US3092699A - Electrodynamic force-compensation pressure contacts for circuit breakers - Google Patents

Electrodynamic force-compensation pressure contacts for circuit breakers Download PDF

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Publication number
US3092699A
US3092699A US860186A US86018659A US3092699A US 3092699 A US3092699 A US 3092699A US 860186 A US860186 A US 860186A US 86018659 A US86018659 A US 86018659A US 3092699 A US3092699 A US 3092699A
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United States
Prior art keywords
conductor
contacts
contact
stationary
current
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Expired - Lifetime
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US860186A
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English (en)
Inventor
Latour Andre
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.)
Merlin Gerin SA
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Merlin Gerin SA
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    • 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
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force

Definitions

  • FIGURES 14 to 16 and 17 to 19 of the patent corresponding to the diagram of FIGURE 4 of the patent, I described a device in which a second stationary conductor is connected in series with the first named stationary conductor and extends parallel to the same, and is disposed in a position to react magnetically, in the closed position of the contacts, with said movable conductor to urge the movable contact against the stationary contact.
  • FIGURES 1 and 2 represent schematically and according to a known arrangement, the path of the current in the incoming and outgoing conductors of the contact members.
  • FIGURES 3 and 4 show schematically the novel arrangement, according to the invention, of the incoming and outgoing conductors.
  • FIGURES 5 and 6 show schematically another arrangement proceeding from the same inventive idea.
  • FIGURE 7 shows in side elevation, partly in section, an embodiment according to the schematic arrangement shown in FIGURES 3 and 4.
  • FIGURE 8 is a plan view of FIGURE 7.
  • FIGURE 9 represents in side elevation another form of execution of the contact arrangement, still according to the schematic arrangement shown in FIGURES 3 and 4.
  • FIGURE 10 is a horizontal section view taken along the line 1l lt ⁇ of FIGURE 9.
  • FIGURE 1 is a schematic elevational view of the conductors connected to the contact members, taken in a plane perpendicular to the plane wherein the contacts are moving. 4
  • FIGURE 2 is a side view of the same conductors, the arrangement as shown by FIGURES l and 2 being already shown in my US. Patent No. 2,821,594.
  • P represents, for instance, the surface of the fixed contact member and p that of the movable contact member, L1, L2 the conductors carrying the current to the contact P, 1 the conductor carrying away the current from the contact p.
  • the movable contact 12 and its conductor 10 are not shown in FIGURE 1.
  • FIGURES 3 and 4 show, with the same reference numerals used in FIGURES 1 and 2, an arrangement according to the invention.
  • FIGURES 5 and 6 it is possible to obtain much greater compensation effects, together with a contact device of much smaller dimensions, by combining in series two arrangements similar to the one shown in FIG- URES 3 and 4. So, thus, in FIGURE 6, the rear conductor L is divided as above into two conductors Ll and LZ which are prolonged by two conductors LL, and return to the contact P by the conductors L1 and L2 placed in close proximity to the conductors L1 and L2.
  • the new arrangement of this invention allows not only a multiplication of the forces of compensation, but is particularly advantageous when the two contacts have to withstand a rupturing arc, because in this case, the magnetic field created by the two coils provides an excellent means of obtaining magnetic blow-out.
  • loops shown in the various figures have a rectangular shape, it is obvious that when the maximum resistance to the electrodynamic forces must be obtained, these coils may readily be given a circular shape.
  • FIGURE 7 is a schematic elevation and sectional view of the contact arrangement according to FIGURES 3 and 4, and FIGURE 8 is a plan view of FIGURE 7.
  • the contact surface of the fixed contact P is obtained by means of two deep-drawn shells I placed face to face. At the contact point, the edges of the shells form a recess into which penetrates the contact surface of the movable contact member 17, in such a manner that at least two contact points are always obtained.
  • Each shell extends towards the bottom by virtue of a jaw 2.
  • the two jaws forms the conductors L1 and L2 in FIGURES 3 and 4.
  • one or more slits 3, 4 and 5 are provided in the jaws.
  • the jaws are fixed onto a central piece 6 as by means of the rivets 7, 8, 9 and 10.
  • the rivets 8, 9 and 10 are provided with insulating sleeves and insulating washers so that no current can flow from the piece 6 into the jaw 2 in the region of said rivets 8, 9 and 10.
  • the rivet 7, which exerts a clamping action on the two jaws 2, directly or through a metallic washer is not insulated. It is only in the neighborhood of the rivet 7 that the current can flow from the piece 6 into the jaws 2.
  • the left end of the piece 6 is clamped between two flat pieces 11 as by means of the rivets 12, 13 and 14, the fiat pieces I]; being intended to carry the incoming current of the circuit-breaker to the fixed contact at 1.
  • the rivets l2 and 13 are provided with insulating sleeves and insulating washers so that no current can fiow from the fiat pieces 11 into the piece 6 through these rivets.
  • the rivet 14, which exerts a clamping action between the pieces 11 and 6, is not insulated. Therefore, the current flows from the pieces 11 into the piece 6 only in the neighborhood of the rivet 14.
  • the piece 6 is provided with a certain number of slits 15 and 16 intended to force the current to flow along its right side. It will be appreciated that the current path thus obtained, as shown by the dotted lines, has the shape shown in FIGURES 3 and 4.
  • the movable contact may be constituted by two U- shaped pieces 17 placed face-to-face and assembled by rivets. At their upper end, these pieces cover a lever 18 preferably made of light metal and fixed at its lower end on an axis 21. In order to oblige the current to flow along the desired path, an insulating cap 19 is provided between the end of the lever 18 and the U-shaped piece 17 whose lower extremity has the form of a fork and is riveted onto the lever 18 as by means of the rivet 20.
  • the movable lever 18 can be displaced by a device actuated by the control mechanism (not shown) of the circuit-breaker; for instance, by two interrupting levers 23.
  • the levers 23 When the points P and p come into contact, the levers 23 continue their movement towards the left and tension the spring 22 which secures the contact pressure. Continuing their movement towards the left of the figure, the levers 23 may, towards the end of their travel, come into contact with the main contact pieces 24 through which most of the current will then flow.
  • these contacts (23 and 24) part without forming an are because, at the moment of separation, all the current is directed to the points P and p between which the arc is initiated upon the separation of contacts 1 and 17.
  • This arrangement allows the gases which are produced at the separation of the points P and p, and which may have an explosive force, to be evacuated into the slits 25 without exerting on the arc root-s any action impeding the centering of the same.
  • the contact pressure can be secured, as shown in FIGURE 7, by a spring 22 exerting a force on the movable contact 17.
  • the contact pressure may, however, be obtained by a spring exerting a force on the fixed contact.
  • FIGURES 9 and 10 An arrangement of this kind is shown in FIGURES 9 and 10.
  • the movable contact is shown at 26 as a fiat bar of rectangular section.
  • the slits 27, 28 and 29 oblige the current to flow in the left side of the contact bar 26.
  • the fixed contact is formed by two flat pieces 30 (FIGURE 10) fixed on the axis 31, borne by a piece 32 formed by two bracket pieces, as shown in FIGURE 10.
  • a spring 33 secures, through the intermediary of a rod 34 and a fork 35, the contact pressure between the pieces 30 and the movable contact 26.
  • the travel of the contact pieces is limited by the stops 36 and 37.
  • a saw-cut 38 obliges the current to flow into the extreme right region of the piece 32. Under these conditions, the current is obliged to follow approximately the path as shown in dashed lines, this path corresponding closely to the current path as shown in FIG- URES 3 and 4.
  • the latter may advantageously be filled with a suitable insulating material.
  • this kind of contact may advantageously replace, in FIGURES 7 and 8, the contacts 23 and 24 which would not only obtain a compensation of the forces at the contact points themselves, but also completely protect the control mechanism of the circuit-breaker against the electrodynamic forces developed in the pivoting levers 23 and 18.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)
US860186A 1958-12-23 1959-12-17 Electrodynamic force-compensation pressure contacts for circuit breakers Expired - Lifetime US3092699A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR4068A FR1225685A (fr) 1958-12-23 1958-12-23 Perfectionnements aux contacts à pression compensés électrodynamiquement

