JPH01298609A - Lightning protection insulator device for overhead power transmission line - Google Patents

Abstract

PURPOSE:To prevent a discharge electrode and arcing horn on a charge side of a device from oscillating alternately in the vertical direction when a power transmission wire is oscillated by wind pressure and the like and to control the fluctuation in aerial discharge intervals so as to improve the reliability of a lightning protection insulator device by balancing the weight of discharge electrode and the weights of the arcing horn. CONSTITUTION:A support insulator 5 is suspended through upper horn setting fittings 4 with respect to a support arm 1 of an insulator device, while at the lower end part of an insulator 5, a power transmission wire 10 is layed through lower horn setting fittings 7 and a wire clamp 9. On the arm 1 side is fitted a lightning prevention insulator 15 in which a current limiting element having nonlinear voltage-wire property is built, and a discharge electrode 11 on a discharge side set at fittings 7 and a discharge electrode 19 on a grounding side set at the insulator 15 is arranged in opposition to each other with a specified aerial discharge gap G1. Further, to upper and lower part mounting fittings 4, 7, arcing horns 12, 13 on the grounding and charge sides for preventing generation of creeping flash path in the insulator 5 are set and the dia. of the arcing horn 13 is made larger, thereby the weights of arcing horn and electrode 11 is balanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a lightning arrester device for overhead power transmission lines.

[Prior art] A conventional lightning arrester device for overhead power transmission lines is disclosed in Japanese Patent Application Laid-open No. 62-9.
What is shown in Publication No. 0815 has been proposed. This device suspends a suspension insulator chain consisting of a large number of suspension insulators connected in series from the support arm of a steel tower via an upper hanging bracket, and a lower hanging bracket and an electric wire clamp are attached to the lower end of the suspension insulator chain. It supports power transmission lines through. Further, a mounting adapter is supported on the upper hanging metal fitting, and at the end of the adapter, a lightning protection glass containing a current limiting element mainly made of zinc oxide, which has non-linear voltage-current characteristics, is installed. A grounding side discharge electrode which is fixedly suspended and provided at the lower end of this lightning arrester and a energized side discharge Th electrode which is cantilevered on the lower hanging metal fitting are opposed to each other with a predetermined air discharge gap. .

On the other hand, arc horns on the ground side and on the energized side for preventing creeping flash of the suspended insulator chain are arranged opposite to each other with a predetermined air discharge gap on the upper hanging metal fitting and the lower hanging metal fitting. .

[Problems to be Solved by the Invention] However, in the conventional lightning arrester device, the length of the arc horn on the energized side is shorter than the length of the discharge electrode on the energized side, and as a result, the weights of the two become unbalanced. In the case of a power transmission line where the dead weight of the power transmission line is light and the vertical load is relatively small, the discharge electrode and the arcing horn on the energized side tend to swing vertically alternately, and the discharge gap between the discharge electrodes and the arcing horn are There was a problem in that the discharge gap became unstable and the reliability as a lightning arrester device was lacking.

An object of the present invention is to provide a lightning arrester for power transmission lines that can stably support the discharge electrode and the arc horn on the power supply side and improve reliability by solving the problems that exist in the conventional lightning arrester device described above. The goal is to provide equipment.

[Means for Solving the Problems] In order to achieve the above object, the present invention suspends a support insulator from a support arm via an upper horn mounting bracket, and a lower horn mounting bracket and a lower horn mounting bracket are attached to the lower end of the support insulator. A power transmission line is installed via a wire clamp, a lightning arrester with a built-in current limiting element with non-linear voltage-wire characteristics is installed on the support arm side, and a lightning arrester with a built-in current limiting element with non-linear voltage-wire characteristics is installed on the power supply side provided on the lower horn mounting bracket. The discharge electrode and the ground side discharge electrode provided on the lightning arrester are opposed to each other with a predetermined air discharge gap, and the upper and lower horn mounting brackets are provided with a ground side and a ground side disposed on the support insulator to prevent creeping flash. In a lightning arrester device to which an energizing side arc horn is attached, the arc horn on the energizing side is made to have a large diameter so that its weight is balanced with the discharge electrode on the energizing side.

[Function] In the lightning arrester device of the present invention, the weight of the discharge electrode on the power supply side and the weight of the arc horn on the power supply side are balanced, so even if the power transmission line swings due to wind pressure, etc., the lightning arrester device will not be charged. The discharge electrode and arc horn on the power side do not swing vertically alternately,
Therefore, the air discharge gap between the discharge electrode on the side of the section and the discharge electrode on the ground side and the air discharge gap of the arc horn between the energized side and the ground side to prevent creeping flash of the supporting insulator are almost constant. This improves electrical reliability.

[Example] Hereinafter, an example embodying the present invention will be described based on FIGS. 1 to 3.

A hanging fitting 2 is fixed to the support arm 1 of the steel tower with bolts, a U clevis 3 is locked to the hanging fitting 2, an upper horn mounting fitting 4 is connected to the U clevis 3, and the horn The upper end portion of a suspension insulator chain 5, which serves as a support insulator and is formed by connecting a large number of suspension insulators in series, is connected to the mounting bracket 4.

A lower horn mounting bracket 7 is connected to the lower end of the suspension insulator chain 5 through parallel clevises 6, a connecting link 8 is connected to this horn mounting bracket 7, and an electric wire is connected to the connecting link 8. A power transmission line 10 is installed via a clamp 9.

The right arm portion 7a of the lower horn mounting bracket 7 is provided with a ground side discharge St pole 19 and a predetermined air discharge gap G1, which will be described later.
The discharge electrodes 11 on the charging side facing each other are supported in a cantilever manner. Also, the upper and lower horn mounting brackets 4.
7 arm portion 4a.

