US3646294A - Switch - Google Patents
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- Publication number
- US3646294A US3646294A US103023A US3646294DA US3646294A US 3646294 A US3646294 A US 3646294A US 103023 A US103023 A US 103023A US 3646294D A US3646294D A US 3646294DA US 3646294 A US3646294 A US 3646294A
- Authority
- US
- United States
- Prior art keywords
- contact
- shaft
- arm
- cam
- shell
- 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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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
- H01H33/60—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
- H01H33/6661—Combination with other type of switch, e.g. for load break switches
-
- 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
- H01H33/121—Load break switches
- H01H33/125—Load break switches comprising a separate circuit breaker
- H01H33/127—Load break switches comprising a separate circuit breaker movable with a sectionalising contact arm and operated by such movement
Definitions
- a loadbreak switch which can repeatedly open and close a circuit to a load for 200 operations or more at a current of 300 amperes or' more and at a voltage of l3,000 volts or more.
- the switch includes two conductors connected from two fixed ter- [56] References Cited minals.
- An arm is pivoted from one terminal and has a contact at its free end to engage the other terminal. The contact is UNITED STATES PATENTS mounted on the end of a shaft slidable in the arm.
- a vacuum interrupter is mounted in the arm in a position to be actuated g ls? i al and deactuated by axial movement of the shaft relative to the 2480622 8 1949 "200/I46 R arm.
- the interrupter breaks before the contact breaks and l makes after the contact makes. Since the interrupter is nor- 2,773,154 l2/ l956 Williams ..200/14 R mally actuated and deactuated axially, the switch is uncomi g fi g plicated, inexpensive, requires few parts and is compact.
- This invention relates to electrical switches having auxiliary enclosed contacts to make and break after and before, respectively, the main contacts make and break, and more particularly, to a loadbreak switch or the like.
- Loadbreak switches are frequently employed in power distribution applications where the current is in the hundreds of amperes and the voltage is in the thousands of volts. It is thus very important to make such switches as a safe as possible and to make them so that they will work reliably due to the hazard to workmen in the vicinity.
- the vacuum interrupter to prevent the application of one line potential to one main contact and the passage of current through the main contacts during opening and closing thereof. This is true because the interrupter can break high currents at high voltage for a large number of operations whereas theair break contacts melt by the heat created by an arc therebetween and throw off molten droplets of metal.
- the prior art interrupters are usually mounted in a fixed position. Due to the fact that the main switch arm is pivoted and the interrupter is actuated by a linear motion, the mechanism connecting the main switch and interrupter is normally complicated, expensive and requires a large number of component parts. Accordingly, the loadbreak switch is also usually relatively large in size. Otherwise, prior art switches do not work reliably for a large number of operations.
- FIG. 1 is an exploded perspective view of a loadbreak switch constructed in accordance with the present invention
- FIG. 2 is a broken side elevational view of the switch, partly in section;
- FIG. 3 is a rear end elevational view of the switch
- FIG. 4 is a transverse sectional view of the switch taken on the line 4-4 shown in FIG. 2.
- a loadbreak switch is indicated at 10.
- Switch is supported on an insulator 11 that carries a laminated cantilever leaf spring contact 12.
- An upper layer 13 of contact 12 may be made of spring steel.
- An intermediate layer 14 thereof may be made of copper.
- a lower layer 15 thereof may also be made of copper.
- Insulator 11 also carries a yoke 16 which has metal strips 17 and 18.
- Yoke 16 has arms 19 and 20 through which aligned holes 21 are located.
- Switch 10 also includes an arm 22 having a bracket 23 fixed to one end thereof. Bracket 23 has cars 24 and 25 with aligned holes 26 therethrough.
- contact 12 When assembled, contact 12 is fixed to a metal member 27 to engage a contact 28 fixed to a shaft 29 that is slidable into and out of a hollow plastic cylinder 30 of arm 22.
- holes 21 and 26 are held in alignment by a bolt 31, shown in FIG. 3.
- a handle 32 is fixed to a plug 33 in cylinder 30 by Phillips head screws 34, as shown in FIG. 2.
