JP2564332B2 - Lightning protection horn insulator device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention quickly grounds an abnormally high voltage caused by lightning when it is applied to a transmission line, and uses a follow-up arc generated thereafter. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning protection horn insulator device for an overhead power transmission line for preventing melting of the power transmission line, particularly for a tension tower.

(Prior Art) Generally, in a transmission line tension insulator device, a jumper wire is connected between the ends of a pair of tension insulators so as to maintain the air insulation between the transmission line and the tower support arm. I have to.
This jumper wire is easy to roll by wind, for example, 40m /
At a wind speed of sec, the deflection angle becomes about 60 degrees, and even in this state, it is designed to ensure a sufficient air insulation clearance between the jumper wire and the tower body.

In recent years, a lightning protection horn insulator device in which a lightning protection insulator is incorporated in this tension insulator device has been implemented, and as the insulator device, a current limiting element such as zinc oxide is attached to a support arm of a tower body via a mounting adapter. The lightning protection insulator enclosing the lightning protection is suspended and fixed so that the entire lightning protection insulator is located inside the jumper wire. The arc horns on the ground side facing each other were supported with a discharge gap.

(Problems to be solved by the invention) However, in the above-mentioned conventional device, one lightning arrester is vertically suspended so as to be located inside the jumper wire with respect to the tip of the support arm, and one voltage As the rank increases, the length of the lightning arrestor also increases, but the unit length is also limited by the manufacturing technology.Therefore, when the line voltage is 154KV, for example, two lightning insulators are connected in series, and at 275KV, three lightning insulators are connected. As the voltage class becomes higher, such as connecting the two in series, the long lightning arrestor will be used gradually, and as a result, if the insulation gap in the air is secured and sufficient insulation emphasis is attempted, the existing It was necessary to lower the jumper line downwards, which made it difficult to mount columns on the existing tower.

Further, in the case where the lightning insulator is long, a method in which the mounting adapter projects from the tip of the support arm to the outside in the direction orthogonal to the line and is vertically suspended and fixed to vertically displace both arc horns is also conceivable. However, there is a problem in that it is difficult to always keep the air discharge gap constant because of the nature of the jumper wire that is prone to roll.

In view of the above circumstances, the present invention can be applied to an existing tower body, and also provides a lightning protection horn insulator device that can always maintain the air discharge gap constant and stabilize the discharge characteristics. With the goal.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention connects a tension insulator to a support arm of a tower through a pair of left and right tower side connecting fittings, A transmission line is installed on the tension insulator via a wire-side connecting fitting, and a jumper wire is installed between the two wire-side connecting fittings, while a voltage-current is applied to the support arm via a mounting adapter. Supports a lightning arrester with a current limiting element whose main characteristic is non-linear zinc oxide, etc., and the arc horns on the voltage-imparting side and the grounding side of the jumper wire and lightning arrester have a predetermined air discharge gap. In the lightning protection horn insulator device mounted so as to face each other, the grounding side arc horn on the side of the lightning protection insulator is located on a perpendicular line passing through the arc horn on the side of charging, and the upper end or the middle portion of the lightning protection insulator is laterally directed. To be displaced Have adopted the growth.

(Operation) This invention operates as follows by adopting the above means.

Both the charging side and grounding side arc horns correspond to the top and bottom, so a simple structure in which an arcuate part similar to the swinging locus of the jumper wire is provided on the grounding side arc horn, so that the jumper can be adjusted by wind pressure. Even if the wire swings, the air insulation gap of both arc horns can be kept substantially constant.

In addition, since the middle part or the upper part of the lightning arrestor is installed so as to be displaced from the perpendicular line passing through the arc horn on the charging side, it is possible to apply a long lightning insulator to the existing tower, which is advantageous on the pole. is there.

(Embodiment) An embodiment embodying the present invention will be described in detail below with reference to FIGS. 1 and 2.

As shown in FIG. 2, a mounting plate 2 is fixed to the support arm 1 of the tower body with bolts 3.
At the left and right ends of each, tension-resistant insulators 5 made by connecting suspension insulators in series via tower-side connecting fittings 4 are mounted,
A power transmission line 7 is installed on each of the tension insulators 5 via a wire-side connecting metal fitting 6. In addition, reference numerals 8 and 9 are arc horns for preventing creeping flash on the creeping insulator 5 fixed to the connecting fittings 4 and 6.

