EP1863056B1 - Schutzschalter - Google Patents

Schutzschalter Download PDF

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Publication number
EP1863056B1
EP1863056B1 EP20070010778 EP07010778A EP1863056B1 EP 1863056 B1 EP1863056 B1 EP 1863056B1 EP 20070010778 EP20070010778 EP 20070010778 EP 07010778 A EP07010778 A EP 07010778A EP 1863056 B1 EP1863056 B1 EP 1863056B1
Authority
EP
European Patent Office
Prior art keywords
magnetic bodies
circuit breaker
contactor
arc
current
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.)
Not-in-force
Application number
EP20070010778
Other languages
English (en)
French (fr)
Other versions
EP1863056A1 (de
Inventor
Masahiro Fushimi
Kenichi Nishina
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP1863056A1 publication Critical patent/EP1863056A1/de
Application granted granted Critical
Publication of EP1863056B1 publication Critical patent/EP1863056B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • 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
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H01H71/0235—Contacts and the arc extinguishing space inside individual separate cases, which are positioned inside the housing of the circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/0006—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches
    • 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
    • H01H71/42—Induction-motor, induced-current, or electrodynamic release mechanisms
    • H01H71/43—Electrodynamic release mechanisms
    • 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
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/443—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using permanent magnets

Definitions

  • the present invention relates to a circuit breaker with a current limiting capability.
  • a circuit breaker in the related art is configured in such a manner that a stationary contactor and a movable contactor form a circuit to cause the movable contactor to act repulsively, and a contact-parting electromagnetic force of the movable contactor and an arc driving force in the grid direction are increased by disposing magnetic bodies covered with an insulation cover on the side surfaces in close proximity to the movable contact of the movable contactor and the stationary contact of the stationary contactor as is disclosed, for example, in JP-A-2002-8508 (see Fig. 1 and the description thereof).
  • the insulation covers are provided to guard the magnetic bodies against an arc and to enhance the current limiting capability by raising a pressure nearby the contacts through generation of a cracked gas.
  • the insulation covers are disposed apart from each other by a length of a straight line linking the movable contact and the stationary contact, that is, by a specific distance from an arc occurring at the time of interruption.
  • the invention was devised in view of the foregoing, and therefore has an advantage to achieve a further enhancement of the current limiting capability by securing the withstand voltage capability between the movable contact and the stationary contact.
  • the circuit breaker includes the stationary contactor, the movable contactor that opens and closes with respect to the stationary contactor, and a pair of magnetic bodies disposed on the both sides of the switching space that accommodates the stationary contactor and the movable contactor and permits a switching action of the movable contactor so as to be able to move in a direction to come closer relatively with respect to each other, and is configured in such manner that when an interruption current that causes an interruption action of the movable contactor reaches or exceeds a specific value, the both magnetic bodies are moved in the direction to come closer relatively with respect to each other by an electromagnetic attraction force acting between the both magnetic bodies to narrow the switching space within the limits of permitting the switching action of the movable contactor, whereas when the electromagnetic attraction force becomes smaller as the interruption current is made smaller by a current limiting action, the both magnetic bodies return to the original positions. It is thus possible to achieve an advantage that the current limiting capability can be further enhanced by securing the withstand voltage capability between the movable contact of the movable
  • Fig. 1 is a perspective view showing one example of the overall configuration of a circuit breaker.
  • Fig. 2 is a perspective view showing one example of the configuration of a major portion of an arc extinction unit in the circuit breaker.
  • Fig. 3 is a transverse plan view when the cross section of a major portion taken along the line A-A in Fig. 1 is viewed in the direction indicated by an arrow, showing a state in the case of a region where a current is relatively small.
