JP2017022029A - Arc horn and distribution panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arc horn capable of easily and accurately guiding an arc to a distal end of a tip of the arc horn which is fitted at a load side with respect to an arc generation place even when driving either an edge portion of a power supply conductor at an arc horn fitting side or an edge portion of a power supply conductor at an opposite side of the arc horn fitting side by a leg of the arc if the arc is generated between neighboring power supply conductors, and a distribution panel.SOLUTION: An arc horn 20 comprises: a fitting part 21 which is fitted to one face 91 of a power supply conductor 9; and a conductive arc drive part 22 which is fitted to the fitting part 21. The arc drive part 22 includes: an inclined part 23 extending from the fitting part 21 so as to be inclined relatively to the one face 91 of the power supply conductor 9; and a pair of extension parts 24 and 24 which extend from the inclined part 23 and cover both an edge portion 91a of a power supply conductor 9 at a fitting side of the fitting part 21 and an edge portion 92a of the power supply conductor 9 at an opposite side of the fitting side of the fitting part 21 from both lateral sides of the power supply conductor 9.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an arc horn for stagnating an arc generated between adjacent power supply conductors in the middle of an arc drive path, and a switchboard equipped with the arc horn.

  In the switchboard, when a short circuit occurs between adjacent power supply conductors, an arc is generated between the adjacent power supply conductors. In this case, the arc is driven by the influence of electromagnetic force (Lorentz force) in the direction opposite to the power source side (load side) by the magnetic field generated by the current flowing in the arc and the current flowing in the power supply conductor. At that time, the arc damages and burns the surrounding electrical equipment with the generated energy, and if the arc touches the switchboard casing, the casing is damaged, and high-temperature gas flows from the switchboard to the outside of the switchboard. May cause serious accidents. Therefore, it is desired to control and calm this arc, and in the switchboard, an arc horn (auxiliary conductor) is provided on the power supply conductor in order to stagnate the arc generated between adjacent power supply conductors in the middle of the arc drive path. Proposed.

As a conventional switchboard equipped with this type of arc horn, for example, the one shown in Patent Document 1 is known.
In the switchboard shown in Patent Document 1, an arc horn (auxiliary conductor) is attached to each of the three-phase power branch conductors from the power source. Each arc horn is arranged correspondingly through a space, and each tip is inclined from the power supply side toward the load side. The arc generated between adjacent power supply branch conductors is driven by the electromagnetic force from one point close to the power supply side to the tip of the arc horn and stagnates, and the surrounding electrical equipment is prevented from being damaged by the arc. Can do.

JP-A-6-38315

However, the switchboard shown in Patent Document 1 has the following problems.
That is, in the switchboard shown in Patent Document 1, the power branch conductor to which the arc horn is attached is configured by a flat plate having a rectangular cross section, and the arc horn is attached to one surface of the flat plate. On the other hand, an arc foot (cathode spot, anode spot) generated between adjacent flat power supply conductors travels on the edge portion of the conductor where the electric field concentrates when driving. For this reason, when the leg of the arc travels on the edge portion of the power branch conductor on the arc horn mounting side, the arc is guided to the arc horn and stagnates at the tip. On the other hand, when the arc leg travels on the edge portion of the power branch conductor on the side opposite to the arc horn mounting side, the arc is not guided to the arc horn and the drive to the load side of the power branch conductor is continued. As a result, the surrounding electrical equipment may be damaged by the arc.

  Therefore, the present invention has been made to solve this conventional problem. The purpose of the present invention is to provide a power conductor on the arc horn mounting side when an arc is generated between adjacent power conductors. When driving either the edge portion of the power supply or the edge portion of the power supply conductor opposite to the arc horn mounting side, the arc can be easily and reliably guided to the tip of the arc horn mounted on the load side with respect to the arc generation location. The object is to provide an arc horn and a switchboard that can.

In order to achieve the above object, an arc horn according to one aspect of the present invention is an arc generated between adjacent power supply conductors that is attached to one surface of each of a plurality of power supply conductors configured by a flat plate having a rectangular cross section. An arc horn that stagnates in the middle of the arc drive path, and includes an attachment portion attached to one surface of the power supply conductor, and a conductive arc drive portion attached to the attachment portion. An inclined portion extending so as to be inclined with respect to one surface of the power supply conductor from the attachment portion, an edge portion of the power supply conductor on the side where the attachment portion is attached and the side opposite to the side on which the attachment portion is attached And a pair of extensions that cover both edge portions of the power supply conductor from both sides of the power supply conductor.
Further, a switchboard according to another aspect of the present invention includes a plurality of power supply conductors configured by flat plates having a rectangular cross section, and the arc horn described above attached to one surface of each of the plurality of power supply conductors. Is the gist.

