EP0028389A1 - Disjoncteur de protection à basse tension - Google Patents

Disjoncteur de protection à basse tension Download PDF

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Publication number
EP0028389A1
EP0028389A1 EP80106618A EP80106618A EP0028389A1 EP 0028389 A1 EP0028389 A1 EP 0028389A1 EP 80106618 A EP80106618 A EP 80106618A EP 80106618 A EP80106618 A EP 80106618A EP 0028389 A1 EP0028389 A1 EP 0028389A1
Authority
EP
European Patent Office
Prior art keywords
contact piece
current
memory alloy
separation point
switch according
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.)
Granted
Application number
EP80106618A
Other languages
German (de)
English (en)
Other versions
EP0028389B1 (fr
Inventor
Lutz Dr. Niemeyer
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.)
BBC Brown Boveri AG Germany
Original Assignee
BBC Brown Boveri AG Germany
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 BBC Brown Boveri AG Germany filed Critical BBC Brown Boveri AG Germany
Priority to AT80106618T priority Critical patent/ATE5448T1/de
Publication of EP0028389A1 publication Critical patent/EP0028389A1/fr
Application granted granted Critical
Publication of EP0028389B1 publication Critical patent/EP0028389B1/fr
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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/122—Automatic release mechanisms with or without manual release actuated by blowing of a fuse
    • 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/145—Electrothermal mechanisms using shape memory materials

Definitions

  • the invention relates to a low-voltage circuit breaker with at least one overcurrent release which, in the event of an overload or short-circuit current, acts on a movable contact piece which interacts with a fixed contact piece in an arcing hole chamber to separate the two, the fixed contact piece acting on a guard rail which is simultaneously designed as an arc guide rail and a clamp connection is applied, according to patent (patent application P 29 23 562.9).
  • the main patent assumes that a circuit breaker is designed for certain forward currents or has a certain switching capacity, but can be destroyed undefined in the event of certain overloads in the short circuit or in the event of continued normal shutdowns beyond the number of switching operations specified in the early regulations , where z. B. contact welds can occur, so that a safe disconnection of the circuit in the event of destruction is no longer guaranteed.
  • the invention according to the main patent is based on the task of creating a switch of the type described at the beginning with simple means, in which the disadvantages of the known switches are overcome, i. H. in which precautions have been taken which have the effect that the switch can only be destroyed at a precisely predetermined point if the switch is exposed to the possible overloads mentioned above, the safe disconnection of the circuit being ensured by the switching device being irreversibly interrupted.
  • This object has been achieved in that, in front of the contact area of the guide rail carrying the fixed contact piece, it melts at a predetermined melting point when a specific 1 t value is reached.
  • This predetermined melting point in the area of the fixed contact piece is formed by a constriction, which is formed for example by notches or bores or by slots or all measures together.
  • the object of the present invention is to further improve the circuit breaker according to the main patent (P 29 23 562.9).
  • the separation point is arranged as a predetermined melting point on the fixed contact or on the arc guide rail carrying the fixed contact piece
  • the separation point is according to the present patent formed as a constriction reducing the current-conducting cross section on the movable contact piece. If necessary, a stop can be provided in the swivel range of the movable contact piece, which prevents the moving contact piece rest from approaching the fixed contact piece after an interruption of the separation point.
  • the separation point has at least one component made of a memory alloy (shape memory material).
  • a component made of a memory alloy can be attached to the movable contact piece or at the free end of the movable contact lever, which component is dimensioned and designed such that it is in the event of an overtemperature or if the transition temperature is exceeded and the deformation occurs Spreading the contact pieces of the separation point causes.
  • the reference number 10 designates a circuit breaker in a base construction which is approximately T-shaped, wherein in the circuit breaker a switching mechanism 12, a magnetic release 14, a thermal release 16, and a contact lever 20 rotatably mounted on an axis 18 with a movable contact piece 22 and a fixed contact piece 24 are provided.
  • the fixed contact piece 24 is arranged on an arc guide rail 26, which, viewed downstream, delimits an arc-quenching plate packet 28 with individual arc-quenching plates on the bottom side of the circuit breaker 10.
  • the arc guide rail 26 is connected on the current input side to a connecting terminal 30;
  • a further connection terminal 32 is provided on the current output side, which is connected to the thermal release 16, so that a current flows from the input terminal 30 via the contact lever 20, the magnetic release 14 and the thermal release 16 to the other terminal 32 in the switched-on state.
  • the main patent contains a constriction point on the guide rail 26 in the area of the fixed contact piece 24, which causes an irreversible interruption of the current path by melting in the event of an excessive short circuit or in the case of other special occurrences.
  • FIGS. 2 and 3 show a view of the contact lever 20; one can see the arc guide rail 26 as well as the fixed contact 24 and an offset of the contact lever 20, which is designed as a movable contact 22 and is rotatably and fixedly mounted at 18.
  • a constriction 34 which is formed by constrictions 36 and 38 on both sides. This constriction can of course also be formed like the constriction that is attached to the arc guide rail in the area of the fixed contact piece.
  • a fixed stop 40 is provided, which prevents the rest of the contact lever from turning around, if necessary. to get in contact with electrically conductive parts.
  • FIG. 4 shows an arrangement similar to FIGS. 2 and 3 with the arc guide plate 26, the fixed contact piece 24, the movable contact lever 21 and the movable contact piece 22, which in a manner similar to the movable contact piece of FIG. 2 by means of an angled or bent portion is formed.
  • a strip 42 is attached from a shape memory material, which is designed so that it bends in the event of heating so that the movable contact lever 20 is rotated into the dashed position, the free end of the strip 42 against creates a stop 44 and thereby opens the contact point 22/24 by spreading.
  • the stop 44 corresponds approximately to the stop 40.
  • FIG. 5 shows an arc guide rail 50 which is connected via a strand 52 to an angularly bent component 54 made of a shape memory material; the angular arrangement of the component 54, together with a terminal lug 56 and the guide plate or the guide rail 50 form the same line section like the arc guide rail 26 through 30, to the terminal to which the moving contact piece 22 ge - genüberificat leg 58 of the component 54 is the solid Contact piece 24 attached.
  • FIG. 8 A similar configuration is shown in FIG. 8;
  • the arc guide rail 26 which has an offset 62 in the area of the fixed contact piece 24 towards the outside, ie towards the terminal. From this offset 62 in the direction of the axis 18 of the movable contact lever, a strip of a shape memory material is fastened, which practically extends in the extension of the arc guide rail and has a projection 64 serving as a stop at its free end.
  • the shape memory alloy or the strip 63 of the shape memory alloy bends into the dashed position and in this way lifts the movable contact lever from the fixed contact piece 24.
  • the molding 64 is of course made of an insulating material.
  • FIGS. 6 and 7. There is also the possibility of forming a separation point in the manner shown in FIGS. 6 and 7.
  • two strips 66 and 68 of a shape memory alloy which run parallel to one another and are fixed at the left end to a conductor track 70 or 72 inserted in the current path.
  • the current then flows in the direction of the arrows P1, P2, P3, P4 in the direction of P5, and flows parallel or antiparallel through the two adjacent strips 66 and 68.
  • the two free ends of the strips made of the shape memory material are connected to one another by means of a solder connection 74.
  • the solder joint is formed with such a soldering material which is approximately at the transition temperature of the shape memory material or at most only slightly below it.
  • This embodiment is particularly advantageous if a higher current flows during the spreading process of the two strips 66 and 68.
  • the resulting arc is then subject to the blowing effect of the asymmetrical magnetic field, which is caused by the current in the two strips, so that the point of interruption increases the extinguishing capacity.
  • the arrangement according to FIG. 6 can also be designed such that two strips of shape memory material are inserted into a power line path 80; these two strips have the reference numbers 82 and 84; they are arranged approximately parallel to one another and form an essentially straight current path. They are connected on the left and right to the strip line forming the current path 80 and are connected in the middle between the two strips 81 and 83 by means of a solder connection 86.
  • This solder has the same properties as the solder joint 74 of FIG 6.
  • the two strips 82 and 84 spread apart in the dotted position, wherein the L öt- point designed such that it for example in the conversion - and the spreading temperature melts.

