JPH036980Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lightning disconnection prevention device that protects electric lines from disconnection and damage to insulators by capturing and discharging lightning surges.

Prior Art Conventionally, as shown in Fig. 1, in electric lines,
The base metal fitting 43 of the high-voltage insulator 42 is attached to a cross arm 41 fixed horizontally to a utility pole (not shown), a cap metal fitting 44 for discharging is fitted to the head, and the insulation coating 45a of the insulated wire 45 is peeled off. The exposed core wire 45b is pressed onto the cap fitting 44 using a holding fitting 46, and the insulating cover 4 is closed for safety.
7 covered the cap metal fitting 44 which is the discharge part. Therefore, when a lightning impulse overvoltage caused by a lightning strike or the like is applied to the insulated wire 45, the insulating cover 47 and the high voltage insulator 4 are damaged from the lower end of the cap fitting 44.
It flashes over to the base metal fitting 43 or the cross arm 41 through the gap with the second insulator fold 42a.

By the way, in the conventional device shown in the figure, since flashover occurs along the vicinity of the surface of the insulator 42, there is a defect that the high voltage insulator 42 is damaged by the follow-on arc accompanying the flashover.

In addition, in this conventional device, due to the presence of a gap between the insulating cover 47 and the insulator folds 42a, so-called bird damage often occurs when a bird perches on the cross arm 41 pecks the vicinity of the cap metal fitting 44 with its beak, resulting in a ground fault. Was.

Furthermore, when electrically connecting the cap fitting 44 to the insulated wire 45, the insulation coating 45a must be peeled off to expose the core wire 45b, which is troublesome and poses a safety risk, especially when working with live wires. Work efficiency was also low because maximum care was required to secure them.

Purpose of the invention The present invention was made in order to solve the above-mentioned problems, and its purpose is to facilitate the installation of a discharge electrode electrically connected to an insulated wire using a live wire. It does not require the installation of an insulating cover to hide the discharge electrode, and it can be used in the wire gripping method using bound wires, which is common on power distribution lines, and does not become an obstacle when repairing power lines. Furthermore, it is an object of the present invention to provide a lightning disconnection prevention device that is free from the risk of bird damage.

Structure of the Invention In order to achieve the above object, the present invention includes an annular fitting portion formed with an elastic insulating material so as to be able to fit into the insulator folds of a high voltage insulator holding an insulated wire, and an annular fitting portion formed so as to be able to fit into the insulator folds of a high voltage insulator holding an insulated wire; A support arm is constructed of a support arm that protrudes from the support arm and houses a discharge electrode therein, and the discharge electrode is electrically connected to the insulated wire, and the fitting part is provided with a support arm other than the protrusion of the support arm. The gist is that a split is provided at the position so that the fitting part can be opened to both sides against the elastic force of the fitting part.

Example Hereinafter, examples 2 to 7 that embody the present invention will be described.
To explain based on the figure, a high voltage insulator 2 having a base metal fitting 2a at the bottom is fastened to the upper surface of a cross arm 1 which is fixed horizontally to a utility pole (not shown).
An insulated wire 5 is bound between the insulator folds 2b and the head 2c of the insulator 2 by a bind wire 6.

A ring-shaped fitting part 7f of a support 7 made of an elastic insulating material such as rubber or synthetic resin is fitted and fixed to the insulator pleats 2b of the high-voltage insulator 2 by elastic force. A substantially L-shaped discharge electrode 8 electrically connected to the insulated wire 5 is provided in the support arm 7a that projects from the side of the fitting portion 7f so as to be spaced apart from the support arm 7a.
A screw or the like is screwed to the lower end of the electrode 8 to form a discharge end 30. The discharge electrode 8 is connected to the insulated wire 5 side via a lead wire 9 having one end of a core wire 9a caulked to its upper end and a connector 10 fixed to the insulated wire 5 at an appropriate distance from the high voltage insulator 2. electrically connected.

