US3272939A - Single or three-phase load-breaking switch with permanent magnet actuator assembly - Google Patents

Single or three-phase load-breaking switch with permanent magnet actuator assembly Download PDF

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Publication number
US3272939A
US3272939A US349094A US34909464A US3272939A US 3272939 A US3272939 A US 3272939A US 349094 A US349094 A US 349094A US 34909464 A US34909464 A US 34909464A US 3272939 A US3272939 A US 3272939A
Authority
US
United States
Prior art keywords
piston
hood
permanent magnet
switch
breaking
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
US349094A
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English (en)
Inventor
Clason Jan Christiaan
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.)
Hazemeijer BV
Original Assignee
Hazemeijer BV
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 Hazemeijer BV filed Critical Hazemeijer BV
Application granted granted Critical
Publication of US3272939A publication Critical patent/US3272939A/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
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/02—Energy stored by the attraction or repulsion of magnetic parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/08—Arrangements to facilitate replacement of a switch, e.g. cartridge housing
    • H01H9/085—Arrangements to facilitate replacement of a switch, e.g. cartridge housing contact separation effected by removing contact carrying element

Definitions

  • a three-phase load-breaking isolating switch for separate switching in and out of the loads on the individual phases having in each phase a fixed contact pair and a movable bridging contact for each fixed contact pair.
  • This bridging contact is movable within a switching hood and is subjected within such hood to spring pressure exerted in inward direction. In the closed condition of the switch the bridging contact is held in place and yieldingly pressed against the fixed contacts through its own armature plate by permanent magnets on the fixed portion of the switch.
  • This known switch has the property, that the controlled circuit can be very quickly opened and the switch therefore makes possible an instantaneous tripping of the load circuit.
  • the switching hood When for opening the load circuit the switching hood is withdrawn from the fixed portion of the switch, the above-mentioned springs in the hood are stressed and the armature plate then frees itself from the fixed permanent magnets, whereupon the movable bridging contact is very quickly withdrawn from the fixed contacts.
  • the invention effects improvements in the above-mentioned known switch such that it not only permits remote control, but also becomes a switch having so-called rapid closure.
  • the invention is applicable both to single-phase and to three-phase switches of the above-mentioned kind.
  • the invention is characterized in that the piston rod of a pneumatic piston is rigidly connected to the movable switching hood of a single-phase load-breaking isolating switch of the above-mentioned kind or to the movable switching hoods of all phases of a three-phase loadbreaking isolating switch of the above-mentioned kind, and in that a plate of magnetically soft material is mounted on the piston rod and is held in place in the open condition of the switch by a fixed permanent magnet system associated with the piston.
  • the drawing shows a framework, into which the known load-breaking isolating switch is built.
  • This framework is illustrated as consisting of a horizontal girder 10 at the top of the framework and two vertical girders 11 and 12.
  • the movable switching hoods 13, 14, 15 of the switch are all secured on a common transverse beam 16 in a manner not of detailed interest here, that is, are connected as a unit to such beam 16.
  • Above a circular opening 17 in the middle of the girder 10 is a cylinder, which consists of a foot 18 and a tube 19 and in Which a piston 20 can slide.
  • annular magnet system consisting of an outer pole ring 22, an inner pole ring 23 and an annular permanent magnet 24 between these two pole rings.
  • the direction of magnetisation of the annular permanent magnet 24 is radial, so that, say, the inner pole ring 23 is the south pole and the outer pole ring 22 the north pole of the permanent magnet.
  • piston rod 25 which is rigidly connected at its upper end to the piston 20 and at its lower end to the beam 16. The elements 26 and 27 shown in the drawing between the piston rod 25 and the piston 20 can for the moment be disregarded.
  • a circular plate 28 of magnetically soft material which in the position of the piston 20 shown lies against the lower end faces of the pole rings 22 and 23 and is held there by the annular permanent magnet 24.
  • the load-breaking isolating switch is thus not only very quickly closed, but also by means of the arrangement illustrated can be actuated from a remote point through a compressed air control conduit.
  • the switch according to the invention if provided with the annular plate 26, represents a marked technical advance, since with the quick opening of the isolating switch described the time intervals between the moments of interruption of the individual phase circuits are so small as to be wholly negligible.
  • An actuator assembly system for a load-breaking isolator switch comprising a movable hood assembly adapted to contain switch contacts which may be opened and closed by movement of the hood between two limiting positions, a housing for conveying controllable pneumatic pressure, a piston reversibly movable within said housing responsive to said pressure, a piston rod rigidly connected to both the movable hood assembly and the piston to move the hood between said limiting positions responsive to the pneumatic pressure, a permanent magnet system afiixed within said housing to intercept respectively the path of said piston and said hood near corresponding ones of the two limiting positions, and two plates of magnetically soft material aflixed to said piston rod respectively near the hood and piston to move therewith and intercept said permanent magnet system to magnetically engage the permanent magnet system at the respective limits and hold said piston rod in place wherefrom the contacts may be changed by breaking the plates away from the magnet quickly only after said pneumatic pressure is changed on said piston to an extent exceeding the holding force of the magnet on said plates.
  • hood assembly comprises three separate hoods each adapted to contain a single phase load-breaking isolating switch, and a member connecting all three hoods to said piston rod for movement of the corresponding switches simultaneously between said tWo limiting positions.

