US3603753A - Metalclad switchgear using vacuum interrupter elements - Google Patents

Metalclad switchgear using vacuum interrupter elements Download PDF

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Publication number
US3603753A
US3603753A US709013A US3603753DA US3603753A US 3603753 A US3603753 A US 3603753A US 709013 A US709013 A US 709013A US 3603753D A US3603753D A US 3603753DA US 3603753 A US3603753 A US 3603753A
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United States
Prior art keywords
interrupter
vacuum
contact
unit
terminal
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
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US709013A
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English (en)
Inventor
Russell E Frink
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H2033/6667—Details concerning lever type driving rod arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • H01H3/605—Mechanical arrangements for preventing or damping vibration or shock making use of a fluid damper
    • 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
    • H01H33/022—Details particular to three-phase circuit breakers

Definitions

  • a circuit breaker for metalclad switchgear use is provided using vacuuminterrupter elements in substitution of the usually provided magnetic and insulating plate structures. customarily employed A resilient mounting for the inter rupter elements is provided, together with massive end con tact blocks for heat dissipation generated within the vacuuminterrupter elements. A pivoted operating lever, connected to the massive contact block secured to the moving contact of the vacuum-interrupter, is operated by a resilient connection to the insulating operating rod of the circuit breaker. Because of the reduced dimensions, the cubicle dimensions may be drastically reduced, if desired.
  • PATENTEUSEP 7l97i 3503753 SHEEI 3 [1F 3 i iL.JL.J 50 CONTROL, r MODULE j L1 V CONTROL I MODULE r 5 s
  • metalclad switchgear his achieved extensive use within the industry.
  • metalclad switchgear his achieved extensive use within the industry.
  • magnetic air-break arc-chute structures have been employed, such as set forth in U.S. Pat. 3,307,004, issued Feb. 28, 1967, to Samuel A Bottonari, and assigned to the assignee of the instant application.
  • Such magnetic air-break circuit interrupters are rolled on a movable truck into a cubicle, or metalclad switchgear enclosure, for either indoor or outdoor use, and the surrounding grounded housing provides protection to operating personnel.
  • Vacuum-type circuit interrupters have developed, and are, at the present time, of considerable reliability. It is desirable, therefore, to utilize the new type vacuum-interrupter units, of proven integrity, in the metalclad switchgear industry to take advantage of their small size and efficient operation.
  • an object of the present invention to utilize the improved construction of present-day vacuum-interrupter units within metalclad switchgear, and to provide the requisite additional components to render their operation reliable and trouble-free.
  • a truck-mounted switchgear unit incorporating vacuum-type interrupter elements so that a threephase interrupter may be rolled into the cubicle, or metalclad switchgear housing, with the mounting being sufficiently resilient, and provision made for heat conduction from within the interior of the vacuum-interrupter envelopes, so that reliable operation is achieved.
  • the interrupter elements are resiliently supported by a plurality of conducting straps constituting leaf springs, and heat conduction from the evacuated interior of the interrupter elements is transmitted by the utilization of relatively massive split contact blocks clamped to the vacuum-interrupter contacts, so that reliable operation is achieved at a relatively low tempera ture.
  • a contact finger arrangement is used to achieve current conduction between the contact block, clamped to the movable contact rod, and the terminal-bushing termination with contact finger springs so supplied as to efi'ect both adequate contact pressure at the termination, and also at the movable contact block secured to the moving contact rod of the vacuum interrupter element.
  • Still a further object of the present invention is the provision of an improved vacuum-type circuit breaker in which provision is made for a resilient and flexible mounting of the vacuuminterrupter elements, and also provision is additionally provided for the heat generated within the vacuum-interrupted units during circuit interruption.
  • Still a further object of the present invention is the provision of an improved current-transfer arrangement between the moving contact of the vacuum-interrupter and the terminal of the associated bushing structure.
  • Another object of the present invention is the provision of an improved resilient mounting for a vacuum-interrupter unit utilizing a novel resilient contact compression spring between the insulating operating rod and the pivoted actuating lever for the movable contact rod of the vacuum-interrupter.