  According to the arc horn and the switchboard according to the present invention, when an arc is generated between the adjacent power conductors, the arc foot is the power source edge portion on the arc horn mounting side and the power source on the side opposite to the arc horn mounting side. When driving any of the conductor edge portions, it is possible to provide an arc horn and a switchboard that can easily and surely guide the arc to the tip of the arc horn attached to the load side with respect to the arc generation location.

It is a schematic explanatory drawing of the switchboard provided with the arc horn which concerns on 1st Embodiment of this invention. It is a right view of the arc horn which concerns on 1st Embodiment of this invention. It is the perspective view seen from the front diagonally upper direction of the arc horn shown in FIG. It is a perspective view of the state which attached the arc horn shown in FIG. 2 to the power supply conductor. It is a figure which shows schematically the positional relationship of what attached the arc horn shown in FIG. 2 to each of two adjacent power supply conductors, and the housing | casing of a switchboard. In the figure schematically shown in FIG. 5, it is a figure for demonstrating the drive of an arc. However, in FIG. 6, only the power supply conductor and arc horn of one side are shown among two adjacent power supply conductors and the arc horn attached to them. It is a right view of the arc horn which concerns on 2nd Embodiment of this invention. It is the perspective view seen from the front diagonally upper direction of the arc horn shown in FIG. It is a perspective view of the state which attached the arc horn shown in FIG. 7 to the power supply conductor. It is a figure which shows roughly the positional relationship of what attached the arc horn shown in FIG. 7 to each of two adjacent power supply conductors, and the housing | casing of a switchboard. In the figure schematically shown in FIG. 10, it is a figure for demonstrating the drive of an arc. However, in FIG. 11, only one side power supply conductor and arc horn are shown among two adjacent power supply conductors and the arc horn attached to them. It is a perspective view of the state which attached the arc horn of the reference example to the power supply conductor. It is a figure which shows roughly the positional relationship of what attached the arc horn shown in FIG. 12 to each of two adjacent power supply conductors, and the housing | casing of a switchboard. In the figure schematically shown in FIG. 13, it is a figure for demonstrating the case where an arc drives the edge part of the power supply conductor of the side which attached the arc horn. However, in FIG. 14, only one of the two power supply conductors and the arc horn attached thereto are shown. In the figure schematically shown in FIG. 13, it is a figure for demonstrating the case where an arc drives the edge part of the power supply conductor on the opposite side to the side which attached the arc horn. However, in FIG. 15, only one side power supply conductor and arc horn are shown among two adjacent power supply conductors and the arc horn attached to them.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
The arc horn according to the first embodiment of the present invention is provided in the switchboard shown in FIG. The switchboard 1 includes a circuit breaker chamber A, a busbar chamber B, and a cable chamber C by attaching partition plates 2A and 2B to the inside of the housing 1a. Three insulators 4a, 4b, and 4c are attached to the partition plate 2A on the ceiling side of the bus bar room B, and each of the insulators 4a, 4b, and 4c has power supply conductors 3a, 3b, and 3c for each phase constituting three phases. Is attached. The power supply branch conductor 5 is connected to the power supply conductors 3a, 3b, and 3c of each phase. Each power supply branch conductor 5 is connected to each power supply side disconnect part 6 attached to the partition plate 2A. Moreover, the three load side disconnection parts 8 are attached to the partition plate 2A. A vacuum circuit breaker 7 is arranged in the circuit breaker chamber A, and the vacuum circuit breaker 7 moves in the circuit breaker chamber A and electrically opens and closes with each power supply side disconnection part 6 and each load side disconnection part 8. .

  A power supply conductor 9 is connected to each of the three load-side disconnecting portions 8. The three power supply conductors 9 are arranged in parallel in the cable chamber C, and each power supply conductor 9 is attached to a plurality of insulators 10 attached to the partition plate 2B, and penetrates the current transformer 11 and passes through the cable 12. Connected to. The cable 12 is drawn out of the switchboard 1 from the cable chamber C and connected to a load such as a motor. Here, after each power supply conductor 9 extends horizontally from the load-side disconnecting portion 8, it extends upward via the first bent portion 9a, and further extends horizontally toward the housing 1a via the second bent portion 9b. And the arc horn 20 is attached to the horizontal part of the power supply conductor 9 near the first bent part 9a and the horizontal part of the second bent part 9b, respectively.

