EP0125391B1 - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
EP0125391B1
EP0125391B1 EP19840101296 EP84101296A EP0125391B1 EP 0125391 B1 EP0125391 B1 EP 0125391B1 EP 19840101296 EP19840101296 EP 19840101296 EP 84101296 A EP84101296 A EP 84101296A EP 0125391 B1 EP0125391 B1 EP 0125391B1
Authority
EP
European Patent Office
Prior art keywords
tripping
reset lever
reset
circuit breaker
hook
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
Application number
EP19840101296
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0125391A2 (en
EP0125391A3 (en
Inventor
Shigeo Moriya
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0125391A2 publication Critical patent/EP0125391A2/en
Publication of EP0125391A3 publication Critical patent/EP0125391A3/en
Application granted granted Critical
Publication of EP0125391B1 publication Critical patent/EP0125391B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1072—Release mechanisms which are reset by opening movement of contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism
    • H01H2071/508—Latching devices between operating and release mechanism with serial latches, e.g. primary latch latched by secondary latch for requiring a smaller trip force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/128—Manual release or trip mechanisms, e.g. for test purposes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/32—Electromagnetic mechanisms having permanently magnetised part
    • H01H71/321—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements
    • H01H71/322—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements with plunger type armature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism

Definitions

  • the present invention relates to a circuit breaker of the kind referred to in the precharacterizing part of claim 1.
  • a circuit breaker is known from US-A-3 783 422.
  • an electronic circuit breaker is provided with a magnetic tripping device constituted by a permanent magnet, a plunger arranged to be attracted to the permanent magnet, a tripping coil adapted to be excited in the direction to cancel the magnetic flux of the permanent magnet when the coil is energized, and a release spring for urging the plunger in the tripping operation.
  • the magnetic tripping device is arranged such that the plunger is normally held in its reset position by the force due to the magnetic flux of the permanent magnet against the force of the releasing spring, while in the tripping operation, the magnetic flux of the permanent magnet is cancelled by the magnetic flux induced by a signal current flowing in tripping coil so that the plunger is moved to its tripping position by the force of the releasing spring.
  • the movement of the plunger is transmitted to a tripping member in the circuit breaker to thereby achieve the tripping operation.
  • a plunger of the magnetic tripping device is moved to its reset position through a resetting arm which is in contact with an end of the handle of the circuit breaker, when the handle is caused to come back to its reset position upon the completion of tripping operation of the tripping device.
  • the resetting is performed by converting a slight displacement of the handle of the magnetic tripping device from its off-position to its reset position, and, therefore, the escape of a resetting member can not be obtained from the stroke of the plunger upon completion of resetting, so that the resetting member may interfere with the plunger in the tripping operation. It is necessary, therefore, to drive not only a latch member for tripping but the resetting member in the tripping operation, resetting in a problem that the tripping operation is made to be heavy so as to cause maloperations.
  • the circuit breaker known from US-A-3,783,422 has a tripping mechanism wherein a magnetic tripping device with a plunger is installed and the movement of said plunger is transmitted to a tripping means which engages a hook by a tripping force transmitting means. This tripping force transmitting means is used for reset.
  • An object of the present invention is to provide a circuit breaker provided with a circuit breaker tripping mechanism having a long life and high reliability with less maloperation and an automatic resetting mechanism adapted to surely perform the resetting of the magnetic tripping mechanism immediately upon the completion of tripping operation thereof.
  • Fig. 1 is a longitudinal cross-section showing the entire arrangement of a circuit breaker according to a first embodiment of the present invention.
  • a primary and a secondary conductor 12a and 12b are provided in the proximity of the bottom of the casing.
  • the primary conductor 12a is provided with fixed contacts 22 and the secondary conductor 12b is passed through a current transformer 7 provided as a current detector means for each phase and fixedly attached to the casing 1 by screws 64.
  • a contact on/off mechanism 24 provided with a movable contact 21 is provided between the primary and secondary conductors 12a and 12b and the movable contact 21 is electrically connected to the secondary conductor 12b through a flexible conductor 67.
  • Terminals 12c and 12d are attached to the primary and secondary conductors 12a and 12b respectively by screws 64.
  • the contact on/off mechanism 24 is provided with a movable frame 70 rotatably supported by an axle 65 and urged clockwise in the drawing by a not-shown torsion spring and an insulator shaft 66 which connects the movable frames of the respective phases to interlink them to one another.
