JPH01260718A - Horn-type lightning insulator device - Google Patents

Abstract

PURPOSE:To facilitate the mounting and simplify the application to the device already provided, even when the horizontal lead-in angle of a tension-resisting insulator makes an inclined angle, by electrically connecting a discharging electrode and a jumper wire via a spanned flexible lead wire. CONSTITUTION:A discharging electrode 39 in the voltage applied side on the lower end of a supporting insulator 22 and a jumper wire 20 is electrically connected by a flexible lead wire 26 with allowance. Thus the lead wire 26 can be connected between the discharging electrode 39 in the voltage applied side and the jumper wire 20 in accordance with the spacing therebetween, even when the horizontal lead-in angle of a tension-resisting insulator 12 makes an inclined angle and the jumper wire 20 is spaced away from the supporting insulator 22 inwardly or outwardly. As a consequence, application to an already provided tension-resisting insulator is facilitated.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention quickly discharges abnormally high voltage caused by lightning when it is applied to a power transmission line, and the subsequent This invention relates to a lightning horn insulator device for overhead power transmission lines, particularly for tension towers, to prevent ground faults.

(Prior Art) Generally, in a tension insulator device for power transmission lines, a jumper wire is connected between the ends of a pair of tension insulators to maintain aerial insulation between the power transmission line and the tower support arm. I have to. This jumper wire is prone to sway due to the wind, for example 4 Q
The deflection angle is approximately 60 degrees at a wind speed of 36 m/36 m, and the design is such that even in this state, sufficient air insulation clearance between the jumper wire and the steel tower can be secured.

However, in recent years, a lightning horn insulator device in which a lightning arrester is incorporated into the tension insulator device has come into use, and as this insulator device, the one shown in FIG. 6 has been proposed. In this device, a support insulator 22 is suspended and fixed to a support arm 1 of a steel tower, a lower metal fitting 24 provided at the lower end of the insulator 22 holds a jumper wire 20 with a wire gripping metal fitting 25, and a jumper wire 20 is held by a wire gripping metal fitting 25, and a jumper wire 20 is held by a wire gripping metal fitting 25. The arc horn 39 on the power supply side was supported. On the other hand, a lightning arrester 35 containing a non-linear resistance element such as zinc oxide is suspended and fixed to the support arm 1 via a mounting adapter 21.
A ground side arc horn 38 facing the arc horn 39 with a predetermined air discharge gap G was attached to the lower end of the arc horn 5.

(Problems to be Solved by the Invention) The conventional device has no problem as long as the jumper wire 20 is located at the position of the wire gripping fitting 25 provided at the lower end of the support insulator 22. However, due to the location conditions of the steel tower or the installation conditions of the power transmission line, the horizontal drawing angle of the power transmission line, that is, the tension insulator (shown in the diagram) with respect to the support arm 1 when viewed from the plane (
When the inclination angle (hereinafter referred to as the horizontal retraction angle of the tension insulator) is other than a right angle, the jumper wire 20 will move from the tip of the support arm 1 either outward (to the right in FIG. 6) or inward (to the right in FIG. As a result, the jumper wire 2
0 to the wire grip fitting 25 at the bottom of the support insulator 22, or it is necessary to remove one end of the jumper wire 20 and connect a separately prepared auxiliary jumper wire, which makes the pole mounting work extremely troublesome. However, it was difficult to apply it to existing tension insulator equipment.

Note that the current-carrying cross section of the jumper wire 20 is, for example, 51Qmr.
r? , 1160mn? In the case of a large diameter jumper wire, the bending rigidity of the jumper wire itself is high, making the above-mentioned pulling operation extremely difficult.

In view of the above-mentioned circumstances, the first object of the present invention is to make it possible to easily install the jumper wire without displacing or lengthening the jumper wire even when the horizontal retraction angle of the tension insulator is an inclined angle. An object of the present invention is to provide a lightning-resistant horn insulator device that can be extremely easily applied to an existing tension-resistant insulator device.

