JPS6311845B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a multi-circuit switch.

Conventional multi-circuit switches are constructed by incorporating switching sections for several circuits into a single case. As a result, the overall size is large, and there are defects such as the inability to pass through places with narrow entrances such as manholes, and the inability to carry and install underground power distribution lines into underground holes through manholes. Ta. Moreover, the switch is 1
Even if only the switching part of a circuit breaks down, it is necessary to replace the entire switch, which is uneconomical.
Especially in gas-filled switches, if there is gas leakage from the case, all the opening/closing parts become unusable, which is a big problem.

Furthermore, since the number of circuits built into the case of the switch is set at the time of manufacture, it is not possible to increase or decrease the number of circuits at will without replacing the switch itself. There was a defect.

The present invention has been made by focusing on the problems existing in the above-mentioned prior art, in which an opening/closing part is provided inside the case, and a bushing electrically connected to the opening/closing part is connected to the case. A plurality of unit switches fixed through each other are removably attached to a mounting frame, and multi-branch junction conductors are fitted to the bushings of the plurality of unit switches to connect the plurality of unit switches to multiple units. By electrically connecting in parallel to the branch junction conductor, unit switches can be brought in one by one for places with narrow entrances, such as manholes, and multi-circuit switches can be installed inside underground holes. In addition, if a unit switch for one circuit breaks down, remove that unit switch from the mounting frame and disconnect it from the multi-branch junction conductor to keep the healthy circuit intact, and then remove the unit switch from the multi-branch junction conductor. It is an object of the present invention to provide a multi-circuit switch which can be electrically connected to a separately prepared unit switch and which can be attached to a mounting frame to increase the number of circuits.

An embodiment embodying the present invention will be described below with reference to the drawings. A support 2 is erected on a floor 1 in an underground hole of an underground power distribution line, and an angle is formed between the upper ends of the support 2. A shaped mounting frame 3 is installed and fixed.

A large number of unit switches 4 are arranged in parallel on the mounting frame 3, and the mounting frame 3 is installed on each front and rear side of the airtight case 5 filled with a gas insulator such as SF ₆ .
An angle-shaped mounting bracket 8 fixed to the lower surface of the housing with bolts 6 and nuts 7 is fixed.
Three-phase bushings 9 and 10 each having a cylindrical shape are hermetically fixed to the top plate and bottom plate of the case 5, and the upper bushings 9 are respectively sandwiched back and forth on the top surface of the case 5. A rod-shaped fixing metal fitting 11 with a male thread cut on the upper part is erected at the position shown in FIG. A rod-shaped conductor 13 having a tulip-shaped female contact 12 at its outer end is hermetically fixed to the axial center of each of the bushings 9 and 10, and the upper and lower bushings between the same phase A puffer type opening/closing part is provided between the inner ends of the conductors 9 and 10.

The opening/closing part includes a cylindrical fixed electrode 14 provided at the inner end of the conductor 13 of the upper bushing 9,
A cylindrical cylinder 15 made of an insulating material supported and fixed on the fixed electrode 14;
an orifice cone 16 as a piston that is movable up and down in contact with the inner surface of the orifice cone 16; a cylindrical movable electrode 17 fixed to the orifice cone 16 so as to be able to engage with and be detached from the fixed electrode 14; The lower end of the movable electrode 17 and the lower bushing 1
The flexible conductor 18 is electrically connected to the inner end of the conductor 13 at its upper and lower ends. A drive member 19 is provided at the lower end of the movable electrode 17 and can move the movable electrodes 17 for three phases up and down simultaneously.
is fixed, and its driving member 19 is moved up and down via a mechanism (not shown) provided inside the case 5 when the operating handle 20 with a pointer provided on the front surface of the case 5 is rotated. This allows the opening/closing part to be opened/closed.

