JPS6412058B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical cutout incorporating an arrester.

As a cylindrical cutout housing an arrester, those having the configurations shown in (1) to (3) below have been proposed in the past.

(1) A structure in which a cylindrical part is formed approximately at the center of the cylindrical main insulator and branches in a direction perpendicular to the main insulator, and the arrester is housed within the cylindrical part.

(2) A structure in which the diameter of the entire cylindrical main body insulator is increased, and the fuse tube and arrester are arranged in parallel.

(3) A structure in which a semi-cylindrical bulge is integrally formed in the lower half of the cylindrical main insulator, and an arrester is mounted within the bulge.

However, the structure (1) is difficult to manufacture because it is necessary to provide a cylindrical insulator extending perpendicularly to the center of the main insulator. In addition, since this cylindrical insulator is also used as a support insulator, there is a problem in terms of strength when the insulator is manufactured integrally using a splicing method. Furthermore, in this structure, since the arrester is located in the center of the main insulator, it is necessary to devise a connection between the arrester and the charging side electrode.

Next, in the structure (2) above, the main insulator itself becomes considerably large, which poses problems in terms of weight and cost. Furthermore, since the fuse tube and the arrester are arranged in parallel inside the main body insulator, the structure becomes complicated due to the provision of insulating partition walls, etc., and a wasted space is required. Furthermore, from the point of view of sealing the arrester, such a configuration has problems in sealing the lower opening, and is not very convenient in practice.

In addition, in the structure (3) above, the main body insulator is deformed, so not only does it have the same sealing problem as the structure (2) above, but the connection to the charging side electrode of the arrester is a little complicated, which reduces workability. There are also problems in the manufacturing of the main insulator.

This invention was made in order to solve the above problems, and the upper part of the cylindrical main body insulator in the conventional cylindrical cutout is slightly extended to form an arrester housing part, and the arrester is placed in the housing part. By connecting the upper electrode provided in the fuse cylinder storage part to the charging side electrode of the arrester, it is possible to make it more compact, and also to make the connection to the charging side electrode of the arrester easy and simple. Along with the rubber molded cone in which the arrester is embedded, it is removable from the ground side electrode and main body insulator, making it easy to replace the arrester and the elements within it.
Furthermore, the object is to provide a cylindrical cutout with a built-in arrester that can be made aesthetically pleasing.

An embodiment of the present invention will be described below with reference to FIG. 1. A cylindrical main body insulator 1 in this embodiment
An annular locking step 2 is protruded from the upper inner circumferential surface, so that its inner cavity is divided into upper and lower sections, and an arrester storage section 3 is formed above the locking step 2. A fuse cylinder housing portion 4 is formed below the stop portion 2 . Further, a cylindrical upper tightening bolt 5 and an upper tightening nut 6 screwed onto the outer periphery of the cylindrical upper tightening bolt 5 are fixed to the locking stepped portion 2 in an airtight manner through packings 7 and 8, respectively. Note that the inner circumference of the upper tightening bolt 5 is internally threaded.

A connecting bolt 9 is screwed onto the inner periphery of the upper tightening bolt 5 from below so that its upper end projects into the arrester housing 3. A stabilizer fitting 10 is screwed together. An upper connecting terminal 11 loosely fitted onto a connecting bolt 9 is fastened between the upper tightening nut 6 and a charging side electrode 32 of the arrester (to be described later) in the arrester housing 3 via a washer. An upper electrode 12 loosely fitted onto the connecting bolt 9 is swingably locked between the head of the bolt 9 and the stabilizing fitting 10. Note that a spring 14 for suspending the arc extinguishing rod 13 is hung between the head of the connecting bolt 9 and the upper electrode 12.

