JPH01246725A - Lightening insulator device - Google Patents

Abstract

PURPOSE:To make it unnecessary to furnish a strong holding function and to realize a small size and a light weight by linking a lightening insulator parallel to a holding insulator through fixing adaptors to both ends of the holding insulator, and furnishing a rotation allowable device to each adaptor. CONSTITUTION:Between a pair of fixing adaptors 14, a holding insulator 13 and a lightening insulator 15 are held in parallel to form a composition, and two sets of such compositions are linked in the longitudinal direction. As a result, the hanging load in the longitudinal direction of the device itself, and the bending load in the lateral direction by a wind pressure and the like are received by the holding insulator 13. And each fixing adaptor 14 is divided into two parts 14a and 14b, and the both parts 14a and 14b are linked with a pin joint 21 or a flexible joint 22. Consequently, the bending force acting to the holding insulator 13 is never delivered to the lightening insulator 15 side, and a small size and light weight composition furnishing mainly the lightening function can be used as the lightening insulator 15.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention, when an abnormally large current flows through a power transmission line due to a lightning strike, quickly discharges it to the ground using a lightning protection function, and suppresses and interrupts follow-on current. This invention relates to a lightning arrester device that can prevent permanent ground faults.

(Prior Art) Conventionally, as this type of lightning arrester device, a plurality of lightning arresters each including a current limiting element housed in a voltage-resistant insulating cylinder are connected in the vertical direction to form a lightning arrester group, and the lightning arrester The group is suspended and fixed from a support arm of a steel tower via a mounting adapter, etc., and an arc horn on the grounding side is installed at the lower end of the lightning arrester group, and an arc horn on the charging side is installed on the power transmission line side, for example, on a wire hanging metal fitting. It is known that a horn is provided and a predetermined air discharge gap is formed between both arc horns.

(Problem to be Solved by the Invention) However, in this conventional lightning arrester device, a group of lightning arresters formed by connecting and fixing a plurality of lightning arresters in the vertical direction is supported in a suspended state by a support arm of a steel tower, etc. Therefore, a large vertical suspension load and horizontal bending Mffi due to wind pressure etc. act on each lightning arrester. For this reason, each lightning arrester must have a strong support function, such as increasing the diameter and wall thickness of the voltage-resistant insulating tube, so that it can withstand these loads. There was a problem with that.

This invention consists of 1. This lightning arrester device was developed by focusing on the problems existing in the conventional technology, and is capable of reducing the size and weight of the lightning arrester without requiring the lightning arrester to have a strong support function. The purpose is to provide

(Means for Solving the Problems) In order to achieve the above object, the lightning arrester device of the present invention includes a support insulator that can withstand mechanical bending loads, and a mounting adapter that is connected to both ends of the support insulator. The lightning arrester is connected in parallel with the supporting insulator, and the mounting adapter is provided with rotation permitting means so as to follow the bending of the supporting insulator.

(Function) When a plurality of lightning arrester devices configured as described above are connected vertically and suspended from a support arm of a steel tower, for example, the suspension load in the vertical direction and the horizontal direction due to wind pressure, etc. The bending load is reliably supported by the support insulator and hardly acts on the lightning arrester.

For this reason, lightning arrester insulators only need to be strong enough to withstand almost their own weight, so they are made smaller and lighter.
Manufacture can be easily performed. Furthermore, since structural design means suitable for each function can be applied, a more rational design is possible, and the size and weight can be significantly reduced.

(Example) Hereinafter, a practical example of the present invention will be explained in detail based on FIGS. 1 to 3.

As shown in FIG. 1, a suspension insulator chain 2 formed by connecting a plurality of suspension insulators 1 in series is attached to a support arm 3 of a steel tower via a mounting bracket 4, etc., and a power transmission line 5 is attached to the lower end of the suspension insulator chain 2. It is supported via mounting fittings 6 and the like. A pair of arcing horns 7.8 are provided protruding from the sides of both claw fittings 4, 6, and damage to the suspended insulator chain 2 due to creeping flash is reduced by these arcing horns 7.8.

Avoid? If the insulator device 9 includes a support fitting 10 on the support arm 3,
The arc horn 11 on the grounding side is attached to the lower end of the arc horn 11 . Arc horn 12 on the charging side
is protruded from the lower mounting bracket 6 of the suspended insulator chain 2, and a predetermined air discharge gap G is formed between the arc horn 12 on the power supply side and the arc horn 11 on the ground side.

As shown in FIGS. 1 and 2, the lightning arrester device 9 includes a support insulator 13, mounting adapters 14 attached to both upper and lower lower ends of the support insulator 13, and mounting adapters 14 attached to both the support insulator 13 and the mounting adapters 14 so as to be parallel to the support insulator 13. It consists of an assembly including a lightning arrester 15 supported between adapters 14, and in this embodiment, two sets of the assembly are connected vertically. The supporting insulator 13 is made of a core material made of a tensile material such as FRP, and rubber molded around the outer periphery thereof, and has properties that sufficiently withstand mechanical hanging loads in the vertical direction and bending loads in the lateral direction. There is.

