JPS58137935A - Cylindrical cutout internally containing arrester - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field This *W relates to a cylindrical cutout with a built-in arrester.

Conventional technology Conventionally, a cylindrical cutout with a built-in arrester is formed by forming a cylindrical part approximately in the center of a cylindrical body insulator that branches in a direction perpendicular to the cylindrical body insulator, and accommodating the arrester within the cylindrical part. In addition, a configuration was adopted in which the cylindrical main body insulator was made large in diameter and the fuse tube and arrester were housed in parallel.

However, with the cylindrical cut-out, the main body of the insulator itself becomes large, which poses problems in terms of weight and manufacturing.Moreover, the internal structure becomes complicated due to the attachment of the arrester.

Also 1. If you want to replace an existing cylindrical cutout that does not have a built-in arrester, which is widely adopted, with an arrester, you will have to replace it with a new cylindrical cutout that has a built-in arrester. There were problems in terms of work and economics.

Purpose This invention was made to solve the above problems, and its purpose is to simplify the assembly of the arrester to the main insulator, reduce the shape and weight of the main insulator, and To provide a cylindrical cutout with a built-in aretuce which can be easily assembled into an existing cylindrical cutout without a built-in cylindrical cutout.

EXAMPLE An example embodying this invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a cylindrical body insulator with a fuse tube insertion hole 2 provided inside, the upper end of the conical shape opening upward is the upper end surround, and the cylindrical shape opening downward. Bottom end down, end to end 1'l', :i; 4 Jl l,
-1-.

There is. 5 is a locking step formed in the upper end opening 3 of the main body insulator 1, and 6 is a support bolt fixed to the inner periphery of the step 5.

Reference numeral 7 designates a draining fitting screwed onto the tip of the support bolt 6, and 8 represents an upper electrode similarly attached to the base end of the support bolt 6. Reference numeral 9 denotes an arc extinguishing rod suspended from the base end of the support bolt 6 via a spring 10 within the upper electrode 8.

Reference numeral 11 denotes an upper mold cone fitted into the upper end opening 3 of the main body insulator 1, and a power supply side sunrise wire 12 is integrally molded therein. The inner end of the output wire 12 is caulked 13 to the draining fitting 1. Reference numeral 14 denotes a mounting bracket fixed to the outer periphery of the cylindrical main body insulator.

Reference numeral 15 denotes a lower electrode guide member inserted into the lower end opening 4 at the lower end of the fuse cylinder insertion hole 2, and a truncated conical guide portion 16 is formed on the lower inner periphery of the lower electrode guide member 15, and a truncated conical guide portion 16 is formed on the upper inner periphery. The lower electrode 18 is attached to the electrode support plate 11 by screws. A stopper 19 is screwed onto the upper end of the lower electrode guide member 15, and supports the lower end of the cylindrical arc-extinguishing cylinder 20 whose upper end is located directly below the upper electrode 8.

Reference numeral 21 denotes a fuse tube installed in the fuse tube insertion hole 2, and an upper contact 2111 at the upper end of the fuse tube is fitted between the upper electrode 8 and the arc extinguishing rod 9 so as to be removable and detachable. The contactor 21b is fitted onto the lower electrode 18 of the upper portion of the guide portion 16 so as to be able to come into contact with and separate from the lower electrode 18. Reference numeral 22 denotes a lower mold cone attached to the outer periphery of the lower end opening 4 of the main insulator 1, on which a load-side sunrise wire 23 is molded, and the inner end of the lead wire 23 is connected to the lower electrode 18.

Reference numeral 24 denotes a hook member attached to the inner surface of the lower end opening 4 of the main insulator 1, and a conductive stopper 25 provided around its circumference.
This removably locks a seal plug 26 that is tightly fitted into the tapered portion of the hook member 24. 27 is a hakama member 24
This is a string that connects the seal plug 26 and the seal plug 26.

28 is a cylindrical arrester formed by molding an insulating material 28b such as epoxy resin or ethylene propylene rubber (EPR) on the surface of a non-linear resistance element 28a such as zinc oxide (ZnO) having excellent non-linear resistance. The fuse tube 21 is fitted into the lower end opening 4 of the main insulator 1 so that the lower end of the fuse tube 21 is inserted into the cylinder. Reference numeral 29 denotes a hook formed obliquely and protruding downward at the center position of the outer peripheral surface of the arrester 28, and when the arrester 28 is inserted into the lower end opening 4 from below, the hook 29 connects to the upper end of the hook member 24. By being engaged with the edge, the arrester 28
is fitted and fixed to the hook member 24.

