JPH0314905Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) The present invention relates to a lightning disconnection prevention device that discharges lightning surges and protects electrical lines from disconnection and damage to insulators caused by follow-on arcs. ,For more information,
It is particularly suitable for use in salt-damaged areas with heavy snowfall.

(Prior Art) Conventionally, as shown in FIG. 8, the head of a clamp-top insulator 51 that is erected and fixed on a cross arm 1 is used to protect the electric line from lightning surge discharge and accompanying discharge. Cap metal fitting 52 for discharge covered with
and the wire holding fitting 53, the insulation coating 54a is
The core wire 54b of the stripped insulated wire 54 was held and the insulating cover 55 was attached.

On the other hand, in areas affected by salt, when the surface of the insulator becomes wet and contaminated and the surface leakage current increases, a spark discharge occurs, which can ignite and spread the fire to the insulating cover of the live part, and cause tracking to the insulating coating of the electric wire. Therefore, instead of the above-mentioned clamp-top insulator 51, the cap 5 of the main body insulator 56 is used as shown in FIG.
A snow-salt-resistant insulator with a salt-resistant plate 57 that blocks dust and rainwater from blowing into the opening 6a was used.

(Problem to be solved by the invention) However, the clamp-top insulator 5 shown in FIG.
1 is a problem in that large birds such as crows land on the cross arm 1 and touch live parts through gaps in the insulating cover 55 to eat insects or wipe their beaks, causing ground faults and frequent line failures. It was hot.

In addition, since the salt damage insulator shown in FIG. 9 has the main body insulator 56 upright, the opening of the salt-resistant pan 57 faces upward, so that flying objects may not get caught in the salt-resistant pan 57 or dust may accumulate inside. However, there was a problem in that the entire insulator was susceptible to unexpected insulation deterioration. Furthermore, if a lightning surge enters the railway line and the insulator flashes over,
The gap between the outer surface of the main body insulator 56 and the inner surface of the salt-resistant dish 57 served as a discharge path, and the inside of the cap 56a was exposed to the arc emitted from the grounding fitting, causing damage to the insulator. Furthermore, in areas with heavy snowfall, snow may accumulate on the inner surface of the salt-resistant plate 57, shielding it from sunlight and wind, and there is a risk that the salt-resistant plate and the main insulator may be damaged due to volume expansion during freezing. It was hot.

The object of the present invention is to provide a lightning disconnection prevention device equipped with a snow and salt damage resistant insulator that solves the above-mentioned conventional problems.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an electrode cover made of an insulating material for the insulated wires near the insulator where the insulated wires are tied together with a bind wire. Attach the covered energizing side discharge electrode and extend it diagonally downward, and at the same time attach the grounding side electrode to a grounding object such as an arm arm and extend it diagonally upward to face the energizing side discharge electrode. , on the other hand, a main insulator which is formed by closing at one end of at least two cylindrical bodies of different diameters arranged concentrically, a pin fitting fixed to the lower end of the main insulator, and an inside of the shade of the main insulator. has a cylindrical body part inserted and disposed so as to overlap the cylindrical body from below,
and a pot-shaped salt-resistant dish that has a shielding part on the outer peripheral surface of the cylindrical body part that covers the space inside the shade between the cylindrical body part and the cylindrical body, and the pot-shaped salt-resistant dish that is integrally attached to the pin fitting of the main body insulator. A method is adopted in which the insulator is constituted by the fixing metal fittings to be attached.

(Function) The present invention adopts the above-mentioned means, so that even if a bird rides on the ground side electrode 22 and tries to touch the lower end of the energized side discharge electrode 11, the electrode cover 17 prevents the bird's beak from touching the charging part. ground faults are prevented. In addition, dust and rainwater are prevented from blowing into the inside of the shade 25ab of the insulator 2, and
Since the shielding part can prevent sprayed rainwater from entering the space inside the hat, moisture contamination inside the hat 25ab can be prevented, surface leakage current can be suppressed, and the salt-resistant dish 28
Since the upper end opening is covered, the accumulation of flying objects, dust, and snow is prevented.

