WO2016027499A1 - Switching device - Google Patents
Switching device Download PDFInfo
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- WO2016027499A1 WO2016027499A1 PCT/JP2015/060812 JP2015060812W WO2016027499A1 WO 2016027499 A1 WO2016027499 A1 WO 2016027499A1 JP 2015060812 W JP2015060812 W JP 2015060812W WO 2016027499 A1 WO2016027499 A1 WO 2016027499A1
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- arc
- magnet
- contact
- magnetic
- fixed contact
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- 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
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- 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
-
- 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
Definitions
- This invention relates to a switching device such as a switch, a switch, a circuit breaker, an electromagnetic contactor, a relay, etc., for cutting off current.
- the arc generated between the contacts is stretched to increase the arc resistance, and the arc voltage is increased to cut off the current.
- the technique of extending the arc is important.
- the arc length is extended by linking a magnetic field line of a permanent magnet to the arc and applying a Lorentz force to the arc (for example, Patent Document 1).
- the conventional switchgear disclosed in Patent Document 1 is a switchgear in which a magnet is mounted in the arc extinguishing chamber in order to extinguish the arc.
- a magnet is mounted in the arc extinguishing chamber in order to extinguish the arc.
- the shut-off reliability was lowered.
- this means has a problem that the apparatus becomes large.
- the arc that is driven and extended to the outside of the surface facing the magnetic pole surface of the magnet not only makes the magnetic drive action difficult, but also causes the magnetic field lines generated from the magnet to cause an unexpected electromagnetic force. , The reliability of the interruption is reduced.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a switchgear that can ensure sufficient shutoff reliability even when a small magnet is used regardless of the direction of current. Yes.
- the switchgear according to the present invention is configured to open and close the fixed contact having a fixed contact, the movable contact having a movable contact, the movable contact having a movable contact, and the fixed contact and the movable contact.
- An opening / closing mechanism a magnet for generating a magnetic field for extending an arc generated between the fixed contact and the movable contact, and one end of the fixed contact when the fixed contact and the movable contact are separated;
- a magnetic body arranged so as to be close to an arc generation region between a child and the movable contact and having the other end in contact with one magnetic pole surface of the magnet, the magnet and the magnetic
- An insulating cover that protects a body and isolates arc extension spaces in which the energization direction of the arc is different, and the magnet is disposed in a region other than the arc generation region.
- the arc generated between the contacts can be driven in the direction of the magnet along the side surface of the attracting rod, which is a magnetic body, regardless of the direction of the current.
- the arc travels and expands in the direction of the magnet while being driven along the side surface of the attracting rod, which is a magnetic material, so that the arc is rapidly cooled.
- an inexpensive and small switchgear can be obtained while maintaining high shutoff reliability even when a reverse polarity current flows.
- FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. It is explanatory drawing for demonstrating the arc-extinguishing operation
- FIG. 6 is a cross-sectional view taken along line AA ′ in FIG. 5. It is a sectional side view which shows the opening state of the switchgear in Embodiment 4 of this invention.
- FIG. 8 is a cross-sectional view taken along line AA ′ of FIG.
- FIG. Embodiment 1 of the present invention will be described below with reference to the drawings.
- the same reference numerals denote the same or corresponding parts.
- FIG. 2 is a cross-sectional view taken along line AA ′ of FIG.
- a switching device 100 according to Embodiment 1 of the present invention includes a fixed contact 1 having a fixed contact 1a, a movable contact 2 having a movable contact 2a, a fixed contact 1a, and a movable contact 2a.
- an opening / closing mechanism 103 for performing the opening / closing operation.
- the switchgear 100 includes a magnet 4 that generates a magnetic field for extending the arc A generated between the fixed contact 1 and the movable contact 2 when the fixed contact 1a and the movable contact 2a are separated.
- the opening / closing device 100 is arranged so that one end thereof is close to the arc generation region 20 between the fixed contact 1 and the movable contact 2, and the other end is on one magnetic pole surface of the magnet 4.
- a suction rod 3 made of a long magnetic material is provided so as to be in contact therewith.
- the magnet 4 is disposed in a region other than the arc generation region 20.
- the opening / closing device 100 includes an insulating cover 3c that protects the magnet 4 and the suction rod 3 made of a long magnetic body.