  • Yet a further object of the present invention is the provision of an improved resilient mounting for a vacuum-interrupter unit to lower the impact forces encountered during the opening and closing operations by a multiple-leaf spring construction, without unnecessarily increasing the number of com ponent parts associated with the vacuum-type circuit interrupter.
  • FIG. I is a perspective view of a truck-mounted mctalclad type of switchgear breaker incorporating vacuum-type inter rupting elements, with the breaker shown in the closed circuit position;
  • FIG. 2 is an enlarged fragmentary side elevational view, par tially in vertical section, of the vacuum-type switchgear structure of FIG. I, the contacts being illustrated in the opencircuit position;
  • FIG. 3 is an enlarged side elevational view of the resilient mounting for the vacuum-interrupter element, together with a showing of the resilient interconnection between the operating rod and the pivoted operating lever, the contact structure being illustrated in the closed-circuit position;
  • FIG. 4 is a diagrammatic view of a prior art type of metalclad switchgear structure using magnetic air-type arc chutes, and illustrating the space required, with the circuit breaker being indicated in the operating and test positions;
  • FIG. 5 is a perspective view of a prior art type of metalclad switchgear structure illustrating the considerable space required.
  • the reference numeral I generally designates a truck mounted three-phase metalclad type of circuit breaker.
  • the three-phase circuit-interrupter unit comprises three vacuum-type circuit-interrupter elements 2, 3 and 4 positioned generally vertically between pairs of horizontally extending terminal bushings 5, 6 the latter being supported by insulating pole supports 7.
  • the pole supports 7 may be formed of porcelain, as set forth and described in U.S. Pat. applica tion, Ser. No. 433,529, filed Jan. 26, l965, by James R. Gamble, entitled Joint Constructions," and assigned to the assignee of the instant application.
  • the three insulating pole supports 7 are bolted, as at 8, to a lower metallic frame support 9, mounted upon wheels 10, and adaptable for insertion and withdrawal within metalclad switchgear cell structure I], as illustrated in FIGS. 5 and 6 of the drawings.
  • a solenoid-operating mechanism, or a stored-energy operating mechanism I3 may be provided within the lower framework 9 of the circuit breaker l, the construction of which constitutes no part of the present invention.
  • FIG, 2 more clearly illustrates the internal construction of the vacuum-interrupter elements, showing the separable con tacts l4, 15 the upper contact 14 being a stationary contact and supported upon a stationary contact rod I6 extending upwardly through the upper end 17 of the vacuum interrupter element and clamped within a relatively massive contact block 18.
  • Clamping bolts I9 may be employed to effect a secure clamping engagement between the contact block 18 and the stationary contact rod extension I6.
  • the relatively massive split contact block I8 is secured, as by brazing,
  • the lower contact strip 21 may have apertures provided therethrough to accommodate mounting studs 22, which may be provided by the manufacturer of the vacuum-interrupter element. Consequently, the mounting nuts 23, secured to the interrupter element mounting studs 22, if provided, together with the secure clamping of the contact block I8 to the upper end portion of the stationary contact rod [6, provides a secure attachment of the interrupter element to the terminal 24 of the upper terminal bushing 25, the latter extending through the upper end of the insulating pole support 7.
  • the lower terminal bushing 27 has a terminal member, designated by the reference numeral 28, and to this is bolted, as at 29, a wide flat supporting member 30, made of a conducting resilient material, such as silicon bronze, for example.
  • a wide flat supporting member 30 made of a conducting resilient material, such as silicon bronze, for example.
  • the fiat support member 30 may be secured to the vacuum-interrupter element by mounting studs 3! supplied with the interrupter element by the manufacturer, and these mounting studs 3I may extend through registering apertures provided in the flat supporting strip 30 and secured thereto by suitable mounting nuts 32.
  • the vacuum-interrupter element itself has simple butt con tacts I4, I5, and they are closed at high speeds. In order to reduce the rebound of these contacts, a certain amount of resiliency must be provided in the interrupter mounting. It will be noticed, in this connection, that the elements 20, 21, and 30 act as leaf springs to provide this resiliency.
  • a split relatively massive contact block 34 Bolted to the lower movable contact rod 33 of the vacuumtype interrupter element 4, which moves in a reciprocally vertical direction, is a split relatively massive contact block 34, which is conductively connected to the lower bushing foot, or terminal 35, by a multiplicity of contact fingers 36. Contact pressure between these contact fingers 36 and the contact block 34 and end terminal 35 of the bushing 27 is provided by compression springs 37
