WO2022259347A1 - Coupe-circuit cc - Google Patents

Coupe-circuit cc Download PDF

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Publication number
WO2022259347A1
WO2022259347A1 PCT/JP2021/021668 JP2021021668W WO2022259347A1 WO 2022259347 A1 WO2022259347 A1 WO 2022259347A1 JP 2021021668 W JP2021021668 W JP 2021021668W WO 2022259347 A1 WO2022259347 A1 WO 2022259347A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
fixed
arc runner
arc
fixed contact
Prior art date
Application number
PCT/JP2021/021668
Other languages
English (en)
Japanese (ja)
Inventor
康平 松村
央 佐々木
知裕 仲田
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021564251A priority Critical patent/JP7031083B1/ja
Priority to EP21945025.1A priority patent/EP4354480A1/fr
Priority to PCT/JP2021/021668 priority patent/WO2022259347A1/fr
Publication of WO2022259347A1 publication Critical patent/WO2022259347A1/fr

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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
    • 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
    • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns
    • 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
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/346—Details concerning the arc formation chamber
    • 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
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/36—Metal parts

Definitions

  • This application relates to a DC circuit breaker.
  • a DC circuit breaker consists of a stator with a fixed contact, a mover with a movable contact that can be brought into and out of contact with the stator, an arc runner that transfers the arc generated between the contacts from the contact, and an arc extinguishing chamber that extinguishes the arc.
  • the arc runners are arranged in the vicinity of the stator and the mover, respectively.
  • the arc generated between the contacts due to the contact opening when the current is interrupted is commutated from the contact to the arc runner, and is driven to the arc extinguishing chamber by running the arc runner, where it is connected to the grid in the arc extinguishing chamber.
  • Current-limiting cut-off is performed against the generation of an arc voltage higher than the power supply voltage of the DC circuit by entering and dividing.
  • the above-mentioned arc runner structure can be expected to be effective in the low current range below the rated current where the arc is difficult to commutate from the contact to the arc runner.
  • the effect of shortening the commutation time due to the shape of the commutation destination is small, and there is a problem that it is difficult to improve the commutation and running performance over the entire range from small current to large current due to the shape of the arc runner.
  • the present application has been made to solve the above problems, and an object thereof is to provide a DC circuit breaker equipped with an arc runner that can obtain high breaking performance by shortening the commutation time. do.
  • the DC circuit breaker disclosed in the present application includes a stator having a fixed contact, a movable element having a movable contact that can be brought into and out of contact with the fixed contact, and a fixed contact and the movable contact arranged near the fixed contact and the movable contact.
  • the fixed contact has an end surface connected to the fixed arc runner and a side surface adjacent to the end surface, and the end surface of the fixed contact and the side surface adjacent to the end surface.
  • a fixed side arc runner is formed so as to cover the side surface.
  • the driving force in the direction of the arc runner on the fixed side is strengthened by generating an offset magnetic flux for the arc that has occurred, and the commutation time is shortened, resulting in high breaking performance. Obtainable.
  • FIG. 4 is a cross-sectional view showing movement of an arc in the breaking process of the DC circuit breaker;
  • FIG. 2 is a perspective view of a stator and stationary-side arc runners according to Embodiment 1;
  • FIG. 4 is a cross-sectional view of the stator and fixed-side arc runner of FIG. 3 taken along the line AA;
  • FIG. 4 is a front view of the stator and the fixed-side arc runner according to Embodiment 1 as seen from the contact contact surface side;
  • FIG. 7 is a cross-sectional view of a stator and a stationary-side arc runner according to Embodiment 2;
  • FIG. 11 is a cross-sectional view of a stator and fixed-side arc runners according to Embodiment 3;
  • FIG. 11 is a perspective view of a stator and stationary-side arc runners according to Embodiment 4;
  • FIG. 11 is a perspective view of a stator and stationary-side arc runners according to Embodiment 5;
  • FIG. 10 is a cross-sectional view of the stator and fixed-side arc runner of FIG. 9 taken along the line AA;