  • a lower member 83 of a toggle link is rotatably supported at its one end by an axle 68 on the movable frame 70 substantially at the center portion thereof and rotatably supported at its other end by axle 84 on an upper member 75 of the toggle link.
  • the upper member 75 of the toggle link is supported at its one end by an axle 72 on a hook 3 substantially at the center portion thereof.
  • a handle lever 81 is rotatably supported by an axle 71 fixedly attached to a fixed frame 76.
  • the handle lever 81 is provided at its upper portion with an engage portion 81 a which engages with a handle 2.
  • the engagement portion 81 a is provided with a pin 81b.
  • a spring 82 is provided between the pin 81 b and the axle 84 so as to perform the snap action of the toggle link in the on/ off operation.
  • the hook 3 for performing the tripping operation is formed into an inverted L-shape.
  • the hook 3 is rotatably supported at its one end by an axle 73 on the movable frame 70 at an upper portion thereof and urged counterclockwise in the drawing by a not-shown spring.
  • the hook 3 is formed at its other end with a tip end 3a which engages with a trip fitting 4.
  • the externally operated handle 2 is mounted on the engagement portion 81 a of the handle lever 81 and arranged to slidably engage with the actuator opening portion of the casing 1 from the inside thereof.
  • the movable contact 21 is divided into a main movable contact portion 78a for current conduction and an auxiliary movable contact portion 21a a for current cut-off which are fixedly attached to a main movable contact base 78 and an auxiliary movable contact base 21 respectively on the respective surfaces thereof opposed to the fixed contacts 22.
  • the main movable contact base 78 and the auxiliary movable contact base 21 are rotatably supported by an axle 69 on the movable frame 70 and urged by springs 80 and 79 respectively to obtain contact pressures between the movable and fixed contacts.
  • the movable contact is divided into the main and auxiliary movable contact portions because the embodiment relates to a circuit breaker of the type for cutting off a large current, it is not necessary to divide the movable contact in the case of a circuit breaker of the type for cutting off a small current.
  • the fixed frame 76 is fixedly attached to the bottom of the casing, and the axle 71 of the handle lever and a movable frame stopper 74 are fixedly attached to the fixed frame 76.
  • a reinforcing plate 70a is fixedly attached to the movable frame 70 at a portion thereof which is in contact with the stopper 74.
  • Arc chutes 23 are provided about the contact portion.
  • An insulator plate 77 is provided between the arc chutes 23 and the primary terminal 12c to prevent an arc from flying to the primary terminal 12c.
  • a current signal detected by the current transformer 7 is applied to a tripping circuit 8 constituted by an electronic circuit, converted into a tripping signal, and then applied to an actuator or magnetic tripping device 9.
  • the tripping circuit 8 may be that disclosed in Japanese Patent Publication No. 25696/Sho55 (1980) or may be a tripping circuit of any other known electronic circuit breaker.
  • a tripping mechanism 25 is constituted by the magnetic tripping device 9, the fitting 4 which serves as a tripping member, a pawl receiver 5 which serves as a transmission member, a lever 11 which serves as a linkage member, a reset lever 13, a tension spring 14 which serves as a reset lever holding member, and a compression spring 15 which serves as a reset lever urging member. Further, a tripping button 20 is provided for checking tripping or manually performing the tripping operation.
  • Figs. 2, 3 and 4 show the positional relations among the respective constituent components of the tripping device in its normal current conduction state, in its tripping state, and in its reset state, respectively.
  • Figs. 5A to 5D show the arrangement and operation of the pawl 6, the pawl receiver 5 and the tripping fitting 4.
  • a transmission portion 6b of the pawl 6 is at a standstill at the position as shown in the drawing due to the balanced state of force between the compression spring 85 and the tension spring 86.
  • the tripping fitting 4 and the pawl receiver 5 are urged counterclockwise in the drawing by a torsion spring 87 wound around an axle 32.
  • the pawl receiver 5 is prevented from rotating beyond the position as shown in the drawing by a stopper 88.
  • the tripping fitting 4 is prevented from rotating beyond the position as shown in the drawing by a stopper 89 provided on the pawl receiver 5.
  • the compression spring 85, the tension spring 86, the torsion spring 87, and the stoppers 88 and 89 are omitted in Figs. 5B to 5D.
  • Figs. 5B to 5D show the positional relation and operation of the pawl 6, the pawl receiver 5 and the tripping fitting 4, in the normal current conduction state, at the initiation of tripping operation, and at the initiation of resetting operation, respectively.
  • the pawl receiver 5 is provided with a stopper 34 for stopping a lower end portion 4d of the tripping fitting 4 and rotatably supported by an axle 31 such that it is engaged by a stopper 6a provided at the pawl 6 in the normal current conduction state and in the reset state.