Publications (1)

Publication Number Publication Date
US3092699A true US3092699A (en) 1963-06-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US860186A Expired - Lifetime US3092699A (en) 1958-12-23 1959-12-17 Electrodynamic force-compensation pressure contacts for circuit breakers

Country Status (6)

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US (1) US3092699A (fr)
BE (1) BE584795A (fr)
CH (1) CH357788A (fr)
DE (1) DE1143567B (fr)
FR (1) FR1225685A (fr)
GB (1) GB887860A (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359485A (en) * 1963-09-27 1967-12-19 Bbc Brown Boveri & Cie Tap changing device for transformer windings without interrupting the load current
US3593227A (en) * 1968-02-28 1971-07-13 Gennady Fedosievich Mitskevich Automatic electrodynamic blowoff breaker with stationary contact form of two series wound u-shaped members
US3663905A (en) * 1971-05-20 1972-05-16 Ite Imperial Corp Contact bridge system for circuit breaker
US4078218A (en) * 1976-02-12 1978-03-07 Westinghouse Electric Corporation Magnetic contactor
US4158829A (en) * 1977-09-01 1979-06-19 Cutler-Hammer, Inc. Electromagnetically operated DC power contactor
US4206333A (en) * 1978-08-17 1980-06-03 Eaton Corporation Double pole sliding contact trigger switch with sequential auxiliary butt contacts
US4240053A (en) * 1976-12-30 1980-12-16 Westinghouse Electric Corp. Circuit breaker utilizing improved current carrying conductor system
US4255636A (en) * 1976-12-30 1981-03-10 Westinghouse Electric Corp. Circuit breaker with current carrying conductor system utilizing eddy current repulsion
US4511774A (en) * 1983-12-08 1985-04-16 Eaton Corporation Current limiting contact arrangement
US4513267A (en) * 1983-03-28 1985-04-23 Siemens-Allis, Inc. Stationary contact strap to achieve a current limiting blow-off effect
US4804933A (en) * 1988-04-01 1989-02-14 Brown Industrial Gas, Inc. Automatic transfer switch
US4849590A (en) * 1988-04-01 1989-07-18 Kohler Company Electric switch with counteracting electro-electro-dynamic forces
US4991050A (en) * 1989-09-18 1991-02-05 Allen-Bradley Company, Inc. Method and device for protecting starters from fault currents
US5072203A (en) * 1989-09-18 1991-12-10 Allen-Bradley Company, Inc. Method and device for protecting starters from fault currents
EP2458613A1 (fr) * 2010-11-29 2012-05-30 Eaton Industries GmbH Appareil de contact d'un commutateur électrique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431581A1 (de) * 1984-08-28 1986-03-20 Friedrich Dipl.-Ing. 8033 Krailling Lauerer Elektrischer Schalter
DE3901823A1 (de) * 1989-01-21 1989-11-30 Gerhard Dr Peche Vakuumschaltroehre