Each power supply conductor 9 can be grounded via a bus bar 14 via an earthing switch 13.
Here, the arc horn 20 attached to the horizontal portion near the first bent portion 9a of each power supply conductor 9 and the arc horn 20 attached to the horizontal portion near the second bent portion 9b of each power supply conductor 9 are configured. Since they are the same, the arc horn 20 attached to the horizontal portion in the vicinity of the second bent portion 9b of each power supply conductor 9 will be described hereinafter.
This arc horn 20 stagnates the arc generated between the adjacent power supply conductors 9 in the middle of the arc drive path, and as shown in FIGS. 4 and 5, is one side (upper surface in FIGS. 4 and 5). 91 and a plurality of flat plates having a rectangular cross section having the other surface (lower surface) 92 opposite to the one surface (three in this embodiment, one in FIG. 4 and only two in FIG. 5) Are attached to one surface 91 of each of the power supply conductors 9 shown in the figure.

As shown in FIGS. 2 to 4, each arc horn 20 includes a mounting portion 21 attached to one surface 91 of each power supply conductor 9 and a conductive arc drive portion 22 attached to the mounting portion 21. .
Here, the attachment portion 21 includes a rectangular substrate portion 21a having a width slightly narrower than the width of the power supply conductor 9, and a rectangular narrow width extending from the short side of the substrate portion 21a and narrower than the substrate portion 21a. It is a board member which has the board part 21b. The attachment portion 21 is integrally formed by processing a metal plate. A plurality of bolt insertion holes 21d through which the screw shafts of the mounting bolts 27 for mounting the mounting portion 21 to the power supply conductor 9 pass vertically penetrate the substrate portion 21a and the narrow plate portion 21b of the mounting portion 21. It is formed to do. The attachment portion 21 is attached to one surface 91 of the power supply conductor 9 so that the substrate portion 21a is on the power supply side and the narrow plate portion 21b is on the load side.

  The arc driving unit 22 includes an inclined portion 23 that extends from the mounting portion 21 so as to be inclined with respect to the one surface 91 of the power supply conductor 9. The inclined portion 23 is joined to the one surface 91 of the power supply conductor 9, that is, the upper surface of the attachment portion 21 by joining at the load side end portion of the substrate portion 21 a protruding in the width direction from the narrow plate portion 21 b of the attachment portion 21. It extends to incline with respect to it. The inclination of the inclined portion 23 with respect to the one surface 91 of the power supply conductor 9 and the upper surface of the mounting portion 21 is an inclination such that the load side rises, and the inclination angle is set to about 45 °. The inclined portion 23 is joined at the rectangular inclined portion main body 23a and the rear end portion of the substrate portion 21a that extends from both ends in the width direction of the inclined portion main body 23a and protrudes in the width direction from the narrow plate portion 21b of the mounting portion 21. A pair of leg portions 23b and 23c joined at 21c.

  Further, the arc drive unit 22 has a pair of extensions 24, 24 extending in the direction (downward) perpendicular to the one surface 91 of the power conductor 9 from the ends of the pair of legs 23b, 23c of the inclined portion 23 (FIG. 2). In FIG. 5 to FIG. 5, only one extension 24 is shown). As shown in FIG. 4, the pair of extension portions 24 and 24 are formed by the edge portion 91 a of the power supply conductor 9 on the side where the mounting portion 21 is attached and the edge portion 92 a of the power supply conductor 9 on the side opposite to the side where the mounting portion 21 is attached. Both sides are covered from both sides of the power supply conductor 9. In the example shown in FIGS. 2 to 5, a pair of notches 93 through which the pair of extension portions 24, 24 are passed is formed on both side surfaces of each power supply conductor 9. Both the edge portion 91aa of the notch 93 on the side where the attachment portion 21 is attached and the edge portion 92aa of the notch 93 on the side opposite to the side where the attachment portion 21 is attached are covered.

Moreover, in the arc drive part 22, a pair of extension parts 24 and 24 are connected by the connection part 26 which covers the other surface 92 of the power supply conductor 9 on the opposite side to the side which attaches the attachment part 21 in those edge parts. .
Further, an edge portion 25 for driving the arc 100 (see FIG. 6) is provided on the side surfaces of the inclined portion 23 and the pair of extension portions 24 and 24 of the arc driving portion 22. The edge portion 25 extends from the end portion (lower end portion) of each extension portion 24 to the end portion (upper end portion) of the inclined portion 23.
When the arc horn 20 configured in this way is attached to the power supply conductor 9, the power supply conductor 9 is inserted into the gap between the connecting portion 26 of the arc horn 20 and the attachment portion 21 from the load side end of the power supply conductor 9. In this manner, the arc horn 20 is slid so that the pair of extension portions 24 and 24 are positioned at the notches 93, and the attachment portion 21 and the power supply conductor 9 are clamped by the attachment bolts 27 and the nuts 28. At this time, the attachment portion 21 is attached to the one surface 91 of the power supply conductor 9 such that the substrate portion 21a is on the power supply side and the narrow plate portion 21b is on the load side. Although not shown, the power supply conductor 9 is formed with a through hole through which the mounting bolt 27 is inserted.