  • the tripping fitting 4 is formed with an engagement portion 4a which engages with the tip end portion 3a of the hook 3, slot portions 4b and 4c, and the lower end portion 4d.
  • the slot portion 4b serves to prevent interference when the tip end portion 3a of the hook 3 is engaged with the engagement portion 4a in the normally current conduction state and in the resetting operation.
  • the slot portion 4c is formed substantial into a U-shape and the axle 32 is loosely passed through the slot portion 4c.
  • the lower end portion 4d is slidably in contact with the stopper 34 so as to facilitate the disengagement of the hook 3 in the tripping operation and the reengagement of the hook 3 in the resetting operation.
  • the pawl 6 is rotatably supported by an axle 30 and provided with the abovementioned stopper portion 6a and the transmission portion 6b provided perpendicularly to the stopper portion 6a for transmitting the movement of a pin 10a of the magnetic tripping device 9.
  • the pawl 6 is provided with another transmission portion 6c extending in the direction substantially perpendicular to the firstmentioned transmission portion 6b and in the direction in opposite to or different substantially by 180° from the stopper portion 6a, for transmitting the movement of the tripping button 20 (Fig. 2).
  • the lever 11 is formed substantially into an L-shape and rotatably supported substantially at its center portion by an axle 32.
  • the lever 11 is provided at its upper end portion with an abutment portion 11 a which engages with the hook 3 and provided at its lower end portion with a hole 11b to which a tension spring 14 is attached.
  • the reset lever 13 is rotatably supported by an axle 33 in this embodiment as shown in the best way in Fig. 2, and provided with a hole 13a to which a tension spring 14 is attached, an opening or loose-fit portion 13b through which the pin 10a is loosely passed and another opening of loose-fit portion 13c through which a guide 63 is loosely passed as shown in the best way in Fig. 14A.
  • the guide 63 is disposed in parallel with the pin 10a of the magnetic tripping device 9 and has one end provided with a stopper 61 and the other end attached to a plate 62.
  • the guide 63 is provided with a compression spring 15 which serves as a reset lever urging means for urging the reset lever 13 toward the magnetic tripping device 9.
  • the lever 11 and the reset lever 13 are coupled with each other by the tension spring 14 so that the movement of the lever 11 is transmitted to the reset lever 13 through the tension spring 14.
  • a plunger 10 of the magnetic tripping device 9 is provided with the pin 10a at its tip end.
  • An abutment plate 40 provided on the pin 10a as an engagement portion engages with the loose-fit portion 13b of the reset lever 13 to thereby drive the pin 10a in the resetting direction.
  • Figs. 7A and 7B show the internal arrangement of the magnetic tripping device 9, the former showing the reset state and the latter showing the state in tripping operation.
  • a casing is constituted by a frame 41 of a magnetic material and a yoke 42.
  • a coil 45 and a permanent magnet 43 are provided in the casing and the plunger 10 of a magnetic material is inserted into the central portion of a bobbin 46 of the coil 45.
  • the movement of the plunger 10 is transmitted outside through a guide 44.
  • a compression spring 47 is provided between a flange portion 49 of the plunger 10 and the bobbin 46 so as to urge the plunger 10 outerward or left in the drawing.
  • the coil 45 produces magnetic flux in the direction in opposite to that of the permanent magnet 43 so as to cancel the attraction force between the plunger 10 and the frame 41.
  • the plunger 10 is urged by the compression spring to move left in the drawing until it reaches the position at which it is in contact with the guide 44, as seen in Fig. 7B.
  • Figs. 5B to 5D, Fig. 6A to 6E, and Figs. 7A and 7B the steps of tripping operation according to this embodiment will be now described.
  • the manual tripping button 20 and the transmission portion 6c are omitted in Figs. 5B to 5D and Figs. 6A to 6E.
  • the lower end portion 4d of the tripping fitting 4 is supported by the stopper 34 provided on the pawl receiver 5 and the upper portion of the pawl receiver 5 is engaged with the stopper 6a, so that the tripping fitting 4 maintains the engagement with the hook 3.
  • a tripping current is supplied to the magnetic tripping device 9 from the tripping circuit 8, so that the plunger 10 is urged by the spring 47 to move toward the yoke 42, as shown in Fig. 7B.
  • the pin 10a provided at the tip end of the plunger 10 is urged in the direction- of arrow A as shown in Fig. 6 to be in contact with the transmission portion 66.
  • the pawl 6 is rotated in the direction of arrow B to thereby release the engagement between the stopper 6a and the pawl receiver 5.
  • the hook 3 is urged in the direction of arrow D by a spring (not shown) for urging the tripping mechanism 24 so that the hook 3 pushes up the tripping fitting 4, as shown in Fig. 5C, against the urging force of the spring 87 to cause the tripping fitting 4 to rotate in the direction of arrow C, whereby the hook 3 releases the engagement with the tripping fitting 4 to trip the tripping mechanism 24.
  • the tripping fitting 4 and the pawl receiver 5 are caused to come back to their initial positions by being urged by the spring 87.
