JPH0834068B2 - Lightning arrester device for overhead power lines - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lightning arrester device for an overhead power transmission line.

[Prior Art] Japanese Patent Laid-Open No. 62-90 as a conventional lightning arrester device for an overhead power transmission line.
The one shown in Japanese Patent No. 815 has been proposed. This device hangs a suspension insulator string in which a large number of suspension insulators are connected in series to a support arm of a steel tower via an upper suspension bracket, and a lower suspension bracket and a wire clamp are attached to the lower end of the suspension insulator string. Supports the transmission line through. Further, a mounting adapter is supported on the upper suspension metal fitting, and a lightning protection insulator having a built-in current limiting element mainly made of zinc oxide having a non-linear voltage-current characteristic is suspended at the tip of the adapter. The grounded discharge electrode, which is fixed and provided at the lower end of the lightning protection insulator, and the discharge electrode on the power supply side, which is cantilevered by the lower suspension fitting, face each other with a predetermined air discharge gap.

On the other hand, arc horns on the grounding side and the charging side for preventing creeping flash on the surface of the suspension insulators are similarly arranged to face each other in the upper suspension fitting and the lower suspension fitting with a predetermined air discharge gap. .

[Problems to be Solved by the Invention] However, in the conventional lightning arrester device, the length of the arc horn on the charging side is shorter than the length of the discharge electrode on the charging side, and therefore the weights of the two become unbalanced, In the case of a transmission line in which the self-weight of the transmission line is light and the vertical load is relatively small, the discharge electrodes on the charging side and the arc horn easily swing alternately in the vertical direction, and the discharge gap of the discharge electrode and the arcing horn There is a problem that the discharge gap becomes unstable and the lightning protection device lacks reliability.

An object of the present invention is to solve the problems existing in the above-mentioned conventional lightning arrester device, stably support the discharge electrode and the arc horn on the voltage applying side, and improve the reliability of the transmission lightning arrester. To provide a device.

[Means for Solving the Problem] In order to achieve the above object, the present invention hangs a support insulator on a support arm via an upper horn mounting bracket, and a lower horn mounting bracket and a lower horn mounting bracket are provided at the lower end of the supporting insulator. A power line is installed via a wire clamp, and a voltage-
A lightning arrestor with a built-in current limiting element with non-linear electric wire characteristics is attached, and the discharge electrode on the power-supply side provided on the lower horn mounting bracket and the discharge electrode on the ground side provided on the lightning arrester are connected to the specified In the lightning arrester device, which is opposed to each other with a middle discharge gap, and in which the upper and lower horn mounting metal fittings are provided with a grounding side and a charging side arc horn for preventing surface flashover of the supporting insulator, The arc horn on the charging side is made large in diameter so that the discharge electrode and the weight are balanced.

[Operation] In the lightning arrester device of the present invention, the weight of the discharge electrode on the charging side and the weight of the arc horn on the charging side are balanced, so when the power transmission line sways due to wind pressure, etc. The discharge electrode and arc horn of No swing alternately up and down,
Therefore, the air discharge gap between the discharge electrode on the power supply side and the discharge electrode on the ground side and the air discharge gap of the arc horn on the power supply side and the ground side to prevent creeping flashing of the support insulator are almost constant. The electrical reliability is improved.

[Embodiment] An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 3.

A suspension fitting 2 is fixed to a support arm 1 of a steel tower by a bolt, a U clevis 3 is locked to the suspension fitting 2, and an upper horn mounting bracket 4 is connected to the U clevis 3.
Further, the horn mounting member 4 is connected to an upper end portion of a suspension insulator series 5 as a support insulator formed by connecting a large number of suspension insulators in series. Further, a lower horn mounting member 7 is connected to a lower end portion of the suspension insulator string 5 via a parallel clevis 6, a connecting link 8 is connected to the horn mounting member 7, and a wire clamp is connected to the connecting link 8. A power transmission line 10 is installed via 9.

The right arm portion 7a of the lower horn mounting bracket 7 cantileverly supports a discharge electrode 11 on the power-supply side that opposes a discharge electrode 19 on the ground side, which will be described later, with a predetermined air discharge gap G1. Further, the arm horns 4a, 4b and 7b of the upper and lower horn mounting brackets 4 and 7 are provided with arc horns 12 and 13 on the grounding side and the charging side for preventing creeping flash on the surface of the suspension insulator series 5. It is supported in a cantilever manner so as to face each other with a predetermined air discharge gap G2. Then, the arc horn 13 on the charging side is formed with a large diameter so as to balance with the weight of the discharge electrode 11 on the charging side,
When the power transmission line 10 swings due to wind pressure or the like, the discharge electrode 11 and the arc horn 13 are 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. 2, and a grounding side electrode fitting 16 of a lightning protection insulator 15 is fixed to the adapter 14 by bolts. This lightning protection insulator 15 is a pressure-resistant insulating cylinder (not shown) such as FRP.
In addition to incorporating a current limiting element (not shown) mainly composed of zinc oxide whose voltage-current characteristics are non-linear in the inside of the, the metal fitting 16 on the ground side and The electrode fitting 17 is fitted and fixed, and an insulating jacket is rubber-molded on the outer surface of the pressure-proof insulating cylinder. The grounding-side discharge electrode 19 is supported on the charging-side electrode fitting 17 so as to face the charging-side discharge electrode 11 with a predetermined air discharge gap G1.

