JPH0620264Y2 - Branching unit and branching device using this branching unit - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a branching unit used for branching on the secondary side of a network transformer or for branching on the way from a grid cable, and a branching device using this branching unit.

[Prior art and its problems]

For example, in the regular network method, which is a power supply method, if an accident occurs in the grid cable,
It is necessary to make the grid cable non-voltage and perform repair work such as fuse replacement. The structure of a conventional branching device used for branching on the secondary side of a network transformer or for branching on the way from a grid cable is shown in the figure. FIG. 6 is a schematic front view of a conventional branching device, and FIG. 7 is a schematic side view of the conventional branching device. Shown in the figure is a multi-terminal connector for 6 circuits, which is designated by reference numeral 10.
Reference numeral 0 is a trunk cable, 101 is a pedestal, 102 is a connector portion, 103 is a bus bar, 104 is a branch cable, and 105 is a branch cable gripping portion. To make the grid cable free of voltage, the connector section 10 of the optional branch cable 104
2 may be opened, and the opening is performed by bending the branch cable 104 in FIG. 7 while pulling it to the left. However, the branching device having this structure has the following problems. (A) The branch cable 104 is heavy and has high rigidity. When the connector portion 102 is opened, the branch cable 104 having this weight and high rigidity is opened, so that a relatively large force is required and it is not easy to perform the work quickly. In addition, in order to reduce this force, the branch cable 104
Since it is necessary to increase the length of the cable grip portion 105 to the connector portion 102, and an extra cable length is required, the entire apparatus becomes large. (B) The connector portions 102 are arranged in an overlapping state. Therefore, the connector 102 cannot be opened or repaired without removing the front side, and therefore the fuse of the connector 102 on the back side cannot be repaired alone. Also, thick (for 400V, 600A, diameter of about 20mm)
The branch cable 104 is a hindrance, which makes the work difficult and troublesome. Furthermore, when opening, the three phases cannot be opened at the same time, so there is the inconvenience that the open-phase operation time becomes long and the equipment heats up.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a branching unit that can be easily opened and closed and can be downsized. Another object of the present invention is to provide a branching device that can independently open and repair each phase using the branching unit.

[Configuration of the present invention]

The structure of the present invention, which has been devised to solve the above problems and achieve the object, is as follows. According to the first invention, a unit box having an openable / closable unit lid and having a busbar insertion hole, a load opening / closing mechanism provided in the unit box, and a unit box provided in the unit box are provided. Provided in the unit box and a busbar connecting portion connected to the busbar inserted in the busbar insertion hole, and an upper fuse terminal connected to the busbar connecting portion and provided in the unit box. A lower fuse terminal connected to one terminal of the load switching mechanism, a fuse mounted between the fuse terminals, and the other terminal of the load switching mechanism provided in the unit box. The load opening / closing mechanism is formed of an insulator and has a through hole, and terminals are mounted on both sides of the through hole. Extinguishing with arc extinguishing section The insertion part is formed of an arc frame and an insulator, and the insertion part is formed so as to reduce the gap to the above-mentioned arc extinguishing part so that the insertion part can be inserted and removed. An opening / closing pin provided with the opening / closing pin is provided, and a tip end portion of the opening / closing pin protrudes from the unit box to the outside, and a tip end portion of the opening / closing pin protruding outside is protected by a protection means. A branching unit in which the energizing portion contacts the terminals on both sides to be energized when attached to the arc frame, and the terminals on both sides are opened when the opening / closing pin is pulled out. According to a second aspect of the invention, there is provided a branching device characterized in that the branching unit according to the first aspect of the invention is arranged in multiple stages for each branch so that each can be operated and repaired from the front.