  • the pushing force by the hook 3 is not acted on the abutment portion 11a a of the lever 11 so that the lever 11 is enabled to rotate in the direction of F as shown in Fig. 6D and the reset lever 13 is urged in the direction E by the recovery force of the compression spring 15 to move, while pushing the abutment plate 40 by its loose-fit portion 13b, until the reset lever 13 reaches the position at which it is in contact with the stopper 61.
  • the plunger 10 is pushed back to its initial position in which it is attracted onto the frame 41 again by the force due to the magnetic flux of the permanent magnet 43, so that the magnetic tripping device 9 is made to reset.
  • the pawl 6 is returned to its initial position by the springs 85 and 86.
  • the breaker Under the condition, the breaker is in its tripped state and the handle 2 stays in its trip position as shown in Fig. 3.
  • the breaker may be reset from this state by moving the handle 2 to its reset position as shown in Fig. 4.
  • the hook 3 By this handle actuation, the hook 3 is urged in the direction of arrow H as shown in Fig. 5D and the tip end 3a of the hook 3 obliquely hits and pushes the engagement portion 4a of the tripping fitting 4.
  • the tripping fitting 4 slides in the direction of arrow G by the pushing force of the tip end 3a of the hook 3 because the axle 32 is loosely inserted through the U-shaped slot portion 4c of the tripping fitting 4.
  • the hook 3 moves in the direction of arrow H so as to be engaged again with the engagement portion 4a, so that the reset mechanism comes back into the state of Fig. 6A through the state of Fig. 6E.
  • the hook 3 pushes the abutment portion 11 a of the lever 11 and the movement of the lever 11 is transmitted to the reset lever 13 through the tension spring 14 to cause the reset lever 13 to move to the position beyond the stroke of the abutment plate 40 to return into its initial state.
  • the reset lever 13 is standing-by at the position beyond the stroke of the pin 10a without preventing the movement of the pin 10a during the tripping operation of the magnetic tripping device, so that a small driving force is sufficient to drive the pin 10a and the apparatus can be reduced in size as well as in weight. Further, although the lever 11 is pushed by the hook 3 in the normal state and in the reset state, the pushing is released in tripping and the rotation of the lever at this time is used to obtain a predetermined reset force to drive the reset mechanism. Further, there is an effect that the parts are hardly deformed and have long lifetime.
  • Fig. 8 shows a second embodiment of the present invention.
  • a return spring 15' is provided on the pin 10a to thereby eliminate the guide 63 of the first embodiment.
  • the stroke of the return spring 15' may be reduced to small value so that a margin is provided in the stress of the return spring 15'.
  • Fig. 9 shows a third embodiment of the present invention.
  • a tension spring 15" is provided as the reset lever urging member.
  • Fig. 10 shows a fourth embodiment of the present invention.
  • a torsion spring 50 is provided as the reset lever urging member.
  • a torsion spring 51 may be used with a reset plate 52 provided on the guide plate 62 as the reset lever, so that the position adjusting work can be simplified in assembling.
  • Fig. 12A shows a fifth embodiment of the present invention.
  • a reset lever 53 is arranged to move horizontally, so that the movement of the reset lever 53 can be minimized and the apparatus is reduced in size to be accommodated within a narrow space.
  • one of the guides 63 can be eliminated as shown in Fig. 12B. In the latter case, although the tension spring 14 is exerted with a bending force when it is passed through the guide plate 62, the spring 14 is not deformed because it has elasticity.
  • Fig. 13A shows a sixth embodiment of the present invention.
  • a reset plate 54 made of an elastic material is provided as the reset lever.
  • the arrangement of the reset plate is not limited to that shown in Fig. 13A but it may be arranged as a reset plate 54' as shown in Fig. 138. According to the sixth embodiment, the arrangement is simplified so that steps of assembling are reduced to thereby reduce the apparatus in size as well as in weight.
  • the elastic material may be a spring plate or a soft synthetic resin plate.
  • a reinforcement (not shown) may be provided at the attaching portion of the tension spring 14 when the situation requires.
  • Figs. 14B to 14F show various modifications of the loose-fit portion between the reset lever and the guide and the loose-fit portion between the reset lever and the pin.
  • the shape of the loose-fit portion between the reset lever and the guide is not limited to that shown in Fig. 14A but, as shown in Figs. 14B to 14D, the guide is formed into a channel-like guide 63' so that the upper end of the reset lever 13 may be used as it is as the loose-fit portion 13c' with the guide 63' or the upper end portion of the reset lever 13 formed with notches may be used as the loose-fit portion 13c" with the guide 63'. Further, as shown in Figs.
  • the guide may be formed into a strip- like guide 63" with the upper end portion provided with a groove as the loose-fit portion 13c"-'. Further, as shown in Figs. 14E and 14F, the loose-fit portion between the reset lever and the pin 10a may be in the form of a slot 13b', so that the workability can be improved in assembling.
  • the lever 11 may be used also as an actuator lever for an alarm switch (not shown) provided in the apparatus.

