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WO2002035571A1 - Disjoncteur a boitier moule et contact auxiliaire - Google Patents

Disjoncteur a boitier moule et contact auxiliaire Download PDF

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Publication number
WO2002035571A1
WO2002035571A1 PCT/US2001/026395 US0126395W WO0235571A1 WO 2002035571 A1 WO2002035571 A1 WO 2002035571A1 US 0126395 W US0126395 W US 0126395W WO 0235571 A1 WO0235571 A1 WO 0235571A1
Authority
WO
WIPO (PCT)
Prior art keywords
auxiliary
circuit breaker
contact arm
contacting
movable
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.)
Ceased
Application number
PCT/US2001/026395
Other languages
English (en)
Inventor
David A. Leone
Bernard Dimarco
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.)
Siemens Energy and Automation Inc
Original Assignee
Siemens Energy and Automation Inc
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 Siemens Energy and Automation Inc filed Critical Siemens Energy and Automation Inc
Publication of WO2002035571A1 publication Critical patent/WO2002035571A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/107—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by the blow-off force generating means, e.g. current loops
    • H01H77/108—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by the blow-off force generating means, e.g. current loops comprising magnetisable elements, e.g. flux concentrator, linear slot motor

Definitions

  • the present invention relates generally to the field of circuit breakers, and more particularly to an auxiliary contact apparatus for a molded case circuit breaker.
  • a circuit breaker In general the function of a circuit breaker is to electrically engage and disengage a selected circuit from an electrical power supply. This function occurs by engaging and disengaging a pair of operating contacts for each phase of the circuit breaker.
  • the circuit breaker provides protection against persistent overcurrent conditions and against the very high currents produced by short circuits.
  • one of each pair of the operating contacts are supported by a pivoting contact arm while the other operating contact is substantially stationary.
  • the contact arm is pivoted by an- operating mechanism such that the movable contact supported by the contact arm can be engaged and disengaged from the stationary contact.
  • a typical industrial circuit breaker will have a continuous current rating ranging from as low as 15 amps to as high as several thousand amps.
  • the tripping mechanism for the breaker usually consists of a thermal overload release and a magnetic short circuit release.
  • the thermal overload release operates by means of a bimetallic element, in which current flowing through the conducting path of a circuit breaker generates heat in the bi-metal element, which causes the bi-metal to deflect and trip the breaker.
  • the heat generated in the bi-metal is a function of the amount of current flowing through the bi-metal as well as the period of time that that current is flowing.
  • the bi-metal cross- section and related elements are specifically selected for such current range resulting in a number of different current ranges for each circuit breaker. Electronic trip units are also used in some applications.
  • an electromagnetic trip element is generally used.
  • the higher amount of current flowing through. the circuit breaker activates a magnetic release which trips the breaker in a much faster time than occurs with the bi-metal heating. It is desirable to tune the magnetic trip elements so that the magnetic trip unit trips at lower short circuit currents at a lower continuous current rating and trips at a higher short circuit current at a higher continuous current rating. This matches the current tripping performance of the breaker with the typical equipment present downstream of the breaker on the load side of the circuit breaker. Again, electronic trip units can also be used.
  • Such arrangement typically include an electromechanically operable means for opening the extra pair of contacts, a field magnet associated with the pair of additional contacts and in some instances, a resistor connected and parallel with the additional contact for purposes of shunting some of the short circuit current.
  • Such arrangements typically require a larger circuit breaker housing to accommodate the additional contacts as well as their associated magnets, coils and resisters. Further such prior arrangements are more expensive and complex in relation to the benefit sought .
  • a molded case circuit breaker having auxiliary contacts mounted in series with the main contacts of the circuit breaker that do not require an additional coil or magnet to operate efficiently.
  • a molded case circuit breaker with an auxiliary contact apparatus that will fit in an existing molded case circuit breaker housing and requiring minimal modification to such housing.
  • a molded case circuit breaker the interrupting ratings of which can be increased while reducing the let-through energy in an inexpensive and simple manner.
