug to which the outer connection is connected in known manner.
  • the contact basket 10 is shown in an intermediate position, where the contact laminations or fingers 11 have already left the contact 1, while the burn-off finger 12 is still in electrical connection with the contact pin 1 by its covering 12a and the burn-off hood 1a.
  • the current path prevailing at this moment is indicated by the winding dash-dot line with arrows.
  • the burn-off finger 12 is so oriented within the contact basket 10 that it is always on the side of the connection lug 5b.
  • the manner of operation of the arrangement is as follows: In the electrically connected position of contact members 1 and 7 the switching chamber is pressureless, the contact basket 10 being in its lower limit position and bridging the nozzle and pin-shaped contacts as a result of the action of the return spring 14.
  • the lower position of basket 10 which then surrounds the upper end portion of the pin-shaped contact 1 is determined by the striking of the slanting lower edge of the basket cams 10a against the slanting upper edge of the mouthpiece 8.
  • the contact laminations or fingers 11 then embrace the contact 1 at its cylindrical part.
  • the current path is formed by parts 5b, 5, 6, 11 and 1.
  • compressed gas is supplied to the switching chamber from below through the annular channel formed between cylindrical parts 1 and 4.
  • the devices needed for this of a kind known in themselves, such as a compressed gas tank and switching valve, have been omitted in the drawing for greater clarity, especially as they are not required for comprehension of the invention.
  • Connection of the switch contacts is effected in known manner by closing the mentioned series arranged knife switch, since the power switch point is again closed in the stationary disconnected position of the switch, in that the bridging contact has been brought by the return spring 14 into its lower limit position after stopping of the compressed gas supply.
  • FIG. 2 another example of construction is illustrated, the parts corresponding to those of FIG. 1 being marked with the same reference symbols.
  • the connector part 5 is so designed that it is inmediate insulating layer 18. In tangential direction, the
  • the width of the yoke 19 is adapted to that of the respective burn-01f finger 12.
  • each has a separate yoke 19 assigned to it, these being possibly also separated from 'each other by intermediate insulating layers.
  • the return spring 14 is arranged in this construction above the connector part 5 and takes support, on the one hand, against the upper collar of the tube 17 and, on the other hand, over the ring 16 and several stay bolts fastened in the contact basket 10, against the latter.
  • the mechanism of action of the arrangement according to FIG. 2 fully corresponds to that as described under FIG. 1.
  • the yokes 19 embedded insulatingly in the connector part 5 an advantageous concentration of the current paths of the conductor loop is brought about and thereby the contact lifting of the one or more burn-off fingers 12 during the disconnectingoperation is prevented in greater degree.
  • the return spring 14 is so arranged that encirclement of the current path is avoided.
  • FIGURES 3 and 4 Another example of construction is illustrated in FIGURES 3 and 4.
  • the arrangement shown here is particularly advantageous for switches having great load current disconnecting capacity.
  • 1, 1a is designated the pin-shaped contact, whose attachment in the switching chamber housing 4 is effected in the same manner by means of parts 2, 3 as in FIGS. 1 and 2.
  • the connector part 5 is of substantially cylindrical design and carries at the top the insert piece 20, into which the nozzle tube 7 is screwed.
  • the contact basket 10 has corresponding recesses for the contact laminations or fingers 11, which apply at the bottom against the contact 1 and at the top against the connector part 5, the leaf springs 13a, 1317 establishing the contact pressure in the connected position.
  • the mechanism of action of the arrangement fully corresponds to that as described in FIG. 1. Due to the antiparallel and closely opposite current paths in the finger parts 12 and 12b there results, upon disconnection of great currents, a particularly effective contact pressure increase at the transition points between the finger parts 12 and 12b on the one hand, and between the finger parts 12b and the connector part 5, on the other. As is evident from FIG. 4, several burn-off fingers 12, 12b may be provided, whereby a favorable current distribution can be achieved. In the chosen example of construction, a total of three-multi-part burn-01f fingers is provided. They are arranged inside the contact basket 10 in such a way that they are always on the side facing the connector flange 5b.
  • FIG. 6 shows another example of construction where the slidable bridging contact is designed, according to the invention, to increase the dynamic strength, in such manner that a particularly advantageous pressure increase in the connected position is achieved.
  • the contact laminations or fingers 11 have a crowned surface 11a, by which, under the axial force of the return spring 14, they apply against the conical inner surface of the connector part 5.
  • the lug part 11b they rest in a recess of the contact basket 10, so that they can execute a small rolling-sliding movement during connection and are then clamped in the manner of a wedging effect, with the result of a multiplication of the contact pressure corresponding to the inclination of the wedge surface.
  • the inner portion of the connector part 5 may advantageously consist of an inserted bushing 5c of highly conductive material.
  • a pressure gas operated electrical switch comprising a pair of co-axially aligned main contact members arranged with their ends in confronting spaced relation within a switching chamber to which a pressurized gas is introduced during electrical disconnection of said main contact members, one of said main contact members being in the form of a nozzled tubular from the other main contact member, said bridging contact assembly being comprised of a contact basket of electrically insulating material in which a circular array of contact fingers are located, said basket serving also as a piston which is slidably actuated upon introduction of pressurized gas into said switching chamber thereby to disengage said contact fingers from said other main contact member, a loading spring for said contact basket to return the same to a position wherein said contact fingers re-engage said other main contact member when the pressurized gas flow to said switching chamber is cut off, an electrically conductive cylindrical connector member surrounding said contact basket and forming a cylinder for the sliding movement thereof, said connector member also including a laterally extending lug to which one electrical connection is made
  • a pressure gas operated electrical switch comprising a pair of co-axially aligned main contact members arranged with their ends in confronting spaced relation within a switching chamber to which a pressurized gas is introduced during electrical disconnection of said main contact members, one of said main contact members being in the form of a nozzled tubular member through which the pressurized gas flows during a contact disconnection, a movable bridging contact assembly arranged for sliding movement upon said tubular nozzled contact member to engage and be disengaged from the other main contact member, said bridging contact assembly being comprised of a contact basket of electrically insulating material in which a circular array of contact fingers are located, said basket serving also as a piston which is slidably actuated upon introduction of pressurized gas into said switching chamber thereby to disengage said contact fingers from said other main contact member, a loading spring for said contact basket to return the same to a position wherein said contact fingers re-engage said other main contact member when the pressurized gas flow to said switching chamber is cut off