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE534048A (fr) * 1953-12-11
US1754349A (en) * 1922-11-07 1930-04-15 Bbc Brown Boveri & Cie Electric switch
DE560368C (de) * 1928-09-21 1932-10-01 Const Electr De Delle Sa Atel Schalter in Schleifenform mit zwei Paaren von Hauptkontakten und nebengeschalteten Funkenziehkontakten
US2732468A (en) * 1956-01-24 Electric switch
US2821594A (en) * 1954-02-04 1958-01-28 Merlin Gerin Electrodynamic compensation device for pressure contacts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732468A (en) * 1956-01-24 Electric switch
US1754349A (en) * 1922-11-07 1930-04-15 Bbc Brown Boveri & Cie Electric switch
DE560368C (de) * 1928-09-21 1932-10-01 Const Electr De Delle Sa Atel Schalter in Schleifenform mit zwei Paaren von Hauptkontakten und nebengeschalteten Funkenziehkontakten
BE534048A (fr) * 1953-12-11
US2821594A (en) * 1954-02-04 1958-01-28 Merlin Gerin Electrodynamic compensation device for pressure contacts

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359485A (en) * 1963-09-27 1967-12-19 Bbc Brown Boveri & Cie Tap changing device for transformer windings without interrupting the load current
US3593227A (en) * 1968-02-28 1971-07-13 Gennady Fedosievich Mitskevich Automatic electrodynamic blowoff breaker with stationary contact form of two series wound u-shaped members
US3663905A (en) * 1971-05-20 1972-05-16 Ite Imperial Corp Contact bridge system for circuit breaker
US4078218A (en) * 1976-02-12 1978-03-07 Westinghouse Electric Corporation Magnetic contactor
US4240053A (en) * 1976-12-30 1980-12-16 Westinghouse Electric Corp. Circuit breaker utilizing improved current carrying conductor system
US4255636A (en) * 1976-12-30 1981-03-10 Westinghouse Electric Corp. Circuit breaker with current carrying conductor system utilizing eddy current repulsion
US4158829A (en) * 1977-09-01 1979-06-19 Cutler-Hammer, Inc. Electromagnetically operated DC power contactor
US4206333A (en) * 1978-08-17 1980-06-03 Eaton Corporation Double pole sliding contact trigger switch with sequential auxiliary butt contacts
US4513267A (en) * 1983-03-28 1985-04-23 Siemens-Allis, Inc. Stationary contact strap to achieve a current limiting blow-off effect
US4511774A (en) * 1983-12-08 1985-04-16 Eaton Corporation Current limiting contact arrangement
US4804933A (en) * 1988-04-01 1989-02-14 Brown Industrial Gas, Inc. Automatic transfer switch
US4849590A (en) * 1988-04-01 1989-07-18 Kohler Company Electric switch with counteracting electro-electro-dynamic forces
US4991050A (en) * 1989-09-18 1991-02-05 Allen-Bradley Company, Inc. Method and device for protecting starters from fault currents
US5072203A (en) * 1989-09-18 1991-12-10 Allen-Bradley Company, Inc. Method and device for protecting starters from fault currents
EP2458613A1 (fr) * 2010-11-29 2012-05-30 Eaton Industries GmbH Appareil de contact d'un commutateur électrique
WO2012072599A1 (fr) 2010-11-29 2012-06-07 Eaton Industries Gmbh Appareil de contact d'un dispositif de commutation électrique
CN103229268A (zh) * 2010-11-29 2013-07-31 伊顿电气Ip两合公司 电开关装置的接触机构
CN103229268B (zh) * 2010-11-29 2015-11-25 伊顿电气Ip两合公司 电开关装置的接触机构
US9269505B2 (en) 2010-11-29 2016-02-23 Eaton Electrical Ip Gmbh & Co. Kg Contact mechanism of an electric switching device

Also Published As

Publication number Publication date
CH357788A (fr) 1961-10-31
FR1225685A (fr) 1960-07-04
BE584795A (fr) 1960-03-16
GB887860A (en) 1962-01-24
DE1143567B (de) 1963-02-14

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