The lightning arrester 15 includes a voltage-resistant insulating cylinder (not shown) formed in a cylindrical shape from a tensile material such as FRP, and a voltage-resistant insulating cylinder (not shown) whose main material is zinc oxide (ZnO) housed in series therein. - Current-limiting cables (not shown) with non-linear current characteristics and electrode fittings 1, 6.1 fixed to both ends of the voltage-resistant insulating cylinder
7 and a rubber mold 18 provided on the outer periphery of the voltage-resistant insulating tube. Furthermore, this lightning insulator 15
Because almost no mechanical bending load or the like acts on the insulating tube, a small-diameter, thin-walled insulating tube is used as the pressure-resistant insulating tube.

Further, arcing rings 19 are provided at both upper and lower ends of each M'FM insulator 15 to reduce damage caused by creeping flash of the rubber mold 18, and a shield ring 20 is provided at the lower end of the lower support insulator 13. There is.

On the other hand, as shown in FIGS. 3 and 4, each mounting adapter 14 in the lightning arrester device 9 is divided into a portion 14a corresponding to the support insulator 13 and a portion 14b corresponding to the lightning arrester 15. The portions 14a and 14b are rotatably connected via a bin joint 21 or a flexible joint 22 as a rotation permitting means. Therefore, even if a bending force acts on the support insulator 13, it will not be transmitted to the lightning arrester 15.

Now, in the lightning arrester device 9 of this embodiment, as described above, two sets of assemblies in which the support insulator 13 and the lightning arrester 15 are supported in parallel between the pair of adapters 14 are connected in the vertical direction. Because of this structure, the support insulator 13 prevents the suspension load of the device itself in the vertical direction and the bending load in the lateral direction due to wind pressure or the like. Also, each mounting adapter 1
4 is divided into two parts 14a and 14b, and the image part 14
a.

14b are connected by the bin joint 21 or the flexible joint 22, the bending force acting on the support insulator 13 is not transmitted to the lightning arrester 15 side, and the lightning arrester 15 has a small and lightweight structure mainly having a lightning protection function. can be used.

Note that when a large current is applied to the power transmission line 5 due to a lightning strike, the current flows from the mounting bracket 6 and the arc horn 12 on the charging side to the arc horn 11 on the grounding side via the air discharge gap G.
The current limiting element and support fitting 1 of each lightning arrester 15
0 to the support arm 3 of the tower and is discharged to the ground. Then, the subsequent flow is caused by the lightning arrester 15.
It is suppressed and cut off by the current limiting element.

(Another Embodiment) Next, another embodiment of the present invention will be described based on FIG. 5 and FIG.
4 is formed into an L-shape in cross section, and two device assemblies including a support insulator 13, a lightning arrester 15, etc. are supported with respect to the support arm 3, etc. so that the side surface shape is an inverted letter. There is. Therefore, in this embodiment as well, mechanical bending loads and the like are stopped by the support insulator 13 and hardly act on the lightning arrester 15.

Note that the support insulator 13 has a circular cross section;
It may be constructed by covering a circular, square, or cross-shaped tension-resistant insulating rod with an insulating rubber mold. In the case of an annular rod, it is desirable to fill the inside with closed foam rubber.

(Effect of the invention) Since this invention is configured as explained above,
It is not necessary to provide the lightning arrester with a strong support function to withstand large vertical hanging loads and lateral bending loads due to wind pressure, etc. It has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a front view showing how a lightning arrester device embodying the present invention is used, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a view of the rotation permitting means on the mounting adapter. FIG. 4 is a partial side view showing an enlarged configuration of the configuration, FIG. 4 is a partial side view showing another configuration of the rotation permitting means, FIG. 5 is a front view showing another embodiment of the lightning arrester device, and FIG. is its plan view. 9... Lightning arrester device, 13... Support insulator, 14...
- Mounting adapter, 15--Lightning arrester, 21--Pin joint as a means for allowing rotation, 22--Flexible joint as means for allowing rotation. Patent applicant: Nippon Insulator Co., Ltd. Agent
Patent Attorney On 1) Hironobu Figure 3 Figure 4

Claims (1)

[Claims] 1. A support insulator that can withstand mechanical bending loads, and a lightning arrester insulator connected in parallel to the support insulator via mounting adapters to both ends of the support insulator, and a lightning arrester insulator connected to both ends of the support insulator in parallel with the support insulator so as to follow the bending of the support insulator. A lightning arrester device characterized in that a mounting adapter is provided with a rotation permitting means.