Upper and lower rubber mold cones 15 and 16 are provided on the circumferential side of the main insulator 1 at positions corresponding to the inner bottoms of the arrester housing 3 and the fuse cylinder housing 4.
are fixed separately, and each rubber mold cone 15,
Power supply side and load side lead wires 17 and 18 are integrally molded on the power supply side 16, respectively. The inner end of the power supply side lead wire 17 is crimped to the upper connection terminal 11, and the inner end of the load side lead wire 18 is connected to a lower electrode 19 fixed to the lower part of the fuse cylinder housing 4.
It is connected to the. And the fuse cylinder storage part 4
A fuse tube 20 is replaceably mounted between upper and lower electrodes 12 and 19 respectively disposed at the inner top and bottom of the fuse tube.

A mounting bracket 21 for attaching the main insulator 1 to a bracket (not shown) such as a telephone pole is attached to the outer periphery of the central part of the main insulator 1, and a plurality of (for example, three) mounting brackets are attached to the lower end of the main insulator 1. The sealing plug 2 is closed by the locking metal fitting 22.
A hook member 2 for removably and sealingly holding 3.
4 is fixed.

On the other hand, on the upper end of the main insulator 1, one end of a ground wire 25 is integrally molded, and a rubber molded cone 26 is tightly fitted and fixed to the upper end of the main insulator in a removable manner. A drain fitting 27 embedded in the rubber mold cone 26 is caulked together with the ground wire 25, and the other end of the ground wire 25 is connected to the mounting fitting 21. Note that a female threaded cylinder portion 27a is formed in the lower half of the draining fitting 27.

A ground side electrode 2 is provided inside the arrester housing 3.
8, compression spring 29, flexible conductor 30, terminal plate 31,
An arrester consisting of a charging side electrode 32, a nonlinear resistance element (characteristic element) 33 with excellent non-driving current characteristics such as a zinc oxide element, an intermediate electrode 34, and an insulating tube 35 is housed and fixed in an airtight state, and its earth side electrode The intermediate electrode 34 is screwed and fixed to the male threaded portion 28 a protruding from the upper surface of the draining fitting 28 , and the female threaded cylinder portion 2 of the draining fitting 27 is further above the intermediate electrode 34 .
The connection bolt 9 is screwed into the female threaded hole 32a on the lower surface of the charging side electrode 32. The pair of upper and lower terminal plates 31 are made of soft metal in order to make good contact with the non-linear resistance element 33, and the compression springs 29 are arranged between an appropriate number of elements 33 arranged in series and between the elements 33. The ends of the flexible conductor 30 are wound and fixed around the upper and lower ends of the compression spring 29, and the ends of the flexible conductor 30 are fixed to the upper and lower ends of the compression spring 29. This ensures more reliable electrical conduction between the two.

Threads are cut on the circumferential sides of the charging side electrode 32 and the intermediate electrode 34 of the arrester, and both electrodes 3
2 and 34 are screwed to both upper and lower ends of the insulating cylinder 35.

The flexible conductor 30 may be directly welded between the ground side electrode 28 and the upper terminal plate 31, and the ground wire 25 may be welded by coloring or marking the insulating layer.
This earth wire 25 may be clearly distinguished from the respective lead wires 17 and 18 by applying a display means such as pasting a colored tape to the outer peripheral surface of the insulating layer.

Now, the cylindrical cutout configured as described above is a non-linear resistance element 3 that has excellent non-continuous flow properties, such as a zinc oxide element, even if a lightning surge enters the cutout.
3, the discharge is discharged to the ground via the mounting bracket 21 and the cross arm, which not only protects the cutout itself from damage but also protects power distribution equipment such as a transformer connected via the load side lead wire 18 of the cutout from lightning surges. .

In addition, since the cylindrical cutout configured as described above has a structure in which the upper part of the main body insulator of a conventional cutout is slightly extended, there is no problem with the form, and there is no need to worry about damaging the function and structure of a conventional cutout. In addition, the charging side electrode 32 of the arrester and the power supply side lead wire electrode part can be easily shared, the connection to the charging side electrode 32 can be simplified, and workability is greatly improved. Further, if the upper end of the main body insulator 1 is closed with the molded cone 26 in which the ground wire 25 is embedded as in this embodiment, the overall aesthetic appearance is excellent.