- arm 22 is rotated aboutthe axis of holes 21 until contact 28 engages cam surfaces 35 and 36 of member 27. This pulls shaft 29 outwardly of cylinder 30, and maintains a pair of vacuum interrupter contacts, to be described, separated before contact 28 engages contact 12.
- insulator 11 has smooth cylinder portions 43, 44 and 45.
- Contact 12 and yoke 16 are fixed relative to surfaces 43 and 45, respectively, by substantially identical means.
- a supporting bracket 46 is fixed relative to surface 44 by substantially the same said means.
- Bracket 46 has a hole 47 therethrough for a bolt connection or the like.
- a strap 48 is held in tension around surface 44 by a hook connection with a block 49.
- a set screw 50 is slidable through a hole 51 in bracket 46 and is threaded through block 49.
- a block 52 distributes the stress on the insulator 11 created by turning screw 50 down.
- straps 53 and 54 may be substantially identical to strap 48.
- Blocks 55 and 56 may be substantially identical to block 52.
- Blocks 57 and 58 may be substantially identical to block 49.
- blocks 57 and 58 have holes 59 and 60 therethrough through which pins 61 and 62 are press fit. Pins 61 and 62 are also press fit through corresponding holes in all of the structures surrounding them.
- the mounting means at the right end of the switch 10, as shown in FIG. 2, has a bracket 63 with a hole 64 therethrough for connection to an electrical lead.
- the means at the right end of FIG. 2 also includes a mounting plate 65.
- the means are held together by a screw 66.
- Screw 66 is slidable through corresponding holes in plate 65, members 17 and 18 and bracket 63, screw 66 being threaded only through block 58.
- block 58 has projections 67 and 68.
- Strap 54 has hooks 69 and 70 which fit over projections 67 and 68. See also the similar construction of block 49 and strap 48 in FIG. 3.
- Block 57 and strap 53 also have the same construction but are oriented the same as block 58 and strap 54 in FIG. 3.
- a spool 71 is located around the shank 72 of bolt 31, shown in FIGS. 2 and 3.
- Interrupter 73 includes an evacuated envelope 74.
- Envelope 74 comprises two ceramic cylinders 75 and 76 brazed together and metal end seals 77 and 78 brazed thereto, respectively.
- Interrupter 73 also includes two conductive shafts 79 and 80 having contacts 80 and 81, respectively, which may be brought into engagement with each other, and pulled apart so that the contacts 80 and 81 do not touch each other.
- Shaft 79 is brazed to end cap 77.
- the left end of a bellows 81 is brazed to shaft 80.
- the right end of bellows 81 is brazed to end cap 78.
- the interior of bellows 81 is thus at atmospheric pressure.
- the construction of interrupter 73 inside envelope 74 may be entirely conventional.
- Bracket 23 has a central flange 82 through which shaft 80 projects. Flange 82 is clamped to shaft 80 by conventional clamp means 83.
- a helically coiled spring 84 is positioned between bracket 23 and endcap 78. The purpose of spring 84 is to ensure that contacts 80 and 81 are held apart except when pressed together by the force exerted by contact 12 against member 28.
- a web 86 is fixed inside cylinder 30 by a pin 87.
- Shaft 29 is slidable through web 86.
- pin 85 projects beyond the outer cylindrical surface of shaft 29.
- handle 32 has a portion 88 with a hole therethrough in registration with a corresponding hole through insert 33.
- shaft 79 slides through both of the holes in portion 88 and insert 33.
- Contact 28 terminates in a hollow conductive cylinder 90, as shown in FIG. 2, which is pinned to cylinder 29 at 91.
- Portions 37 and 38 of member 27 are held in fixed positions relative to each other by their integral connection, and also by a bolt 92 which extends therethrough and clamps them together against a resilient spacer 93 serving as a stop to the inward motion of switch 10.
- Bracket 96 has a transverse portion 95, shown in FIGS. 1 and 2, which is fixed to a bracket 96 by screws 97 and 98. Bracket 96, in turn, is fixed relative to insulator 11 by being clamped by screw 99 between contact 12 and block 57.
- the laminations of contact 12 are held together by a rivet 100.