Next, the action of the arc horn 20 attached to the power supply conductor 9 will be described with reference to FIG.
In the switchboard 1, when a short circuit occurs between the adjacent power supply conductors 9, an arc 100 is generated between the adjacent power supply conductors 9. In this case, the arc 100 is driven by the influence of electromagnetic force (Lorentz force) in the direction opposite to the power source side (load side) by the magnetic field generated by the current flowing in the arc 100 and the current flowing in the power supply conductor 9.
Here, when the arc 100 drives the edge portion 92 a of the power supply conductor 9 on the side opposite to the side on which the attachment portion 21 is attached, the legs (anode point and cathode point) of the arc 100 are the edge portions on the power supply side of the power supply conductor 9. The arc drive path A of the extension part 24 and the inclined part 23 of the arc horn 20 is driven through the edge part 92aa of the notch 93 from 92a to reach the tip of the inclined part 23, and the leg of the arc 100 is one end of the tip of the inclined part 23. It is fixed to the part 23A. Then, the arc 100 gradually spreads to the tip other end 23B side of the inclined portion 23 opposite to the tip one end 23A, and the leg is fixed to the tip other end 23B. For this reason, the arc 100 does not come into contact with the housing 1a, and it is possible to avoid the possibility that the housing 1a is damaged and high-temperature gas is released from the inside of the switchboard 1 to the outside of the switchboard 1. Note that the mounting position of the arc horn 20 with respect to the power supply conductor 9 is set to a position that does not reach the housing 1a even when the arc 100 spreads.

  On the other hand, when the arc 100 drives the edge portion 91 a of the power supply conductor 9 on the side where the mounting portion 21 is attached, the leg of the arc 100 is not formed from the edge portion 91 a of the power supply conductor 9 on the power supply side. The arc drive path of the extension part 24 and the inclined part 23 of the arc horn 20 is driven through the edge part 91aa to reach the tip of the inclined part 23, and the leg of the arc 100 is fixed to the one end part 23A of the inclined part 23. Then, the arc 100 gradually spreads to the tip other end 23B side of the inclined portion 23 opposite to the tip one end 23A, and the leg is fixed to the tip other end 23B. For this reason, the arc 100 does not contact the housing 1a.

  As described above, according to the arc horn 20 according to the first embodiment, the arc driving unit 22 includes the inclined portion 23 extending from the mounting portion 21 so as to be inclined with respect to the one surface 91 of the power supply conductor 9, and the inclined portion 23. Both the edge portion 91a (91aa) of the power supply conductor 9 on the side where the attachment portion 21 is attached and the edge portion 92a (92aa) of the power supply conductor 9 on the opposite side to the attachment portion 21 are attached from both sides of the power supply conductor 9. A pair of extending portions 24, 24 are provided. For this reason, when the arc 100 is generated between the adjacent power supply conductors 9, the legs of the arc 100 are the power supply on the side opposite to the side on which the edge portion 91 a of the power supply conductor 9 to which the arc horn 20 is attached and the arc horn 20 is attached. When driving any of the edge portions 92a of the conductor 9, the inclined portion 23 is driven from the extension portion 24 of the arc horn 20 to reach the tip of the inclined portion 23, so that the arc 100 is placed on the load side with respect to the arc generation location. The tip of the attached arc horn 20 can be easily and surely guided, the arc 100 does not contact the housing 1a, the housing 1a is damaged, and high temperature gas may be released from the inside of the switchboard 1 to the outside of the switchboard 1. Can be avoided.

Further, according to the arc horn 20 according to the first embodiment, the pair of extension portions 24 and 24 are connected by the connection portion 26 that covers the other surface 92 of the power supply conductor 9 on the side opposite to the side on which the attachment portion 21 is attached. Yes. Therefore, even when the leg of the arc 100 drives the other surface 92 side of the power supply conductor 9, the leg of the arc 100 drives the extension part 24 and the inclined part 23 from the connecting part 26 to the tip of the inclined part 23. Therefore, the arc 100 can be easily and reliably guided to the tip of the arc horn 20.
Furthermore, according to the arc horn 20 according to the first embodiment, the edge portion 25 that drives the arc 100 is provided on the side surfaces of the inclined portion 23 and the pair of extension portions 24, 24 of the arc driving portion 22. For this reason, when the leg of the arc 100 drives the inclined part 23 from the extension part 24 of the arc horn 20 to the tip of the inclined part 23, the leg of the arc 100 drives on the edge part 25. Thereby, the arc 100 can be easily guided by the tip of the arc horn 20.