As shown in FIG. 6, the connector 10 includes bifurcated contact terminals 12 which are fixed and protrude from the lower end of an insulating base 11 having a substantially U-shaped cross section and housing an insulated wire 5 into a housing groove 11a. The core wire 5a of the insulated wire 5 is fitted into contact with the core wire 5a. That is, in the upper part of the insulating base 11, there is an insulating base 13 having a substantially inverted U-shaped cross section, and a protrusion 11c and a notch formed at the connecting portions of both bases 11 and 13 so that they do not separate from each other in both the upper and lower directions and in the line direction. 13a are formed and configured to engage with each other. The press rod 1 penetrates the insulating base 13 in the vertical direction by adjusting the screwing of the presser cap 14 screwed onto the upper part of the insulating base 13.
5, the wire holding member 16 presses the insulated wire 5 into the housing groove 11a. Therefore, the bifurcated tip end portion of the contact terminal 12 penetrates the insulation coating 5b of the insulated wire 5 and comes into contact with the core wire 5a.

Note that a washer 17 and a disc spring 18 are interposed between the insulating cap 14 and the upper end of the pressing rod 15, and a plate-shaped stopper 19 fixed on the wire holding member 16 is attached to the lower end of the pressing rod 15. It is latched to.

Then, as shown in FIGS. 6 and 7, the lead wire 9
A terminal 20 clamped onto the core wire 9a is fixed to the lower end of the contact terminal 12 within the skirt portion 11b of the insulating base 11 with a screw 21, and the skirt portion 11b is fitted with an insulating cap 22.

Now, in the installed state of the lightning disconnection prevention device shown in FIGS. 2 and 6, when a lightning impulse overvoltage caused by a lightning strike or the like is applied to the insulated wire 5, the contact terminal 12, the lead wire 9, which is in contact with the core wire 5a, and the discharge It flashes over from the discharge end 30 through the discharge hole 7b via the electrode 8, is captured by a grounding object such as the base metal fitting 2a or the arm 1, and is grounded via the arm 1 and a lead wire (not shown). . Furthermore, if a base cover 40 made of an insulating material is attached to the outer periphery of the upper edge of the base metal fitting 2a as shown in FIG. can be separated from the high voltage insulator 2. A follow-on arc occurs with this flashover, but since this arc is discharged away from the surface of the high-voltage insulator 2, the high-voltage insulator 2 will not suffer thermal damage from the arc. Further, the core wire 5a of the insulated wire 5 is electrically connected to the discharge electrode 8, and the follow-on arc is discharged from the discharge end 30, so there is no need to fix the arc at the core wire 5a, and disconnection can be reliably avoided. . Further, although there is a risk that the discharge electrode 8 may be thermally damaged by the following arc, this thermal damage is limited to only the discharge electrode 8, so it is certain that the insulated wire 5 itself will not be thermally damaged by the following arc. This can be avoided and there will be no disconnection.

Furthermore, if the support 7 is made of an insulating material and an air gap is provided between the discharge electrode 8 and the grounded object in consideration of insulation coordination with the high voltage insulator 2, flashover can be ensured. Since this occurs between the discharge electrode 8 and the grounded object, the high voltage insulator 2 is not damaged.

In this embodiment, the discharge electrode 8 is electrically connected to the insulated wire 5 via the lead wire 9 and the connector 10, but the connector 10 connects the discharge electrode 8 without stripping the insulation coating 5b of the insulated wire 5. The connector 10 can be electrically connected to the insulated wire 5, and the work of attaching the connector 10 to the insulated wire 5 is easy even when the wire is live, and the work is simple and labor-saving. For this installation work, connect the lead wire 9 to the contact terminal 12 in advance, and then attach the insulating base 11 to the
The insulated wire 5 is accommodated in the accommodation groove 11a of the insulated wire 5, and then the presser cap 14 is screwed and adjusted with the insulated base 13 fitted on the upper part of the insulated base 11, thereby completing the attachment of the connector 10 to the insulated wire 5. death,
The discharge electrode 8 and the insulated wire 5 are electrically connected. In this case, since the discharge electrode 8 is built into the support arm 7a of the support 7, there is no fear of electric shock due to the discharge electrode 8, and bird damage that would cause power transmission to be stopped can also be prevented. Since there is no need to install an insulating cover, etc., the work can be saved and the installation of the poles can be simplified.

