JPS6242441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-circuit branching device particularly suitable for installation in an underground hole in an underground power distribution line.

Especially when it comes to power distribution in congested areas of large cities,
undergrounding is being promoted for reasons such as improving supply reliability in case of general disasters. At the same time, it has become necessary to install the branching device itself underground.

However, when installing a branching device inside an underground hole, the manhole for entering the underground hole must be opened and closed, and the diameter of the manhole cannot be made very large. The size of the branching device that can be brought into the system is limited.

This invention was made in response to the above problem, and its purpose is to provide a multi-circuit device that can be installed inside an underground hole as a branching device that can branch out the desired number of lines regardless of the size of the manhole. The purpose of the present invention is to provide a branching device.

Hereinafter, a first embodiment in which the present invention is embodied in a high-voltage multi-circuit branching device will be described with reference to FIGS. 1 to 6. First, let's talk about the branch switch unit S.
To explain according to FIGS. 4 to 4, a support 2 is erected on the top surface of a metal sealed container 1 having a watertight structure, and a handle portion 3a is formed at one end of the upper end of the support 2. An operating member 3 is rotatably attached at the center. A connecting rod 4 is operatively connected to the other end of the operating member 3, and an operating rod 5 that penetrates the top plate of the airtight container 1 is fixed to the lower surface of the connecting rod 4 at the outer end of each phase. ing. The operating rod 5 is moved up and down via the connecting rod 4 when the operating member 3 is rotated.

The lower end of a bellows 6 whose upper end is in close contact with the lower surface of the top plate of the airtight container 1 is tightly attached to the upper surface of the mounting portion 5a at the inner end of the operating rod 5, and a support insulator 7 is fixed to the lower surface of the mounting portion 5a. ing. A movable contact 8 is attached to the lower surface of the support insulator 7, and a flexible bus 9 is connected to the movable contact 8 at its center.

A cable terminal 10 corresponding to the movable contact 8 is fixed to the bottom plate of the closed container 1 in a watertight manner,
A fixed contact 11 to which the movable contact 8 is connected and separated is connected to the inner end of the cable terminal 10, and a branch electrically connected to the fixed contact 11 is connected to the outer end of the cable terminal 10. cable 1
2 are attached in a watertight manner.

A cylindrical insulating member 13 made of epoxy resin is penetrated and fixed in a watertight manner to a pair of opposing side plates of the airtight container 1 by a cylindrical connecting member 14 fitted on the outer periphery of the insulating member 13, and each insulating member At the outer end of the member 13, a fitting portion 13a in the shape of a truncated cone that expands outward is recessed inward. A conductive layer 15 made of conductive rubber or the like is integrally molded onto the insulating member 13 at the inner end of the fitting portion 13a. A connecting conductor 16 whose inner end is connected to the end of the flexible bus bar 9 is integrally molded in the hollow portion of the insulating member 13 in a watertight manner, and a tulip-shaped connecting portion is provided at the outer end of the connecting conductor 16. 16a is formed.

A pair of connecting terminal units each composed of an insulating member 13 and a connecting conductor 16 are provided for each phase, and a male threaded portion 1 is provided on the outer periphery of the connecting member 14.
4a is formed.

Next, the busbar connection unit 17 that is connected to the connection terminal unit and can connect a plurality of branch switch units S will be explained with reference to FIG. A cylindrical insulating part 18 is formed in the shape of a truncated cone, the diameter of which decreases toward the distal end so that it can be fitted into the fitting part 13a, and both ends of the connecting conductor 16 are connected to the connecting part 16a. The conductor portion 19 is integrally molded in a watertight manner into the hollow portion of the insulating portion 18 so as to be connected to the conductor portion 19 in a separable manner. The insulating part 18 is formed of insulating rubber, and has a flange part 18a protruding from the center thereof, on which a ground layer 20 similar to the conductive layer 15 is integrally molded.

Now, as shown in Fig. 5, when installing a high-voltage multi-circuit branch device in an underground hole 23 that communicates with the ground through a manhole 21 and also communicates with a conduit 22 where cables are laid, first Hole 2
A pedestal 24 is installed inside 3. Next, the branch switch unit S is carried in through the manhole 21 and placed on the pedestal 24. Then, as shown in FIG. 4, the bus bar connection unit 17 is fitted to the connection terminal unit of the switch unit S to connect two adjacent switch units S.

Further, the conductor portion 19 of the connecting unit 17 is connected to the connecting conductor 16 of the switch unit S, and the insulating portion 18 of the connecting unit 17 is brought into close contact with the insulating member 13 of the switch unit S with a predetermined surface pressure. In this state, the continuous members 14 of both switch units S are connected to each other by a connecting ring 25 having a female threaded portion 25a formed on the inner periphery. At this time,
The connection layer 20 of the connection unit 17 is the continuous member 1
4 and is grounded through the closed container 1.

In this way, three branch switch units S are connected, and blind plugs are provided at both ends of one of the connecting terminal units in a watertight manner, and the connecting terminal unit is attached to one side plate of the closed container 1. A branch switch unit S' for the main line that enables connection in only one direction is connected.
Then, cable terminal 1 of branch switch unit S
When the branch cable 12 is connected in a watertight manner to the branch cable 12 to the main line branch switch unit S', and the main cable 12' is connected in a watertight manner to the cable terminal 10 of the branch switch unit S' for the main line, a high voltage multi-circuit branch as shown in FIG. The device is assembled.