  • the present invention provides a circuit breaker with a line terminal and load terminal, having an operating mechanism with a main, movable contact arm coupled to a load terminal and an auxiliary contact apparatus coupled in series with the main movable contact arm.
  • the auxiliary contact apparatus comprises an auxiliary stationary contact mounted on the load terminal, an auxiliary movable contact arm mounted for rotation in the circuit breaker and coupled to the main movable contact arm, an attraction plate mounted in the circuit breaker and aligned with the auxiliary movable contact arm wherein a magnetic flux induced in the metal plate attracts the auxiliary movable contact arm.
  • the auxiliary contact apparatus can also be provided with a biasing member mounted in the circuit breaker and coupled to the auxiliary movable contact arm, wherein, the auxiliary movable contact arm is urged into a closed position with the auxiliary stationary contact.
  • the auxiliary contact apparatus can also be provided with an arc chute structure mounted in the circuit breaker and aligned with the auxiliary movable contact arm, wherein the auxiliary movable contact arm moves through a channel defined in the arc chute structure .
  • the present invention further provides an auxiliary contact apparatus for a circuit breaker, with the circuit breaker having a primary contact apparatus and a load terminal.
  • the auxiliary contact apparatus comprises an auxiliary stationary contact mounted on the load terminal and an auxiliary movable contact arm mounted for rotation in the circuit breaker and coupled to the primary contact apparatus.
  • An attraction plate is mounted in the circuit breaker and aligned with the auxiliary movable contact arm wherein a magnetic flux induced in the attraction plate attracts the auxiliary movable contact arm.
  • the auxiliary contact apparatuses can also be provided with a bias member mounted in the circuit breaker and coupled to the auxiliary movable contact arm wherein the auxiliary movable contact arm is urged into a closed position with the auxiliary stationary contact.
  • the auxiliary contact apparatus can also include an arc chute structure mounted in the circuit breaker and aligned with the auxiliary movable contact arm, wherein the auxiliary movable contact arm moves through a channel defined in the arc chute structure.
  • the auxiliary contact apparatus is connected in series with the primary contact apparatus of the circuit breaker.
  • the present invention also provides a circuit breaker with a primary contact apparatus and a load terminal and having an auxiliary contact apparatus coupled in series with the primary contact apparatus.
  • the auxiliary contact apparatus comprises a first auxiliary means for contacting the load terminal and a second auxiliary means for contacting the primary contact apparatus.
  • the first auxiliary means for contacting is stationary and the second auxiliary means for contacting is movable.
  • the first auxiliary means for contacting is movable and the second auxiliary means for contacting is stationary.
  • the first auxiliary means for contacting and the second auxiliary means for contacting are each jointly mounted in one of a vertical aspect and a horizontal aspect with respect to the load terminal of the circuit breaker.
  • Figure 1 is a side cut-away view of a molded case circuit breaker providing an exemplary embodiment of an auxiliary contact apparatus, with the auxiliary movable contact arm coupled to a main movable contact arm and mounted in a substantially horizontal aspect with respect to the load terminal of the circuit breaker.
  • Figure 2 illustrates the current path (by arrows) for the circuit breaker illustrated in Figure 1 with the main contacts and the auxiliary contacts in the "ON" (closed) position.
  • Figure 3 is a partial top exploded view of an auxiliary movable contact arm aligned in a channel defined in an arc chute structure and illustrating two arc plates included in the arc chute structure.
  • Figure 4 is a partial side cut-away view of a molded case circuit breaker providing an exemplary embodiment of an auxiliary contact apparatus, with the auxiliary movable contact arm coupled to a load terminal.
  • Figure 5 is a partial side cut-away view of a molded case circuit breaker providing an auxiliary contact apparatus mounted in a substantially vertical aspect with respect to the load terminal .
  • Figure 1 generally illustrates single phase molded case circuit breaker 10 that includes an operating mechanism 20 having a handle 21.
  • the operating mechanism 20 is mounted within a housing 18.
  • the handle 21 is movable between an "ON" position, an "OFF” position and a "TRIPPED" position.
  • the exemplary circuit breaker 10 is a single pole breaker however, it is contemplated that the several exemplary embodiments of the auxiliary contact apparatus 40 may be practiced in a three-phase or in other multi-phase circuit breakers. In such multi-phase breaker, each pole would be connected, in series, to a separate auxiliary contact apparatus 40.
  • the molded case circuit breaker 10 has a line terminal 12 and a load terminal 14 to which electrical wires or cables are attached when the circuit breaker 10 is installed in a selected circuit.
