JPS6031146Y2 - Cylindrical cutout with built-in arrester - Google Patents

Description

[Detailed description of the invention] This invention relates to a cylindrical cutout with a built-in arrester.

This invention has a storage recess and a draw-out hole that communicates with the lumen at a position slightly eccentric to the axis of the fuse casing on the upper surface of a cylindrical body insulator having an lumen for accommodating the fuse casing. The arrester element is stored in the storage recess, and a lead-out conductor fixed to an upper electrode fixed to the top of the inner cavity is inserted into the lead-out hole, and is fixed to the upper end of the main body insulator. The charging side and lead-out conductor of the arrester element are connected to the installed power supply side Hiji wire, and the ground connection conductor connected to the earth side of the arrester element is led out from the circumferential side of the main insulator. By providing a lead-out hole that communicates with the bottom of the storage recess, the arrester element can be built into the main body insulator compactly, the wiring to the charging side of the arrester element can be simplified, and the cutout can be installed on a telephone pole or the like. It is an object of the present invention to provide a cylindrical cutout with a built-in arrester that facilitates connection of the ground side of the arrester to a mounting bracket for mounting.

Hereinafter, a first embodiment of this invention will be described with reference to FIG. 1. The main body insulator 1 of this embodiment has a cylindrical shape with a lid, and a side groove 3 is formed on one side of the inner cavity 2 formed along the sour axis. Recessed,
A pullout hole 4 communicating with the top surface of the main body insulator 1 is transparently provided in the ceiling surface of the side gutter 3.

A threaded cylinder 6 is fixed by cementing to a mounting portion 5 recessed in the center of the ceiling surface of the inner cavity 2, and a connecting bolt 7 is screwed into the threaded cylinder 6 from below.

A connecting fitting 8 and a stabilizing fitting 9 are screwed between the head of the connecting bolt 7 and the threaded cylinder 6, and a connecting fitting 8 and a stabilizing fitting 9 are fixedly installed in the lower part of the inner cavity 2 between the head and the stabilizing fitting 9. Lower electrode 10
The upper electrode 11 corresponding to the upper electrode 11 is loosely fitted and locked so as to be swingable.

A fuse tube 12, which is held at the axial center position of the main body insulator 1 by both electrodes 10.11, is replaceably installed between the two electrodes 10.11, and one side of the connection fitting 8 has a pull-out hole 4. is inserted into the side gutter 3 so as to close the lower end thereof, and is brought into contact with the ceiling surfaces of the inner cavity 2 and the side gutter 3 via the lower gasket 13, and is inserted into the pull-out hole 4 at the negative side thereof. A draw-out bolt 14 serving as a draw-out conductor whose tip end is drawn out upward from the draw-out hole 4 is screwed.

A suspension spring 16 for suspending the arc extinguishing rod 15 is hung between the head of the connecting bolt 7 and the upper electrode 11, and a lower connecting terminal 17 is connected to the lower electrode 10. A load lead wire 18 is connected to the terminal.

On the other hand, on the upper surface of the main insulator 1, on the side opposite to the pull-out hole 4, there is formed a storage recess 19 with a circular planar cross section.
A vertical hole 20 parallel to the axis of the main insulator 1 is bored in the bottom surface of the main insulator 1 on the side opposite to the pull-out hole 4 .

Further, a cylindrical projection 21 is protruded at a position corresponding to the bottom of the vertical hole 20 on the circumferential side of the main insulator 1, and the inner end of a lead-out hole 22 bored in the center of the cylindrical projection 21 is connected to the vertical hole 20. is connected to the bottom of the

The lead-out hole 22 is formed along a straight line perpendicular to the axis of the main insulator 1, and as is clear from the above description, the lead-out hole 4 and the storage recess 19 are formed along a straight line perpendicular to the axis of the main insulator 1. It is shaped in a slightly eccentric position.

Inside the storage recess 19 are a ground electrode 23 having a disk shape, an arrester element 24, a terminal plate 25 made of soft metal that is in contact with the upper and lower end surfaces of the arrester element 24, and
Compression springs 27 with flexible conductors 26 wound around and connected between the upper and lower ends are housed in a stacked manner, and are pressed against each other by a charging side electrode 29 having a threaded rod 28 protruding from the center of the upper surface.

The electrode plate 29 is brought into contact with the upper surface of the main insulator 1 via the upper gasket 30, and the tightening nut 3 is screwed onto the tip of the draw-out bolt 14 passing through the electrode plate 29.
1 to the main body insulator 1.

A water cutter fitting 33 which is caulked to one end of the power supply side lead line 32 is screwed onto the threaded rod 28 of the charging side electrode 29, and one end of the power supply side lead wire 32 and the water cutter fitting 33 are integrally connected. The rubber mold cone 34 to be molded is the main body insulator 1
The molded cone 34 is tightly fitted and fixed to the upper end in a watertight manner, and an annular groove 35 for escaping from the tightening nut 31 is formed in the lower surface of the molded cone 34 .

The arrester element 24 is formed by laminating an appropriate number of non-linear resistance elements having excellent non-following current characteristics, such as zinc oxide elements, in series, and has a charging side electrode plate 2 on the charging side.
9 is connected, and the ground side electrode 23 is connected to the ground side thereof.

Further, if there is no need to consider replacing the arrester element 24, the molded cone 34 may be adhesively fixed to the main insulator 1 to further secure the tight fit and attachment.

A grounding plate part 36 is formed on the lower surface of the grounding side electrode 23 and is suspended into the vertical hole 20, and a screw hole 37 is formed in the lower end of the grounding plate part 36.