  • FIG. 1 is a cross-sectional view showing the outline of the overall configuration of the DC circuit breaker according to Embodiment 1
  • FIG. 2 is a cross-sectional view showing the movement of the arc in the breaking process of the DC circuit breaker
  • FIG. 4 is a perspective view showing an element and a fixed-side arc runner
  • FIG. 4 is a cross-sectional view taken along line AA of FIG.
  • the DC circuit breaker comprises a stator 3 composed of a fixed contact 1 and a fixed contact base 2, and a movable element 6 composed of a movable contact 4 and a movable contact base 5 which can be brought into and out of contact with the fixed contact 1.
  • a stator 3 composed of a fixed contact 1 and a fixed contact base 2
  • a movable element 6 composed of a movable contact 4 and a movable contact base 5 which can be brought into and out of contact with the fixed contact 1.
  • the detector 10 arranged in the lower conductor 9 operates by detecting the accident current, and the latch 11 holding the mover 6 is released to release the mover 6. is separated from the stator 3 and the opening operation is performed.
  • an arc 16 shown in FIG. 2 is generated between the fixed contact 1 and the movable contact 4 (hereinafter referred to as arcing).
  • the arc 16 generated between the contacts is generated by a fixed arc runner 12 arranged near the stator 3 (fixed contact 1) and a movable arc runner 13 arranged near the mover 6 (movable contact 4). , as indicated by arc 17 (hereinafter referred to as commutation).
  • the arc 17 generated between the fixed side arc runner 12 and the movable side arc runner 13 is generated by the electromagnetic force due to the current flowing through each arc runner or the conductive hot gas generated at the time of arc ignition. It travels as indicated by arc 18 in a direction away from the contacts due to flow.
  • the arc 18 enters the arc extinguishing chamber 15 in which a large number of grids 14 made of a thin plate-like magnetic material are arranged, as indicated by the arc 19.
  • the arc 19 is divided by the grid 14, and the arc voltage rises.
  • the current exceeds the power supply voltage of the circuit, the current limiting cutoff is performed.
  • the arc 16 generated by opening the movable contact 4 is commutated to the fixed side arc runner 12, travels in the opposite direction to the contact, and then enters the grid 14 to be cut off.
  • the structure of the stationary arc runner 12 will be described with reference to the perspective view and AA sectional view of the stationary arc runner 12 shown in FIGS.
  • parts other than the arc runner 12 on the fixed side and the stator 3 are omitted, and the aspect of the arc is also shown by cutting only the fixed side.
  • the fixed contact 1 has an end surface 1a (hereinafter referred to as an upper surface) connected to the fixed-side arc runner 12 and a side surface 1b adjacent to the upper surface 1a.
  • a side surface 1b of the fixed contact 1 faces a fixed-side arc runner 12, and the fixed-side arc runner 12 is formed so as to cover the upper surface 1a and the side surface 1b of the fixed contact 1.
  • the fixed-side arc runner 12 which is a magnetic material, up to the periphery of the fixed contact 1. More specifically, the fixed-side arc runner 12 is shaped to cover the side surface 1b of the fixed contact 1 from the top of the fixed contact 1, that is, the fixed-side arc runner 12 covers the fixed contact 1 from the top in a U-shape. Therefore, it has a structure that utilizes the biased magnetic flux.
  • FIG. 5 shows a view of the fixed side arc runner 12 from the contact surface side of the fixed contact 1 .
  • a current generated by an arc 16 generated between the fixed contact 1 and the movable contact 4 flows toward the front side 20 of the paper surface in FIG.
  • a magnetic body stationary arc runner 12
  • the magnetic flux passes through the magnetic body with high magnetic permeability, and the magnetic flux that is originally concentric with the current is biased ( deviation) occurs.
  • an electromagnetic force 22 is generated in the arc through which the current is flowing in the direction of the fixed-side arc runner 12, and the commutation time can be shortened due to rapid extension of the arc.
  • the reason why the side surface 1b of the fixed contact 1 is covered with the fixed side arc runner 12 is to generate a larger deviation of the magnetic flux and increase the electromagnetic force.
  • the fixed-side arc runner 12 may cover at least a part of the side surface 1b of the fixed contact 1. However, if the length of the side portion covering the fixed contact 1 of the fixed-side arc runner 12 is lower than the lower part of the contact, an arc will occur. The magnetic flux at locations lower than the position also passes through the stationary arc runner 12, and the electromagnetic force in the direction of the stationary arc runner 12 is reduced. Therefore, it is desirable that the length of the side portion of the fixed contact 1 by the fixed-side arc runner 12 is up to the intermediate position of the contact, which is about the arc firing position.