  • the housing 18 encloses the components of the circuit breaker including an operating mechanism 20 to which a main movable contact arm 30 and a trip assembly 28 are coupled.
  • An auxiliary contact apparatus 40 is mounted within a suitable void in the housing 18 of the circuit breaker 10 and is coupled in series with the main movable contact arm 30. It is contemplated that an existing molded case circuit breaker will be minimally modified to accommodate the auxiliary contact apparatus 40. However, it is also contemplated that a new molded case circuit breaker design case initially incorporate the auxiliary contact apparatus 40.
  • the auxiliary contact apparatus 40 comprises an auxiliary stationary contact 42 mounted on a load terminal 14, an auxiliary movable contact arm 44 mounted for rotation in the circuit breaker 10 and coupled to the main movable contact arm 30 and an attraction plate 54 mounted in the circuit breaker 10.
  • the attraction plate 54 is aligned with the auxiliary movable contact arm 44, wherein a magnetic flux is induced and the attraction plate attracts the auxiliary movable contact arm 44, as will be explained below.
  • An auxiliary stationary contact pad 43 is mounted on the auxiliary stationary contact 42 with any suitable and satisfactory attachment method such as welding, riveting or brazing.
  • the auxiliary movable contact arm 44 has an auxiliary movable contact arm contact pad 45 mounted in a similar fashion.
  • the auxiliary movable contact arm 44 is mounted for rotation in the circuit breaker 10 at a pivot 46 and held in place by a pivot clip 48.
  • the pivot clip can be any suitable material such as metal or an engineered plastic with the preferred embodiment providing a nickel plated steel formed to engage and retain the auxiliary movable contact arm 44 within the housing 18 of the circuit breaker 10.
  • One end of an auxiliary braid 52 is attached to one end of the auxiliary movable contact arm 44 with another end of the auxiliary braid 52 attached to the load bus 23.
  • a bi-metal/magnetic trip assembly 66 is mounted in the housing 18 of the circuit breaker 10 and couples the load bus 23 to the main movable contact arm 30 via a main braid 26.
  • the bi-metal assembly includes the bi-metal element 70 fixed at one end to the load bus 23 at a joint 73 formed by the load bus 23 and the bi-metal 70.
  • the joint 73 is created by suitable weld or braze.
  • a magnetic armature 68 and a magnetic yoke 72 form a part of the bi-metal assembly 66.
  • the response characteristics of the bimetal/magnetic trip assembly 66 is controlled by a calibrating screw 74 mounted in the load bus 23 and by the physical attributes of the trip assembly.
  • the main movable contact arm 30 and main stationary contact 32 are closed.
  • the auxiliary stationary contact 42 and auxiliary movable contact arm 44 of the auxiliary contact apparatus 40 are also closed, as shown in Figure 2.
  • the current flows through the line terminal 12 into the line bus 22 and through the main stationary contact 32 into the main movable contact arm 30 of the primary contact apparatus 29.
  • the current then flows through the main braid 26 into the bi-metal/magnetic trip assembly 66 and then through the load bus 23 and into the auxiliary contact apparatus 40.
  • From the load bus 23 current flows through the auxiliary braid 52 into the auxiliary movable contact arm 44 and into the auxiliary movable contact arm contact pad 45 to the auxiliary stationary contact pad 43.
  • the current then flows through the auxiliary stationary contact 42 through the load terminal 14 and onto the load (not shown) .
  • the circuit breaker 10 having the auxiliary contact apparatus 40 will experience high current flowing through the circuit described above. Such high current will cause the magnetic yoke 72 and the magnetic armature 68 in the bimetal/magnetic trip assembly 66 to activate the trip assembly 28 of the circuit breaker 10. However, prior to the response of the magnetic armature, the auxiliary contact apparatus 40 will respond to the high current flowing through the auxiliary contact pads 43, 45 with a force that varies in relation to the square of the current flowing through such contact pads .
  • the current flowing through the auxiliary movable contact arm 44 also induces a magnetic flux in the movable contact arm 44 and an attraction plate 54 mounted in the circuit breaker 10.
  • the magnetic flux induced in the auxiliary movable contact arm 44 and the attraction plate 54 assists in keeping the auxiliary movable contact arm 44 in an opened position during the current interruption operation of the circuit breaker 10.
  • only one attraction plate 54 is illustrated, multiple plates can be used in each pole of the circuit breaker 10, as selected during the manufacture of the circuit breaker.
  • the electrical arc typically created during the opening of the auxiliary contact apparatus 40 under short circuit conditions, is drawn into an arc chute structure 56 which extends and cools the arc to assist in the current interruption operation of the circuit breaker.
  • the main movable contact on arm 30 and the main stationary contact 32 are blown apart by the magnetic force generated under the short circuit condition.