- Contact 12 has a hole 101 therethrough so that an electrical lead may be connected to the contact 12.
- contacts 80 and 81 are closed. Contacts 12 and 28 touch each other.
- arm 22 is raised upwardly, as viewed in FIG. 2.
- Cam surfaces 35 and 36 are shaped and located so that contact 28 will be lifted an amount sufficient to break contacts 80 and 81 before contact 28 separates from contact 12 even though contacts 80 and 81 may resist separation as the result of slight welding.
- shaft 80 of interrupter 73 may be connected to shaft 29, and that shaft 59 may be clamped in flange 22 without departing from the invention.
- spring 84 may be located between end cap 78 and web ,86.
- vacuum interrupters of the conventional type shown at 73 are axially operated.
- the loadbreak switch 10 of the present invention ideally operates interrupter 73 by a single axial motion of contact 28produced by contact 12, or by the combination of contact 12 with member 27.
- a switch comprising: support means; an arm having one end pivoted on said support means; a first contact fixed relative to said support means; a second contact; an auxiliary switch mounted on said arm, said auxiliary switch having third and fourth contacts, said third contact being movable into and out of engagement with said fourth contact; and movable operating means including conductive means connecting said second and third contacts, said operating means being responsive to movement of said second contact during engagement thereof with said first contact to cause engagement of said third contact with said fourth contact after initial engagement of said second contact with said first contact, said second contact being fixed relative to, and carried by, said operating means in a position to engage said first contact when said arm is rotated about it pivot to a corresponding position, said first contact and said pivot being spaced apart.
- auxiliary switch is a vacuum interrupter having first and second conductive shafts, each shaft having one end adapted to abut that of the other, said shafts being located on a common axis, a sealed evacuated envelope for said shafts, said first shaft being sealed through said envelope, a bellows sealing and second shaft to said envelope at a point intermediate the ends of said second shaft, means to mount the other end of one shaft in a fixed position relative to said arm, said operating means including means connected between the other shaft and said second contact.
- each of said cams being substantially planar, said cam surfaces being substantially perpendicular to the cam planes, said planes converging toward said first contact, said cam planes being normal to a common plane, said arm including a dielectric cylinder, said operating means including a shaft concentric with said cylinder and slidable axially therein, said second contact being fixed to said concentric shaft, said second contact having a disc concentric with. said shaft, said shaft having a diameter smaller than the spacing of said cams, said disc having a diameter larger than the spacing of said cams.
- a switch comprising: support means; first and second conductors fixed relative to said support means; an arm having a hollow, cylindrical shell; a first bracket fixed relative to said shell at one end thereof; a second bracket fixed to said second conductor; means to hinge said brackets together so that said arm will pivot about an axis perpendicular to that of said shell; a vacuum interrupter including a sealed evacuated envelope, a first conductive shaft sealed through said envelope, a second conductive shaft, and a collapsible bellows sealing said second shaft to said envelope intermediate said second shaft ends, said interrupter shafts being located concentric with said shell and internally thereof, said second interrupter shaft being movable relative to said first shaft and said envelope, and vice versa, by collapsing said bellows, said first and second shafts being movable from relative positions with their mutually adjacent ends abutting to relative positions with said adjacent ends out of contact with each other; means to hold the nonadjacent end of one of said first and second shafts in a fixed position relative to said arm
- the invention as defined in claim 6, including guide means fixed relative to said support means, said guide means including a first cam having a cam surface, a projection fixed relative to said second contact member to ride on said cam surface, said cam surface being located on the side of said cam opposite to that which extends toward the pivot axis of said arm, said cam surface having a shape and location such that said projection and third shaft are moved away from said pivot axis and said first and second shafts are disengaged before said first contact member touches said second contact 'member, said first cam having a construction and location such that said first and second contact members are insulated from each other except when said first contact member touches said second contact member.
- each of said cams being substantially planar, said cam surfaces being substantially perpendicular to the cam planes, said planes converging toward said first contact, said cam planes being normal to a common plane, said first contact member having a disc concentric with said third shaft, said third shaft having a diameter smaller than the spacing of said cams, said disc having a diameter larger than the spacing of said cams.