- the insulating cover 3c is made of a resin material such as nylon, for example.
- the arc generation region 20 indicates a space between the fixed contact 1 and the movable contact 2 surrounded by a dotted line in FIG.
- the switchgear 100 includes a fixed-side terminal portion 11 and a movable-side terminal portion that are connected to an external power circuit at both ends of a casing formed by a case 101 made of an insulator. 12 is provided, and an arc extinguishing chamber 102 for extinguishing the arc is provided in the lower part.
- the arc extinguishing chamber 102 has a fixed contact 1 formed integrally with the fixed terminal portion 11 and provided with a fixed contact 1a at a predetermined portion, and a movable contact 2a contacting and separating from the fixed contact 1a.
- An elongated magnetic element whose one end is disposed in the vicinity of the arc generation region 20 so as to face a space sandwiched between the movable contact 2 provided to move, and the fixed contact 1 and the movable contact 2.
- a suction bar 3 made of a body and a magnet 4 that is disposed in contact with the suction bar 3 and generates a magnetic field for extending the arc A generated between the fixed contact 1 and the movable contact 2 are disposed. .
- the magnet 4 that controls and extends the arc A generated between the two contacts when the two contacts are separated, and one end of the arc is generated.
- the basic structure is a suction rod 3 made of a long magnetic body, which is disposed in the vicinity of the region 20 and whose other end is disposed in contact with one magnetic pole surface of the magnet 4.
- the arc A is extended along the longitudinal side surface of the suction bar 3 made of a long magnetic material by the magnetic field generated by the magnet 4.
- a space between the side surface of the suction bar 3 located on the right side of the arc generation region 20 in FIG. 1 and the magnetic reinforcing plate 6 is defined as an arc extension space 21.
- the same effect can be obtained even if the attracting rod 3 made of a long magnetic material is in the form of a round bar, a rectangular parallelepiped, or a cylindrical or polygonal bar. Further, as will be described later, the suction bar 3 made of a long magnetic material is protected by an insulating cover 3c for magnetic material provided so as to face the generation area of the arc A having a conduction direction in front of the paper surface. Yes. A magnetic reinforcing plate 6 described later is attached to the magnet 4.
- FIG. 3 is an explanatory diagram for explaining an arc extinguishing operation of the switchgear according to Embodiment 1 of the present invention.
- An attracting rod 3 made of a long magnetic material protected by an insulating cover 3c for magnetic material is disposed, and the end surface of the attracting rod 3 opposite to the arc generation position is disposed on the end of the permanent magnet 41 having an N pole.
- the arc extinguishing principle will be described with reference to the model shown in FIG. 3 arranged so as to be in contact with the surface, divided into five stages of FIG. 3A to FIG. In FIG. 3, first, in FIG.
- the magnetic field lines M generated from the permanent magnet 41 are induced by the attracting rod 3, and the linkage to the arc from the tip of the attracting rod 3 toward the arc.
- a magnetic field is generated.
- the Lorentz force acts on the arc by the interlinkage magnetic field, and the arc is driven in the lower direction in FIG. 3A.
- symbol 8 shows an arc and its electric current direction
- symbol 9 shows the action direction of Lorentz force.
- FIG. 3B which is an arc extinguishing progress stage
- the magnetic field lines M formed so as to wrap around the arc driven at the stage of FIG. 3A from the tip of the attracting rod 3 to the S pole side of the permanent magnet 41 are chained. Come to fuck.
- the arc is drawn into the arc extension space 21 that extends to the side surface portion of the suction bar 3 in the longitudinal direction.
- symbol 10 shows the arc in case a current direction is reverse.
- the arc drawn into the arc extension space 21 is drawn further to the back by the magnetic force lines M generated on the normal line from the side surface of the suction bar 3.
- the strength of the magnetic field generated from the side surface of the suction bar 3 increases, so that it becomes difficult for the arc to be detached from the suction bar 3, and the arc is stably transferred to the rear side (right side) of the suction bar 3. Can be stretched.
- the magnetic field lines interlinking with the arc drawn in the back include many magnetic lines that circulate to the south pole side of the permanent magnet 41, and the interlinkage magnetic field by the magnetic field lines in this direction (right side in the figure) is A force for attracting the arc to the inside of the suction rod 3 is caused.