  • the interrupting device as shown in FIG. 3, is in the closed position, and operation between the open and closed positions is effected by the bifurcated operating lever 38.
  • the operating lever 38 is pivoted about a fixed support pin 39, and is connected to the contact lock 34, and moving contact rod 33 by the moving pin 40.
  • the end of the operating lever 38 is rotatably operated by the insulating operating rod 42.
  • the insulating rod 42 has compressed the contact compression springs 43, which bias the operating lever 38 in a counterclockwise direction about the fixed mounting pin 39, and, through the pin 40, holds the interrupter contacts I4, I closed with the required force.
  • the insulating operating rod 42 moves downwardly gathering momen' tum, until the nut 44 at its upper extremity strikes the top 380 of the forked operating lever 38. This opens the interrupter contacts with an impact force, which breaks loose any welds, which may have formed and separates the contacts 14, IS with an initial velocity. The travel of the insulating operating rod 42 is stopped when the required contact separation is reached. During the closing operation, the operating rod 42 is moved upwardly, and the butt contacts within the interrupter strike together with an impact, which is cushioned by the resiliency of the leaf members 20, ZI and 3t) and by the contact compression spring 43. The operating rod 42 continues to move until it reaches the position shown in FIG. 3.
  • FIGS. 4 and 5 diagrammatically illustrate a conventional magnetic air-break circuit interrupter, and the necessity for providing adequate space for the exhaust gases generated within the magnetic-type air-break arc chute 46.
  • FIG. 6 illustrates an outline of the circuit breaker of the present invention as positioned within a metalclad cell 11.
  • the control module 50 FIG. 5
  • the vacuum breaker is considerably smaller thin a con ventional type of magnetic air-break circuit interrupter 46, and surplus space 52, as shown by the crosshatched area, is available to be used for instruments and control. This eliminates the necessity for providing a control module 50, such as illustrated in FIG. 5, and results in a substantial cost improvement.
  • a relatively simple contact finger arrangement 36 has been provided between the lower movable contact block 34 and the terminal-bushing end terminal member 35 by a relatively simple contact finger construction 36 suitably biased by contact compression springs 37.
  • the interposition of the contact compression springs 43 between the movable operating rod 42 and the movable operating lever 38 provide a desired resilient and cushioning action during the closing operation with the additional provision of a shock opening force during the opening operation to break any welds, which may have formed between the separable contacts I4, 15.
  • a truck-mounted multipole vacuum-type circuit interrupter including, in combination:
  • each vertically disposed vacuum-interrupter unit being electrically con nected to upper and lower spaced horizontally disposed terminal bushings
  • the truck additionally carrying an operating mechanism for the simultaneous operation of all the vertically disposed vacuum'type interrupter units;
  • each vacuumtype interrupter unit including at least one flexible conducting strap interposed between the terminal of one of the terminal bushing for each unit and one of the ends of said respective unit.
  • the truck-mounted multipole vacuum-type circuit interrupter ofclaim 1 including;
  • each vacuumtype circuit-interrupter element includes a pair of separable contacts separated within an evacuated enclosure, at least one contact rod supporting one of said contacts extending externally of the evacuated enclosure, and a heat sink comprising a relatively massive contact block secured to the external end of said contact rod.
  • the flexible mounting means includes a plurality of laterally extending flexible conducting straps interposed between the terminals ol the two terminal bushings of each interrupter unit and the ends of said respective interrupter unit.
  • each vacuum-type circuit interrupter element includes a pair of separable contacts separated within an evacuated enclosure.
  • stationary and movable contact rods extending externally of the evacuated enclosure, and a pair of heat sinks comprising relatively massive contact blocks secured to the external ends of said contact rods.
  • each of the vacuum-type interrupter units includes as a part of said flexible mounting means a pair of laterally extending flexible conducting straps extending between the upper end of the respective unit and the terminal of the upper terminal bushing for said respective unit.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
US709013A 1968-02-28 1968-02-28 Metalclad switchgear using vacuum interrupter elements Expired - Lifetime US3603753A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70912468A 1968-02-28 1968-02-28
US70901368A 1968-02-28 1968-02-28