【Example】

The present invention will be described in more detail based on the embodiments shown in the drawings. FIG. 1 is a perspective view of a branch unit having a load opening / closing mechanism, FIG. 2 is a front view of the internal structure showing a state in which a unit lid is removed, and FIG. The figure is an illustration of a mechanism for extinguishing an arc. The branch unit 1 includes a unit box 2. The front side (left side in FIG. 3) of the unit box 2 is opened, and the unit lid 21 is attached to the opening with a bolt 210. Busbar insertion holes 24 are provided in the upper portions of both side surfaces 23 of the unit box 2. One end side of the upper fuse terminal 31 is arranged at a position corresponding to the bus bar insertion hole 24 in the unit box 2, and the upper portion thereof connects the bus bar 103 to the bus bar connecting portion 3.
It is 11. A fixing bolt 3 is attached to the busbar connecting portion 311.
12 is screwed. The attachment to the bus bar 103 is performed by inserting a fixing bolt 312 into a fixing hole (not shown) provided in the bus bar 103, and tightening and fixing it to the bus bar connecting portion 311. A holding portion 313 is attached to the other end of the upper fuse terminal 31. The holding portion 313 is provided with a compression spring 314 that biases the holding portion 313 inward.
The holding of the fuse 4 by 13 is made more reliable. Below the upper fuse terminal 31, lower fuse terminals 32 are provided at predetermined intervals. A holding portion 323 having the same shape as that of the upper fuse terminal 31 is attached to one end side of the lower fuse terminal 32, and a compression spring 324 that biases the holding portion 323 inward is provided. The current limiting fuse 4 is attached between the sandwiching portion 313 of the upper fuse terminal 31 and the sandwiching portion 323 of the lower fuse terminal 32 by sandwiching the terminal portions 41 and 42 at both ends. A tulip-shaped terminal 325 is provided on the other end side of the lower fuse terminal 32. A load opening / closing unit 5, which is a load opening / closing mechanism, is provided below the unit box 2. The load opening / closing unit 5 includes an arc extinguishing frame 51. The arc-extinguishing frame 51 is made of an insulating material and has an outer shape of a quadrangular prism. The arc-extinguishing frame 51 is provided with a through hole 510 penetrating in the length direction. Through hole 51
Reference numeral 0 denotes lock holes 511 and 511a provided at both ends for fixing the terminal 325 and a terminal 625 described later, and a mounting hole 51 provided continuously to the lock holes 511 and 511a.
2, 512a and arc-extinguishing holes 513 having a slightly smaller diameter provided between the mounting holes 512 and 512a. The inner diameter of the arc extinguishing hole 513 has the insertion portion 7 of the opening / closing pin 7 described later.
The current-carrying portion 72 and the insulating portion 74 of No. 1 are formed to have a small diameter so that they can be inserted and removed. The terminal 325 of the lower fuse terminal 32 is mounted in the mounting hole 512 on one end side of the arc extinguishing frame 51. Further, the terminal 6 of the cable receiving terminal 6 is provided in the mounting hole 512a on the other end side.
25 is installed. The other end of the cable receiving terminal 6 is bent to form the unit box 2
It protrudes to the outside from the terminal hole 26 provided through the bottom portion of the, and serves as the connection portion 61. Connection part 61
Two fixing holes 611 and 612 are provided in the. A viewing window 22 is provided on the upper portion of the unit lid 21 described above, and an operation hole 212 is provided through the lower portion at a position corresponding to the load opening / closing unit 5. The opening / closing pin 7 is inserted and mounted in the arc extinguishing frame 51 of the load opening / closing unit 5 through the operation hole 212, the terminal 625, the arc extinguishing hole 513, and the terminal 325. The opening / closing pin 7 is made of an insulating material, and the insertion portion 71 of the opening / closing pin 7 is provided with a conductor, for example, a current-carrying portion 72 made of metal. Insulating portions 74 are provided on both sides of the current-carrying portion 72 (see FIG. 4). The current-carrying part 72 is provided with the terminal 32 when the opening / closing pin 7 is attached.
Both terminals 5 and 625 are in contact with each other, and the terminals 325 and 625 can be energized. The tip portion 73 of the opening / closing pin 7 protrudes from the operation hole 212 to the outside when mounted, and
It is protected by a protective cap 213 screwed to the outer side of 12. An insertion hole 731 into which a lever or the like can be inserted in the distal end portion 73 for easy operation when the opening / closing pin 7 is inserted / removed.
Is provided. FIG. 5 is a schematic explanatory view of a branching device. The branching device A of this embodiment has a 7-branching specification for 400V.
The branching device A includes a frame 8. Inside the frame 8, three bus bars 103 are erected for each phase,
The trunk cable 100 for each phase is connected to each bus 103. Further, the branch unit 1 is arranged on the bus bar 103 in a stepwise manner. Each branch unit 1 is arranged so that the entire unit lid 21 can be seen from the front side. Connection part 61 of cable receiving terminal 6 of each branching unit 1
A branch cable 104 is connected (not visible in FIG. 5). The connecting portion 61 is protected by a protective tube 261 attached to the terminal hole 26. Each branch cable 104 hangs downward and extends outside the frame 8. (Operation) The operation of this embodiment will be described with reference to FIGS. 1 to 5. The opening and closing of the load switching unit 5 of the branch unit 1 is performed as follows. First, the protective cap 21 of the unit lid 21
By removing 3 and then pulling out the open / close pin 7, the load is released while preventing the arc generation. Here, the mechanism for extinguishing the arc will be described with reference to FIG. The energizing portion 72 of the opening / closing pin 7 is configured such that both terminals 325, 62 are energized when energized.
Both of them are in contact with each other. When the opening / closing pin 7 is pulled out, the energizing portion 72 of the opening / closing pin 7 moves to the terminal 625 side, and the contact with the terminal 325 is released. Normally, an arc is generated when the contact between the current-carrying part 72 and the terminal 325 is released, but the current-carrying part 72 releases the contact and the arc-extinguishing hole 513 at the same time.
Since the insulating portion 74 interposed between the energizing portion 72 and the terminal 325 is in close contact with the inner wall of the arc extinguishing hole 513, arc generation using air as a medium is prevented. Therefore, a part of the terminal is not vaporized or deformed by the arc, which is preferable in terms of safety and security. As described above, opening and closing of each branch unit 1 can be easily performed only by inserting and removing the small and lightweight opening / closing pin 7 mounted on the load opening / closing unit 5. Further, since the load switching unit 5 has a structure separated from the branch cable 104, the conventional branch cable 1
The extra length of 04 is unnecessary. In the branching device A, the opening / closing pin 7 can be inserted / removed and the current limiting fuse 4 can be replaced by each branching unit 1 alone, and since the branching cable is provided below, it does not interfere. Also, when opened, the three phases can be opened simultaneously. The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the claims for utility model registration.