  • the operating mechanism 20, trip assembly 28 and the bi-metal assembly 66 of the circuit breaker 10 also operates to hold the main movable contact arm 30 in its TRIPPED and OPENED position. With the circuit opened, the main movable contact arm 30 remains in an open position until the handle 21 of the circuit breaker 10 is reset and placed in the on position. This can be done manually by an operator or can be done by a motor coupled to the circuit breaker or by a stored energy device coupled to the circuit breaker. With the circuit open and no current flowing through the circuit breaker, the auxiliary movable contact arm 44 is urged back to the closed position by the bias member 50. With no current flowing through the circuit breaker, there is no magnetic flux induced in the movable contact arm 44 or the attraction plate 54 as described above .
  • the auxiliary movable contact arm 44 is mounted for rotation in the housing 18 of the circuit breaker 10 as can be seen in Figures 1 and 3.
  • the bias member 50 is also mounted in the circuit breaker and coupled to the auxiliary movable contact arm 44.
  • the bias member 50 urges the auxiliary movable contact arm 44 into a closed position with the auxiliary stationary contact 42.
  • the bias member 50 pushes against the auxiliary movable contact arm 44 from underneath the arm as shown in Figures 1 and 3.
  • the bias member 50 pushes against the auxiliary movable contact arm 44 from above as shown in Figure 4.
  • Figure 5 shows another embodiment of the auxiliary contact apparatus 40 aligned in a vertical aspect with respect to the load terminal 14.
  • the bias member 50 pushes the auxiliary movable contact arm 44 from behind the arm into a closed position with the auxiliary stationary contact 42. In all embodiments, the bias member 50 biases the auxiliary movable contact arm 44 to a closed position.
  • the electromagnetic forces generated in the auxiliary contact apparatus 40 in a short circuit condition overcomes the bias force exerted by the bias member 50 to open the contacts 43, 45 of the auxiliary contact apparatus 40.
  • the bias member 50 can be a compression spring, a clip spring or a torsion spring.
  • the preferred embodiment provides a steel torsion spring as illustrated in the figures.
  • an auxiliary contact apparatus 40 includes an arc chute structure 56.
  • Two arch chute side panels 62 having a plurality of slots 63 support a plurality of arc plates 60 (See Figs. 1, 3 and 5) .
  • the arc plates as best seen in Fig. 3, are generally U- shaped and are stacked between the two side plates 60.
  • the arc plates 60 can be provided with tabs 61 which engage the slots 63 to form the arc chute structure 56.
  • an arc channel 58 is formed between the two legs of each arc plate 60.
  • the auxiliary movable contact arm 44 moves through the channel 58 of the arc chute structure 56 as the auxiliary movable contact arm 44 moves from one position to another position.
  • an electrical arc is drawn between the contact pads 43, 45 of the auxiliary contact apparatus 40.
  • Such electric arc extends into the arc chute structure 56 which lengthens and cools the arc as the arc voltage increases until the current ceases to flow in the circuit .
  • An arc runner 64 can also be provided on the auxiliary movable contact arm 44 to facilitate the extension, into the arc channel 58, of the arc generated during a short circuit condition.
  • the arc runner 64 can be integrally formed with the auxiliary movable contact arm 44 during the manufacture of the auxiliary contact apparatus 40.
  • Figures 1, 2, 4 show the auxiliary contact apparatus 40 in a substantially horizontal aspect 47 with respect to the load terminal 14.
  • Figure 5 illustrates the auxiliary contact apparatus 40 in a substantially vertical aspect 41 with respect to the load terminal 14.
  • Other embodiments of the auxiliary contact apparatus 40 provide for the auxiliary movable contact arm 44 to pivot while attached to one of the load terminal 14 (See Figs. 4 and 5) or the load bus 23 (See Fig. 1) coupled to the main movable contact arm 30 of the circuit breaker 10.
  • a circuit breaker with a line terminal and a load terminal having an operating mechanism with a main movable contact arm coupled to a load terminal and an auxiliary contact apparatus coupled in series with the main movable contact arm.
  • the trip mechanism can be an electronic trip mechanism or that the load terminal and auxiliary contact apparatus be housed in a separate housing capable of mechanically and electrically connecting to another housing containing the operating mechanism and line terminal thereby providing for a quick and easy change of current rating for an application of the circuit breaker contemplated herein.
  • the auxiliary contact apparatus 40 can be included in a circuit breaker having a main movable contact arm and a main movable line contact. It is also contemplated that the auxiliary contact apparatus 40 can be provided in a multi -phase molded case circuit breaker wherein a separate auxiliary contact apparatus 40 is provided in series with each pole of the multi-pole circuit breaker. Additional modifications will be evident to those with ordinary skill in the art.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Abstract