Further, as shown in FIG. 2, a contact electrode surface 30 is provided on the lower outer circumferential surface of the arrester 28, with the nonlinear resistance element 28a exposed, and the contact electrode surface 3o partially protrudes from the upper end of the stopper 25. The contact piece 25B is electrically connected to the contact piece 25B.

Reference numeral 31 denotes a contact plate attached to the upper end of the arrester 28, the base end surface of which is electrically connected to the non-linear resistance element 28a of the arrester 28, and the tip end connected to the lower electrode through the guide section 16. It is in electrical contact with 18. 3
Reference numeral 2 denotes an arcing horn whose base end is fixed to the mounting fitting 14, and whose distal end faces the lower end of the stopper 25 at a predetermined distance.

Now, - the cylindrical cutout configured as described above is such that even if a lightning surge enters the cutout, the arrester 28 will stop the stopper 25, the arcing horn 32 and the mounting bracket 14.
Since the cutout is discharged to the ground through the cutout, it not only protects the cutout itself from damage but also protects power distribution equipment such as a transformer connected via the load side sun wire 23 of the cutout from lightning surges.

Furthermore, since the cylindrical cutout configured as described above has a simple structure in which the arrester 28 is fitted into the hook member 24 attached to the lower end opening 4 of the main insulator 1 in a conventional cutout, installation is easy. It becomes easier. Moreover, even for cutouts that do not have an existing arrester 28 built-in, the arrester 28 can be installed without impairing the function and structure of the cutout.
8 can be assembled, streamlining the conversion work.

Note that the present invention is not limited to the above-described embodiment; for example, as shown in FIG. Alternatively, the lower outer circumferential surface of the arrester 2[ may be sandwiched between the inner surface of the hakama member 24 and the arrester 2
It is also possible to make arbitrary changes without departing from the spirit of the invention, such as by fixing or detachably fixing 8 to the facing member 24.

Effects As described in detail above, the present invention provides a cylindrical cutout in which a fuse tube is inserted into a fuse tube insertion hole formed in a cylindrical main insulator from the lower end opening of the main insulator. By fitting and fixing the arrester inside the main body insulator, and by bringing the contact plate provided on the arrester into contact with the lower electrode of the cutout, it is possible to assemble the arrester to the main insulator without damaging the shape, function, and structure of the cutout. The present invention has an excellent effect in that it can be simplified without being overloaded, and can be easily assembled into an existing cutout without a built-in arrester.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a cylindrical force/nodout embodying the present invention, FIG. 2 is an overall perspective view of the arrester, and FIG. 5 is a perspective view of an arrester showing another example of the invention. Main body insulator 1, fuse tube insertion hole 2, lower end opening 4, lower electrode 18, fuse tube 21, hook member 24, stopper 25, seal plug 26, arrester 28, nonlinear resistance element 28a
, insulating material 28b1 hook 29, contact electrode surface 30, contact plate 31, ground wire 33゜Patent applicant - Takamatsu Electric Co., Ltd. Representative Patent attorney Hironobu Onda

Claims (1)

[Scope of Claims] 1. In a cylindrical cutout in which a fuse tube is inserted into a fuse tube insertion hole formed in a cylindrical main insulator from a lower end opening of the insulator, an arrester is provided inside the lower end opening of the main insulator. A cylindrical cutout with a built-in arrester, characterized in that the arrester is fitted and fixed, and a contact plate provided on the arrester is brought into contact with the lower electrode of the cutout. 2. The arrester according to claim 1, wherein the arrester is a cylindrical non-linear resistance element with excellent non-following current characteristics, the surface of which is molded with an insulating material such as epoxy resin or ethylene propylene rubber. Cylindrical cutout with built-in. 8 The arrester has a hook protrudingly formed on its outer surface, and the hook engages with the upper end of the hook member installed in the lower end opening of the main insulator, and the arrester is connected to the lower end of the main insulator through the hook member. A cylindrical cutout incorporating an arrester according to claim 2, which is attached to an opening. 4. The arrester has a contact electrode shaped on the outer surface of its lower end so as to be brought into contact with a part of the stopper for locking the seal attached to the hook member.
Cylindrical cutout with built-in arrester as described in section. 5. A cylindrical cutout with a built-in arrester according to claim 8, wherein the arrester has a ground wire connected to its lower end.