[Effect of device]

The present invention has the above-mentioned configuration and has the following effects. (A) The tip of the opening / closing pin that constitutes the load opening / closing mechanism protrudes from the unit box to the outside. To open / close the branch unit, the opening / closing pin is simply inserted and removed from the outside of the unit box. The branch unit is easy to open and close. Further, since the tip end portion of the opening / closing pin protruding to the outside is protected by the protection means, it is possible to prevent an accident such as accidentally pulling out the opening / closing pin. Furthermore, since the load switching mechanism has a structure separated from the branch cable, the extra length of the branch cable as in the prior art is unnecessary, and the entire branch device can be downsized. (B) The devices that make up the branch unit are housed in a unit box, and the unit box has a unit lid that can be opened and closed. Therefore, the equipment can be repaired by opening and closing the unit lid, and the work is easy. Moreover, unlike the conventional branching device, each branching device can be made independently, so workability is good. Further, at the time of opening, it is easy to open the three phases at the same time, so that the open-phase operation time is eliminated, and there is no inconvenience that equipment is generated unlike the conventional case. (C) A busbar insertion hole is formed in the unit box, and a busbar connecting portion connected to the busbar inserted in the busbar insertion hole is provided inside. Therefore, when installing a plurality of branch units, it is sufficient to arrange the branch units in the direction of the busbar, and the installation is simple.

[Brief description of drawings]

FIG. 1 is a perspective view of a branch unit having a load opening / closing mechanism, FIG. 2 is a front view of the internal structure showing a unit lid removed, and FIG. FIG. 5 is an explanatory view of an arc extinguishing mechanism, FIG. 5 is a schematic explanatory view of a branching device, FIG. 6 is a schematic front view of a conventional branching device, and FIG. 7 is a schematic side view of a conventional branching device. 1: Branch unit 31: Upper fuse terminal 311: Bus connection part 32: Lower fuse terminal 4: Fuse 5: Load switching unit 51: Arc extinguishing frame 510: Through hole 325, 625: Terminal 513: Arc extinguishing hole 6: Cable receiving Terminal 7: Open / close pin 71: Insertion part 72: Conducting part A: Branching device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Seiji Inoue Seiji Inoue 3330 Nakatsukuma Kitamogan-cho, Sanyogi-gun, Saga Daiden Co., Ltd. Saga Factory (72) Kazushige Moriyama 3330 Nakatsukuma Kitamogan-cho, Sanyogi-gun Oda Electric Co., Ltd. Company Saga factory (56) Reference JP-A-57-88634 (JP, A) Actually developed Shou-57-36711 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A unit lid (21) that can be opened and closed,
A unit box (2) having a busbar insertion hole (24), a load opening / closing mechanism provided in the unit box (2), and a busbar insertion hole provided in the unit box (2). (2
The busbar connecting portion (311) connected to the busbar inserted in (4) and the busbar connecting portion (31) provided in the unit box (2).
The upper fuse terminal (31) connected to 1), the lower fuse terminal (32) provided in the unit box (2) and connected to one terminal of the load switching mechanism, Fuse (4) mounted between fuse terminals (31, 32)
And a cable receiving terminal (6) provided in the unit box (2) and connected to the other terminal of the load switching mechanism, the load switching mechanism is formed of an insulator, It has a through hole (510), terminals (325, 625) are mounted on both sides of this through hole (510), and an arc-extinguishing frame (513) with arc-extinguishing holes (513) between these terminals (325, 625). 51)
And the insertion part (71) is formed so that the clearance can be made as small as possible with the arc extinguishing hole (513) as far as it can be inserted and removed.A part of the insertion part (71) has insulating parts on both sides. An opening / closing pin (7) having a current-carrying part (72) provided with (74) is provided, and the tip end of the opening / closing pin (7) protrudes from the unit box (2) to the outside. The tip of the protruding opening / closing pin (7) is protected by a protection means, and when the opening / closing pin (7) is attached to the arc extinguishing frame (51), the energizing part (72) has terminals (325,625) on both sides. ) To energize, and when the open / close pin (7) is removed, the terminals (32
5,625) is a branch unit that is open. 2. A branching device, wherein the branching unit according to claim 1 is arranged in multiple stages for each branch so that each can be operated and repaired from the front.