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  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US295924A 1962-07-26 1963-07-18 Pressure gas operated electrical switch with two stationary main contacts and a movable bridging contact basket Expired - Lifetime US3264439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH895562A CH395241A (de) 1962-07-26 1962-07-26 Druckgasschalter

Publications (1)

Publication Number Publication Date
US3264439A true US3264439A (en) 1966-08-02

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ID=4346708

Family Applications (1)

Application Number Title Priority Date Filing Date
US295924A Expired - Lifetime US3264439A (en) 1962-07-26 1963-07-18 Pressure gas operated electrical switch with two stationary main contacts and a movable bridging contact basket

Country Status (5)

Country Link
US (1) US3264439A (sv)
AT (1) AT243358B (sv)
BE (1) BE635385A (sv)
CH (1) CH395241A (sv)
DE (1) DE1156471B (sv)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3557331A (en) * 1967-11-06 1971-01-19 Ite Imperial Corp Axially vented contact and interrupter structure for gas blast circuit breakers
DE2602779A1 (de) * 1975-01-31 1976-08-05 Meidensha Electric Mfg Co Ltd Elektrische verbindungseinrichtung
US4501466A (en) * 1977-05-27 1985-02-26 Westinghouse Electric Corp. High current contact
US5770828A (en) * 1995-07-03 1998-06-23 Abb Research Ltd. Power circuit-breaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636961A (en) * 1951-11-09 1953-04-28 Gen Electric Electric circuit breaker
US2937256A (en) * 1957-03-04 1960-05-17 Bbc Brown Boveri & Cie Contact structure for electric switches of the gas blast type
US3076080A (en) * 1961-02-17 1963-01-29 Allis Chalmers Mfg Co Fluid blast interrupting device for oil circuit breakers employing auxiliary contact
US3128360A (en) * 1960-01-14 1964-04-07 Ite Circuit Breaker Ltd Interrupter structure having splitter plates of malleable material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636961A (en) * 1951-11-09 1953-04-28 Gen Electric Electric circuit breaker
US2937256A (en) * 1957-03-04 1960-05-17 Bbc Brown Boveri & Cie Contact structure for electric switches of the gas blast type
US3128360A (en) * 1960-01-14 1964-04-07 Ite Circuit Breaker Ltd Interrupter structure having splitter plates of malleable material
US3076080A (en) * 1961-02-17 1963-01-29 Allis Chalmers Mfg Co Fluid blast interrupting device for oil circuit breakers employing auxiliary contact

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3557331A (en) * 1967-11-06 1971-01-19 Ite Imperial Corp Axially vented contact and interrupter structure for gas blast circuit breakers
DE2602779A1 (de) * 1975-01-31 1976-08-05 Meidensha Electric Mfg Co Ltd Elektrische verbindungseinrichtung
US4501466A (en) * 1977-05-27 1985-02-26 Westinghouse Electric Corp. High current contact
US5770828A (en) * 1995-07-03 1998-06-23 Abb Research Ltd. Power circuit-breaker

Also Published As

Publication number Publication date
CH395241A (de) 1965-07-15
DE1156471B (de) 1963-10-31
BE635385A (sv)
AT243358B (de) 1965-11-10

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