JPH0793066B2 - Suspended lightning arrester device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents ground fault accidents by immediately grounding a high voltage caused by a lightning strike when it is applied to a transmission line and by shutting off a follow-up arc that occurs thereafter. The present invention relates to a suspended lightning arrester device.

[0002]

2. Description of the Related Art As a conventional suspension type lightning arrester device, FIG.
As shown in FIG. 3, a large number of suspension type lightning protection insulators 23 are connected in series via a suspension metal fitting 22 to a support arm 21 provided on a steel tower, and a suspension metal fitting 24 is provided at the lowermost end of the lightning protection insulator 23. It supports the power line L. Further, as shown in FIG. 6, the insulator main body 25 constituting the lightning protection insulator 23 includes a cap portion 25a, and a plurality of concentric pleats 25b formed in an annular shape on the inner surface of the cap portion 25a. Further, the cap portion 25a is integrally formed with a cylindrical head portion 25c with a lid integrally formed in the upper center part. Furthermore, a cap metal fitting 27 is fitted and fixed to the outer periphery of the head portion 25c by cement 26, and an engaging recess 27a is formed in the metal fitting 27 so that the pin metal fitting 28 of the lightning protection insulator 23 directly above can be engaged. I have to. The upper portion of the pin fitting 28 is fixed to the inside of the head portion 25c by cement 26, and the lower end thereof is engaged with the fitting recess 27a of the lightning protection insulator 23 directly below. In this way, the plurality of lightning protection insulators 23 are connected in series. Further, two cylindrical cylindrical mounting portions 25d as lightning protection element accommodating portions are formed integrally with the cap portion 25a at equal intervals and through the cap portion 25a in parallel with the pin fitting 28. There is.
Zinc oxide (ZnO) is provided in the through hole of each mounting head 25d.
A plurality of (two) current limiting elements 29 having a non-linear voltage-current characteristic, which is a main material of which is excellent in follow-current blocking characteristics, are housed, and caps are provided at both upper and lower ends of the mounting head 25d. The upper electrode 30 and the lower electrode 31 are fitted to each other, and the upper electrode 3
0 is connected to the cap fitting 27 via a lead wire 32, and the lower electrode 31 is connected to a pin fitting 28 by a lead wire 33.
It is connected to the. An arc guide 34 is supported on the cap fitting 27 in correspondence with the upper electrode 30.

When a lightning surge current flows in the power transmission line L, the current at this time flows through the hanging metal fitting 24 to the pin metal fitting 28 of the lightning protection insulator 23 on the lowermost side, and the lead wire 33 → lower electrode 31 → Current limiting element 29 → upper electrode 30 → lead wire 32 →
Flows to the cap fitting 27, and then the cap fitting 27
Flows to the pin metal fitting 28 of the lightning protection insulator 23 directly above. Similarly, a plurality of lightning protection insulators 23 connected in series are transmitted, and from the cap fitting 27 of the uppermost lightning protection insulator 23 to the hanging fitting 22.
And, it is discharged to the ground through the support arm 21.

At this time, the current limiting element 29 built in the insulator main body 25 quickly reduces its resistance value due to its characteristics to discharge a large current due to a lightning surge. Further, since the current reducing element 29 immediately restores the resistance value and restores the insulation with respect to the follow current continuing to the lightning surge, the follow current is suppressed and cut off and the electric line is normally restored.

[0005]

However, in the above-mentioned lightning arrester device, when the current limiting element 29 becomes conductive due to the following current, the current limiting element 29 is deteriorated, for example. The arc due to the follow current is transferred to the outer side of the lightning protection insulator series by the arc guide 34. At this time, the grounding side hanging metal fitting 22 and the voltage application side hanging metal fitting 24 are connected.
Arc horns 35, 36 provided on the
4 is set so large that the arc does not easily move between the two arc horns. Therefore, a follow-up arc runs along the surface of the lightning arrestor insulator, causing the lightning insulator insulator to burn and There is a risk that the lightning protection insulator series, which also has a function of mechanically supporting the electric wire L, may be disconnected.