In addition to the first object, the second object of the present invention is to minimize the distance between the lightning arrester and the tension insulator to shorten the surge propagation time, so that the lightning surge current can be transferred to the jumper wire. To provide a lightning protection horn insulator device capable of improving the operational reliability of the lightning protection insulator even when the lightning protection insulator is invaded from either the left or right side.

(Means for Solving the Problem) In order to achieve the first object, the lightning horn insulator device according to claim 1 connects the tension insulator to the support arm of the steel tower via a pair of left and right tower side connecting fittings. At the same time, a power transmission line is installed on the tension insulator via a wire side connecting fitting,
A jumper wire is installed and connected between the two electric wire side connecting fittings, while a support insulator is suspended and fixed to the support arm by a mounting adapter, and a discharge electrode on the energizing side is provided at the lower end of the support insulator. , the discharge electrode and the jumper wire are electrically connected by a flexible lead wire, and a lightning arrester is suspended and fixed to the support arm or the mounting adapter, and a lower end of the lightning arrester is fixed to the support arm or the mounting adapter. A configuration is adopted in which the ground-side discharge electrode provided on the energized side and the energized-side discharge electrode face each other with a predetermined aerial discharge gap.

Further, in order to achieve the second object, in the lightning horn insulator device according to claim 2, in the lightning horn insulator device according to claim 1, the lightning horn insulator device is attached to the lower part of the support insulator, A configuration is adopted in which the book lead wires are installed so that they extend in opposite directions along the line direction of the jumper wires.

(Function) In the lightning horn insulator device according to claim 1, the discharge electrode on the energized side at the lower end of the support insulator and the jumper wire are electrically connected with a margin by the visible lead wire, so that the lightning resistance Even if the horizontal retraction angle of the insulator is an inclination angle and the jumper wire is separated from the supporting insulator inwardly or outwardly,
A lead wire can be connected between the discharge electrode on the energizing side and the jumper wire according to the distance between the two, and therefore it is easy to apply the present invention to an existing tension insulator device.

Furthermore, even if the jumper wire swings horizontally due to wind pressure, etc., the lead wire simply swings, and therefore the discharge electrode on the energized side and the discharge electrode on the ground side always maintain a constant air discharge. They face each other with a gap, and the discharge characteristics do not deteriorate.

Furthermore, in addition to the effects of the lightning horn insulator device according to claim 1, the lightning horn insulator device according to claim 2 provides a T-branch from the jumper wire even if a lightning surge current enters from either the left or right direction of the jumper wire. Unlike the case where the tension insulator and the lightning arrester are connected electrically at the shortest distance, the voltage quickly flows from the lead wire through the discharge electrodes on the energized side and the grounding side to the lightning arrester side. The operational reliability of the lightning arrester can be improved by suppressing the voltage increase in the tension insulator that supports the power transmission line.

(Example) Hereinafter, an example embodying the present invention will be described in detail based on FIGS. 1 to 5.

As shown in FIGS. 1 to 3, a mounting plate 2 is fixed to the support arm 1 of the steel tower with bolts 3, and the left and right ends of the mounting plate 2 are attached as shown in FIGS. 2 and 3. A tension-resistant insulator device 5 for supporting the power transmission line 4 is attached to each. A U clevis 6 is provided at the end of the mounting plate 2.
．． 7 are connected. A tower-side horn mounting fitting 9 equipped with an arc horn 8 is connected to the U clevis 7 by a shaft 10, and a tension insulator 12 is connected to one end of the fitting 9 by the shaft 10. In this embodiment, the above-mentioned U clevis 6.7 and the tower side string attachment fitting 9 constitute a tower side connecting fitting 11A.

A wire-side horn mounting bracket 1 is provided at the power-supplying end of the tension insulator 12 with an arc horn 14 via a connecting link 13.
5 are connected by a shaft 10.

A connecting link 17 is connected to the center of the horn mounting bracket 15 by a shaft 16, and a wire clamp 18 for clamping the power transmission line 4 is connected to the link 17 by the shaft 16. Further, a jumper wire 20 is installed in a substantially arc shape between the right and left wire clamps 18, 18 by a jumper wire clamp 19. In this embodiment, the electric wire side connecting fitting 1 is formed by the above-mentioned connecting link 13, electric wire side horn mounting fitting 15, connecting link 17, electric wire clamp 18, etc.
It constitutes 1B.