By the way, in this embodiment, as shown in FIGS. 4 and 5, a split 7c is provided at a position opposite to the support arm 7a with respect to the annularly formed fitting portion 7f of the support 7.
is provided, and the fitting portion 7f can be opened to both sides against the elastic force of the fitting portion 7f.
A cutout 7d is provided on both outer sides between the support arm 7a and the support arm 7a to facilitate elastic deformation of the fitting portion 7f. Therefore, the fitting part 7f of the support 7 can be easily opened to both sides with the split 7c as a boundary, as shown by the chain line in FIG. Even in existing locations where the support tool 7c is supported, open the split 7c and
It can be attached by being elastically deformed and fitted into the insulator folds 2b from the side, and the attachment work is extremely easy because no modification is made to the insulated wires 5 or the binding wires 6. Of course, whether the discharge electrode 8 is not electrically connected to the insulated wire 5 or is electrically connected to it, this installation work is easy due to the insulating properties of the support 7. It is.

Further, since the support 7 is compactly fitted and fixed to the insulator folds 2b, it will not interfere with the work when repairing the electric line.

It should be noted that the present invention is not limited to the above-mentioned embodiment. For example, as shown in FIG.
The insulator folds 2b pass through the connecting pins 23 through a pair of connecting protrusions 7e protruding outward from the vicinity of both sides of the insulator folds 2b.
The fitting and fixing of the support tool 7 to the support member 7 may be made more secure. Further, the notch 7d may be formed in an appropriate shape other than that in the above embodiment, and furthermore, it is also possible to omit this notch.

Further, when electrically connecting the discharge electrode 8 to the insulated wire 5, it is also possible to use an appropriate connection means other than the connector 10.

Effects of the Invention As detailed above, the lightning disconnection prevention device of the present invention prevents electric shock because the discharge electrode electrically connected to the wire side is contained within the support arm of the insulating support. Installation work can be done with live wires without any fear, preventing bird damage, and eliminating the need to install an insulating cover to hide live parts, saving labor and simplifying pole mounting. Moreover, since the support can be elastically deformed by opening the annular fitting part to both sides at the split boundary, it is possible to easily attach the support to the insulator folds. Even for existing high-voltage insulators that are already supported by binding wires, by providing the above-mentioned split, installation work can be easily performed without modifying the insulated wires or binding wires. Since it is compactly fitted and fixed to the insulator folds, it has the excellent effect of not causing any obstruction when repairing the electric line.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a conventional lightning wire disconnection prevention device, Figs. 2 to 7 show an embodiment embodying the present invention, and Fig. 2 is a partially cutaway side view showing a high voltage insulator and connector. Figure 3 is a plan view of the high voltage insulator side.
Figure 4 is a plan view of the support, and Figure 5 is A- in Figure 4.
A sectional view taken along line A, Figure 6 is a sectional view taken along line B-B in Figure 2,
FIG. 7 is a sectional view taken along the line CC in FIG. 6, and FIG. 8 is a partially cutaway plan view showing another example of the support. 2...High voltage insulator, 2b...Insulator pleats, 5...Insulated wire, 7...Support, 7a...Support arm, 7
c...split, 7f...fitting portion, 8...discharge electrode.

Claims (1)

[Scope of claim for utility model registration] Insulator pleats 2 of high voltage insulator 2 holding insulated wire 5
b has an annular fitting part 7f formed with an elastic insulating material so that it can be fitted, and a support arm 7a that projects outward from the fitting part 7f and houses a discharge electrode 8 therein.
A support 7 is constructed from the above, and the discharge electrode 8 is electrically connected to the insulated wire 5, and the fitting portion 7f is provided with a fitting portion 7f at a position other than the protruding portion of the support arm 7a. Split 7c that can be opened to both sides against the elastic force
A lightning disconnection prevention device characterized by being provided with.