  • the upper portion (upper surface 1a) of the fixed contact 1 is brazed so as to come into contact with the fixed-side arc runner 12.
  • the arc generated between the contacts is commutated to the fixed-side arc runner 12, but if there is a step or gap between the fixed contact 1 and the fixed-side arc runner 12, the commutation is not performed smoothly, resulting in a decrease in breaking performance. Or it may lead to failure of cutoff. Therefore, by bringing the upper portion of the fixed contact 1 into contact with the fixed-side arc runner 12, a structure is adopted in which the commutation is promoted.
  • the contact direction height of the side portion of the fixed contact 1 of the fixed side arc runner 12 is flush with the contact contact surface or lower than the contact contact surface.
  • the height of the contact contact surface of the fixed contact 1 (the surface that contacts and separates from the movable contact 4) means the height from the lower surface of the fixed contact 1 (the surface opposite to the contact contact surface).
  • the height of the portion of the fixed-side arc runner 12 covering the side surface 1b of the fixed contact 1 is determined using a plane including the lower surface of the fixed contact 1 as a reference plane, and the contact direction (left side in FIG. 4) from this reference plane. direction).
  • the end surface (upper surface) of the fixed contact 1 and the side surface adjacent to the upper surface are covered with the fixed arc runner 12, and the upper portion of the fixed contact 1 and the fixed arc runner are covered. 12 was connected.
  • an eccentric magnetic flux is generated for the ignited arc, which strengthens the electromagnetic force in the direction of the fixed-side arc runner 12.
  • the commutation time is shortened, and high breaking performance is obtained. be able to.
  • the fixed-side arc runner 12 does not cover the back surface of the fixed contact 1, but in the second embodiment, the fixed-side arc runner 12 covers not only the side surface of the fixed contact 1 but also the back surface of the contact. shaped.
  • the structure is the same as that of the DC circuit breaker of Embodiment 1 except that the fixed-side arc runner 12 covers the back surface of the contact.
  • FIG. 6 is a cross-sectional view showing the fixed-side arc runner of the second embodiment. As shown in FIG. 6, since the fixed-side arc runner 12 covers the back surface of the contact, a high effect of improving the electromagnetic force can be obtained. Also, since the arc runner covering the back surface of the contact is arranged at a position that does not come into contact with the arc, it may be composed of a separate member from the fixed-side arc runner 12 .
  • Embodiment 3 the fixed contact base metal 2 is provided with the slit 23 .
  • This structure increases the electromagnetic force due to the self-magnetic field.
  • the structure of the DC circuit breaker is the same as that of the first and second embodiments except that slits 23 are provided.
  • FIG. 7 shows a side sectional view of the stationary arc runner 12 of this embodiment.
  • a slit 23 is formed in parallel with the contact surface of the fixed contact 1 in the rear portion of the contact back of the fixed contact base metal 2 .
  • FIG. 7 shows an example in which the slits 23 are formed in the stationary arc runner 12 of the second embodiment, slits may be formed in the stationary arc runner 12 of the first embodiment.
  • the slit 23 is formed in the portion of the fixed contact base metal 2 on the side of the fixed side arc runner 12 (in FIG. 7, the upper surface of the fixed contact base metal 2), so that the current path near the fixed contact 1 becomes a path 24 from below bypassing the slit 23, and the magnetic flux generated in the path 24 generates an electromagnetic force 25 in the direction of the fixed-side arc runner 12 for the arc 16 that is ignited between the contacts. This promotes arc elongation and shortens the commutation time.
  • the slits 23 provided in the fixed contact base metal 2 in the above structure are more effective the closer they are to the contact surface of the fixed contact 1, and the deeper the slits 23 are, the more effective they are. Further, it is desirable that the angle of the slit 23 is set in parallel with the contact surface of the fixed contact 1 because of high effect. However, even if it is changed to a predetermined angle other than that, an effect can be obtained. Furthermore, the position of the slit 23 may be determined in consideration of the mechanical strength that can withstand contact opening and closing and the limit value of temperature rise due to energization. good.