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
EP80106618A 1979-11-05 1980-10-29 Disjoncteur de protection à basse tension Expired EP0028389B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106618T ATE5448T1 (de) 1979-11-05 1980-10-29 Niederspannungs-leitungsschutzschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2944579A DE2944579C2 (de) 1979-11-05 1979-11-05 Niederspannungs-Leitungsschutzschalter
DE2944579 1979-11-05

Publications (2)

Publication Number Publication Date
EP0028389A1 true EP0028389A1 (fr) 1981-05-13
EP0028389B1 EP0028389B1 (fr) 1983-11-23

Family

ID=6085156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106618A Expired EP0028389B1 (fr) 1979-11-05 1980-10-29 Disjoncteur de protection à basse tension

Country Status (4)

Country Link
EP (1) EP0028389B1 (fr)
JP (1) JPS5673831A (fr)
AT (1) ATE5448T1 (fr)
DE (1) DE2944579C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081290A1 (fr) * 1981-12-09 1983-06-15 Texas Instruments Incorporated Disjoncteur à sécurité intrinsèque
GB2209200A (en) * 1987-08-28 1989-05-04 Thorn Emi Flow Measurement Ltd Thermal cut-off valve

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19508498C2 (de) * 1995-03-09 1997-07-10 Siemens Ag Einrichtung zur Fernauslösung
DE19727152A1 (de) * 1997-06-26 1999-01-07 Abb Patent Gmbh Fehlerstromschutzschalter
DE19743037A1 (de) * 1997-09-30 1999-04-01 Siemens Ag Schutzschalter
CN104701106B (zh) * 2015-03-13 2017-02-01 山东大学 一种线路断路器用智能元件及其制备方法
CN104701107B (zh) * 2015-03-17 2016-08-24 山东大学 一种线路火灾断路器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2138438B2 (de) * 1971-07-31 1974-01-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Magnetische Auslösespule für Leitungsschutzschalter mit U-fbrmigem Eisenrückschluß
DE2337058A1 (de) * 1972-07-31 1974-02-14 Westinghouse Electric Corp Selbstschalter
DE2701884A1 (de) * 1976-01-19 1977-07-21 Delta Materials Research Ltd Stromueberlastungsschutz

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2923562A1 (de) * 1979-06-11 1980-12-18 Bbc Brown Boveri & Cie Leitungsschutzschalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2138438B2 (de) * 1971-07-31 1974-01-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Magnetische Auslösespule für Leitungsschutzschalter mit U-fbrmigem Eisenrückschluß
DE2337058A1 (de) * 1972-07-31 1974-02-14 Westinghouse Electric Corp Selbstschalter
DE2701884A1 (de) * 1976-01-19 1977-07-21 Delta Materials Research Ltd Stromueberlastungsschutz

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081290A1 (fr) * 1981-12-09 1983-06-15 Texas Instruments Incorporated Disjoncteur à sécurité intrinsèque
GB2209200A (en) * 1987-08-28 1989-05-04 Thorn Emi Flow Measurement Ltd Thermal cut-off valve

Also Published As

Publication number Publication date
ATE5448T1 (de) 1983-12-15
JPS5673831A (en) 1981-06-18
DE2944579C2 (de) 1986-02-20
DE2944579A1 (de) 1981-05-07
EP0028389B1 (fr) 1983-11-23

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