  • Fig. 4 is a transverse plan view when the cross section of the major portion taken along the line A-A in Fig.
  • FIG. 1 is viewed in the direction indicated by an arrow, showing a state in the case of a region where a current is relatively large.
  • FIG. 5 is a perspective view showing an exploded diagram of one example of components in the interior of an arc extinction chamber.
  • like members are labeled with like reference numerals.
  • the circuit breaker is configured in such a manner that plural arc extinction units 23 are linked to one another with a cross bar 27 extending throughout the arc extinction units 23, and a mechanism portion 25 that opens and closes the contacts described below via the cross bar 27, a relay portion 26 that is provided with a connection terminal 26a to the load side and activates the mechanism portion 25 upon detection of an abnormal current, a handle 29 used to manually operate the mechanism portion 25, and the plural arc extinction units 23 are accommodated in a base 30 and a cover 28 attached above the base 30 in a re-attachable manner.
  • Each arc extinction unit 23 is provided with an exhaust hole 23b, and a stationary contactor 5 forming the connection terminal 5a is disposed in the interior thereof.
  • the stationary contactor 5 is provided with a parallel conductor 7 that allows contact parting by causing the movable contactor 3 to act repulsively with an electromagnetic force when a large current flows.
  • a stationary contact 6 is formed at the end terminal of the parallel conductor 7.
  • a movable contact 2 is disposed to the movable contactor 3 on the surface opposing the stationary contact 6.
  • the movable contactor 3 is held by a rotor 19 coupled to the cross bar 27, and is configured in such a manner that the movable contact 2 is allowed to move away from and come closer to the stationary contact 6 as the movable contact 2 rotates about the rotational shaft 19a of the rotor 19.
  • An insulation material 11 is disposed on the top surface of the stationary contactor 5 as a protection against an arc heat. Further, plural magnetic arc extinction plates 16 held by a pair of arc extinction side plates 15 in a space between the arc extinction side plates 15 are disposed on the top of the insulation material 11. In addition, the pair of arc extinction side plates 15 and the plural magnetic arc extinction plates 16 together form an arc extinction plate unit 156.
  • a pair of magnetic bodies 10 is disposed in close proximity to the contacts inside the arc extinction unit 23. At the occurrence of a large current, these magnetic bodies 10 enhance an electromagnetic force that causes the movable contactor 3 to act repulsively for the movable contact 2 to be opened from the stationary contact 6, and an electromagnetic force that guides an arc between the stationary contactor 5 having the stationary contact 6 and an arc runner 9 and the movable contactor 3 in a direction toward the magnetic arc extinction plates 16.
  • Each magnetic body 10 is covered with an insulation cover 13 made of an insulation material to protect the magnetic body 10 from the arc.
  • the insulation cover 13 made of an insulation material generates a cracked gas with an arc heat and enhances the current limiting capability by raising a pressure nearby the contacts.
  • the insulation cover 13 is configured in such a manner that springs 14, which push the insulation cover 13 in a direction to move away from the contacts, are disposed in a space between spring bearing portions 13a of the insulation cover 13 and spring bearing portions 23a of the arc extinction unit 23.
  • the insulation covers 13 are in a state where they have been moved in a direction to move away from the stationary contactor 5 by the force Fb of the springs 14.
  • the inside width B of the insulation covers 13 is therefore maintained at or greater than a distance not to cause an dielectric breakdown between the movable contact 2 and the stationary contact 6 at the time of contact parting.
  • the electromagnetic attraction force Fa acting on the magnetic bodies 10 becomes larger due to a large current to the extent that the electromagnetic attraction force Fa acting on the magnetic bodies 10 exceeds the spring force Fb, as is shown in Fig. 4 , the magnetic bodies 10 and the insulation covers 13 are moved in a direction to come closer to the stationary contactor 5 by the electromagnetic attraction force Fa.
  • the inside width of the insulation covers 13 therefore reaches the inside width C that secures a smaller distance than the inside width B.
  • the switching space 53ps that permits the switching action of the movable contactor 3 with respect to the stationary contactor 5 is in a narrower state than in the state (see Fig. 3 ) where the inside width of the insulation covers 13 is maintained at the inside width B.