(Example) Below, an example embodying the present invention is shown in Figure 1~
To explain based on FIG. 5, in the drawing, 1 is a cross arm fixed horizontally to a utility pole (not shown), and 2 is a detailed explanation after the cross arm 1 is fastened and fixed to the upper surface of the arm 1 with a pin fitting 3 and a nut 4. It is a tight-shaped insulator. A mounting plate 5 for mounting a ground electrode 22, which will be described later, is interposed between the arm 1 and the nut 4. 6
is an insulated wire bound to the upper part of the tight-shaped insulator 2 by a bind wire 7.

Reference numeral 8 denotes a power supply side horn unit mounted on the insulated wire 6 at a predetermined distance L3 from the binding wire 7, and includes a pair of clamps clamped to the core wire 6b exposed by peeling off the sheath 6a of the insulated wire 6. Fittings 9, 10
and a discharge electrode 11 attached to the shaft attachment parts 9a and 10a of the clamping fittings 9 and 10 and extending diagonally downward,
The core wire 6b, the clamping fittings 9 and 10, and the discharge electrode 1
Insulating compound 12 coated on the proximal end of 1
and an approximately oval cylindrical insulating cover 13 fitted onto the insulated wire 6 so as to cover its outer periphery.

As shown in FIGS. 2 and 3, a through hole 9b is formed in the shaft attachment part 9a of the clamping metal fitting 9, a screw hole 10b is formed in one of the pair of shaft attachment parts 10a of the clamping metal fitting 10, and a screw hole 10b is formed in the other. A through hole 10c having the same diameter as the through hole 9b is formed. A threaded portion 11a and a shaft portion 11b having a smaller diameter than the threaded portion 11a are provided at the base end of the discharge electrode 11.
is formed. and the two clamping fittings 9,
10 inserts the shaft portion 11b into the through holes 9b and 10c of the clamping fittings 9 and 10, and inserts the threaded portion 11a into the screw hole 1.
0b, it can be opened and closed around the shaft part 11b, and the core wire 6b
It is tightened and fixed. Further, a locking nut 16 for fixing the electrode 11 to the shaft attachment part 10a is screwed into the threaded part 11a of the discharge electrode 11.
The outer periphery of the electrode 11 is covered with an electrode cover 17 made of an insulating material, and the tip of the electrode 11 is formed into a small-diameter discharge hole 18a of an insulating sleeve 18 fitted into the tip of the cover 17 so that the beak of a bird or the like cannot enter. It is exposed in a deep place.

As shown in FIG. 2, the insulating cover 13 is formed with a hinge portion 13a, which is opened around the hinge portion 13a when fitted onto the insulated wire 6, as shown by the two-dot chain line in the figure. It is becoming more and more like this.
Also, a pair of ears 13 are provided at the lower end of the insulating cover 13.
b is formed, and a locking pin 19 is attached to one ear portion 13b.
The insulating cover 13 is fixed to the insulated wire 6 by inserting the locking pin 19 into a locking hole 13c formed in the other ear portion 13b. Further, the ends of the insulating cover 13 are formed into a small diameter shape as shown in FIG. 1, and a winding tape 20 is attached to the outer periphery thereof.

21 is a support bolt fixed to the lower surface of the mounting plate 5, and 22 is a support bolt fixed to the lower surface of the mounting plate 5;
This is a cap nut-shaped ground side electrode screwed so as to extend diagonally upward facing the discharge electrode 11, and the air gap L1 with the discharge electrode 11 can be adjusted by adjusting the screwing amount. There is. A locking nut 23 for fixing the ground side electrode 22 is provided on the support bolt 21.
are screwed together. Further, the outer periphery of the ground side electrode 22 is covered with an electrode cover 24 made of an insulating material.

In this embodiment, the air gap L1 between the electrodes 11 and 22, the distance L2 between the grounding object (fixing fitting 27 of the insulator 2 described later) and the insulated wire 6, and the distance between the tip of the binding wire 7 and the sandwich The distance L3 to the mounting position of the fittings 9 and 10 is set to the relationship L1<L2<L3, so that discharge occurs between the charging side discharge electrode 11 and the grounding side electrode 22.