- FIG. 3D which is a progress stage of arc extinction
- Lorentz force that pushes into the inside of the suction bar 3 with a stronger force acts on the arc in the vicinity of the magnetic insulating cover 3 c that protects the suction bar 3. It becomes like this.
- the arc is compressed toward the magnetic insulating cover 3c, and the resistance inside the arc increases rapidly.
- the ablated gas generated by the arc heat from the arc exposed surface of the magnetic insulating cover 3c is blown toward the arc, thereby cooling the arc and further increasing the resistance inside the arc.
- FIG. 3D which is a progress stage of arc extinction
- the same effect can be obtained even when the energization direction is reversed.
- the arc extends so as to be symmetric with respect to the axis of the suction bar 3 as shown in FIG. I will do it.
- the same effect can be obtained even when the direction of the magnetic pole surface of the permanent magnet 41 (or the magnet 4) is reversed, and the arc is extended to be the target on the axis of the suction bar 3 in each arc extinguishing stage. I will do it.
- the suction rod 3 and the permanent magnet 41 (or the magnet 4) the arc can be driven and extended in the same direction, and the reliability of interruption can be increased without increasing the size of the switchgear 100. Can increase the sex.
- the switchgear 100 is provided with an arc extension space 21, and by arranging the permanent magnet 41 (or magnet 4) in the arc extension space 21, it is possible to extend the length that can extend the arc and further increase the arc resistance. Can do. Further, by providing a magnetic reinforcing plate 6 made of a magnetic material on the opposite (non-attracting bar side) magnetic pole surface of the permanent magnet 41 (or magnet 4) adjacent to (disposed in contact with) the attracting bar 3.
- the insulating cover 3c is provided with a wall that separates the two arc extension spaces 21 (spaces on both side surfaces of the suction bar 3).
- the insulating cover 3c forms a wall that separates two arc extension spaces 21 having different arc energization directions, thereby preventing the arc from flowing from one arc extension space 21 to the other arc extension space 21. This makes it possible to prevent the arc from extending stably.
- the magnet 4 is composed of the permanent magnet 41, a constant magnetic flux can be applied to the arc, so that the magnetic flux generated from the current-carrying conductor is in a current region (eg, 1 kA).
- the permanent magnet 41 is used as a magnet to be used.
- a coiled conductor electrically connected to either one of the contacts or an external power source is used as a suction rod.
- the arc can be extinguished by the same phenomenon as described above even if it is wound around a part of the periphery of 3 and a part of the suction rod 3 is configured as an electromagnet (not shown).
- the current range in which the effect can be exhibited most is different.
- the current region is relatively weak.
- the effect is exhibited (for example, less than 1 kA), and when an electromagnet (not shown) is used, the effect is exhibited in a relatively large current region (for example, 1 kA or more) where the magnetic flux generated from the current flowing through the conductor is large.
- the arc A generated regardless of the energization direction can be drawn into the back of the suction bar 3, the arc can be extended, and then cooled and extinguished.
- the arc can be extended and cooled in the permanent magnet arrangement direction regardless of the direction of the current, so that the interruption reliability can be ensured and the switchgear 100 can be downsized even when the current flows backward. Further, the isolation wall formed by the insulating cover 3c can prevent the arc from entering the other arc extension space 21 and stabilize the interruption performance.
- FIG. FIG. 4 is a side cross-sectional view showing the opening state of the switchgear according to Embodiment 2 of the present invention.
- the suction rod 3 is made of a long magnetic material.
- the shape of the suction rod 3 varies depending on the energization direction.
- the arc is extended and arranged so as to separate the space where the arc extends.
- magnetic saturation in the vicinity of the surface in contact with the magnet 4 in the attraction bar 3 can be suppressed, and an arc generated between the contacts can be efficiently drawn into the arc extension space 21.
- the suction bar 3 is enlarged, the region in the arc extension space 21 where the magnetic field strength is increased is also expanded, so that the extension state of the arc is easily maintained and the interruption reliability is improved.
- FIG. 5 is a side sectional view showing an open state of the switchgear according to Embodiment 3 of the present invention.