Note that, like the multi-circuit branching device of this embodiment,
If the units S, S', 17 and their connecting parts are formed in a watertight manner, rainwater will not enter into the underground hole 23 during heavy rain and the branching device will be completely submerged. Electric shock accidents due to current leakage can be prevented.

Next, a second embodiment of the means for bringing the insulating member 13 of the connecting terminal unit into close contact with the insulating part 18 of the bus bar connecting unit 17 will be described with reference to FIG. The outer circumference of the continuous member 14 is not formed with a male threaded portion 14a, but an annular groove 26 is formed around it, and a female threaded portion 25a is formed only on one half of the inner circumference of the connecting ring 25. An annular protrusion 27 that is loosely fitted into the annular groove 26 is formed at the other end of the periphery.

Therefore, if the close contact means of this embodiment is used, the insulating part 18 of the connecting unit 17 is not brought into close contact with the insulating member 13 of the switch unit S with a predetermined surface pressure in advance, and the adjacent switches can be connected to each other. Connecting ring 2 provided on one continuous member 14 of the container unit S
The female screw portion 25a of No. 5 may be screwed into the male screw portion 14a of the other continuous member 14.

Furthermore, another embodiment of the bus bar connection unit 17 will be described with reference to FIG. 8. A cylindrical conductive rubber 28 for corona prevention is provided on the inner periphery of the insulating portion 18 of the bus bar connection unit 17 of this embodiment. At the same time, a tulip-shaped female connection portion 19a is formed at both ends of the conductor portion 19. and,
A rod-shaped male connecting portion 29 corresponding to the connecting portion 19a of the conductor portion 19 is formed at the outer end of the connecting conductor 16, and a contact portion 30 that is inserted into contact with the conductive rubber 28 is formed. has been done.

Therefore, the main difference between the busbar connection unit 17 of this embodiment and the first embodiment is that the connection to the connection conductor 16 is reversed.

Note that the present invention is not limited to the above-mentioned embodiments, and the sealed container 1 may be filled with not only air but also oil, an arc-extinguishing gas such as SF6, etc., or may be in fixed contact with the movable contact 8. The opening/closing mechanism consisting of the contact 11 may be a vacuum switch, the opening/closing mechanism may be opened/closed from the outside by using a motor or solenoid that drives the movable contact 8 by an external signal, or the movable contact 8 may be sealed. An O-ring may be used in place of the bellows 6, or an underground hole 23 may be used as an installation location for the multi-circuit branching device of the present invention.
Below, we adopt semi-underground or above ground installation locations,
Connecting terminal units to which the bus bar connecting unit 17 can be connected may be provided at three or more locations on the sealed container 1, or the flexible bus bar 9 may be provided with connecting terminal units to which the bus bar connecting unit 17 can be connected, or as a means for electrically connecting the movable contact 8 and the connecting terminal unit. Instead, a rolling contact member such as a roller that is pressed against both may be used, or a means for sliding the movable contactor 8 against the connecting terminal unit may be used to electrically connect the two. , can be arbitrarily modified without departing from the spirit of the invention.

As described in detail above, the multi-circuit branching device of the present invention connects any number of branch switch units S using the connecting terminal unit, so that the desired number of lines can be connected regardless of the size of the manhole 21. This invention has the advantage of being able to be installed in the underground hole 23 as a multi-circuit branching device capable of branching, and is therefore a preferred invention for industrial use as a multi-circuit branching device.

[Brief explanation of the drawing]

1 to 3 show a branch switch unit of a first embodiment embodying the present invention, FIG. 1 is a perspective view thereof, FIGS. 2 and 3 are side sectional views thereof, and FIG.
The figure is an enlarged cross-sectional view showing a state in which connecting terminal units of adjacent branch switch units are connected by a busbar connecting unit, and Figure 5 is a schematic cross-sectional view showing a state in which a high-voltage multi-circuit branch device is installed in an underground hole. , 6th
The figure is a circuit diagram of the high-voltage multi-circuit branch switch in FIG. 5. FIG. 7 is a sectional view of a main part showing a second embodiment of a means for bringing the insulating member of the connecting terminal unit into close contact with the insulating part of the bus bar connecting unit. Airtight container...1, Support...2, Operating member...
3. Connecting rod...4. Operating rod...5. Movable contact...
...8, Flexible busbar...9, Cable terminal...10,
Fixed contact...11, Branch cable...12, Trunk cable...12', Insulating member...13, Continuous member...14, Connecting conductor...16, Bus bar connecting unit...17, Insulating part...18 , conductor part...1
9. Branch switch unit...S, Branch switch unit for trunk line...S'.

Claims (1)

[Claims] 1. A sealed container 1; a fixed contact 11 provided in the sealed container and to which the branch cable 12 is electrically connected;
a movable contact 8 which is arranged so as to be able to be brought into contact with and separated from it by an external operation, and which is electrically connected to the bus bar; A switch unit comprising a plurality of connecting terminal units each including a connecting conductor 16 that is electrically connected and arranged so that its outer end can be exposed, and an insulating member 13 that covers the outside of the connecting conductor 16. A busbar connection unit 17 is configured from a conductor 19 formed to be connectable to the outer end of the connection conductor 16 and an insulator 18 covering the conductor 19, and a plurality of switch units are connected to the busbar connection unit 17. A multi-circuit branching device in which connecting terminal units are arranged to face each other, and the connecting terminal units of opposing switch units are connected by the busbar connecting unit 17.