Next, the tight-shaped insulator 2 will be explained in detail. 25 is a cylindrical body 25 having different diameters.
A and 25b are arranged concentrically and the upper ends are closed to form a shade 25ab.The top of the insulator is provided with a wire groove 25c for engaging the insulated wire 6, and an insulating fold is provided in the middle. 25d is provided. 2
Reference numeral 6 denotes a base metal fitting fitted and fixed to the lower end of the main body insulator 25 with cement, and 27 is a fixing metal fitting for attaching a salt-resistant plate that is clamped and fixed between the arm 1 and the base metal 26. On the outer periphery, there are a plurality of (6 in this example, 6 as shown in Fig. 4) arranged at equal angles.
) projecting edges 27a are formed, and each projecting edge 27a
A clamping tongue piece 27b is formed between each of them. Reference numeral 28 denotes a pot-shaped salt-resistant dish held by the fixing metal fitting 27. A through hole 28a is provided at the bottom of the dish for fitting the base metal fitting 26, and the respective clamps are provided near the outside of the through hole 28a. Tongue piece 27b
A plurality of (six) locking holes 28b are transparently provided so as to correspond to the above. Then, each of the clamping tongues 27b is bent upward and penetrates each of the locking holes 28b, and the upper end of each clamping tongue 27b is bent horizontally toward the base metal fitting 26. , a pot-shaped salt-resistant dish 28 is attached to the fixing fitting 27.
is retained.

The cylindrical body part 28c of the pot-shaped salt-resistant dish 28 is inserted from below between a pair of cylindrical bodies 25a and 25b located inside the shade 25ab of the main body insulator 25, that is, on both the inside and outside sides, and overlapped with the cylindrical body 25a. An in-shade space R1 is formed between and the cylindrical body part 28c, and an in-shade space R2 is formed inside the cylindrical body part 28c.
The cylindrical body portion 28c is preferably disposed near the inner wall of the outer cylindrical body 25a, and
The same applies when there are three or more a, 25b, . . . .

A shielding portion 28d is integrally formed on the outer circumferential surface of the cylindrical portion 28c of the pot-shaped salt-resistant dish 28 to suppress dust and rainwater from blowing into the shade interior space R1.

Next, the operation of the lightning disconnection prevention device configured as described above will be explained.

Now, when the lightning impulse overvoltage caused by a lightning strike is applied to the insulated wire 6 in the installed state of the lightning disconnection prevention device shown in FIG. It flashes over from the side discharge electrode 11 through the discharge hole 18a, is captured by the ground side electrode 22, and is grounded via the arm 1 and a lead wire (not shown). A follow-on arc occurs with this flashover, but since this arc flows away from the surface of the tight-shaped insulator 2, the insulator 2 is not thermally damaged by the follow-on arc. The follow-on arc is captured by the ground-side electrode 22 discharged by the energized discharge electrode 11, and since the follow-on arc is not fixed to the core wire 6b, wire breakage due to melting is prevented.

In this embodiment, the power supply side horn unit 8 is mounted on the insulated wire 6 at an appropriate distance from the insulator 2, and the tip of the power supply side discharge electrode 11 of the horn unit 8 is attached to the insulating sleeve 18 that covers the electrode 11. While exposing the deep position of the formed discharge hole 18a,
Since the outer periphery of the ground side electrode 22 is covered with an electrode cover 24 made of an insulating material, birds etc. do not touch the live parts with their beaks, and since the ground side electrode 22 is also protected by insulation, birds etc. Even if it stops, a ground fault will not occur. In addition, since the length of the ground side electrode 22 can be adjusted appropriately, the insulated wire 6
The air gap L1 can be easily adjusted with respect to the lowering angle and horizontal angle.

Furthermore, in the embodiment described above, the distance L3 above the insulation coating 6a of the insulated wire 6 from the tip of the binding wire 7 to the mounting position of the clamping fittings 9 and 10 is maximized.
In the soiled state, the insulation coating 6a, the binding wire 7,
Surface leakage current flowing through the insulator 2 to a grounded object such as the cross arm 1 is suppressed, which is effective in preventing tracking of the insulation coating 6a. Also, birds etc. are arm gold 1.
Even if the wire stops and the bind wire 7 is touched, the current will not flash over the insulated wire 6 from the clamping fittings 9 and 10 and flow to the bind wire 7, and no ground fault will occur.

Furthermore, the aesthetic appearance of the pillar can be improved compared to the conventional method in which a discharge clamp is attached to the head of the insulator.