Two jumper wires 10 are laid between the two wire-side connecting fittings 6, 6 in parallel with each other and in an arc shape when viewed from the direction perpendicular to the line. A mounting member 11 made of a conductive material is attached to the central portion of the jumper wire 10, and an arc horn 12 on the power charging side is erected on the upper surface of the mounting member 11.

On the other hand, as shown in FIG. 1, at the tip of the support arm 1, a mounting adapter 13 having a slanted portion 13a formed by bending the tip thereof is provided so as to be directed horizontally by the bolt 3 and in front of the support arm 1. Has been supported. The inclined portion
On the lower surface of 13a, a lightning arrester 15 having a current limiting element 14 mainly composed of zinc oxide whose voltage-current characteristic is non-linear is built-in. It is fixed. The lightning side electrode metal fitting 17 provided at the lower end of the lightning protection insulator 15 has another lightning protection insulator 15 fixed by a bolt with the grounding side electrode metal fitting 16, and the lightning side electrode 15 of the lightning protection insulator 15 An arc horn 18 on the ground side, which faces the arc horn 12 on the voltage application side, is attached to the metal fitting 17 with a predetermined air discharge gap G.

The arc horn 18 is located on a perpendicular line H passing through the arc horn 12 as shown in FIG. Further, an arcuate portion 18a having substantially the same curvature as the swing locus T of the jumper wire 10 is fixed to the arc horn 18, and the arc horn 1
The air discharge gap G is kept constant when 2 pivots along the swing locus T about the hanging point O above the jumper wire 10.

The position of the arc horn 12 in the line direction is preferably in the vicinity of the central portion of the jumper wire 10 in order to protect the flashover of the insulator 5 regardless of the direction in which the lightning surge enters.

Here, in order to normally operate the arc horns 18 and 12 of this device, the insulation strength of the lightning protection horn insulator device including the air discharge gap G is to withstand the operating voltage and the switching surge voltage generated in the line, and to prevent lightning surge. The voltage is set to a certain value or less for the purpose of protecting the tension insulator 5, and the tension insulator 5 is provided with an insulation margin.

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

Now, when an abnormally high voltage caused by a lightning stroke is applied to the power transmission line 7, the lightning surge current at this time passes through the jumper wire 10 and is appropriately maintained in the air discharge between the arc horn 12 and the arc horn 18. Discharged in the gap G, the electrode fitting 17 of the lower lightning protection insulator 15, the current limiting element 14 incorporated in the lightning protection insulator, the electrode fitting 16, the electrode fitting 16 of the upper lightning protection insulator 15, the current limiting element 14, the electrode fitting It flows to the support arm 1 through 16 and the mounting adapter 13, and is discharged to the tower body. Further, the subsequent arc of the operating voltage generated thereafter is cut off by the air discharge gap G and the current limiting element 14.

Further, in the mounted state, even if the jumper wire 10 swings in the direction perpendicular to the track due to swaying due to wind pressure or the like on the jumper wire 10, the arc horn 18 is located on the perpendicular line H in the embodiment of the present invention. Moreover, as shown in FIG. 1, since the arc horn 18 has the arcuate portion 18a, the air discharge gap G does not substantially change, and as a result, the electrical reliability of the device can be improved. it can.

Further, in the embodiment of the present invention, the upper portion of the lightning arrester 15 is located outside the perpendicular line H by the mounting adapter 13 and the lower end is located on the perpendicular line H and is oblique, so that it is applicable to a large line voltage. The long lightning arrestor 15 can be easily attached to the existing tower body by separating the long length of the lightning arrestor 15 from the space between the support arm 1 and the arc horn 12 except the lower end.

 Further, the present invention can be implemented as follows.

(1) As shown in FIG. 3, in the embodiment shown in FIG. 1, connecting a support insulator 21 between the lower lightning protection insulator 15 and the support arm 1 to support the load of the lightning protection insulator 15. .
Further, as shown by the chain line in FIG. 3, the support insulator 21 should be installed obliquely.