Publications (1)

Publication Number Publication Date
US3603753A true US3603753A (en) 1971-09-07

Family

ID=27108191

Family Applications (2)

Application Number Title Priority Date Filing Date
US709124A Expired - Lifetime US3529111A (en) 1968-02-28 1968-02-28 Bounce-suppressing arrangement for separable electrical contacts
US709013A Expired - Lifetime US3603753A (en) 1968-02-28 1968-02-28 Metalclad switchgear using vacuum interrupter elements

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US709124A Expired - Lifetime US3529111A (en) 1968-02-28 1968-02-28 Bounce-suppressing arrangement for separable electrical contacts

Country Status (5)

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US (2) US3529111A (enExample)
BE (1) BE728927A (enExample)
ES (1) ES363978A1 (enExample)
FR (1) FR2002832A1 (enExample)
GB (1) GB1250954A (enExample)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735065A (en) * 1971-10-26 1973-05-22 Ite Imperial Corp Low profile circuit breaker with staggered terminals
US3783212A (en) * 1971-07-28 1974-01-01 Ite Imperial Corp Contacts for use in vacuum switch arrangements
US3784774A (en) * 1972-08-21 1974-01-08 Ite Imperial Corp Vacuum circuit breaker current transfer and actuation
US3793494A (en) * 1972-11-15 1974-02-19 Westinghouse Electric Corp Draw out type vacuum circuit breaker assembly with hinged barrier
US3920938A (en) * 1974-02-13 1975-11-18 Ite Imperial Corp High voltage circuit breaker unitary pole moldings
US3958093A (en) * 1974-05-03 1976-05-18 Westinghouse Electric Corporation Metalclad switchgear using vacuum interrupter elements with improved resilient supporting means
US3967163A (en) * 1972-11-21 1976-06-29 Westinghouse Electric Corporation Supporting means for the power conductors in circuit breakers
US4005297A (en) * 1972-10-18 1977-01-25 Westinghouse Electric Corporation Vacuum-type circuit interrupters having heat-dissipating devices associated with the contact structures thereof
US4012609A (en) * 1972-11-21 1977-03-15 Westinghouse Electric Corporation Circuit-interrupters using spaced-apart bars for conductor-assemblies
US4233643A (en) * 1978-11-22 1980-11-11 Electric Machinery Mfg. Company Electrical power switching apparatus with sliding fuse drawer and interlock system
EP0058519A3 (en) * 1981-02-12 1983-07-20 Westinghouse Electric Corporation Electrical junction of high conductivity for a circuit breaker or other electrical apparatus
US4933519A (en) * 1988-08-31 1990-06-12 Westinghouse Electric Corp. Contact structure for grounding switch
US6510047B2 (en) * 2000-12-22 2003-01-21 Eaton Corporation Conductive heat sink
CN101840809A (zh) * 2010-03-15 2010-09-22 常州太平洋电力设备(集团)有限公司 带空气缓冲的真空断路器
US20160064171A1 (en) * 2013-03-28 2016-03-03 Abb Technology Ltd Switch Assembly, A Switching Device Comprising A Switch Assembly, A Switchgear Comprising A Switching Device And A Method For Cooling
USD777116S1 (en) * 2014-09-24 2017-01-24 Abb Technology Ag Switching device with front cover
US9865405B2 (en) 2015-02-03 2018-01-09 General Electric Company Fixed contact for joining a bus bar and a sliding contact of an electrical switchgear

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295024A (en) * 1979-09-24 1981-10-13 A. B. Chance Company Spring biased energy absorber for vacuum switch contact shafts
ES1243729Y1 (es) 2020-02-19 2021-04-28 Quijada Pablo Paunero Dispositivo de seguridad y base tripolar
CN112670111B (zh) * 2020-12-17 2021-11-30 国网浙江永康市供电有限公司 一种紧凑型真空固定开关设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE966538C (de) * 1949-01-26 1957-09-19 Licentia Gmbh Schalterzelle mit im Leitungszug liegendem ausfahrbarem Leistungsschalter, insbesondere Druckluftschalter
FR1260754A (fr) * 1960-03-31 1961-05-12 Force Et De Lumiere Electr Soc Nouvelle cellule pour poste protégé de distribution à moyenne tension et à disjoncteur débrochable comportant un dispositif de mise à la terre et un court-circuit des canalisations électriques de départ
US3305657A (en) * 1963-04-01 1967-02-21 Ass Elect Ind Circuit breaker for high power, high voltage networks
US3397293A (en) * 1965-08-13 1968-08-13 Gen Electric Metal-clad switchgear employing vacuum type circuit interrupters