Next, the multi-branch junction conductor 21 for electrically connecting the upper bushings 9 of each unit switch for each phase will be explained. The junction conductor 21 has a horizontally extending current-carrying conductor in its center. 22 is arranged, and the lower surface of the current-carrying conductor 22 has many protrusions 2.
2a are formed to protrude downward at equal intervals, and a male contact 23 that is inserted into the female contact 12 of the bushing 9 so as to be able to come into contact with and separate from the female contact 12 of the bushing 9 projects downward. It is formed. Further, on the circumferential side of the current-carrying conductor 22, there is an inner conductive layer 24 formed of a conductive resin such as conductive rubber, an insulating layer 25 formed of an insulating material such as insulating rubber, and an inner conductive layer 25 formed of a conductive resin. The outer conductive layers 26 are sequentially coated in a concentric manner. Note that the inner conductive layer 24 is not coated around the male contact 23;
A cylindrical fitting part 27 formed of the insulating layer 25 and the outer conductive layer 26 is provided so as to surround the circumferential side of the male contact 23 at a distance, and the bushing 9 is different from the fitting part 27. The contact boundary surface of the insulating layer 25 is designed to have a withstand voltage.

And the juncture conductor 21
The case is secured by a presser fitting 28 which is loosely fitted to each pair of fixing fittings 11 erected on the upper surface of the case 5 so as to sandwich the bushing 9 in the front and back, and a nut 29 which is screwed into the male threaded portion of each fixing fitting 11. 5, and a contact surface pressure of the insulating layer 25 at the fitting portion 27 with respect to the bushing 9 is obtained. Furthermore, the bushing 9 of the unit switch 4 is connected to the unit switch 4 by the junction conductor 21.
For example, a blind lid 30 as shown in FIG. 4 is fitted to the fitting portion 27 that is not fitted to the
The insulating portion 30a is coated with a conductive layer 30b made of conductive resin so as to be in contact with the outer conductive layer 26 of the fitting portion 27.

And multi-branch junction conductor 2
A cable head 31a of a trunk cable 31 is fitted into each lower bushing 10 of the unit switches 4 at both ends of a large number of unit switches 4 electrically connected in parallel by 1, and electrically connected. At the same time, each lower bushing 10 in the remaining unit switch 4 is provided with a branch line cable 32.
The cable head 32a is fitted and electrically connected.

In this embodiment, the trunk cable 31 is connected to the unit switches 4 at both ends, but depending on how the multi-circuit switch configured as described above is used, one
One trunk cable 31 can be connected to any one of the many unit switches 4, or two trunk cables 31 can be connected to desired two of the many unit switches 4. The connection method, such as connecting each device separately, shall be determined as appropriate depending on the method of use.

Now, the multi-circuit switch configured as described above is divided into small parts including the support 2, the mounting frame 3, the unit switch 4, and the multi-branch junction conductor 21, and then transported to an underground hole of an underground distribution line. do. Then, a support 2 is erected on the floor 1 of the underground hole, etc., and a mounting frame 3 is erected between the upper ends of the support 2, and each unit switch 4 is attached to the mounting frame 3 from below. The junction conductor 21 is fitted and connected to the bushing 9 above the unit switch 4 fixed to the mounting frame 3, and the junction conductor 21 is fixed to the unit switch 4 with the holding fitting 28. And the bushing 10 below
For main line and branch line cables 31, 32
When the cable heads 31a and 32a are fitted and connected, the installation of the multi-circuit switch on the floor 1 is completed.

In a multi-circuit switch installed in this way, if one unit switch 4 in a branch circuit becomes unusable due to a failure in the switching section or a gas leak, or if the capacity of the unit switch 4 is When replacing the lower bushing 10 of the unit switch 4 to increase the number of circuits or to reduce the number of circuits,
Cable head 32 of cable 32 for branch line from
a (if the unit switch 4 in the main circuit breaks down, just remove the cable head 31a of the main cable 31 from the bushing 10), and also remove the retaining metal fitting 28 from the fixing metal fitting 11 of the unit switch 4. Then, if the mounting bracket 8 of the unit switch 4 is removed from the mounting frame 3, the unit switch 4 can be removed downward from the junction conductor 21 and can also be removed from the mounting frame 3.