  Moreover, according to the switchboard 1 provided with the arc horn 20 which concerns on 1st Embodiment, a pair of extension parts 24 and 24 are passed through each side surface of each of the plurality (three in this embodiment) of power supply conductors 9. A pair of notches 93, 93 is formed. The reason for this is that when the edge portions 91a and 92a are covered with a pair of extension portions 24, 24 from both side surfaces of the straight-shaped power supply conductor 9 in which the notch 93 is not formed, the power supply conductors arranged in parallel adjacent to each other. There is a concern that the distance between the arc horn 20 attached to 9 and the extension 24 of the arc horn 20 is shortened, and the withstand voltage between the electrodes is reduced. Therefore, a notch 93 serving as a relief for the extension 24 is formed in the power supply conductor 9 in the vicinity where the extension 24 of the arc horn 20 is installed. Thereby, it becomes possible to maintain the insulation distance between poles and to prevent the withstand voltage from decreasing. Thus, if the notch 93 is formed in the power supply conductor 9, the cross-sectional area of the power supply conductor 9 of the part will become small, and there exists a concern about the danger of generating heat | fever by current concentration. However, since the portion including the extension 24 of the arc horn 20 can also be used as a conductor, the sum of the cross-sectional area of the arc horn 20 and the cross-sectional area of the power source conductor 9 where the notch 93 is present is a straight-shaped power source. If it is larger than the cross-sectional area of the conductor 9, current concentration can be prevented.

Next, a reference example in which the arc horn 20 is not provided with the pair of extensions 24, 24 will be described with reference to FIGS. 12 to 15, the same members as those in FIGS. 2 to 6 are denoted by the same reference numerals, and the description thereof may be omitted.
The arc horn 20 shown in FIG. 12 to FIG. 15 is similar to the arc horn 20 shown in FIG. 2 to FIG. 6, the mounting portion 21 attached to one surface 91 of each power supply conductor 9, and the arc drive attached to the mounting portion 21. Part 22. The arc horn 20 is integrally formed by processing a conductive metal plate.

  Here, the attachment portion 21 is a plate member formed in a rectangular shape having substantially the same width as the power supply conductor 9, and the screw shaft of the attachment bolt 27 for attaching the attachment portion 21 to the power supply conductor 9 is inserted. A plurality of bolt insertion holes (not shown) are formed so as to penetrate vertically. When the arc horn 20 is attached to the one surface 91 of the power supply conductor 9, the attachment portion 21 is placed on the one surface 91 of the power supply conductor 9, and the attachment portion 21 and the power supply conductor 9 are clamped by a plurality of attachment bolts 27 and nuts 28. do it. Although not shown, the power supply conductor 9 is formed with a through hole through which the mounting bolt 27 is inserted.

The arc driving unit 22 includes an inclined portion 23 that extends from the mounting portion 21 so as to be inclined with respect to the one surface 91 of the power supply conductor 9. The inclined part 23 is a substantially rectangular plate member and is formed integrally with the mounting part 21. And the inclination with respect to the one surface 91 of the power supply conductor 9 of the power supply conductor 9 and the upper surface of the attachment part 21 is an inclination which the load side stands | starts up, and the inclination angle is set to about 45 degrees. Unlike the arc horn 20 of the first embodiment, the arc drive unit 22 is not provided with a pair of extensions.
The operation of the arc horn 20 of the reference example configured as described above will be described with reference to FIGS. 14 and 15.

  First, as shown in FIG. 14, when the arc 100 drives the edge portion 91 a of the power supply conductor 9 on the side where the mounting portion 21 is attached, the legs of the arc 100 are connected to the arc horn from the power supply side edge portion 91 a of the power supply conductor 9. 20, the arc driving path A of the upper edge portion of the inclined portion 23 of the arc horn 20 is driven through the upper edge portion of the mounting portion 21 to reach the tip of the inclined portion 23, and the leg of the arc 100 is one end of the tip of the inclined portion 23. It is fixed to the part 23A. Then, the arc 100 gradually spreads to the tip other end 23B side of the inclined portion 23 opposite to the tip one end 23A, and the leg is fixed to the tip other end 23B. For this reason, the arc 100 does not contact the housing 1a.