On the other hand, in the embodiment described above, the cylindrical body part 28c of the pot-shaped salt-resistant dish 28 is stacked from below at a predetermined distance from the cylindrical bodies 25a and 25b inside the shade 25ab of the main insulator 25 constituting the tight-tip insulator 2. As a result, dust and rainwater are prevented from blowing into the space inside the hat, and dust and rainwater are completely blocked from blowing into the inside space R2 located inside the cylindrical part 28c. Further, a shielding portion 2 is provided on the cylindrical portion 28c.
8d, it is also possible to shield the space R1 inside the hat. Therefore, even against the scattering of spray-like rainwater during the typhoon season, the shielding portion 28d protects the interior space R of the shade.
It is possible to prevent spray rainwater from entering 1.
The sprayed rainwater adheres to the lower surface of the shielding part 28d, turns into water droplets, and falls to the outside, so that excellent protection against moisture stains can be maintained. Furthermore, the upper end opening of the pot-shaped salt-resistant dish 28 is connected to the cap 25 of the main body insulator 25.
Since it is completely hidden inside the AB, dust will not accumulate on the pot-shaped salt-resistant dish 28 and flying objects will not get caught, and even during snowy conditions,
Since snowfall does not accumulate inside the salt pan 28, there is no possibility of unexpected insulation deterioration or damage.

(Another Example) Next, another example of the present invention will be described with reference to FIGS. 6 and 7. Components similar to those in the above embodiment will be designated by the same reference numerals, and their explanation will be omitted.

A connector 30 is attached to the insulated wire 6 without peeling off the insulation coating 6a, and is provided so as to protrude through and penetrate into the accommodation groove 31a from the lower end of the insulating base 31, which accommodates the insulated wire 6 and has a substantially U-shaped cross section. The fixed bifurcated contact 32 is configured to penetrate and come into contact with the core wire 6b of the insulated wire 6. Reference numeral 33 denotes an insulating base having a substantially U-shaped cross section fitted onto the upper part of the insulating base 31, which cannot be separated upwardly, and has a protrusion 31c and a notch 33a formed at the connecting portions of both bases 31 and 33, respectively. It is fitted in such a way that it cannot slide in the track direction. A presser cap 34 made of an insulating material is screwed onto the upper part of the insulating base 33, and by adjusting the threading of the cap 34, an electric wire made of an insulating material is inserted through a press rod 35 that vertically penetrates the insulating base 33. The holding member 36 holds the insulated wire 6 in the housing groove 3.
It is adapted to be pressed into contact with the inside of 1a. Therefore, the forked tip end portion 32a of the contactor 32 penetrates the covering portion 6a of the insulated wire 6 and comes into contact with the core wire 6b.

Note that a washer 37 and a disc spring 38 are interposed between the presser cap 34 and the upper end of the presser rod 35, and a plate-shaped stopper 39 fixed on the wire presser member 36 is attached to the lower end of the presser rod 35. It is attached to the section.

Then, as shown in FIG. 7, the base end portion of the energizing side discharge electrode 11 is inserted into the insertion hole 32b of the contact 32 and fixed with a screw 40, and the skirt portion 31
An insulating cap 41 is fitted to b.

In this embodiment, in addition to the effects of the previous embodiment, the electrical connection between the discharge electrode 11 and the insulated wire 6 can be made without stripping off the covering part 6a of the insulated wire 6, so that it is safe to use a live wire. The connector 30 can be attached to the insulated wire 6 at the same time.

Effects of the invention As detailed above, the present invention provides a discharge electrode on the charging side covered with an electrode cover made of an insulating material to the insulated wire near the snow and salt damage resistant insulator, which is tied with a bind wire. At the same time, the grounding side electrode is attached to a grounding object such as a arm arm and extending diagonally upward to face the energized side discharge electrode, thereby preventing ground faults caused by bird damage. It has an excellent effect of preventing accidents.

Further, the present invention provides at least two concentrically arranged
Cylindrical bodies of different diameters are closed at one end to form a shade of the main insulator, and the shade has a cylindrical body part inserted and disposed inside the shade so as to overlap the cylinder body from below. In addition to preventing dust and rainwater from blowing into the cylindrical body, the structure also includes a shielding part on the outer circumferential surface of the cylindrical body that covers the space inside the shade between the cylindrical body and the cylindrical body. Even when sprayed rainwater is scattered, the shielding part can prevent sprayed rainwater from entering the space inside the hat, and protect the space inside the hat from moisture and pollution. It has an excellent salt shielding effect in salt-damaged areas with snow accumulation, and has the excellent effect of completely suppressing surface leakage current.