When attaching another unit switch 4 to the removed location, or to increase the number of circuits, remove the blind cover 30 from the fitting part 27 to which the blind cover 30 was fitted and install the unit switch. 4, the mounting bracket 8 of the unit switch 4 is attached to the mounting frame 3 so that the upper bushing 9 fits into the fitting part 27 of the junction conductor 21, contrary to the case of removing it. After that, the junction conductor 21 is fixed to the unit switch 4 using the holding metal fitting 28, and the cable head 32a (or 31a) is further fitted and connected to the bushing 10 below the junction conductor 21.

Next, the connection state of the multi-circuit switch in an example in which five fitting portions 27 of the multi-branch junction conductor 21 are formed in the above embodiment will be explained according to FIGS. 5 and 6. When forming a circuit and using two of them as main lines,
As shown in FIG.
It is sufficient to connect the main line cable 31 to two unit switches 4 and connect the branch line cable 32 to the other one.

Further, in the case where the junction conductor 21 forms eight circuits, which are more than the number of fitting parts 27, and one of the circuits is used as a main line, as shown in FIG. 6, the junction conductor 2
1, five unit switches 4 are connected to each junction conductor 21, and each junction conductor 2
1, each end of the connecting cable 33 is fitted and connected to the lower bushing 10 of each unit switch 4 connected to the unit switch 4, and the trunk cable 31 is connected to the desired one unit switch 4. , and then connect the branch line cable 32 to the other seven unit switches 4.

As described in detail above, the multi-circuit switch of the present invention includes a plurality of unit switches each having a switching section electrically connected to the pair of bushings in the case to which the pair of bushings are fixedly fixed. a multi-branch junction conductor in which a number of contacts are provided to the current-carrying conductor and are removably fitted to and electrically connected to one bushing of the unit switch, and said one bushing is The unit switch is configured with a mounting bracket provided on the unit switch to fix the unit switch to the mounting frame so that it can be removed from the mounting frame in the direction of detachment from the junction conductor, so that the unit switch and the multi-branch It can be divided into the junction conductor and the mounting frame, and the unit switch can be easily attached to and detached from the junction conductor and the mounting frame. Not only can it be carried and installed in places such as underground holes of underground distribution lines, but if one unit switch breaks down, only that faulty unit switch can be replaced, reducing the number of circuits. This invention is preferable for industrial use as a multi-circuit switch because it has the effect of easily dealing with changes in capacity and capacity.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and other systems such as a vacuum switch may be adopted in addition to the puffer type as the opening/closing part, or the unit switch may be equipped with an absolute insulator instead of a gas insulator. Any changes can be made without departing from the spirit of the invention, such as by adopting another type of insulated arc-extinguishing method or by attaching the unit switch to the mounting frame from above or from the side. .

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the multi-circuit switch of the present invention, FIG. 2 is a side view, FIG. 3 is a partially plan view, and FIG. FIGS. 5 and 6 are enlarged sectional views showing an example of a blind lid that fits into a branch junction conductor; FIGS.
Each figure is a connection circuit diagram showing an example of a connection state of a multi-circuit switch. Floor…1, Support…2, Mounting frame…3, Unit switch…4, Case…5, Mounting bracket…8,
Bushing...9,10, Female contact...12,
Conductor...13, Fixed electrode...14, Cylinder...
...15, Orifice cone...16, Movable electrode...
...17, Flexible conductor...18, Operation handle...2
0. Multi-branch junction conductor...2
1. Current-carrying conductor...22, Male contact...23, Trunk line cable...31, Branch line cable...3
2.

Claims (1)

[Scope of Claims] A plurality of unit switches provided with opening/closing parts electrically connected to the bushings in a case to which a pair of bushings are penetrated and fixed, and one of the unit switches. a multi-branch junction conductor in which a plurality of contacts are provided to a current-carrying conductor and are removably fitted to and electrically connected to a bushing; and a direction in which the one bushing separates from the junction conductor. A multi-circuit switch comprising: a mounting bracket provided on a unit switch for fixing the unit switch to a mounting frame so as to be removable from the mounting frame. 2. The multi-circuit switch according to claim 1, wherein the case of the unit switch is airtightly filled with a gas insulator such as SF ₆ .