Next, the operation of the lightning arrester device for an overhead power transmission line configured as described above will be described.

Now, when a surge current due to a lightning strike occurs on the transmission line 10,
This surge current is applied to the connecting link 8 and the lower horn mounting bracket 7.
The discharge electrode 11 on the charging side is flashed over to the discharge electrode 19 on the ground side through the electrode metal fitting 17 of the lightning arrestor, the electrode metal fitting 16 on the grounding side of the current limiting element (not shown), the mounting adapter 14, and the support arm 1. Is discharged to the tower. Further, the subsequent current generated thereafter is suppressed and cut off by the current limiting element and the air discharge gap G1.

Now, in the embodiment of the present invention, the lower horn mounting bracket 7
In contrast, the discharge electrode 11 on the charging side and the arc horn 13 on the charging side
Since the diameter of the arc horn 13 is increased so that and are balanced in weight, even if the transmission line 10 swings due to wind pressure, etc.
11 and the arc horn 13 will no longer swing up and down alternately. Therefore, the air discharge gaps G1 and G2 are kept substantially constant, and the electrical reliability of the lightning arrester device is improved, and even if the tip of the arc horn 13 is melted due to abnormal discharge such as direct lightning, a large diameter As a result, the progress of wear can be reduced and fluctuations in the air discharge gap G2 can be suppressed.

The present invention is not limited to the above embodiment, but can be embodied as follows.

(1) In the above-mentioned embodiment, the arc horn 13 on the side of voltage application is integrally formed of the same material, but as shown in FIG. 4, inside the pipe 23, for example, lead 24 having a larger specific gravity than the material of this pipe is used. (2) Filling 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 inclination angle in the vertical direction with respect to the discharge electrode 11 on the charging side and the base ends of the arc horn 13, the arm portions 7a, 7b of the lower horn mounting bracket 7 are adjusted. On the other hand, form the long hole 7c in an arc shape and fasten it with bolts 26 and 27.

(3) In order 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) Mount the lightning protection insulator 15 on the arm portion 4a of the horn mounting bracket 4, and increase the diameter of the arc horn 12 to balance it with the lightning protection insulator 15.

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

[Brief description of drawings]

1 to 3 show an embodiment in which a lightning arrester device for an overhead power transmission line of the present invention is embodied. FIG. 1 is a front view of the entire device, FIG. 2 is a plan view of the same, and FIG. Similarly right side view,
FIG. 4 is a sectional view of an essential part showing another example of the present invention, and FIG. 5 is a front view of an essential part showing another example of the present invention. 1 ... Support arm, 4 ... Upper horn mounting bracket, 5 ...
Suspension insulator string as a support insulator, 7 ...... lower horn mounting bracket, 9 ...... wire clamp, 10 ...... transmission line, 11 ...... arc horn as discharge electrode on the charging side, 12 (13) ...... ground ( (Power supply) side arc horn, 14 ... Mounting adapter, 15 ...
… Lightning arrester, 19… Arc horn as discharge electrode on the ground side.

Claims (1)

[Claims] 1. A support insulator (5) is hung from a support arm (1) through an upper horn mounting bracket (4), and a lower horn mounting bracket (7) is attached to the lower end of the supporting insulator (5). Further, a power transmission line (10) is installed via a wire clamp (9), and a lightning arrester (15) having a built-in current limiting element having a non-linear voltage-wire characteristic is attached to the support arm (1) side. A predetermined air discharge gap (G1) between the discharge electrode (11) provided on the lower horn mounting member (7) and the ground side discharge electrode (19) provided on the lightning protection insulator (15). And the arc horns (12, 13) on the grounding side and the charging side for preventing the surface flashover of the support insulator (5) are attached to the upper and lower horn mounting brackets (4, 7). In the lightning protection insulator device described above, the arc horn (13) on the charging side is thickened so that the weight is balanced with the discharge electrode (11) on the charging side. A lightning protection device for an overhead power transmission line characterized by having a diameter.