- FIG. 6 is a cross-sectional view taken along line AA ′ of FIG.
- the insulating cover 3 c forms a wall that separates two arc extension spaces 21 having different arc energization directions, and surrounds the arc at the time of extension. Insulating cover 3c is arranged like this.
- the case 101 of the switchgear 100 is made of a material that does not easily ablate so as not to be worn even when exposed to the generated arc heat, the efficiency of spraying the ablated gas onto the arc is low.
- the insulating cover 3c can be formed of a material that is easily ablated, and therefore, the arc at the time of expansion is disposed so as to be surrounded by the insulating cover 3c, thereby spraying the ablated gas onto the arc. Efficiency can be improved and shut-off reliability can be increased.
- the third embodiment may be combined with the shape of the suction rod 3 of the second embodiment, and the combination further improves the blocking reliability.
- FIG. 7 is a side sectional view showing an open state of the switchgear according to Embodiment 4 of the present invention.
- FIG. 8 is a cross-sectional view taken along line AA ′ of FIG.
- the protrusion 7 is provided at the center of the arc (the center of the arc extension space 21) so that the arc can collide or compress.
- the protrusion 7 is made of the same material as the insulating cover 3 c and has a shape protruding from the side surface of the case 101.
- the arc collides or compresses at the projecting portion 7 and the arc is stretched around the projecting portion 7 to further improve the cooling efficiency of the arc.
- the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.
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- Arc-Extinguishing Devices That Are Switches (AREA)
- Breakers (AREA)
Abstract
Description
従来、一般的にアークを引き伸ばすには、永久磁石の磁力線をアークに鎖交させ、アークにローレンツ力を作用させることでアーク長を引き伸ばしている(例えば、特許文献1)。 In the switchgear, the arc generated between the contacts is stretched to increase the arc resistance, and the arc voltage is increased to cut off the current. In particular, in the DC switchgear, it is necessary to make the arc voltage higher than the power supply voltage and generate a current zero point to cut off, so the technique of extending the arc is important.
Conventionally, in general, in order to extend an arc, the arc length is extended by linking a magnetic field line of a permanent magnet to the arc and applying a Lorentz force to the arc (for example, Patent Document 1).
また、アークが逆方向に駆動した場合でも遮断できるように、消弧空間を拡げる手段もあるが、この手段では装置が大形化する問題がある。また、磁石の磁極面との対向面よりも外側まで駆動、伸長したアークには、磁気駆動作用が働きにくくなるだけでなく、磁石から生成される磁力線が予期しない向きの電磁力を引き起すため、遮断の信頼性が低下する。
このような開閉装置では、アークに所望のローレンツ力を作用させるために、このローレンツ力の作用面に対し一様な方向の磁力線を作用させる必要がある。アークに対して一様な方向の磁力線を鎖交させるためには、このローレンツ力の作用面よりも永久磁石の磁極面を大きくしなければならず、高コストな構成となり、配置スペースを確保することが困難となる。 However, the conventional switchgear disclosed in
In addition, there is a means for expanding the arc extinguishing space so that the arc can be cut off even when the arc is driven in the opposite direction. However, this means has a problem that the apparatus becomes large. In addition, the arc that is driven and extended to the outside of the surface facing the magnetic pole surface of the magnet not only makes the magnetic drive action difficult, but also causes the magnetic field lines generated from the magnet to cause an unexpected electromagnetic force. , The reliability of the interruption is reduced.
In such a switchgear, in order to apply a desired Lorentz force to the arc, it is necessary to apply a magnetic force line in a uniform direction to the working surface of the Lorentz force. In order to link magnetic field lines in a uniform direction to the arc, the magnetic pole surface of the permanent magnet must be made larger than the working surface of the Lorentz force, resulting in a high-cost configuration and securing an arrangement space. It becomes difficult.