Further, a mounting bracket 38 for attaching the main body insulator 1 to a reading board such as a telephone pole is attached to a position corresponding to the cylindrical protrusion 21 on the circumferential side of the main insulator 1, and an arrester ground formed on the mounting bracket 38 is attached. An earth bolt 40 is fastened to the connection portion 39 as a connection conductor for earth, which is screwed into the screw hole 37 of the earth side electrode 23 through the lead-out hole 22 .

Then, the cylindrical projection 21 and the arrester ground connection portion 39
Nut 4 screwed onto earth bolt 40 between
1 is a gasket 4 interposed between it and the cylindrical projection 21.
2 and the washer 43 keep the outer end of the outlet hole 22 watertight, and the ground plate part 36 is fixed to the main insulator 1.

Now, the cutout configured as described above forms a storage recess 19 at a position slightly eccentric to the axis of the fuse tube 12 on the upper surface of the main insulator 1, and the storage recess 19
Since the arrester element 24 is housed in the main body insulator 1, the arrester element 24 can be built compactly into the main insulator 1, and the wiring for the charging side of the arrester element 24 is such that the charging side electrode 29 is connected to the upper electrode 11. Since it can be shared, it can be simplified.

Furthermore, a lead-out hole 22 is formed on the circumferential side of the main body insulator 1, and a ground bolt 40 connected to the ground side of the arrester element 24 is led out from the lead-out hole 22, so that connection to the mounting bracket 38 is simple. become.

In addition, if lightning surge enters from the power supply side exit wire 32,
The arrester element 24 connects the lightning surge to the earth bolt 40,
Since it is grounded to the ground via the mounting bracket 38 and the reading board,
Not only the cutout itself but also power distribution equipment such as a transformer connected via the load line 18 are protected from the lightning surge.

Also, as in this embodiment, the earth bolt 40 is attached to the mounting bracket 3.
8 and can be directly connected to the mounting bracket 38, the ground side of the arrester element 24 can be connected to the mounting bracket 38 very easily.

Next, a second embodiment of this invention will be described with reference to FIG.

However, the same reference numerals are given to the same or corresponding parts as in the first embodiment, and the explanation thereof will be omitted.

In this embodiment, a spherical discharge electrode 46 is formed at the lower end of the earth plate portion 36 of the earth side electrode 23, and the discharge electrode 46 corresponds to the lead-out hole 22, and a spherical discharge electrode 47 is formed at the tip of the earth bolt 40. Both electrodes 46.4
7 with a predetermined discharge gap, and its earth bolt 40 is screwed into a mounting threaded cylinder 48 fixed to the outer end of the outlet hole 22 by cementing so as to be movable forward and backward.

As described above, this invention is based on the fact that, on the upper surface of a cylindrical body insulator having an inner cavity for accommodating the fuse cylinder, there are four storage parts and the inner cavity located at a position slightly eccentric to the axis of the fuse cylinder. An arrester element made of a non-linear resistance element such as a zinc oxide element is housed in the storage recess, and the extraction hole is connected to an upper electrode fixed at the top of the inner cavity. Insert the lead-out conductor
The charging side and lead-out conductor of the arrester element are connected to the power supply side Hide wire fixedly installed on the upper end of the main body insulator, and the ground connection conductor is connected to the ground side of the arrester element on the circumferential side of the main body insulator. By providing a lead-out hole that communicates with the bottom of the storage recess so as to lead out the arrester element, the arrester element can be built compactly into the main insulator, and the wiring to the charging side of the arrester element can be simplified. This is a practically preferable idea as a cylindrical cutout with a built-in arrester because it has the effect of making it easier to connect the ground side of the arrester to a mounting bracket for attaching the cutout to a utility pole or the like.

Note that this invention is not limited to the above-mentioned embodiments, and for example, the shape of the storage recess 19 may be formed so that the plane cross section is fan-shaped, or a plurality of charging side electrode plates 29 may be provided on the main insulator 1. Any changes can be made without departing from the spirit of the invention, such as fixing the drawer bolts 14 attached to the drawer holes 4 formed, changing the shape and structure of each part, etc.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing a first embodiment of this invention, and FIG. 2 is a front sectional view showing a main part of the second embodiment. Main body insulator 1, inner cavity 2, extraction hole 4, connection fitting 8, lower electrode 10, upper electrode 11, fuse tube 12, extraction bolt 14
, load outlet wire 18, storage recess 19, vertical hole 20, lead-out hole 2
2. Earth side electrode 23, arrester element 24, charging side electrode plate 29, power source side lead wire 32, rubber mold cone 34,
Mounting bracket 38, earth bolt 40°

Claims (1)

[Scope of utility model registration request] On the upper surface of the cylindrical body insulator having an inner cavity for storing the fuse cylinder, a storage recess and a pull-out hole communicating with the inner cavity are formed at a position slightly eccentric to the axis of the fuse cylinder. An arrester element made of a non-linear resistance element such as a zinc oxide element is stored in the storage recess, and a lead-out conductor connected to an upper electrode fixed to the inner top of the lumen is inserted into the lead-out hole. The charging side and lead-out conductor of the arrester element are connected to the power supply side lead wire fixed to the upper end of the main body insulator, and the ground connection conductor is connected to the ground side of the arrester element on the circumferential side of the main body insulator. A cylindrical cutout with a built-in arrester, characterized in that an outlet hole is provided that communicates with the bottom of the storage recess so that the arrester is guided out.