An object of the present invention is to quickly apply a follow-current current following a lightning surge current when the current limiting element of the suspension type lightning arrestor is deteriorated or the conduction is broken by an unexpected lightning surge current. And moved to the grounding side arc horn,
It is an object of the present invention to provide a suspension type lightning arrester device capable of preventing a surface flashover of a series of lightning arrestor insulators.

[0007]

In order to achieve the above-mentioned object, the present invention connects a plurality of suspension type lightning arrestors having a plurality of lightning arrester housings in series to a support arm of a steel tower through a grounding side connecting metal fitting. At the same time, the power transmission line is supported at the end on the power-supply side of this suspension lightning-insulator ream via the power-supply-side connecting metal fittings.
In the suspension type lightning arrester device, each of which is attached with an arc horn for preventing a creeping flashover of a suspension insulator series with respect to the grounding side and the charging side connecting fittings, the arc horn,
The Configure ground side and the proximal portion which is cantilever supported lifting the connecting fitting of the voltage application side, and an intermediate bent portion continuous to the base end portion, by a distal end portion continuous to the bent portion between intermediate, the intermediate the bent portion, disposed close to the element receiving part takes the means of directing the tip portion of the arcing horn to the outer side towards.

[0008]

According to the present invention, the arc horn is connected to the ground side.
And a base end portion that is cantilevered by the connecting metal fitting on the power-supply side, an intermediate bent portion that connects to the base end portion, and a tip portion that connects to the intermediate bent portion. Since the current limiting element is placed in a conductive state due to the follow current that follows the lightning surge current, the follow arc is generated between the arc horns on the voltage application side and the ground side, because the current limiting element is placed in proximity to the element housing part. Immediately shifts, flashover occurs between the arc horn on the charging side and the grounding side,
Burnout of lightning protection insulators is prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIG.
And it demonstrates based on FIG. As shown in FIG. 1, a suspension metal fitting 2 is fixed to a support arm 1 of a steel tower, and a grounding side connection yoke 5 is horizontally supported on the suspension metal fitting 2 via a connection link 3 and a parallel clevis link 4. There is. At the left end of the connecting yoke 5, a suspension insulator string 6 constituted by connecting a plurality of normal suspension insulators in series is suspended, and at the right end thereof, a suspension type lightning insulator series in which a plurality of suspension type lightning protection insulators 23 are connected in series. The upper ends of 7 are connected. Further, a charging side connecting yoke 8 is connected between the lower ends of the two insulator chains 6, 7.
In addition, a connecting link 9 is provided at the center of the charging side connecting yoke 8.
The transmission line L is supported via the electric wire clamp 10.

Corresponding to the suspension insulator series 6, arc horns 11 and 12 for preventing creeping flashing of the suspension insulator series 6 are supported by the connecting yokes 5 and 8 on the grounding side and the charging side. . Further, in order to correspond to the suspension type lightning protection insulator series 7, arc horns 13 and 14 for preventing creeping flash of the lightning protection insulator series 7 are respectively supported at two locations on both connecting yokes 5 and 8. . A bracket 15 is connected to the base end portions 13a and 14a of both arc horns 13 and 14, and is fixed to each connecting yoke 5 and 8 by a bolt 16. Then, both arc horns 13 and 13 on the ground side
Of songs folded intermediate portion Gaité bent portion 13b, 13b, 14b,
14b is formed, and the bent portions 13b, 13b are arranged close to the arc guides 34, 34 of the lightning protection insulator 23 located at the uppermost end . In addition, both arc horns 1 on the voltage side
The intermediate bent portions 14b, 14b of 4, 14 are arranged close to the lower electrode 31 of the lightning protection insulator 23 located at the lowermost end. Furthermore, the tip portions 13 of both arc horns 13 and 14 are
As shown in FIG. 1, c and 14c are supported rightward, that is, in a state of projecting in a direction parallel to the line direction.