さらにまた、永久磁石からの磁力線を永久磁石の対向面より外側でも形成させるため、磁気ヨークを用いることがあるが、永久磁石からの磁力線によって生じるローレンツ力は、電流の向きが変わると逆方向に作用するため、この場合では逆接接続すると遮断が困難となり事故の原因となる。この事故を避けるためには、電流の向きが逆転してアークが逆方向に動いても十分に伸長できるアーク伸長空間と磁気ヨークを搭載しなければならず、開閉装置が大形化する問題があった。
この発明は、上記のような問題点を解決するためになされたものであり、電流の向きに依らず小形磁石を用いた場合でも十分な遮断信頼性を確保できる開閉装置を得ることを目的としている。 In addition, for arcs located at locations that do not oppose the magnetic pole surface of the permanent magnet, the magnetic lines of force generated from the permanent magnet cause an unexpected Lorentz force, which reduces the reliability of interruption, and in the worst case It will cause an accident that cannot be shut off. In a conventional switchgear equipped with a permanent magnet, the arc is almost always extended to the outside of the opposing surface of the permanent magnet, and such a switchgear is poor in reliability of interruption.
Furthermore, a magnetic yoke is sometimes used to form the magnetic lines of force from the permanent magnet outside the opposing surface of the permanent magnet, but the Lorentz force generated by the magnetic lines of force from the permanent magnet reverses when the current direction changes. In this case, the reverse connection makes it difficult to cut off and causes an accident. In order to avoid this accident, it is necessary to install an arc extension space and a magnetic yoke that can sufficiently extend even if the direction of the current is reversed and the arc moves in the opposite direction, and the size of the switchgear is increased. there were.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a switchgear that can ensure sufficient shutoff reliability even when a small magnet is used regardless of the direction of current. Yes.
以下、図面に基づいてこの発明の実施の形態1について説明する。なお、各図面において、同一符号は同一あるいは相当部分を示す。
図1は、この発明の実施の形態1における開閉装置の開極状態を概略的に示す側断面図である。また、図2は、図1のA-A´線の断面図である。この発明の実施の形態1における開閉装置100は、図1に示すように、固定接点1aを有する固定接触子1と、可動接点2aを有する可動接触子2と、固定接点1aと可動接点2aとの開閉動作を行う開閉機構部103とを備えている。また、開閉装置100は、固定接点1aと可動接点2aとの開離時に、固定接触子1と可動接触子2間で発生したアークAを伸長させるための磁界を発生させる磁石4を備えている。さらにまた、開閉装置100は、一端部が固定接触子1と可動接触子2との間のアーク発生領域20に近接するように配置されると共に、他端部が磁石4の一方の磁極面に接するように配置された長尺状の磁性体からなる吸引棒3を備えている。磁石4は、アーク発生領域20以外の領域に配置されている。また、開閉装置100は、磁石4と長尺状の磁性体からなる吸引棒3とを保護する絶縁カバー3cを備えている。絶縁カバー3cは、例えばナイロン等の樹脂材料で形成されている。ここで、アーク発生領域20とは、図1における点線で囲った固定接触子1と可動接触子2間の空間を示す。
1 is a side cross-sectional view schematically showing an opening state of a switchgear according to
なお、長尺状の磁性体からなる吸引棒3は、丸棒、または直方体、または円筒形、または多角形状の棒などの形態を用いても同様の効果が得られる。また、長尺状の磁性体からなる吸引棒3は、後述するように、紙面手前に通電方向を持つアークAの発生領域に対向するように設けた磁性体用の絶縁カバー3cで保護されている。磁石4には、後述する磁気補強板6が取り付けられている。 As described above, in the
It should be noted that the same effect can be obtained even if the attracting
図3において、まず、消弧の進展段階である図3Aにおいては、永久磁石41から発生する磁力線Mが吸引棒3により誘導され、吸引棒3の先端からアークに向かって、アークへの鎖交磁場が発生するようになる。鎖交磁場によりアークにローレンツ力が作用し、アークは図3Aの下側方向に駆動される。図3Aにおいて、符号8はアーク及びその電流方向を示し、符号9はローレンツ力の作用方向を示す。 FIG. 3 is an explanatory diagram for explaining an arc extinguishing operation of the switchgear according to