  • a part of the fixed-side arc runner 12 described in Embodiments 1 and 2 may be arranged behind the slit 23 to ensure strength.
  • This structure not only provides higher strength, but also enhances the effect of the electromagnetic force by providing deep slits.
  • the slit 23 is partially blocked by the fixed-side arc runner 12, a current path is generated that flows in the contact direction from above via the fixed-side arc runner 12.
  • FIG. due to the difference in conductivity between copper, which is a member of the fixed contact base metal 2, and iron, which is a member of the fixed side arc runner 12, the current in the lower path passing through copper becomes dominant, so the electromagnetic force is significantly increased. Strength is ensured without deterioration.
  • FIG. 8 is a perspective view showing the stator and fixed-side arc runners of this embodiment. As shown in FIG. 8, a rib 26 extending from the vicinity of the contact point to the terminal end is erected on the side surface of the stationary arc runner 12 .
  • the structure is the same as that of the DC circuit breakers of Embodiments 1 to 3 except that ribs 26 are provided.
  • the arc in the small current range below the rated current is smaller than the large current, so the electromagnetic force due to the self-magnetic field and the biased magnetic flux is low.
  • the electrical conductivity of the commutation destination space is difficult to increase because the contact points and arc runners are less likely to be ablated by the arc. For these reasons, the arc driving force is low, and commutation and running are difficult.
  • a structure can be used in which an air puffer is provided to blow air from the lower part of the contact when the contact is opened, and the arc is forcibly driven toward the arc extinguishing chamber 15 to cut off the arc.
  • the structure using the air puffer tends to increase the size of the device.
  • a rib 26 is erected on the side surface of the fixed-side arc runner 12, and the rib 26 is provided to the end of the fixed-side arc runner 12.
  • This structure not only improves commutation performance, but also improves running performance and promotes arc elongation to obtain a high arc voltage, thereby improving small current interruption performance. Even if this structure is provided in the arc runner 13 on the movable side, the same effect can be obtained.
  • the DC circuit breaker of this embodiment can be made smaller and lighter than a DC circuit breaker using an air puffer.
  • the rib 26 and the fixed side arc runner 12 are integrally formed by cutting, but they may be manufactured as separate members and fastened with bolts, rivets, or the like, or welded. Further, the ribs 26 may be formed not only by cutting, but also by sheet metal bending.
  • the degree of contact between the part that connects them (for example, the screwed part when fixing by screwing) and the other part is different. Since the current flows intensively in the joints where the degree of contact is strong, depending on the formation position of the joints, the current passing through the joints gives the arc an electromagnetic force in the direction of the contact, causing the arc to flow back to the contact side. It may happen.
  • the rib 26 is integrally formed with the fixed side arc runner 12, the current flow will not concentrate on the joint position, and only the arc driving force in the direction of the arc extinguishing chamber 15 can be obtained. More preferably, the ribs 26 on the side surfaces of the side arc runner 12 are formed integrally with the fixed side arc runner 12 .
  • Embodiment 5 the fixed-side arc runner 12, the fixed contact 1, and the fixed contact base metal 2 are integrally constructed.
  • 9 is a perspective view showing the stator and stationary arc runners of this embodiment, and FIG. 10 is a cross-sectional view of the stator and stationary arc runners of FIG. 9 taken along the line AA.
  • the structure is the same as that of the DC circuit breaker of Embodiment 4, except that it has an integral structure.
  • the fixed contact 1, the fixed contact base metal 2 and the fixed arc runner 12 are integrally brazed, and then cutting 27 is performed from the upper end surface of the fixed contact 1 to the fixed arc runner 12.
  • the boundary between the upper end surface of the fixed contact 1 and the fixed side arc runner 12 is smoothly connected.
  • the joint between the contact and the arc runner is cut until it touches the upper end of the arc runner, but cutting only the upper surface of the contact and the vicinity of the joint surface of the lower part of the arc runner is also effective.