- said spring means is an open coil helical spring located between said envelope and said first bracket with the helix axis being the same as that of said shell.
- both of said brackets are made of an electrically conductive material.
- said one of said first and second shafts being electrically connected to said second conductor through both of said brackets, said first contact member and said third shaft both being made of a conductive material, said first contact member being electrically connected to said other shaft through said third shaft, said first and second shafts being insulated from each other except when they abut one another.
- said second contact member is a cantilever leaf spring fixed at the end thereof nearest said one surface portion relative to said first conductor.
Abstract
Description
Claims (13)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10302370A | 1970-12-31 | 1970-12-31 |
Publications (1)
Publication Number | Publication Date |
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US3646294A true US3646294A (en) | 1972-02-29 |
Family
ID=22292951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US103023A Expired - Lifetime US3646294A (en) | 1970-12-31 | 1970-12-31 | Switch |
Country Status (1)
Country | Link |
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US (1) | US3646294A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2925189A1 (en) * | 1979-06-22 | 1981-02-19 | Calor Emag Elektrizitaets Ag | HV vacuum switch - has axial magnetic field arranged to minimise interference in adjacent conductors |
US4484044A (en) * | 1981-07-16 | 1984-11-20 | Fuji Electric Company, Ltd. | Vacuum load switch with a disconnecting switch |
EP0239783A2 (en) * | 1986-04-04 | 1987-10-07 | AEG Sachsenwerk GmbH | High-tension electrical switch installation |
US5168139A (en) * | 1988-09-22 | 1992-12-01 | Siemens Aktiengesellschaft | Load-break switch having a vacuum interrupter and method of operation |
EP0559552A1 (en) * | 1992-03-03 | 1993-09-08 | Gec Alsthom T & D Sa | Load break switch for high nominal intensity and its use in a cell and in a medium voltage installation |
EP0945881A2 (en) * | 1998-03-25 | 1999-09-29 | Elektrotechnische Werke Fritz Driescher & Söhne GmbH | Electrical switch |
EP2067157A2 (en) * | 2006-06-26 | 2009-06-10 | Fci | Vacuum recloser |
US20190371547A1 (en) * | 2012-08-31 | 2019-12-05 | Hubbell Incorporated | Air break electrical switch having a blade toggle mechanism |
US20220224103A1 (en) * | 2012-05-07 | 2022-07-14 | S&C Electric Company | Dropout recloser |
US20230402830A1 (en) * | 2022-04-08 | 2023-12-14 | dcbel Inc. | Photovoltaic rapid shutdown and arc sensing system |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB523674A (en) * | 1939-01-11 | 1940-07-19 | Aron Electricity Meter Ltd | Improvements in or relating to means for preventing sparking in electric switches |
US2469203A (en) * | 1945-12-04 | 1949-05-03 | Gen Electric | Electric switch |
US2472625A (en) * | 1944-05-23 | 1949-06-07 | Gen Electric | Electric circuit breaker |
US2480622A (en) * | 1945-12-04 | 1949-08-30 | Gen Electric | Electric switch |
US2773154A (en) * | 1955-09-19 | 1956-12-04 | Gen Electric | Electric switch |
US2838637A (en) * | 1956-10-15 | 1958-06-10 | Schwager Wood Corp | Circuit interrupting and isolating means for high voltage circuits |
US2872550A (en) * | 1956-09-20 | 1959-02-03 | Schwager Wood Corp | High voltage circuit interrupting and isolating apparatus |
US3038980A (en) * | 1959-12-17 | 1962-06-12 | Gen Electric | Vacuum-type circuit interrupter |
-
1970
- 1970-12-31 US US103023A patent/US3646294A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB523674A (en) * | 1939-01-11 | 1940-07-19 | Aron Electricity Meter Ltd | Improvements in or relating to means for preventing sparking in electric switches |