On the other hand, as shown in FIGS. 1 and 3, a mounting adapter 21 is cantilevered at the tip of the support arm 1 by the bolt 3 so as to be oriented horizontally and toward the front of the support arm 1. An upper metal fitting 23 of a support insulator 22 is fixed to the lower surface near the base end of the mounting adapter 21 with bolts 3, and a lower metal fitting 24 of the support insulator 22 also has the function of holding an arc horn 39 on the power supply side, which will be described later. Electric wire grip fitting 25
is attached. Between this electric wire gripping fitting 25 and the jumper wire 20, two flexible lead wires 26 are connected with a margin and extending in opposite directions from the electric wire gripping fitting 25 as shown in Fig. 2.3. They are constructed so that they are separated from each other.

As shown in FIGS. 4 and 5, both lead wires 26 are connected to jumper wires 20 by wire gripping units 27.
It is connected to the. This electric wire gripping unit 27 is composed of upper and lower clamp fittings 29 and 30 which are connected to each other in an openable and closable manner by a connecting pin 28 at one end, and a bolt 31 that tightens both clamp fittings 29 and 30. A caulking hole 29a provided in the part,
It is fixed to one end of the lead wire 26 by caulking or the like.
A bolt or a caulking pin is inserted into the caulking hole 32a of the terminal fitting 32 and is tightened and fixed. Note that a cap fitting 33 for preventing corona is fitted to the other end of the lead wire 26.

By extending the two lead wires 26 from the support insulator 22 in opposite directions along the line direction of the jumper wire 20,
Even if a lightning surge enters from either the left or right direction of the line, creepage internal shorting of the tension insulator device 5 is prevented. The two lead wires 26 may be one continuous wire, and the wire gripping units 27 may be provided at both ends thereof.

On the other hand, on the lower surface of the tip of the mounting adapter 21, there is provided a lightning arrester 3 which has a built-in resistance element 34 with non-linear voltage-current characteristics.
5 is suspended downwardly and fixed by a bolt with the electrode fitting 36 on the ground side. As shown in FIG. 1, an arc horn 38 serving as a discharge electrode on the ground side is attached to an electrode fitting 37 on the power supply side provided at the lower end of the lightning arrester 35. Then, the electric wire gripping fitting 2 of the support insulator 22
Arc horn 3 is attached to 5 and serves as a discharge electrode on the energized side.
9 and are arranged opposite to each other with a predetermined air discharge gap G therebetween.

The mounting adapter 2 and the electrode fitting 37 are provided with an arcing ring 40 for preventing creeping flash of the lightning arrester 35.
41 is attached.

In order to operate this device normally, the insulation strength of the lightning horn insulator device including the air discharge gap G is to withstand the operating voltage and the switching surge voltage, and the tension insulator device must be able to withstand the lightning surge voltage. The structure is such that a margin of more than a certain value is given to the insulation strength of No. 5.

Next, the operation of the lightning horn insulator device configured as described above will be explained.

Now, when an abnormally high voltage caused by a lightning strike is applied to the power transmission line 4, the current flows through the jumper vA20 and the lead wire 26 into the air that is properly maintained between the arc horn 39 and the arc horn 38. It is discharged in the discharge gap G and flows to the support arm 1 of the steel tower via the non-linear resistance element 34 built into the lightning arrester 35. Further, the subsequent arc generated thereafter is blocked by the above-mentioned aerial discharge gap G and the nonlinear resistance element 34.

In addition, even if the jumper wire 20 is swayed in the direction perpendicular to the track due to wind pressure or the like when it is mounted on a pole, the lead wire 26 is flexible, so the supporting insulator No mechanical load acts on 22, and
Since there is no influence on the discharge gap G between the arc horns 38 and 39, the electrical reliability of the device does not deteriorate.