In addition, in the cylindrical cut-out configured as described above, the ground wire 25 can be removed from the ground side electrode 28 and the main insulator 1 together with the rubber mold cone 26, and the arrester also connects its charging side electrode 32 to the connecting bolt. The intermediate electrode 34 and the charging side electrode 32 can be taken out from the arrester housing 3 by removing the intermediate electrode 34 and the charging side electrode 32.
By removing the non-linear resistance element 33 from the insulating tube 35, the non-linear resistance element 33 can be taken out from inside the insulating tube 35, so that the arrester and the elements therein can be easily replaced.

Furthermore, another example in which the arrester of the above embodiment is provided with a gap will be explained with reference to FIG. 3
6 and 37 are arranged opposite to each other at both ends of the annular insulating spacer 38. Therefore, in this embodiment, a non-following current characteristic is reliably obtained, and there is no risk of overcurrent even if the mounting bracket 21 is touched. In this embodiment, the series gap is provided on the ground side, but it may be provided on the charging side.

As described above, the present invention divides the inner cavity of the cylindrical main body insulator into upper and lower parts at the upper part, and uses the upper part as an arrester housing part and the lower part as a fuse cylinder housing part, and inside the arrester housing part, there is a zinc oxide element, etc. An arrester having a non-linear resistance element is housed and fixed,
An upper electrode connected to the charging electrode of the arrester is fixed at the top inside the fuse tube housing, a lower electrode is fixed at the bottom inside the fuse tube housing, and the earth side electrode of the arrester is connected to the main body insulator. A ground wire, one end of which is embedded in a rubber mold cone that is removably formed and tightly fitted to the upper end, is connected removably to one of the charging side electrode of the arrester and the upper electrode. By connecting the power supply side lead wire to , and connecting the load side lead wire to the lower electrode, the entire cutout can be made compact, and the connection to the charging side electrode of the arrester can be simplified. It is preferable for industrial use as a cylindrical cut-out with a built-in arrester because the work is easy, the arrester and the elements therein can be easily replaced, and the appearance is also excellent. It is an invention.

Note that this invention is not limited to the above embodiments, and may include changing the shape and configuration of each member, etc.
Any changes can be made without departing from the spirit of the invention.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a cylindrical cutout incorporating the arrester of the present invention, FIG. 2 is a cross-sectional view of the main part, and FIG. 3 is a cross-sectional view showing another example of the arrester. Main body insulator...1, Locking step...2, Arrester storage part...3, Fuse tube storage part...4, Upper electrode...12, Rubber mold cone...15, 16,
26. Power supply side output wire... 17. Load side output wire...
18, Lower electrode...19, Fuse pipe...20,
Mounting bracket...21, Ground wire...25, Draining bracket...27, Earth side electrode...28, Charging side electrode...
...32, Nonlinear resistance element...33.

Claims (1)

[Scope of Claims] 1 The inner cavity of the cylindrical main body insulator is divided into upper and lower parts at the upper part, and the upper part is an arrester housing part, and the lower part is integrally formed as a fuse cylinder housing part, and the arrester housing part is filled with zinc oxide. An arrester having a non-linear resistance element such as an element is housed and fixed, and an upper electrode connected to the charging side electrode of the arrester is fixed in the inner part of the fuse barrel housing, and a lower electrode is fixed in the lower part of the fuse barrel housing. A ground wire is detachably connected to the ground side electrode of the arrester, one end of which is embedded in a rubber mold cone that is removably formed on the upper end of the main insulator and tightly fitted and fixed;
A cylindrical cutout with a built-in arrester, characterized in that a power supply side lead wire is connected to either one of the charging side electrode and the upper electrode of the arrester, and a load side lead wire is connected to the lower electrode. . 2. The cylindrical cut-out with a built-in arrester as set forth in claim 1, wherein the ground wire is provided with display means such as coloring to distinguish it from other lead wires.