  On the other hand, as shown in FIG. 15, when the arc 100 drives the edge portion 92 a of the power supply conductor 9 on the side opposite to the side on which the mounting portion 21 is attached, the leg of the arc 100 is connected to the power supply side edge portion 92 a of the power supply conductor 9. The arc drive path B from the power supply conductor 9 to the end of the load-side edge portion 92 a of the power supply conductor 9 is driven, and the leg of the arc 100 is fixed to the tip end portion 9 A of the power supply conductor 9. Then, the arc 100 gradually spreads toward the other end 23B of the power supply conductor 9 on the side opposite to the one end 9A, and the leg is fixed to the other end 23B. At this time, the arc 100 comes into contact with the housing 1 a, the housing 1 a is damaged, and high-temperature gas is released from the inside of the switchboard 1 to the outside of the switchboard 1.

Thus, in the case of the arc horn 20 of the reference example in which the arc horn 20 is not provided with the pair of extensions 24, 24, the arc 100 drives the edge portion 92a of the power supply conductor 9 on the side opposite to the side on which the mounting portion 21 is attached. In this case, the arc 100 is not guided to the arc horn 20, and the driving of the arc 100 in the power supply conductor 9 is continued, and there is a disadvantage that the arc 100 contacts the casing 1 a.
On the other hand, in the case of the arc horn 20 according to the first embodiment, as described above, the arc driving portion 22 is inclined so as to be inclined with respect to the one surface 91 of the power supply conductor 9 from the mounting portion 21. 23 and both the edge portion 91a (91aa) of the power supply conductor 9 on the side where the attachment portion 21 is attached and the edge portion 92a (92aa) of the power supply conductor 9 on the side opposite to the attachment portion 21 are attached. A pair of extensions 24 and 24 are provided to cover the power supply conductor 9 from both sides. For this reason, when the arc 100 is generated between the adjacent power supply conductors 9, the legs of the arc 100 are the power supply on the side opposite to the side on which the edge portion 91 a of the power supply conductor 9 to which the arc horn 20 is attached and the arc horn 20 is attached. When driving any of the edge portions 92a of the conductor 9, the inclined portion 23 is driven from the extension portion 24 of the arc horn 20 to reach the tip of the inclined portion 23, so that the arc 100 is placed on the load side with respect to the arc generation location. It can be easily and reliably guided to the tip of the attached arc horn 20.

(Second Embodiment)
Next, an arc horn according to a second embodiment of the present invention will be described with reference to FIGS. 7 to 11, the same members as those in FIGS. 2 to 6 are denoted by the same reference numerals, and the description thereof may be omitted.
The arc horn according to the second embodiment is shown in FIG. 7 to FIG. 11, and this arc horn 20 has the same basic configuration as the arc horn 20 shown in FIG. 2 to FIG. The shapes of 24 and 24 are different. Note that the arc horn 20 according to the second embodiment also has a horizontal portion in the vicinity of the first bent portion 9a of each power conductor 9 and a horizontal portion in the vicinity of the second bent portion 9b of each power conductor 9 in the switchboard 1 shown in FIG. Attached to the part.

  Each extension portion 24 has a direction in which the extension portion 24 of the arc horn 20 according to the first embodiment is orthogonal to one surface 91 of the power supply conductor 9 from each of the end portions of the pair of leg portions 23b and 23c of the inclined portion 23 ( It is different in that it extends straight from each of the ends of the pair of leg portions 23b, 23c of the inclined portion 23. As shown in FIG. 9, the pair of extension portions 24 includes both the edge portion 91 a of the power supply conductor 9 on the side where the attachment portion 21 is attached and the edge portion 92 a of the power supply conductor 9 on the side opposite to the side where the attachment portion 21 is attached. Is covered from both sides of the power supply conductor 9. In the example shown in FIGS. 7 to 11, a pair of notches 93 through which the pair of extension portions 24, 24 are passed is formed on both side surfaces of each power supply conductor 9. Both the edge portion 91aa of the notch 93 on the side where the attachment portion 21 is attached and the edge portion 92aa of the notch 93 on the side opposite to the side where the attachment portion 21 is attached are covered.

In addition, in the arc drive part 22 of the arc horn 20 which concerns on 2nd Embodiment, a pair of extension parts 24 and 24 differ from a pair of extension parts 24 and 24 of the arc horn 20 which concerns on 1st Embodiment, and those ends. Are not connected by the connecting portion 26 that covers the other surface 92 of the power supply conductor 9 on the side opposite to the side on which the attaching portion 21 is attached.
Further, similarly to the arc horn 20 according to the first embodiment, the arc 100 (see FIG. 5) is provided on the side surfaces of the inclined portion 23 and the pair of extension portions 24, 24 of the arc drive unit 22 of the arc horn 20 according to the second embodiment. 11) is provided. The edge portion 25 extends from the end portion (lower end portion) of each extension portion 24 to the end portion (upper end portion) of the inclined portion 23.
When the arc horn 20 configured in this way is attached to the power supply conductor 9, the attachment portion 21 is placed on one surface 91 of the power supply conductor 9, so that both the extension portions 24 pass through both notches 93 of the power supply conductor 9. Place. Then, the mounting portion 21 and the power supply conductor 9 may be hugged by the mounting bolt 27 and the nut 28. At this time, the attachment portion 21 is attached to the one surface 91 of the power supply conductor 9 such that the substrate portion 21a is on the power supply side and the narrow plate portion 21b is on the load side. Although not shown, the power supply conductor 9 is formed with a through hole through which the mounting bolt 27 is inserted.