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735896A (en) * 1956-02-21 Damping means for selecting fingers
US2039630A (en) * 1935-07-20 1936-05-05 Bell Telephone Labor Inc Selective switch
US2492009A (en) * 1943-12-11 1949-12-20 Westinghouse Electric Corp Resilient stop and position limiting means for circuit interrupters
US2532468A (en) * 1945-05-31 1950-12-05 Barber Colman Co Movable contact structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE966538C (de) * 1949-01-26 1957-09-19 Licentia Gmbh Schalterzelle mit im Leitungszug liegendem ausfahrbarem Leistungsschalter, insbesondere Druckluftschalter
FR1260754A (fr) * 1960-03-31 1961-05-12 Force Et De Lumiere Electr Soc Nouvelle cellule pour poste protégé de distribution à moyenne tension et à disjoncteur débrochable comportant un dispositif de mise à la terre et un court-circuit des canalisations électriques de départ
US3305657A (en) * 1963-04-01 1967-02-21 Ass Elect Ind Circuit breaker for high power, high voltage networks
US3397293A (en) * 1965-08-13 1968-08-13 Gen Electric Metal-clad switchgear employing vacuum type circuit interrupters

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783212A (en) * 1971-07-28 1974-01-01 Ite Imperial Corp Contacts for use in vacuum switch arrangements
US3735065A (en) * 1971-10-26 1973-05-22 Ite Imperial Corp Low profile circuit breaker with staggered terminals
US3784774A (en) * 1972-08-21 1974-01-08 Ite Imperial Corp Vacuum circuit breaker current transfer and actuation
US4005297A (en) * 1972-10-18 1977-01-25 Westinghouse Electric Corporation Vacuum-type circuit interrupters having heat-dissipating devices associated with the contact structures thereof
US3793494A (en) * 1972-11-15 1974-02-19 Westinghouse Electric Corp Draw out type vacuum circuit breaker assembly with hinged barrier
US3967163A (en) * 1972-11-21 1976-06-29 Westinghouse Electric Corporation Supporting means for the power conductors in circuit breakers
US4012609A (en) * 1972-11-21 1977-03-15 Westinghouse Electric Corporation Circuit-interrupters using spaced-apart bars for conductor-assemblies
US3920938A (en) * 1974-02-13 1975-11-18 Ite Imperial Corp High voltage circuit breaker unitary pole moldings
US3958093A (en) * 1974-05-03 1976-05-18 Westinghouse Electric Corporation Metalclad switchgear using vacuum interrupter elements with improved resilient supporting means
US4233643A (en) * 1978-11-22 1980-11-11 Electric Machinery Mfg. Company Electrical power switching apparatus with sliding fuse drawer and interlock system
EP0058519A3 (en) * 1981-02-12 1983-07-20 Westinghouse Electric Corporation Electrical junction of high conductivity for a circuit breaker or other electrical apparatus
US4933519A (en) * 1988-08-31 1990-06-12 Westinghouse Electric Corp. Contact structure for grounding switch
US6510047B2 (en) * 2000-12-22 2003-01-21 Eaton Corporation Conductive heat sink
CN101840809A (zh) * 2010-03-15 2010-09-22 常州太平洋电力设备(集团)有限公司 带空气缓冲的真空断路器
US20160064171A1 (en) * 2013-03-28 2016-03-03 Abb Technology Ltd Switch Assembly, A Switching Device Comprising A Switch Assembly, A Switchgear Comprising A Switching Device And A Method For Cooling
US9425006B2 (en) * 2013-03-28 2016-08-23 Abb Technology Ltd Switch assembly, a switching device comprising a switch assembly, a switchgear comprising a switching device and a method for cooling
USD777116S1 (en) * 2014-09-24 2017-01-24 Abb Technology Ag Switching device with front cover
USD812018S1 (en) * 2014-09-24 2018-03-06 Abb Technology Ag Switching device with front cover
USD837751S1 (en) 2014-09-24 2019-01-08 Abb Schweiz Ag Front cover for a switching device
US9865405B2 (en) 2015-02-03 2018-01-09 General Electric Company Fixed contact for joining a bus bar and a sliding contact of an electrical switchgear

Also Published As

Publication number Publication date
FR2002832A1 (enExample) 1969-10-31
GB1250954A (enExample) 1971-10-27
US3529111A (en) 1970-09-15
BE728927A (enExample) 1969-08-01
ES363978A1 (es) 1971-01-01

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