  • the circuit breaker according to the first embodiment as described above includes a stationary contactor, a movable contactor that opens and closes with respect to the stationary contactor, and a pair of magnetic bodies disposed on the both sides of a switching space that accommodates the stationary contactor and the movable contactor and permits a switching action of the movable contactor so as to be able to move in a direction to come closer relatively with respect to each other.
  • the circuit breaker is configured in such a manner that when an interruption current that causes an interruption action of the movable contactor reaches or exceeds a specific value, the both magnetic bodies are moved in the direction to come closer relatively with respect to each other by an electromagnetic attraction force acting between the both magnetic bodies to narrow the switching space within the limits of permitting the switching action of the movable contactor, and when the electromagnetic attraction force becomes smaller as the interruption current is made smaller by a current limiting action, the both magnetic bodies return to the original positions.
  • the insulation materials 13 that generate a cracked gas with an arc heat are interposed between the respective magnetic bodies 10 and the switching space 53ps.
  • the stationary contactor 5, the movable contactor 3, and the switching space 53ps are housed in the arc extinction unit 23 and the magnetic bodies 10 are disposed on the both side walls of the arc extinction unit 23.
  • the magnetic bodies 10 are incorporated into magnetic body incorporation holes 23sr made in the both side walls of the arc extinction unit 23 so as not to stick out to the outside from the both side wall surfaces 23ss.
  • the accident current is equal to or greater than the specific value, and the overload current is lower than the specific value. More specifically, the respective magnetic bodies 10 and the insulation materials 13 move when the accident current flows between the two contacts 3 and 5 so that the current is limited effectively, whereas they do not move when the overload current flows so that a sufficient withstand voltage is maintained.
  • the first embodiment of the invention achieves a circuit breaker with an excellent current limiting capability by raising a pressure nearby the contacts abruptly when a large current is interrupted.
  • the first embodiment of the invention makes it possible to enhance the current limiting capability markedly by moving the insulation covers close to the arc only when the circuit breaker interrupts a relatively large current.
  • the first embodiment of the invention is configured in such a manner that the insulation covers covering the magnetic bodies are attached to the arc extinction unit in such a manner so as to allow the magnetic bodies and the insulation covers to move as one piece.
  • the insulation covers covering the magnetic bodies in the circuit breaker are able to come closer to an arc when a large current is interrupted, the current limiting capability can be enhanced markedly. Also, because a sufficient distance can be secured from the insulation covers to an arc in other cases, a sufficient withstand voltage capability can be achieved.
  • Fig. 6 shows an example of the waveforms of a current at the time of interruption and a pressure nearby the arc, indicating that a large current starts to flow at the time T0, and the pressure in close proximity to the arc starts to rise at the time T1 due to a cracked gas generated from the insulation covers 13 with the arc.
  • the time at which the magnetic bodies 10 and the insulation covers 13 start to operate is later than the time T1, the magnetic bodies 10 and the insulation covers 13 operate slower or they fail to move as the pressing force Fc by the pressure nearby the contacts increases abruptly.
  • Fig. 7 shows the release characteristic of the circuit breaker.
  • the abscissa is used for a current and the ordinate is used for a release action time.
  • the springs 14 that push the magnetic bodies 10 and the insulation covers 13 in a direction to move way from the contacts need to be appropriately strong so as not to lose their own function by a molten material produced at the time of interruption and lodged therein. It is at least a region exceeding the instantaneous release of the circuit breaker specified in Fig. 7 where the current limiting capability is susceptible to a pressure nearby the arc.
  • the configuration to make plural springs 14 to have different spring forces has not been described.
  • the insulation covers 13 on the side maintained at the inside width D operate on a smaller current in comparison with those maintained at the inside width E, thereby establishing the relation, inside width D ⁇ inside width E.
  • the exhaust efficiency toward the exhaust hole 23b is therefore hardly impaired, and the strength of the arc extinction unit 23 can be lower.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)