It should be noted that the balance weight 1 is attached to each of the cap fittings of the suspension insulators constituting the suspension insulator series 6.
7 are fitted to each other, and the suspension type lightning arrester series 7 and the suspension series insulator 6 are connected.
It is designed to balance the weight of. Now, in the present invention, the intermediate bent portions 13 b , 13 b , 14 b , and 14 b of both arc horns 13 and 14 are located above and below the accommodation portion (mounting cylinder portion 5 d) of the current limiting element 29. Since they are arranged close to each other, when a lightning surge current flows in a state where the current limiting element 29 is deteriorated and the current limiting element 29 becomes conductive, an arc due to the follow current is generated in the arc horn. The arc horns 13, 1 are immediately captured by the bent portions 13 b , 13 b , 14 b , 14 b of the arc horns 13, 1.
4 and move to the outer side, and both arc horns 13 and 14
A flashover occurs between the tips of the. Therefore, the flashover of the suspension type lightning arrester insulator 7 is prevented.

Next, an embodiment in which the present invention is embodied in a tension resistant lightning insulator device will be described with reference to FIGS. 3 and 4. In this embodiment, the suspension insulator string 6 and the suspension type lightning arrester string 7 are supported horizontally in a tension tower, and the arc horns 13, 1 are attached to the upper surfaces of the connecting yokes 5, 8.
4 is arranged so as to be close to the accommodating portion of the current limiting element 29. The base ends of the arc horns 13 and 14 are connected by a bracket 15a, and the brackets are attached to the connecting yokes 5 and 8 by bolts 16.

Also in this embodiment, when the current limiting element becomes conductive due to the lightning surge current, the continuous arc is rapidly transferred between the tip portions of both arc horns 13 and 14 and suspended as in the above-mentioned embodiment. The surface flashover of the type lightning arrester insulator 7 is prevented.

[0014]

As described in detail above, according to the present invention, when the current limiting element of the suspension type lightning arrester series is brought into conduction by the lightning surge current, the arc caused by the follow current is promptly generated. It can be cut off by moving it between parts, and it also prevents creeping flashovers of the suspension type lightning arrestor series.
This has the effect of eliminating the disconnection of insulators.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a suspended lightning arrester device embodying the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a front view showing another embodiment of the present invention.

FIG. 4 is a side view of FIG.

FIG. 5 is a front view showing a conventional suspension type lightning arrester device.

FIG. 6 is a semi-longitudinal sectional view showing a lightning protection insulator.

[Explanation of symbols]

1 Support Arm, 5 Grounding Side Connection Yoke, 6 Suspension Insulator Stations, 7 Suspension Type Lightning Insulator Stations, 8 Power Supply Side Connection Yoke, 1
3 ground side arc horn, 14 charging side arc horn,
13a, 14a Intermediate bent portion.

Claims (1)

[Claims] 1. A plurality of suspension type lightning arresters having a plurality of lightning protection element accommodating portions are connected in series to a support arm of a steel tower through a grounding side connecting metal fitting, and an end of a suspension type lightning protection insulator series on the side of charging. Suspension type lightning protection in which an electric power line is supported by a connecting section on the power-supply side and arc horns are attached to the connecting section on the ground side and the connecting section on the power-supply side to prevent creeping flashover of the suspension insulator series. In an insulator device, the arc horn
And constitutes a proximal end portion which is cantilever supported lifting the connecting fitting of the ground side and the voltage application side, and an intermediate bent portion continuous to the base end portion, by a distal end portion continuous to the bent portion between the intermediate, the intermediate the bent portion, disposed close to the element receiving part, pendent arrester insulator apparatus being characterized in that directed the tip of the arcing horn to the outer side towards.