Next, with reference to FIG. 11, the effect | action of the arc horn 20 which concerns on 2nd Embodiment attached to the power supply conductor 9 is demonstrated.
In the switchboard 1, if a short circuit occurs between the adjacent power supply conductors 9, an arc 100 is generated between the adjacent power supply conductors 9. In this case, the arc 100 is driven by the influence of electromagnetic force (Lorentz force) in the direction opposite to the power source side (load side) by the magnetic field generated by the current flowing in the arc 100 and the current flowing in the power supply conductor 9.
Here, when the arc 100 drives the edge portion 92a of the power supply conductor 9 on the side opposite to the side on which the attachment portion 21 is attached, the legs (anode point and cathode point) of the arc 100 are connected to the power supply conductor as shown in FIG. 9 through the edge portion 92aa of the notch 93 through the edge portion 92aa of the notch 93 to drive the arc drive path A of the extended portion 24 and the inclined portion 23 of the arc horn 20 to the tip of the inclined portion 23, and the leg of the arc 100 Is fixed to one end portion 23 </ b> A of the inclined portion 23. Then, the arc 100 gradually spreads to the tip other end 23B side of the inclined portion 23 opposite to the tip one end 23A, and the leg is fixed to the tip other end 23B. For this reason, the arc 100 does not come into contact with the housing 1a, and it is possible to avoid the possibility that the housing 1a is damaged and high-temperature gas is released from the inside of the switchboard 1 to the outside of the switchboard 1. Note that the mounting position of the arc horn 20 with respect to the power supply conductor 9 is set to a position that does not reach the housing 1a even when the arc 100 spreads.

  On the other hand, when the arc 100 drives the edge portion 91 a of the power supply conductor 9 on the side where the mounting portion 21 is attached, the leg of the arc 100 is not formed from the edge portion 91 a of the power supply conductor 9 on the power supply side. The arc drive path of the extension part 24 and the inclined part 23 of the arc horn 20 is driven through the edge part 91aa to reach the tip of the inclined part 23, and the leg of the arc 100 is fixed to the one end part 23A of the inclined part 23. Then, the arc 100 gradually spreads to the tip other end 23B side of the inclined portion 23 opposite to the tip one end 23A, and the leg is fixed to the tip other end 23B. For this reason, the arc 100 does not contact the housing 1a.

  Thus, also in the arc horn 20 according to the second embodiment, the arc driving unit 22 extends from the mounting portion 21 so as to be inclined with respect to the one surface 91 of the power supply conductor 9 and the inclined portion 23. Both the edge portion 91a (91aa) of the power supply conductor 9 on the side where the attachment portion 21 is attached and the edge portion 92a (92aa) of the power supply conductor 9 on the side opposite to the attachment portion 21 are covered from both sides of the power supply conductor 9. A pair of extensions 24, 24 is provided. For this reason, when the arc 100 is generated between the adjacent power supply conductors 9, the legs of the arc 100 are the power supply on the side opposite to the side on which the edge portion 91 a of the power supply conductor 9 to which the arc horn 20 is attached and the arc horn 20 is attached. When driving any of the edge portions 92a of the conductor 9, the inclined portion 23 is driven from the extension portion 24 of the arc horn 20 to reach the tip of the inclined portion 23, so that the arc 100 is placed on the load side with respect to the arc generation location. The tip of the attached arc horn 20 can be easily and surely guided, the arc 100 does not contact the housing 1a, the housing 1a is damaged, and high temperature gas may be released from the inside of the switchboard 1 to the outside of the switchboard 1. Can be avoided.

  Further, according to the arc horn 20 according to the second embodiment, the pair of extension portions 24, 24 extend straight from the ends of the pair of leg portions 23 b, 23 c of the inclined portion 23. That is, each extension 24 itself is also inclined with respect to one surface 91 of the power supply conductor 9 so that the load side is on the upper side. For this reason, even if the leg of the arc 100 drives either the edge portion 91a of the power supply conductor 9 on the side to which the arc horn 20 is attached or the edge portion 92a of the power supply conductor 9 on the side opposite to the side to which the arc horn 20 is attached. It is easy to get on the part 24 and the leg of the arc 100 can be easily driven to reach the tip of the inclined part 23.