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  • Breakers (AREA)
EP19840101296 1983-04-13 1984-02-08 Circuit breaker Expired EP0125391B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63589/83 1983-04-13
JP6358983A JPS59189529A (ja) 1983-04-13 1983-04-13 配線用遮断器

Publications (3)

Publication Number Publication Date
EP0125391A2 EP0125391A2 (en) 1984-11-21
EP0125391A3 EP0125391A3 (en) 1985-07-10
EP0125391B1 true EP0125391B1 (en) 1988-05-18

Family

ID=13233603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840101296 Expired EP0125391B1 (en) 1983-04-13 1984-02-08 Circuit breaker

Country Status (3)

Country Link
EP (1) EP0125391B1 (enrdf_load_stackoverflow)
JP (1) JPS59189529A (enrdf_load_stackoverflow)
DE (1) DE3471400D1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404771B (de) * 1990-02-19 1999-02-25 Felten & Guilleaume Ag Oester Schaltschloss für einen fehlerstromschutzschalter
DE102004005983A1 (de) * 2004-02-06 2005-09-08 Siemens Ag Installationsgerät mit optimierten Drehmomenten und entsprechendes Auslöseverfahren bei Vorliegen eines Fehlerstroms
FR3050313B1 (fr) * 2016-04-14 2021-02-19 Hager Electro Sas Appareil electrique de protection de ligne

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324428A (en) * 1965-07-27 1967-06-06 Ite Circuit Breaker Ltd Shockproof shunt trip unit for tripping open the contacts of a circuit breaker
US3530414A (en) * 1969-02-26 1970-09-22 Westinghouse Electric Corp Circuit breaker with improved trip means
US3783422A (en) * 1972-09-25 1974-01-01 Westinghouse Electric Corp Circuit breaker tripping device operable from a low energy tripping signal
JPS545505A (en) * 1977-06-16 1979-01-17 Chuo Denki Seisakushiyo Kk Method of fairing stator coil
JPS5824364Y2 (ja) * 1978-07-24 1983-05-25 株式会社日立製作所 配線用しゃ断器
JPS56166649U (enrdf_load_stackoverflow) * 1980-05-14 1981-12-10
JPS621733Y2 (enrdf_load_stackoverflow) * 1980-12-08 1987-01-16

Also Published As

Publication number Publication date
JPH0216528B2 (enrdf_load_stackoverflow) 1990-04-17
EP0125391A2 (en) 1984-11-21
DE3471400D1 (en) 1988-06-23
JPS59189529A (ja) 1984-10-27
EP0125391A3 (en) 1985-07-10

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