US2472625A (en) * | 1944-05-23 | 1949-06-07 | Gen Electric | Electric circuit breaker |
US2469203A (en) * | 1945-12-04 | 1949-05-03 | Gen Electric | Electric switch |
US2480622A (en) * | 1945-12-04 | 1949-08-30 | Gen Electric | Electric switch |
US2773154A (en) * | 1955-09-19 | 1956-12-04 | Gen Electric | Electric switch |
US2872550A (en) * | 1956-09-20 | 1959-02-03 | Schwager Wood Corp | High voltage circuit interrupting and isolating apparatus |
US2838637A (en) * | 1956-10-15 | 1958-06-10 | Schwager Wood Corp | Circuit interrupting and isolating means for high voltage circuits |
US3038980A (en) * | 1959-12-17 | 1962-06-12 | Gen Electric | Vacuum-type circuit interrupter |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2925189A1 (en) * | 1979-06-22 | 1981-02-19 | Calor Emag Elektrizitaets Ag | HV vacuum switch - has axial magnetic field arranged to minimise interference in adjacent conductors |
US4484044A (en) * | 1981-07-16 | 1984-11-20 | Fuji Electric Company, Ltd. | Vacuum load switch with a disconnecting switch |
EP0239783A2 (en) * | 1986-04-04 | 1987-10-07 | AEG Sachsenwerk GmbH | High-tension electrical switch installation |
EP0239783A3 (en) * | 1986-04-04 | 1989-12-06 | AEG Sachsenwerk GmbH | High-tension electrical switch installation |
US5168139A (en) * | 1988-09-22 | 1992-12-01 | Siemens Aktiengesellschaft | Load-break switch having a vacuum interrupter and method of operation |
EP0559552A1 (en) * | 1992-03-03 | 1993-09-08 | Gec Alsthom T & D Sa | Load break switch for high nominal intensity and its use in a cell and in a medium voltage installation |
FR2688339A1 (en) * | 1992-03-03 | 1993-09-10 | Alsthom Gec | HIGH CIRCUIT BREAKER WITH HIGH RATED INTENSITY AND APPLICATION TO A CELL AND A MEDIUM VOLTAGE STATION. |
EP0945881A3 (en) * | 1998-03-25 | 2000-06-14 | Elektrotechnische Werke Fritz Driescher & Söhne GmbH | Electrical switch |
EP0945881A2 (en) * | 1998-03-25 | 1999-09-29 | Elektrotechnische Werke Fritz Driescher & Söhne GmbH | Electrical switch |
EP2067157A2 (en) * | 2006-06-26 | 2009-06-10 | Fci | Vacuum recloser |
EP2067157A4 (en) * | 2006-06-26 | 2011-09-21 | Hubbell Inc | Vacuum recloser |
US20220224103A1 (en) * | 2012-05-07 | 2022-07-14 | S&C Electric Company | Dropout recloser |
US11916369B2 (en) * | 2012-05-07 | 2024-02-27 | S&C Electric Company | Dropout recloser |
US20190371547A1 (en) * | 2012-08-31 | 2019-12-05 | Hubbell Incorporated | Air break electrical switch having a blade toggle mechanism |
US10741346B2 (en) * | 2012-08-31 | 2020-08-11 | Hubbell Incorporated | Air break electrical switch having a blade toggle mechanism |
US20230402830A1 (en) * | 2022-04-08 | 2023-12-14 | dcbel Inc. | Photovoltaic rapid shutdown and arc sensing system |
US11923671B2 (en) * | 2022-04-08 | 2024-03-05 | dcbel Inc. | Photovoltaic rapid shutdown and arc sensing system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ITT CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION;REEL/FRAME:004389/0606 Effective date: 19831122 |
|
AS | Assignment |
Owner name: FL INDUSTRIES, INC., 220 SUTH ORANGE AVENUE, LIVIN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ITT CORPORATION, 320 PARK AVENUE, NEW YORK, NY 10022, A CORP. OF DE.;REEL/FRAME:004453/0578 Effective date: 19850629 |
|
AS | Assignment |
Owner name: BANGOR PUNTA INTERNATIONAL CAPITAL HOLDING CORP., Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FL INDUSTRIES, INC.,;REEL/FRAME:004899/0615 Effective date: 19880425 Owner name: BANGOR PUNTA INTERNATIONAL CAPITAL HOLDING CORP., Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FL INDUSTRIES, INC.,;REEL/FRAME:004899/0615 Effective date: 19880425 |