JPS6126292B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high voltage line branching device used for high voltage underground lines.

In urban areas where underground power is distributed, high-voltage line branching devices are installed and operated on sidewalks and the like in order to branch into many power systems.

For this reason, the area occupied by sidewalks, etc. is reduced,
In order to eliminate obstacles to traffic, etc., efforts have been made to miniaturize the branching device itself, particularly to reduce its thickness.

At present, common electrodes and fixed electrodes are provided in pairs for each circuit and each phase. , a straight line connecting both contacts 1 and 2 of the common electrode (shown as Y-Y in Figure 2)
The thin multi-circuit branch device has a structure in which the contacts 1 of the common electrode are electrically connected to each phase separately by the connecting busbar 3 (see FIGS. 1 and 2). Proposed as a switch.

However, this type of multi-circuit switch requires the communication bus 3, so the structure is complicated, and there is no need to permanently install three sets of switching sections for the π branch in terms of operation.

This invention was made by focusing on the problems existing in the above-mentioned prior art, and its purpose is to reduce the number of contacts, simplify the configuration, and reduce the size of the entire device. The purpose is to provide equipment.

The first example embodying this invention is shown in Figures 3 to 3 below.
Explaining according to FIG. 10, a case 11 of this high-voltage line branching device is installed upright on a sidewalk, etc., and an insertion hole (not shown) is provided on the bottom surface of the case 11 for pulling an underground cable into the inside. At the same time, a mounting plate 12 is attached at a vertically intermediate position inside the case 11, and has three mounting holes 12a formed in the center and on both sides thereof. or,
On the upper surface of the mounting plate 12, at the peripheral edge of the mounting hole 12a, as shown in FIG. It is installed protruding into.

Next, the side cable terminals 14 that pass through the mounting holes 12a on both sides of the mounting plate 12 and are fastened to the mounting plate 12 by the fixing fittings 13 will be explained with reference to FIG. On the circumferential side of the lower half of the cylindrical cable terminal main body 15 formed of insulating rubber, a grounding member 16 made of conductive rubber and extending below the stress cone 15a at the lower end thereof is integrally molded with the main body 15. A flange portion 16a, which is held between the mounting plate 12 and the fixing fitting 13, is formed projecting from the upper circumferential side of the grounding member 16.

A corona prevention member 17 made of conductive rubber is molded integrally with the main body 15 on the inner surface of the enlarged diameter part 15b provided in the center of the hollow part of the cable terminal main body 15. Directly above 15b is the corona prevention member 17.
A fixed electrode 18 electrically connected to the upper end of the main body 15 is molded and fixed to the main body 15. Tulip-shaped fixed contacts 18a and 18b are formed at the upper and lower ends of the fixed electrode 18, respectively, and a mounting flange 18c is attached to the upper outer circumference of the fixed electrode 18 to which an arc-extinguishing tube 19 that protrudes above the main body 15 is attached.
is formed in an overhanging manner.

A cable 20 inserted and fixed into the cable terminal body 15 from the lower end of the grounding body 16 has a core wire 2.
1, a cable insulator 22 that insulates the concentric wire 21, a cable ground 23 wrapped around the circumferential side of the insulator 22, and an exterior body 24 that insulates the cable ground 23. Core wire 21
The lower contact point 18b of the fixed electrode 18 is located at the tip of the fixed electrode 18.
A tip metal fitting 25 inserted into is crimped at its lower end. And the cable insulator 22
The outer circumferential surface of is electrically connected to the lower end of the corona prevention body 17, and the cable ground 23 is connected to the mounting plate 12 via the ground body 16.
electrically connected to.

Each mounting hole 1 in the center of the mounting plate 12
A central cable terminal 27 electrically connected to the cable 26 in the same manner as the cable terminal 14 is fastened to the portion 2a. The upper part of the cable terminal 27 is formed into a bifurcated shape, and is the same as the cable terminal 14 except that a fixed contact 28a above the fixed electrode 28 and an arc-extinguishing tube 29 are provided on each of the two prongs. .

Furthermore, between the same phases, the pair of fixed contacts 28a at the center part are electrically connected to each other. It is arranged with respect to the mounting plate 12 so as to be located on a line connecting the fixed contacts 18a.

As shown in FIGS. 3 to 5, the first closing lid 31, which is removably attached to both cable terminals 14 and 27 adjacent to each other in the same phase, is made of an insulating material such as rubber or synthetic resin. A pair of fitting recesses 31a are formed on the lower surface thereof, and the upper ends of each of the cable terminals 14 and 27 can be externally fitted thereinto. A movable electrode 32 having an inverted U-shape from the front is integrally molded at the upper end of the closing lid 31.
A pair of contact portions 32a are individually suspended in each of the fitting recesses 31a so as to correspond to the fixed contacts 18a, 28a in a manner that allows them to come into contact with and separate from each other. A rod 33 is fixed.

Moreover, the second closing lid 3 shown in FIGS. 6 and 7
A point 4 is formed in an oblong U-shape so that the fixed contacts 18a on both sides of the central fixed contacts 28a can be electrically connected to each other in the same phase. Except for the first closing lid 3
It is the same as 1.

Note that the branching and linking closing lids 31 and 34 are linked to each other so that they can be opened and closed simultaneously in three phases.