In FIG. 3, first, in FIG. 3A, which is a progressing stage of arc extinction, the magnetic field lines M generated from the
次に、消弧の進展段階である図3Cにおいて、アーク伸長空間21に引きこまれたアークは、吸引棒3の側面から法線上に発生する磁力線Mにより更に奥まで引きこまれる。アークは奥に引きこまれるほど、吸引棒3の側面から発生する磁場強度が高まるため、アークは吸引棒3からの脱離が困難となり、安定してアークを吸引棒3の奥側(右側)に伸長させることができる。また、奥に引きこまれたアークに鎖交する磁力線には、永久磁石41のS極側に回り込む磁力線が多く含まれるようになり、この向き(図の右側方向)の磁力線による鎖交磁場はアークを吸引棒3の内側に引き寄せる力を引き起す。 Next, in FIG. 3B, which is an arc extinguishing progress stage, the magnetic field lines M formed so as to wrap around the arc driven at the stage of FIG. 3A from the tip of the attracting
Next, in FIG. 3C, which is the arc extinguishing progress stage, the arc drawn into the
最後に、消弧の進展段階である図3Eにおいて、磁性体用の絶縁カバー3cの一部に図3に示すような凹状の細隙3eを設けた場合には、吸引棒3の内側に押し込むローレンツ力により細隙3e内にアークが引き込まれアークが細く収縮するようになる。更に収縮したアークの周囲から磁性体用の絶縁カバー3cによる溶発ガスが吹き付けられ、アーク内部でその導電性を維持できなくなるまで抵抗が高まり、消弧に至る。 Next, in FIG. 3D, which is a progress stage of arc extinction, Lorentz force that pushes into the inside of the
Finally, in FIG. 3E, which is an advanced stage of arc extinction, when a
このように、吸引棒3と永久磁石41(又は磁石4)を用いることでアークを同一方向に駆動、伸長することができるようになり、開閉装置100を大形化することなく、遮断の信頼性を高めることができる。 According to the above structure, the same effect can be obtained even when the energization direction is reversed. In each arc extinguishing stage, the arc extends so as to be symmetric with respect to the axis of the
In this way, by using the
まず、開閉装置100はアーク伸長空間21を備えており、永久磁石41(又は磁石4)をアーク伸長空間21に配置することで、アークを伸長できる長さを拡張でき、アーク抵抗をさらに高めることができる。
また、永久磁石41(又は磁石4)の吸引棒3と隣接して(接して配置されて)いない反対側(反吸引棒側)磁極面に、磁性体からなる磁気補強板6を設けることで、吸引棒3を介して永久磁石41(又は磁石4)の周囲を周回する磁力線が形成する磁気回路の磁気抵抗が低下するため、吸引棒3の表面から発生する磁場強度が高まり、消弧性能をさらに高めることができる。 Moreover, in this
First, the
Further, by providing a magnetic reinforcing
さらにまた、この発明の実施の形態1においては、磁石4を永久磁石41で構成することで、アークに一定磁束を作用することができるため、通電導体から発生する磁束が弱い電流領域(例えば1kA未満)でも安定した遮断を行うことができる。
また、上記の消弧原理の説明では、使用する磁石として永久磁石41を使用したが、接触子の一方と、または外部電源と、の何れかと電気的に接続されたコイル状の導体を吸引棒3の周囲の一部に巻き付けて、吸引棒3の一部を電磁石(図示せず)として構成しても、上記と同様の現象によりアークを消弧することができる。 As shown in FIG. 2, in the first embodiment, the insulating
Furthermore, in
In the above description of the arc extinguishing principle, the
以上のように、この発明の基本構成を採用することにより、通電方向に関係なく発生したアークAを吸引棒3の奥に引き込み、アークを伸長し、その後冷却して消弧することができる。つまり、電流の向きに依らず永久磁石配置方向にアークを伸長・冷却できるため、電流が逆流した場合でも遮断信頼性を確保できるとともに開閉装置100を小形化できる。また、絶縁カバー3cにより形成した隔離壁により、アークの他方のアーク伸長空間21への周りこみを防止し、遮断性能を安定化できる。 When the
As described above, by adopting the basic configuration of the present invention, the arc A generated regardless of the energization direction can be drawn into the back of the
図4は、この発明の実施の形態2における開閉装置の開極状態を示す側断面図である。実施の形態1では、長尺状の磁性体からなる吸引棒3で形成しているが、実施の形態2では、図4に示すように、吸引棒3の形状を、通電方向により異なる2箇所のアークの伸長先の空間を隔てるように拡大させて配置している。これにより、吸引棒3における磁石4と接する面付近の磁気飽和を抑制できるようになり、接点間で発生するアークを効率よくアーク伸長空間21に引き込めるようになる。さらに、吸引棒3の拡大に伴って、アーク伸長空間21内の磁場強度が高くなる領域も拡張されるため、上記アークの伸長状態を維持しやすくなり遮断信頼性が向上する。