Landscapes

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

Abstract

La présente invention concerne un coupe-circuit CC avec lequel il est efficace, lors de la coupure, de commuter rapidement un arc généré entre des contacts vers un canal d'arc afin de raccourcir le temps de coupure et d'augmenter la durée de vie du coupe-circuit par la réduction de l'usure des contacts. Cependant, il est difficile d'obtenir une commutation rapide sur toute la plage allant d'une région à faible courant inférieur ou égal à la valeur nominale à une région à courant élevé de court-circuit. Par conséquent, la formation d'un canal d'arc latéral fixe (12) sous une forme qui couvre le voisinage d'un contact fixe (1) permet de commuter un arc à une vitesse élevée de la région à faible courant à la région à courant élevé, et ainsi d'améliorer les performances de coupure.
PCT/JP2021/021668 2021-06-08 2021-06-08 Coupe-circuit cc WO2022259347A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2021564251A JP7031083B1 (ja) 2021-06-08 2021-06-08 直流遮断器
EP21945025.1A EP4354480A1 (fr) 2021-06-08 2021-06-08 Coupe-circuit cc
PCT/JP2021/021668 WO2022259347A1 (fr) 2021-06-08 2021-06-08 Coupe-circuit cc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/021668 WO2022259347A1 (fr) 2021-06-08 2021-06-08 Coupe-circuit cc

Publications (1)

Publication Number Publication Date
WO2022259347A1 true WO2022259347A1 (fr) 2022-12-15

Family

ID=81215071

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/021668 WO2022259347A1 (fr) 2021-06-08 2021-06-08 Coupe-circuit cc

Country Status (3)

Country Link
EP (1) EP4354480A1 (fr)
JP (1) JP7031083B1 (fr)
WO (1) WO2022259347A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62139024U (fr) * 1986-02-26 1987-09-02
JPH0922645A (ja) * 1995-07-05 1997-01-21 Fuji Electric Co Ltd 回路しゃ断器
JP2001160348A (ja) * 1999-12-03 2001-06-12 Mitsubishi Electric Corp 回路遮断器
JP2010170876A (ja) 2009-01-23 2010-08-05 Mitsubishi Electric Corp 回路遮断器
JP2014175113A (ja) * 2013-03-07 2014-09-22 Hitachi Industrial Equipment Systems Co Ltd 回路遮断器
JP2016033891A (ja) * 2014-07-31 2016-03-10 河村電器産業株式会社 直流遮断器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62139024U (fr) * 1986-02-26 1987-09-02
JPH0922645A (ja) * 1995-07-05 1997-01-21 Fuji Electric Co Ltd 回路しゃ断器
JP2001160348A (ja) * 1999-12-03 2001-06-12 Mitsubishi Electric Corp 回路遮断器
JP2010170876A (ja) 2009-01-23 2010-08-05 Mitsubishi Electric Corp 回路遮断器
JP2014175113A (ja) * 2013-03-07 2014-09-22 Hitachi Industrial Equipment Systems Co Ltd 回路遮断器
JP2016033891A (ja) * 2014-07-31 2016-03-10 河村電器産業株式会社 直流遮断器

Also Published As

Publication number Publication date
JP7031083B1 (ja) 2022-03-07
JPWO2022259347A1 (fr) 2022-12-15
EP4354480A1 (fr) 2024-04-17

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