In particular, this invention adopts a method in which the arc horn 39 of the energizing example attached to the support insulator 22 and the jumper 120 are electrically connected by the lead wire 26.
Even if the jumper wire 20 is separated from the support insulator 22 due to the horizontal retraction angle of the jumper wire 20 becoming an inclination angle, the jumper wire 20 and the arc horn 39 on the energizing side can be easily connected to each other without changing the position of the support insulator 22. Since it can be connected to existing steel towers, it is not necessary to apply a mechanical bending load to the support insulator 22 or change the length of the jumper wire 20, making it easy to apply to existing steel towers. be able to.

Moreover, this invention can also be implemented as follows.

(1) In the above embodiment, two lead wires 26 were used, but
Connect this to the left and right center portions of the jumper wire 20 in a T-shape.

(2) In the above embodiment, the jumper wire 20 is connected to the support arm 1.
Although the case where the structure is displaced inwardly has been described, it may be embodied in a tension-resistant insulator device that is displaced outwardly, or it may be embodied by making other arbitrary changes within the scope of the claims, although not shown.

(Effects of the Invention) As described in detail above, the lightning horn insulator device according to claim 1 has the ability to
In addition, it can be easily applied to existing tension insulator devices without changing the length of the jumper wire or pulling the jumper wire toward the support insulator, and the mechanical bending load on the support insulator is reduced. This has the excellent effect of stabilizing the device by eliminating any negative effects, and further stabilizing the discharge characteristics by always keeping the discharge gap between the two discharge electrodes constant.

Further, the lightning horn insulator device according to claim 2, in addition to the effects of the lightning horn insulator device according to claim 1, quickly guides lightning surge current to the lightning arrester side to ensure lightning protection characteristics,
This has the effect of preventing creeping flash in the tension insulator device and improving reliability.

[Brief explanation of the drawing]

1 to 5 show examples embodying the present invention; FIG. 1 is a cross-sectional view taken along line A-A in FIG. 2; FIG. 2 is a front view showing the entire lightning-protecting horn insulator device; 3 is a plan view showing the entire lightning-resistant horn insulator device, FIG. 4 is a partial sectional view showing the electrode holding unit, and FIG. 5 is the same (a plan view of the electrode holding unit, and FIG. 6 is a side view showing the conventional example). 1... Support arm, 4... Power transmission line, 5... Tension insulator device, 11A (11B)... Steel tower (wire) side connecting fitting, 12... Tension insulator, 15 ...Electric wire side horn mounting bracket, 20...Jumper wire, 21...Mounting adapter, 22...Support insulator, 24...Lower metal fitting, 25
...Wire gripping fitting, 26...Lead wire, 27...
Wire gripping unit, 28... Connection pin, 29.30.
... Clamp fitting, 31... Bolt, 32... Terminal fitting, 33... Camping fitting, 34... Resistance element,
35... Lightning arrester, 38... Arc horn as a discharge electrode on the ground side, 39... Arc horn as a discharge electrode on the energized side, G... Discharge gap.

Claims (1)

[Claims] 1. A tension insulator (12) is connected to the support arm (1) of the steel tower via a pair of left and right tower side connecting fittings (11A), and the tension insulator (12) is is the wire side connection fitting (
A power transmission line (4) is installed via the cable (11B), and a jumper cable (20) is installed and connected between the two electric wire side connecting fittings (11B), while a mounting adapter (20) is installed on the support arm (1).
21), the support insulator (22) is suspended and fixed, and a discharge electrode (39) on the energized side is provided at the lower end of the support insulator (22), and the discharge electrode (39) and the jumper wire (20) are connected to each other. are electrically connected by a flexible lead wire (26), and a lightning arrester (35) is suspended and fixed to the support arm (1) or the mounting adapter (21). a ground side discharge electrode (38) provided at the lower end of the insulator;
A lightning horn insulator device characterized in that the discharge electrode (39) on the energizing side faces the discharge electrode (39) with a predetermined aerial discharge gap (G). 2. In the lightning horn insulator device according to claim 1, a discharge electrode (3
Two lead wires (26) from jumper wire (20)
) lightning horn insulators installed so as to extend in opposite directions along the track direction.