Also in the arc horn 20 according to the second embodiment, the edge portion 25 for driving the arc 100 is provided on the side surfaces of the inclined portion 23 and the pair of extension portions 24, 24 of the arc driving portion 22. For this reason, when the leg of the arc 100 drives the inclined part 23 from the extension part 24 of the arc horn 20 to the tip of the inclined part 23, the leg of the arc 100 drives on the edge part 25. Thereby, the arc 100 can be easily guided by the tip of the arc horn 20.
Moreover, also in the switchboard 1 provided with the arc horn 20 according to the second embodiment, a pair of a pair of extension portions 24, 24 is passed through each side surface of a plurality (three in this embodiment) of power supply conductors 9. Notches 93 and 93 are formed. For this reason, it becomes possible to maintain the insulation distance between poles, and it can prevent a withstand voltage fall.

As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change and improvement can be performed.
For example, in both the arc horn 20 according to the first embodiment and the arc horn 20 according to the second embodiment, the attachment portion 21 and the arc driving portion 22 are configured separately and joined to each other. You may comprise 21 and the arc drive part 22 integrally.
Further, in both the arc horn 20 according to the first embodiment and the arc horn 20 according to the second embodiment, the inclined portion 23 has an inclination angle of about 45 ° so that the load side rises with respect to the one surface 91 of the power supply conductor 9. However, the inclination angle is not limited to about 45 ° as long as the load side is inclined with respect to the one surface 91 of the power supply conductor 9.

Further, in both the arc horn 20 according to the first embodiment and the arc horn 20 according to the second embodiment, it is not always necessary to provide the edge portions 25 on the side surfaces of the pair of extension portions 24 and 24 and the inclined portion 23.
Moreover, in the switchboard 1 provided with the arc horn 20 according to the first embodiment and the switchboard 1 provided with the arc horn 20 according to the second embodiment, a pair of notches 93 are formed on both side surfaces of the power supply conductor 9. You don't have to. In this case, the pair of extension portions 24 is configured so that both the edge portion 91a of the power supply conductor 9 on the side where the attachment portion 21 is attached and the edge portion 92a of the power supply conductor 9 on the opposite side to the attachment portion 21 are Cover from the side.

Further, in the arc horn 20 according to the first embodiment, the connecting portion 26 that connects the pair of extension portions 24 and 24 is not necessarily provided.
Moreover, the arc horn 20 according to the first embodiment and the second embodiment is attached to one surface of each of a plurality of power supply conductors configured by a flat plate having a rectangular cross section, and generates an arc generated between adjacent power supply conductors. The stagnation is caused in the middle of the arc drive path, and this may be applied not only to the switchboard 1 but also to, for example, a trunk wiring system called a bus duct system in which a plurality of power supply conductors are used.

DESCRIPTION OF SYMBOLS 1 Switchboard 9 Power supply conductor 20 Arc horn 21 Attachment part 22 Arc drive part 23 Inclination part 24 Extension part 25 Edge part 26 Connection part 91 One surface of a power supply conductor 91a Edge part 91b Edge part 92 Other surface of a power supply conductor 93 Notch 100 Arc

Claims (5)

An arc horn that is attached to one surface of each of a plurality of power supply conductors configured by a flat plate having a rectangular cross section, and stagnates an arc generated between adjacent power supply conductors in the middle of an arc drive path,
An attachment portion attached to one surface of the power supply conductor, and a conductive arc driving portion attached to the attachment portion;
The arc driving portion includes an inclined portion extending from the attachment portion so as to incline with respect to one surface of the power supply conductor, an edge portion of the power supply conductor on the side extending from the inclination portion and attaching the attachment portion, and the attachment portion An arc horn comprising: a pair of extensions that cover both sides of the power supply conductor on both sides of the power supply conductor opposite to the side to which the power supply is attached.   2. The arc horn according to claim 1, wherein the pair of extension portions are connected by a connection portion that covers the other surface of the power supply conductor on the side opposite to the side on which the attachment portion is attached.   The arc horn according to claim 1 or 2, wherein an edge portion for driving the arc is provided on a side surface of the inclined portion and the pair of extension portions of the arc driving portion.   A plurality of power supply conductors constituted by flat plates having a rectangular cross section, and an arc horn according to any one of claims 1 to 3 attached to one surface of each of the plurality of power supply conductors. Characteristic switchboard. 5. The switchboard according to claim 4, wherein a pair of notches through which the pair of extensions are passed are formed on both side surfaces of each of the plurality of power supply conductors.

Images