FIG. 4 is a side cross-sectional view showing the opening state of the switchgear according to
図5は、この発明の実施の形態3における開閉装置の開極状態を示す側断面図である。また、図6は、図5のA-A´線における断面図である。図5に示すように、実施の形態3においては、絶縁カバー3cにより、アークの通電方向が異なる2箇所のアーク伸長空間21を隔離する壁を形成したことに加えて、伸長時のアークを取り囲むように絶縁カバー3cを配置している。一般的に、開閉装置100のケース101は、発生したアーク熱に曝された場合でも損耗しないように溶発しにくい材料が選定されるため、アークへの溶発ガスの吹付け効率は低い。
この発明の実施の形態3によれば、溶発しやすい材料で絶縁カバー3cを成形できるため、伸長時のアークを絶縁カバー3cで取り囲むように配置することで、アークへの溶発ガスの吹付け効率を改善でき、遮断信頼性を高めることができる。なお、実施の形態3は、実施の形態2の吸引棒3の形状と組み合わせても良く、組み合わせによりさらに遮断信頼性が向上する。
FIG. 5 is a side sectional view showing an open state of the switchgear according to
According to the third embodiment of the present invention, the insulating
図7は、この発明の実施の形態4における開閉装置の開極状態を示す側断面図である。また、図8は、図7のA-A´線における断面図である。図7および図8に示すように、実施の形態4においては、絶縁カバー3cにより、アークの通電方向が異なる2箇所のアーク伸長空間21を隔離する壁を形成したことに加えて、伸長時のアークが衝突または圧縮できるように、アークの中央部(アーク伸長空間21の中央部)に突起部7を設けている。突起部7は、絶縁カバー3cと同じ材料であり、ケース101の側面に対して突出した形状である。
この発明の実施の形態4によれば、突起部7でアークが衝突または圧縮すると共に突起部7の周囲でアークが引き伸ばされ、アークの冷却効率をさらに改善できるようになる。
なお、この発明は、その発明の範囲内において、各実施の形態を自由に組み合わせたり、各実施の形態を適宜、変形、省略することが可能である。
FIG. 7 is a side sectional view showing an open state of the switchgear according to
According to the fourth embodiment of the present invention, the arc collides or compresses at the projecting
It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.
Claims (5)
- 固定接点を有する固定接触子と、
前記固定接触子に対向して設置され、可動接点を有する可動接触子と、
前記固定接点と前記可動接点との開閉動作を行う開閉機構部と、
前記固定接点と前記可動接点との開離時に、前記固定接触子と前記可動接触子間で発生したアークを伸長させるための磁界を発生させる磁石と、
一端部が前記固定接触子と前記可動接触子との間のアーク発生領域に近接するように配置されると共に、他端部が前記磁石の一方の磁極面に接するように配置された磁性体と、
前記磁石と前記磁性体とを保護すると共に、前記アークの通電方向が異なるアーク伸長空間を隔離する絶縁カバーと、を備え、
前記磁石は、前記アーク発生領域以外の領域に配置されていることを特徴とする開閉装置。 A stationary contact having a stationary contact;
A movable contact that is installed opposite the fixed contact and has a movable contact;
An opening / closing mechanism for performing an opening / closing operation between the fixed contact and the movable contact;
A magnet that generates a magnetic field for extending an arc generated between the fixed contact and the movable contact when the fixed contact and the movable contact are separated;
A magnetic body disposed so that one end thereof is close to an arc generation region between the fixed contact and the movable contact, and the other end is in contact with one magnetic pole surface of the magnet; ,
An insulating cover that protects the magnet and the magnetic body, and that separates arc extension spaces in which the arc energization directions are different, and
The magnet is arranged in a region other than the arc generation region. - 前記磁性体は、前記アークの通電方向が異なる前記アーク伸長空間を隔てるように、前記他端部が拡大されていることを特徴とする請求項1に記載の開閉装置。 2. The switchgear according to claim 1, wherein the other end portion of the magnetic body is enlarged so as to separate the arc extension spaces in which the direction of energization of the arc is different.