(2) As shown in FIG. 4, an upper lightning arrestor 15 is vertically suspended and fixed to the tip of the support arm 1 by a mounting adapter 13 higher than the tip, and a support metal fitting is attached to the lower end of the lightning arrester 15.
The lightning protection insulator 15 on the lower side is inclinedly connected via 21 and the arc horn 18 at the lower end thereof is positioned on the perpendicular line H passing through the arc horn 12.

(3) In the embodiment shown in FIG. 4, as shown in FIG.
Support the lightning protection insulator 15 with the support insulator 21. Also, the fifth
The support insulator 21 should be slanted as shown by the chain line in the figure.

(4) In the embodiment shown in FIG. 4, connect a support insulator between the support arm 1 and the intermediate electrode 22 as shown in FIG.

(5) As shown in FIG. 7, the lower lightning arrester 15 should be positioned on the perpendicular line H, and the upper lightning arrestor 15 should be inclined.

(6) In the embodiment shown in FIG. 7, as shown in FIG. 8, the support insulator 21 should be connected obliquely between the support arm 1 and the intermediate electrode 22.

(7) As shown in FIG. 9, the upper and lower lightning arresters 15 are connected by the intermediate electrode plate 23 so that the upper lightning arrestor 15 is horizontally separated from the vertical line H, and the lower lightning arrester 15 is positioned on the vertical line H. To let.

(8) As shown in FIG. 10, connect the upper and lower lightning protection insulators 15 in a dogleg shape and position the arc horn 18 on the vertical line H.

(9) As shown in FIG. 11, the lightning protection insulator 15 is bent and installed in a horizontal V shape in the inner space of both the tension insulators 5 and 5, and the arc horn 18 at the lower end thereof is positioned on the perpendicular line H. thing.

Effects of the Invention As described in detail above, the present invention makes it easy to form an air discharge gap between the arc horn on the jumper wire side and the arc horn on the lightning arrestor side, and even if rolling occurs due to wind pressure of the jumper wire, The discharge gap between the arc horns on the power supply side and the grounding side can be kept constant at all times to stabilize the discharge characteristics, and a long lightning arrestor for high line voltage can be easily installed on the existing tower body. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment embodying the present invention,
2 is a front view of FIG. 1, FIGS. 3 to 10 are side views showing another example of the present invention, and FIG. 11 is a front view showing another example of the present invention. 1 ... Support arm, 5 ... Tensile insulator, 10 ... Jumper wire, 11 ... Mounting member, 12 ... Electric arc side horn, 13
...... Mounting adapter, 14 ...... Current limiting element, 15 ...... Lightning arrester,
16,17 …… Electrode metal fittings, 18 …… Ground side arc horn, 18a
...... Arc-shaped part, 21 …… Support insulator, 22 …… Intermediate electrode, 23 ・ ・ ・
... Intermediate electrode plate, H ... Vertical line passing through the arc horn 12 on the charging side, O ... Hanging point of jumper wire 10, G ... Discharge gap,
T: Swing locus of jumper wire 10.

Claims (2)

(57) [Claims] 1. A tension insulator (5) is connected to a support arm (1) of a tower body through a pair of left and right tower side connecting metal fittings (4), and an electric wire is connected to the tension insulator (5). The power transmission line (7) is installed via the side connecting fittings (6), and the jumper wire (10) is installed between the two wire side connecting fittings (6, 6).
On the other hand, a lightning protection insulator (15) having a built-in current limiting element (14) mainly made of zinc oxide or the like having a non-linear voltage-current characteristic is mounted on the support arm (1) via a mounting adapter (13). A lightning protection horn, which is supported and mounted so that the arc horns (12, 18) on the power-supply side and the grounding side face the jumper wire (10) and the lightning protection insulator (15) with a predetermined air discharge gap (G). In the insulator device, the grounding side arc horn (18) on the side of the lightning arrestor (15) is positioned on a perpendicular line (H) passing through the arc horn (12) on the side of charging, and the upper end of the lightning insulator (15) or A lightning protection horn insulator device in which an intermediate portion is laterally displaced. 2. The arc horn (18) on the grounding side has an arcuate portion (18) having substantially the same curvature as the swing locus of the jumper wire (10).
The lightning protection horn insulator device according to claim 1, comprising a).