4b and 7b, arc horns 12.13 on the grounding side and on the energizing side for preventing creeping flash of the suspension insulator chain 5 are cantilevered so as to face each other with a predetermined air discharge gap G2. . The arc horn 13 on the power supply side is formed to have a large diameter so as to balance the discharge on the power supply side with the weight of the electrode 11, and when the power transmission line 10 swings due to wind pressure or the like, the discharge electrode 11 and the arc horn 13 is prevented from swinging alternately in the vertical direction.

A mounting adapter 14 is supported on the support arm 1 as shown in the plane of FIG.
The ground side electrode fitting 16 of No. 5 is fixed with a bolt. This lightning arrester 15 has a built-in current-limiting element (path shown) whose main material is zinc oxide with non-linear voltage-current characteristics inside a voltage-resistant insulating cylinder (path shown) such as FRP, and The electrode fittings 16 on the grounding side and the electrode fittings 17 on the charging side are fitted and fixed to both ends of the tube, and an insulating jacket is rubber-molded on the outer surface of the voltage-resistant insulating tube. The electrode fitting 17 on the energizing side supports a grounding side discharge electrode 19 that faces the energizing side discharge t'lli 11 with a predetermined aerial discharge gap G1.

Next, the operation of the lightning arrester device for overhead power transmission lines constructed as described above will be explained.

Now, when a surge current occurs due to a lightning strike in the power transmission i & 110, this surge current passes through the connection link 8 and the lower horn mounting bracket 7, and is flooded over from the discharge electrode 11 on the power supply side to the discharge amount electrode 19 on the grounding side. Insulator’s! 4′!
fl metal fitting 17, current-limiting element (as shown) ground side electrode metal fitting 1
6, is discharged to the steel tower via the mounting adapter 14 and the support arm 1. Further, the subsequent current generated thereafter is suppressed and interrupted by the current limiting element and the air discharge gap G1.

Now, in the embodiment of the present invention, the diameter of the arc horn 13 is increased so that the discharge on the energizing side of the lower horn mounting bracket 7 is balanced between the pole 11 and the arc horn 13 of the charge trfjA in terms of weight. Even if the electric wire 10 swings due to wind pressure or the like, the discharge electrode 11 and the arc horn 13 will not swing alternately in the vertical direction. Therefore, the above-mentioned aerial discharge gaps Gl and G2 are maintained almost constant, and the electrical reliability of the lightning arrester device is improved. Therefore, the progress of wear and tear can be reduced, and fluctuations in the air discharge gap G2 can be suppressed.

Note that the present invention is not limited to the above embodiments,
It can also be specified as follows.

(1) In the embodiment described above, the arc horn 13 on the energizing side was integrally formed of the same material, but as shown in FIG. Filling the pipe with another material, and fitting and fixing the solid discharge part 25 to the tip of the pipe 23.

(2) As shown in FIG. 5, in order to adjust the vertical inclination angle with respect to the base end of the discharge electrode 11 and the arc horn 13 on the energizing side, the arm portion 7a1 of the lower horn mounting bracket 7 is
, 7b is formed with a long hole 7c in an arc shape, and the bolt 26.
Tighten and fix using 27.

(3) To reduce the amount of snow accumulated on the arc horn 13,
The diameter of the horn in the vertical direction is made larger than the diameter in the horizontal direction.

(4) Attach the lightning arrester 15 to the arm portion 4a of the horn mounting bracket 4.
The lightning arrester 1 is installed by increasing the diameter of the arc horn 12.
To balance with 5.

[Effects of the Invention] As described in detail above, the present invention stabilizes the attachment state of the discharge electrode on the power supply side and the arc horn on the division side even if the power transmission line oscillates due to wind pressure, etc., and prevents arc discharge. By reducing the progress of melting loss caused by this, it is possible to suppress fluctuations in the air discharge gap and improve electrical reliability.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the lightning arrester device for overhead power transmission lines according to the present invention, in which FIG. 1 is a front view of the entire device, FIG. 2 is a plan view, and FIG. Similarly, FIG. 4 is a right side view, FIG. 4 is a sectional view of the main part showing another example of the present invention, and FIG. 5 is a front view of the main part showing another example of the invention. 1...Support arm, 4...Upper horn mounting bracket, 5
... Suspended insulator chain as a support insulator, 7. Lower horn mounting bracket, 9. Wire clamp, 10. Power transmission line, 11. Arc horn as a discharge Th electrode on the charging side. 12 (13)... Earthing (arc horn of electrified HpJ, 14... Mounting adapter, 15... Lightning arrester, 19
... Arc horn as a discharge electrode on the ground side. Patent applicant Nippon Insulators Asahi Malleable Iron Co., Ltd. Agent Patent attorney On1) Hironobu

Claims (1)

[Claims] 1. Upper horn mounting bracket (4) for support arm (1)
A support insulator (5) is suspended through the support insulator (5), and a power transmission line (10) is installed at the lower end of the support insulator (5) via a lower horn mounting bracket (7) and a wire clamp (9). A lightning arrester (15) containing a current limiting element with non-linear voltage-wire characteristics is installed on the support arm (1) side, and a discharge electrode (15) on the energized side provided on the lower horn mounting bracket (7) is installed on the support arm (1) side. 11) and the ground side discharge electrode (19) provided on the lightning arrester (15), facing each other with a predetermined aerial discharge gap (G1), and further attaching the upper and lower horn mounting brackets (4, 7) to each other. is a lightning arrester device in which arc horns (12, 13) on the grounding side and the charging side for preventing creeping flash of the support insulator (5) are attached, and the weight is balanced with the discharge electrode (11) on the charging side. A lightning arrester device for an overhead power transmission line, characterized in that the arc horn (13) on the power supply side has a large diameter so that the power supply side arc horn (13) has a large diameter.