Next, regarding the installation and operation of the high voltage line branching device configured as described above, Fig. 8 and Fig. 9 a to 9
Explaining according to the electrical circuit diagram in c, this high-voltage line branching device connects the high-voltage line for the drop-in point and the loop point in an underground line whose both ends are connected to the transformer Tr via the shamisen breaker CB. They are installed as branch devices B ₁ and B ₂ .

In the high-voltage line branching device, the contact portions on both sides are 45 and 46, the contact portion in the center is 47, and the main line and branching cables are 48 and 49, respectively, and the branching device for the lead-in point is
In _B1 , as shown in FIG. 9a, two trunk cables 48 are connected to each other, and
It is operated with a branch cable 49 connected to both cables 48. In addition, in the branching device B ₂ for the loop point, as shown in FIG. 9b, one trunk cable 48 and the branching cable 4
9, and the other trunk cable 48 is operated electrically independent of both cables 48 and 49. Note that the first closing cover 31 is used to connect the cable in the above two cases.

Next, an accident occurs on the main line side at the connection point, making it impossible to supply power, and the main cable 48
When operating as a high-voltage line branching device B ₃ for a special connection point where a part of the fault trunk cable 4 must be electrically independent, as shown in Figure 9c,
The main cable 48 and the branch cable 49 are connected to the second closing cover 3 so as to be electrically independent from the second circuit cover 8'.
Connect by 4.

In addition, since the second circuit closing cover 34 is used only in special cases such as temporary use, it is not necessary to permanently install it in all branching devices, and it can be treated in the same way as a tool.

Next, to explain the size of the high-voltage line branching device of this embodiment, the thickness T ₂ of this branching device is, as shown in FIG. 5, the same as the thickness T ₁ of the conventional multi-circuit switch shown in FIG. It is about 2/3 thinner than the previous model, making the device itself extremely compact. Furthermore, the number of contacts in the device of this embodiment is reduced to 2/3 compared to the number of contacts in the conventional switch, and the conventional communication busbar 3 is omitted.

Next, the differences from the previous embodiment regarding the second embodiment shown in FIGS. 10 and 11 will be explained.
In this embodiment, a fixed electrode support 3 similar to the upper part of the cable terminals 14, 27 supporting the fixed electrodes 18, 28 of the previous embodiment is mounted on the mounting plate 12 of the case 11.
6, 37 are disposed, and connecting portions 38, 39 are provided at the lower ends of the fixed electrodes penetrating each of the supports 36, 37.
Cable terminals 42 and 43 to which cables 40 and 41 are connected are connected to them.

Note that the present invention is not limited to the above embodiments, and for example, the cable terminal main body 15
molded with synthetic resin such as epoxy resin, or
As shown in FIGS. 2 and 13, the mounting plate 12 of the case 11 is provided in a vertical position, and the mounting plate 1
Any changes can be made without departing from the spirit of the invention, such as arranging the cable terminals 14 and 27 at the cable terminals 2 and 2.

As detailed above, the high voltage line branching device of the present invention has a cable terminal having two electrically connected fixed contacts and one fixed contact electrically independent of the fixed contacts. , the cable terminals provided on both sides of the cable terminal constitute a fixed electrode part, and the four fixed contacts are arranged so that their centers are located in a straight line, so that the number of contacts is small; Since the conventional communication busbar is no longer necessary, the configuration can be simplified, and
This invention is preferable for industrial use as a high-voltage line branching device because it has the effect of reducing the size of the entire device.

[Brief explanation of the drawing]

1 and 2 show a conventional multi-circuit switch, FIG. 1 is a connection circuit diagram, and FIG. 2 is a schematic plan view showing the arrangement of fixed contacts. 3 to 9 show a first embodiment of the high-voltage line branching device of the present invention, FIGS. 3 and 6 are partially cutaway front views thereof, and FIG. 4 shows the cable terminal portion thereof. 5 and 7 are schematic plan views showing the arrangement of the fixed contacts, and FIGS. 8 and 9 a to 9 c are electrical circuit diagrams thereof. 10 and 11 show a second embodiment of the present invention, FIG. 10 being a partially cutaway front view thereof, and FIG. 11 being a side sectional view thereof. FIGS. 12 and 13 show another example of the present invention, with FIG. 12 being a side sectional view thereof, and FIG. 13 being a rear view showing the state in which the cable terminal is attached. Cable terminals...14, 27, 42, 43, fixed electrodes...18, 28, fixed contacts 18a, 28a, closing lid...31, 34, movable electrode...32, contact part...3
2a, 45, 46, 47, trunk cable...48,
Accident trunk cable…48′, branch cable…4
9. High voltage line branching device...B ₁ , B ₂ , B ₃ .

Claims (1)

[Claims] 1. It is molded with a solid insulator and is composed of a plurality of fixed electrodes arranged at appropriate intervals, two contact parts corresponding to the fixed electrodes, and a movable electrode molded with a solid insulator. ,
In a high voltage line branching device in which a movable electrode can be removably opened and closed with respect to the fixed electrode, the plurality of fixed electrodes molded with the solid insulator are connected to two fixed contacts electrically connected to each other. 28a, and two cable terminals 14 each having one fixed contact 18a that is electrically independent from the fixed contact 28a of the cable terminal 27. A high-voltage line branching device characterized in that the centers of the contacts 18a and 28a are arranged in a straight line.