- 前記絶縁カバーは、伸長時の前記アークを取り囲むように配置されていることを特徴とする請求項1または請求項2に記載の開閉装置。 The switchgear according to claim 1 or 2, wherein the insulating cover is disposed so as to surround the arc when extended.
- 前記絶縁カバーは、伸長時の前記アークが衝突または圧縮できるように、前記アークの中央部に突起部を設けていることを特徴とする請求項1から請求項3のいずれか1項に記載の開閉装置。 The said insulating cover is provided with the projection part in the center part of the said arc so that the said arc at the time of expansion | extension can collide or compress, The Claim 1 characterized by the above-mentioned. Switchgear.
- 前記絶縁カバーは、樹脂材料であることを特徴とする請求項1から請求項4のいずれか1項に記載の開閉装置。 The switchgear according to any one of claims 1 to 4, wherein the insulating cover is made of a resin material.
Priority Applications (4)
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KR1020167036078A KR101829574B1 (en) | 2014-08-18 | 2015-04-07 | Switching device |
JP2015538779A JP5940225B1 (en) | 2014-08-18 | 2015-04-07 | Switchgear |
EP15833654.5A EP3185270B1 (en) | 2014-08-18 | 2015-04-07 | Switching device |
CN201580044359.1A CN106663556B (en) | 2014-08-18 | 2015-04-07 | Opening and closing device |
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JP (1) | JP5940225B1 (en) |
KR (1) | KR101829574B1 (en) |
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Citations (2)
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JPS62287533A (en) * | 1986-06-06 | 1987-12-14 | 三菱電機株式会社 | Switch |
WO2010150390A1 (en) * | 2009-06-25 | 2010-12-29 | 三菱電機株式会社 | Gas insulated switchgear |
Family Cites Families (9)
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DE3789165T2 (en) * | 1986-06-06 | 1994-10-06 | Mitsubishi Electric Corp | Switchgear. |
JP3166890B2 (en) * | 1994-05-24 | 2001-05-14 | 富士電機株式会社 | Circuit breaker arc extinguishing device |
JP5202072B2 (en) | 2007-09-14 | 2013-06-05 | 富士通コンポーネント株式会社 | relay |
FR2938969A1 (en) * | 2008-11-21 | 2010-05-28 | Schneider Electric Ind Sas | CUTTING DEVICE FOR CUTTING BIDIRECTIONAL CONTINUOUS CURRENT AND PHOTOVOLTAIC CELL INSTALLATION EQUIPPED WITH SUCH A DEVICE |
JP5710984B2 (en) * | 2011-01-12 | 2015-04-30 | 富士電機株式会社 | Magnetic contactor |
KR101354405B1 (en) | 2011-06-07 | 2014-01-22 | 후지쯔 콤포넌트 가부시끼가이샤 | Electromagnetic relay and manufacturing method therefor |
EP2980821B1 (en) * | 2013-03-27 | 2019-05-15 | Mitsubishi Electric Corporation | Switchgear |
CN104078257B (en) * | 2013-03-27 | 2017-04-12 | 三菱电机株式会社 | Switchgear |
US9343251B2 (en) * | 2013-10-30 | 2016-05-17 | Eaton Corporation | Bi-directional direct current electrical switching apparatus including small permanent magnets on ferromagnetic side members and one set of arc splitter plates |
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JPS62287533A (en) * | 1986-06-06 | 1987-12-14 | 三菱電機株式会社 | Switch |
WO2010150390A1 (en) * | 2009-06-25 | 2010-12-29 | 三菱電機株式会社 | Gas insulated switchgear |
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CN106663556B (en) | 2019-08-30 |
KR101829574B1 (en) | 2018-02-14 |
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KR20170007820A (en) | 2017-01-20 |
EP3185270B1 (en) | 2024-02-14 |
JPWO2016027499A1 (en) | 2017-04-27 |
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CN106663556A (en) | 2017-05-10 |
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