Claims (8)

  1. Unterbrecher versehen mit einem stationären Schütz und einem beweglichen Schütz, der in Abhängigkeit des stationären Schütz öffnet und schließt, gekennzeichnet durch:
    ein Paar auf beiden Seiten des Schaltraums (53ps) vorgesehener magnetischer Körper (10), die den stationären Schütz (5) und den beweglichen Schütz (2) aufnehmen und einen Schaltvorgang des beweglichen Schütz (2) erlauben, um es dem beweglichen Schütz (2) zu ermöglichen sich in eine Richtung zu bewegen in der sie sich relativ näher kommen,
    dadurch gekennzeichnet, dass
    sobald ein eine Unterbrechung des beweglichen Schützes (2) verursachender Unterbrecherstrom einen bestimmten Wert erreicht oder überschreitet, die beiden magnetischen Körper (10, 10) in die Richtung bewegt werden in der sie sich durch eine elektromagnetische Anziehungskraft, die zwischen den magnetischen Körpern (10, 10) wirkt, relativ annähern, um den Schaltraum (53ps) in den Grenzen, die den Schaltvorgang des beweglichen Schützes (2) erlauben, zu verengen, und
    sobald die elektromagnetische Anziehungskraft im Zuge eines sich verringernden Unterbrecherstroms kleiner wird, die beiden magnetischen Körper (10, 10) wieder in ihre ursprüngliche Positionen zurückkehren.
  2. Unterbrecher nach Anspruch 1, dadurch gekennzeichnet, dass die beiden magnetischen Körper (10, 10) sich in die Richtung bewegen in der sie sich relativ in Bezug aufeinander einander annähern bevor ein Lichtbogen zwischen dem stationären Schütz (5) und dem beweglichen Schütz (2) auftritt.
  3. Unterbrecher nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die beiden magnetischen Körper (10, 10) sich in die Richtung bewegen in der sie sich relativ in Bezug aufeinander einander annähern, sobald ein durch den stationären Schütz (5) und den beweglichen Schütz (2) fließender Strom einen sofortigen Auslösebereich des Unterbrechers überschreitet.
  4. Unterbrecher nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Größe der Relativmomente der beiden magnetischen Körper (10, 10) sich an einer Lichtbogeneinleitungsseite und auf einer Lichtbogenverlängerungsseite unterscheidet.
  5. Unterbrecher nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass ein Isoliermaterial (13, 13) das ein Spaltgas mit der Lichtbogenhitze erzeugt zwischen den beiden magnetischen Körpern (10, 10) und dem Schaltraum (53ps) eingebracht ist.
  6. Unterbrecher nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der stationäre Schütz (5), der bewegliche Schütz (2), und der Schaltraum (53ps) in einer Lichtbogenlöschungseinheit (23) untergebracht sind, und die magnetischen Körper auf beiden Seitenflächen der Lichtbogenlöschungseinheit (23) vorgesehen sind.
  7. Unterbrecher nach Anspruch 6, dadurch gekennzeichnet, dass die magnetischen Körper (10, 10) in in den beiden Seitenflächen der Lichtbogenlöscheinheit (23) ausgebildeten Magnetkörperintegrationslöchern (23sr) integriert sind, um nicht zu einer Außenseite der beiden Seitenflächenoberflächen (23ss) hin überzustehen.
  8. Unterbrecher nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass ein Unfallstrom gleich oder größer als der bestimmte Wert ist, und ein Überlaststrom geringer als der bestimmte Wert ist.
EP20070010778 2006-06-02 2007-05-31 Schutzschalter Not-in-force EP1863056B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006154776A JP2007324038A (ja) 2006-06-02 2006-06-02 回路遮断器

Publications (2)

Publication Number Publication Date
EP1863056A1 EP1863056A1 (de) 2007-12-05
EP1863056B1 true EP1863056B1 (de) 2009-04-08

Family

ID=38191851

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070010778 Not-in-force EP1863056B1 (de) 2006-06-02 2007-05-31 Schutzschalter

Country Status (4)

Country Link
EP (1) EP1863056B1 (de)
JP (1) JP2007324038A (de)
CN (1) CN101083187B (de)
DE (1) DE602007000840D1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007054958A1 (de) * 2007-11-17 2009-06-04 Moeller Gmbh Schaltgerät für Gleichstrom-Anwendungen
CN104143492B (zh) * 2014-07-31 2016-03-30 华通机电股份有限公司 一种接线座辅助灭弧的小型断路器
US9552951B2 (en) 2015-03-06 2017-01-24 Cooper Technologies Company High voltage compact fusible disconnect switch device with magnetic arc deflection assembly
US9601297B2 (en) 2015-03-23 2017-03-21 Cooper Technologies Company High voltage compact fuse assembly with magnetic arc deflection
US10854414B2 (en) 2016-05-11 2020-12-01 Eaton Intelligent Power Limited High voltage electrical disconnect device with magnetic arc deflection assembly
US10636607B2 (en) 2017-12-27 2020-04-28 Eaton Intelligent Power Limited High voltage compact fused disconnect switch device with bi-directional magnetic arc deflection assembly
KR102578555B1 (ko) * 2020-03-13 2023-09-14 엘에스일렉트릭(주) 기중 차단기
JP7330385B2 (ja) * 2020-08-05 2023-08-21 三菱電機株式会社 直流遮断器

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3166890B2 (ja) * 1994-05-24 2001-05-14 富士電機株式会社 回路遮断器の消弧装置
JP4360013B2 (ja) * 2000-06-27 2009-11-11 三菱電機株式会社 回路遮断器

Also Published As

Publication number Publication date
CN101083187A (zh) 2007-12-05
EP1863056A1 (de) 2007-12-05
CN101083187B (zh) 2012-01-04
DE602007000840D1 (de) 2009-05-20
JP2007324038A (ja) 2007-12-13

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