JPH0793065B2 - Lightning protection horn insulator device - Google Patents

Description

Description: [Industrial application] The present invention promptly grounds an abnormally high voltage caused by lightning when applied to a power transmission line, and sends it by a continuous-current arc that occurs thereafter. The present invention relates to a lightning protection horn insulator device for an overhead power transmission line for preventing the electric wire from being blown, and particularly, a lightning protection horn insulator device using a tension insulator.

[Prior Art] As a conventional lightning protection horn insulator device of this type, for example,
The structure shown in JP-A-61-296609 or JP-A-62-5520 is known.

In the former lightning protection horn insulator device, the tension insulator is connected to the tip of the support arm of the tower body via the tower side connecting metal fitting, and the electric wire is erected on the tension insulator by the wire side connecting metal fitting. The lightning protection insulator is attached to the tower-side connecting fitting in a cantilever state via a mounting fitting so as to be located above the tension insulator, and the discharge electrode on the power-supply side is upwardly attached to the wire-side connecting fitting. In addition to being supported, the grounding side discharge electrode is supported at the tip of the lightning protection insulator, and both discharge electrodes face each other with a predetermined air discharge gap.

In the latter lightning protection horn insulator device, the tension insulator is connected to the tip end of the support arm of the tower body through the tower side connecting metal fitting, and the electric wire is connected to the tension insulator via the wire side connecting metal fitting. A lightning arrestor is attached to the tip of the support arm via a mounting metal fitting so as to extend substantially horizontally in a direction orthogonal to the path, and the electric discharge side discharge electrode is attached to the wire side connecting metal fitting. And a grounding side discharge electrode is supported at the tip of the lightning protection insulator, and both discharge electrodes face each other with a predetermined air discharge gap.

[Problems to be Solved by the Invention] However, in the former conventional device, since the lightning arrestor is arranged almost horizontally above the tension insulator, in the steel tower with a short arm interval, the insulation interval between the upper phases is reduced. There is a problem in that it cannot be sufficiently secured and it is difficult to apply it to an existing tension-resistant insulator device.

In the latter conventional device, the lightning arrestor is attached so as to project outward from the tip of the support arm.Therefore, when attaching and fixing the lightning arrestor to the support arm on the tower body, Therefore, the mounting work must be performed while supporting the weight of the lightning arrestor, and although there is a point that it is not affected by the extension length of the arm, the work is very complicated and takes time.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and an object thereof is to sufficiently secure an insulation interval between upper phases even if the arm interval is short. Therefore, it can be easily applied to an existing tension-resistant insulator device, and the work of installing the lightning arrestor can be performed easily and in a short time at the middle portion of the horizontal angle member that constitutes the support arm. Another object of the present invention is to provide a lightning protection horn insulator device capable of easily adjusting the discharge gap.

[Means for Solving the Problems] In order to achieve the above object, in the lightning protection horn insulator device of the present invention, the tension insulator is connected to the tip end portion of the support arm of the tower body through the tower side connecting metal fitting. At the same time, an electric wire is installed on the tension insulator via a wire-side connecting metal fitting, and a mounting metal fitting is attached to the middle portion of the horizontal angle member forming the support arm, and the horizontal position adjustment is performed on the mounting metal fitting. The lightning protection insulator is attached so that it extends almost horizontally in the extension direction of the strength insulator through the mechanism, and the electric discharge side electrode is supported by the wire side connecting metal fitting and at the tip of the lightning protection insulator. Is a device that supports the ground-side discharge electrode and opposes both discharge electrodes with a predetermined air discharge gap.

[Operation] In the lightning protection horn insulator device configured as described above, since the lightning protection insulator is attached to the middle portion of the support arm so as to extend substantially horizontally in the extension direction of the tension protection insulator. Since the lightning protection insulator is not arranged close to the upper phase tension insulator or the like, it is possible to secure a sufficient insulation interval between the upper phases. Also, since the lightning arrestor can be attached at the middle part of the horizontal angle member that constitutes the support arm, unlike the configuration in which the lightning arrestor is attached to the outer end of the support arm, the lightning arrestor attachment work is easy. Can be converted.

Further, since the lightning protection insulator is supported by the mounting member via the position adjusting mechanism so that the position can be adjusted in the horizontal direction, the discharge gap between both discharge electrodes can be easily adjusted.

[Embodiment] An embodiment of a lightning protection horn insulator device embodying the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, a support plate 1 is attached to the support arm 1 of the tower body.
Are fixed by bolts 3. Tensile insulators 5 are connected and supported at both left and right ends of the mounting plate 2 via tower-side connecting fittings 4, respectively. 7 is erected and supported. The connecting horns 4 and 6 on the tower side and the wire side have arcing horns 8 and 9
Are provided so as to face each other. Further, although not shown, jumper wires are connected and fixed to both the electric wire side connecting fittings 6 at both ends, and extend in an arc shape between the both electric wire side connecting fittings 6.

A lightning protection insulator 10 is attached to a middle portion of the horizontal angle member 1a constituting the support arm 1 through a mounting bracket 11 so as to extend substantially horizontally in parallel with one of the tension-resistant insulators 5. There is. As shown in FIG. 2 and FIG.
Is a pair of upper and lower mounting plates 14 and 15 each having a substantially L-shaped cross section fixed to each other by a plurality of bolts 12 and nuts 13 with the support arm 1 held therebetween, and a pair of bolts 1 on the upper mounting plate 14.
6 and a support plate 18 fixed by a nut 17, and the lightning protection insulator 10 is fixed by a pair of bolts 19 to the bent end of the support plate 18.