Furthermore, the upper opening of the salt-resistant bowl is completely hidden inside the shade of the main insulator, which prevents flying objects from getting caught in the salt-resistant bowl, and prevents dust and snow from entering the salt-resistant dish. Since it will not accumulate on
This has the effect of preventing unexpected insulation deterioration and damage, maintaining reliability over a long period of time, and contributing to the safe supply of electric power.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, in which Figure 1 is a sectional view showing the entire lightning disconnection prevention device, and Figure 2 is a line taken along line A-A in Figure 1. 3 is a sectional view of the main part, and FIG. 4 is B- in FIG. 1.
5 is a sectional view taken along line B, and FIG. 5 is a sectional view taken along line C-C in FIG.
Fig. 6 is a sectional view showing another example of the connector, Fig. 7 is a sectional view taken along line D-D in Fig. 6, Fig. 8 is a partially cutaway front view showing a conventional crank top insulator, and Fig. 9 is a conventional FIG. 2 is a partially cutaway front view showing the salt damage resistant insulator of FIG. 1... Bracelet, 2... Tight-tip pin insulator, 3
... Pin fitting, 6 ... Insulated wire, 9, 10 ... Clamping fitting, 11 ... Charge side discharge electrode, 12 ... Insulating compound, 13 ... Insulating cover, 17, 24
... Electrode cover, 18 ... Insulation sleeve, 18a
...Discharge hole, 21...Support bolt, 22...Ground side electrode, 25...Main insulator, 25a, 25b...
Cylindrical body, 25ab...Cap, 27...Fixing metal fittings, 2
7a... projecting edge, 27b... clamping tongue piece, 28...
Pot-shaped salt-resistant dish, 28b...locking hole, 28c...cylindrical body part, 30...connector, 31, 33...insulating base, 32...contact terminal, 40...screw, 41...
Insulated cap.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A charging side discharge electrode 11 covered with an electrode cover 17 made of an insulating material is attached to the insulated wire 6 near the insulator 2 where the insulated wire 6 is tied with a bind wire 7. At the same time, the ground side electrode 22 is attached to a grounding object such as the cross arm 1 and extends diagonally upward to face the energized side discharge electrode 11, while concentrically At least two cylindrical bodies 25a and 25b of different diameters are closed at one end to form a shade 2.
5ab, a pin fitting 3 fixed to the lower end of the main insulator 25, and are inserted and disposed inside the shade 25ab of the main insulator 25 so as to overlap with the cylindrical bodies 25a and 25b from below. A shielding part 2 having a cylindrical body part 28c and covering the space R1 in the shade between the cylindrical body part 28c and the cylindrical body 25a on the outer peripheral surface of the cylindrical body part 28c.
8d; and a fixing fitting 27 that integrally attaches the pot-shaped salt-resistant plate 28 to the pin fitting 3 of the main insulator 25. Device. 2. The energizing side discharge electrode 11 is attached to the lower end shaft attachment parts 9a, 10a of the clamping fittings 9, 10 which are clamped to the core wire 6b of the insulated electric wire 6. Claim 1 of the Utility Model Registration Claims Lightning disconnection prevention device. 3. The lightning disconnection prevention device according to claim 1, wherein the length of the ground side electrode 22 is adjustable by means of a support bolt 21 and a nut 23. 4. The lightning disconnection prevention device according to claim 1 or 3, wherein the ground side electrode 22 has an electrode cover 24 made of an insulating material on its outer peripheral surface. 5 An air gap L1 between the discharge electrode 11 and the ground electrode 22, a distance L2 between the insulated wire 6 and the ground object, and between the tip of the bind wire 7 and the mounting position of the clamping fittings 9 and 10. The distance L3 is L1
The lightning disconnection prevention device according to claim 1 or 3 of the utility model registration claim, where <L2<L3. 6. The lightning disconnection prevention device according to claim 1, wherein the power-supplying side discharge electrode 11 is attached to a contact terminal 32 that penetrates the covering portion 6a of the insulated wire 6 and contacts the core wire 6b. .