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  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
US349094A 1963-03-04 1964-03-03 Single or three-phase load-breaking switch with permanent magnet actuator assembly Expired - Lifetime US3272939A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN22844A DE1246082B (de) 1963-03-04 1963-03-04 Schnelleinschalt-Vorsatz fuer einphasige oder dreiphasige Schublasttrennschalter

Publications (1)

Publication Number Publication Date
US3272939A true US3272939A (en) 1966-09-13

Family

ID=7342347

Family Applications (1)

Application Number Title Priority Date Filing Date
US349094A Expired - Lifetime US3272939A (en) 1963-03-04 1964-03-03 Single or three-phase load-breaking switch with permanent magnet actuator assembly

Country Status (5)

Country Link
US (1) US3272939A (fr)
BE (1) BE644714A (fr)
DE (1) DE1246082B (fr)
GB (1) GB1062095A (fr)
NL (1) NL6402078A (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509008A (en) * 1949-10-25 1950-05-23 Gen Electric Control for electric water kettles
US2847528A (en) * 1955-02-21 1958-08-12 Donald E Combs Magnetic switch
US2922002A (en) * 1958-03-10 1960-01-19 Morris A Gilman Liquid level control
US3042771A (en) * 1959-09-25 1962-07-03 Aerotec Ind Inc Pressure switch
US3109908A (en) * 1960-09-16 1963-11-05 Gen Motors Corp Magnetically operated electric switch

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2601556A (en) * 1947-10-31 1952-06-24 Essex Wire Corp Snap switch
AT222206B (de) * 1957-11-26 1962-07-10 Voigt & Haeffner Ag Elektrisches Schaltgerät, insbesondere Endschalter
BE600239A (nl) * 1960-02-26 1961-05-29 Hazemeijer Co Lastscheidingsschakelaar

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2509008A (en) * 1949-10-25 1950-05-23 Gen Electric Control for electric water kettles
US2847528A (en) * 1955-02-21 1958-08-12 Donald E Combs Magnetic switch
US2922002A (en) * 1958-03-10 1960-01-19 Morris A Gilman Liquid level control
US3042771A (en) * 1959-09-25 1962-07-03 Aerotec Ind Inc Pressure switch
US3109908A (en) * 1960-09-16 1963-11-05 Gen Motors Corp Magnetically operated electric switch

Also Published As

Publication number Publication date
BE644714A (fr) 1964-09-04
GB1062095A (en) 1967-03-15
DE1246082B (de) 1967-08-03
NL6402078A (fr) 1964-09-07

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