A circular arc-shaped long hole 20 is formed on the support plate 18 at a portion where the bolt 16 is inserted, and the support plate 18 is rotationally adjusted with respect to the upper mounting plate 14 within the range of the long hole 20. Thus, a mechanism for adjusting the arrangement position of the lightning protection insulator 10 in the horizontal direction is configured.

The lightning protection insulator 10 includes a voltage-proof insulating cylinder (not shown) formed in a cylindrical shape by a tension-resistant material such as FRP, and a voltage mainly composed of zinc oxide (ZnO) housed in series therein. A current limiting element (not shown) whose current characteristics are non-linear, and cap-shaped ground-side and power-supply-side electrode fittings 21 and 22 that are fitted and fixed at both ends of the pressure-proof insulating tube, and the pressure-proof insulating tube It is composed of a mold rubber 23 provided on the outer periphery. Arcing rings 24 and 25 are provided on the metal fittings 21 and 22 of the lightning protection insulator 10 so as to face each other, and the arcing rings 24 and 25 reduce damages of the mold rubber 23 when the surface flashes.

As shown in FIG. 1, a discharge electrode 26 on the voltage applying side is attached to the wire-side connecting fitting 6 of the one tension-resistant insulator 5. Further, a discharge electrode 27 on the ground side is attached to the electrode-side electrode metal fitting 22 on the tip of the lightning protection insulator 10. The discharge electrodes 26 and 27 on the charging side and the grounding side are arranged opposite to each other with a predetermined air discharge gap G, and the lightning protection insulator 10 is rotationally adjusted within the elongated hole 20 on the support plate 18. Thus, the gap length of this air discharge gap G can be arbitrarily set.

A discharge portion 27a is attached to the tip of the discharge electrode 27 in the vertical direction (a direction substantially orthogonal to the paper surface of FIG. 1), and the discharge gap G is almost constant even if the tension insulator 5 swings in the vertical direction. It is kept constant. Further, the tip of the discharge electrode 26 is projected toward the tower side from the discharge part 27a so that the discharge gap G is kept substantially constant even if the tension insulator 5 swings in the horizontal direction.

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

In this lightning protection horn insulator device, when a surge current caused by a lightning strike is applied to the power transmission line 7, the current is discharged in the air gap G between the discharge electrodes 26, 27 and built in the lightning arrester 10. It flows into the support arm 1 of the tower through the current limiting element and the mounting bracket 11 and is discharged from the tower to the ground. Further, the subsequent current generated thereafter is suppressed and blocked by the air discharge gap G between the discharge electrodes 26 and 27 and the current limiting element in the lightning arrester 10.

By the way, in the lightning protection horn insulator device of this embodiment, the lightning protection insulator 10 is provided in the middle portion of the support arm 1 and the tension protection insulator 5 is provided.
Since it is attached so as to extend in a substantially horizontal direction in the overhang direction of the lightning protection insulator, unlike the conventional configuration in which the lightning protection insulator is arranged almost horizontally above the tension protection insulator, It is not placed close to the insulator 5 or the like. Therefore, it is possible to secure a sufficient insulation interval between the upper phases, and it is possible to easily apply it to the existing tension-resistant insulator device.

Further, in the device of this embodiment, since the lightning protection insulator 10 can be mounted at the intermediate portion of the support arm 1,
Unlike the conventional structure in which the lightning arrestor is attached by projecting outward from the tip of the support arm, it does not require the complicated work of mounting while supporting the weight of the lightning insulator on the outer side of the tip of the support arm. The work of mounting the lightning protection insulator 10 can be performed easily and in a short time.

Further, since the lightning protection insulator 10 is supported by the mounting member 11 via the position adjusting mechanism so that the position can be adjusted in the horizontal direction, the discharge gap G between the discharge electrodes 26 and 27 can be easily adjusted.

[Advantages of the Invention] Since the present invention is configured as described above,
The insulation gap between the upper phases can be sufficiently secured, and it can be easily applied to the existing tension-resistant insulator device, and at the same time, the lightning protection insulator can be mounted in the middle part of the horizontal angle member that constitutes the support arm. This has an excellent effect that the work can be performed easily and in a short time, and the discharge gap between the discharge electrodes can be easily adjusted.

[Brief description of drawings]

FIG. 1 is a plan view of a lightning protection horn insulator device embodying the present invention, FIG. 2 is a partial plan view showing a mounting portion of a lightning protection insulator in an enlarged manner, and FIG. 3 is a line AA of FIG. FIG. 1 ... Support arm, 1a ... Horizontal angle member, 4 ... Tower side connecting metal fitting, 5 ... Tensile insulator, 6 ... Electric wire side connecting metal fitting,
7 ... Transmission line, 10 ... Lightning arrester, 11 ... Mounting bracket, 16 ...
… Bolts, 17 …… nuts, 18 …… support plates, 20 …… oblong holes,
26: Discharge electrode on the charging side, 27 ... Discharge electrode on the ground side, G
…… Air discharge gap.

Claims (1)

[Claims] 1. A tension insulator (5) is connected to the tip end of a support arm (1) of the tower body via a tower side connecting metal fitting (4), and a wire side connection is made to the tension insulator (5). An electric wire (7) is installed via a metal fitting (6), and a mounting metal fitting (1) is attached to an intermediate portion of a horizontal angle member (1a) constituting the support arm (1).
1) is attached, and the lightning protection insulator (10) is attached to the fitting (11) through a horizontal position adjusting mechanism so that the lightning protection insulator (10) extends substantially horizontally in the extension direction of the tension resistant insulator (5). While supporting the discharge electrode (26) on the charging side on the wire side coupling fitting (6) and the discharge electrode (27) on the ground side at the tip of the lightning protection insulator (10), both discharge electrodes ( 26, 27) are opposed to each other with a predetermined air discharge gap (G), and a lightning protection horn insulator device.