L'invention concerne un disjoncteur, pourvu d'une borne de ligne (12) et d'une borne de sortie (14), comprenant un mécanisme de commande équipé d'un bras (30) de contact mobile principal relié à une borne de charge et d'un appareil (40) de contact auxiliaire relié en série au bras de contact mobile principal. Cet appareil (40) de contact auxiliaire comprend un contact (42) stationnaire auxiliaire monté sur la borne de sortie, un bras (44) de contact mobile auxiliaire monté rotatif dans le disjoncteur et relié au bras de contact mobile principal, une plaque (54) d'attraction montée dans le disjoncteur et alignée avec le bras de contact mobile auxiliaire, lequel bras (44) est attiré par un flux magnétique induit dans la plaque de métal.
PCT/US2001/026395 2000-10-24 2001-08-23 Disjoncteur a boitier moule et contact auxiliaire Ceased WO2002035571A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69560300A 2000-10-24 2000-10-24
US09/695,603 2000-10-24

Publications (1)

Publication Number Publication Date
WO2002035571A1 true WO2002035571A1 (fr) 2002-05-02

Family

ID=24793693

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/026395 Ceased WO2002035571A1 (fr) 2000-10-24 2001-08-23 Disjoncteur a boitier moule et contact auxiliaire

Country Status (1)

Country Link
WO (1) WO2002035571A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815059A (en) * 1972-12-01 1974-06-04 Westinghouse Electric Corp Circuit interrupter comprising electromagnetic opening means
EP0102867A1 (fr) * 1982-08-06 1984-03-14 Telemecanique Dispositifs modulaires de limitation de courant
DE3744586A1 (de) * 1987-04-03 1988-10-13 Oppach Schaltelektronik Kontakteinrichtung zum ansetzen an selbstschalter zum zwecke der strombegrenzung
EP0418755A2 (fr) * 1989-09-18 1991-03-27 Mitsubishi Denki Kabushiki Kaisha Disjoncteur limiteur de courant
WO1995019634A2 (fr) * 1994-01-13 1995-07-20 Square D Company Disjoncteur a double mecanisme de rupture

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815059A (en) * 1972-12-01 1974-06-04 Westinghouse Electric Corp Circuit interrupter comprising electromagnetic opening means
EP0102867A1 (fr) * 1982-08-06 1984-03-14 Telemecanique Dispositifs modulaires de limitation de courant
DE3744586A1 (de) * 1987-04-03 1988-10-13 Oppach Schaltelektronik Kontakteinrichtung zum ansetzen an selbstschalter zum zwecke der strombegrenzung
EP0418755A2 (fr) * 1989-09-18 1991-03-27 Mitsubishi Denki Kabushiki Kaisha Disjoncteur limiteur de courant
WO1995019634A2 (fr) * 1994-01-13 1995-07-20 Square D Company Disjoncteur a double mecanisme de rupture

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DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase