JP2941985B2 - Induction structure of arc in electric line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc guiding structure for guiding an arc from the insulator side to the tip of an arcing horn when a creepage flash occurs on an insulator supporting an electric wire.

[0002]

2. Description of the Related Art Conventionally, in an insulator device in which an electric wire is supported by an insulator in an electric wire path, arcing horns are provided at upper and lower ends of the insulator through mounting brackets to prevent damage due to creeping flash of the insulator. Had become. In addition, the applicant of the present invention has filed a patent application (Japanese Patent Application No. 2-2807).
In No. 24), an annular current transformers fitted with coupling attached to the outer peripheral surface of the cantilevered upper arcing horn, and proposed a mounting structure for a current transformer which is configured to detect an accident current.

[0003]

[0008] However, in this prior arrangement, since the current transformer is if attached fitted to the outer peripheral surface <br/> of the upper arcing horn, blende in insulator creepage due to fouling of the insulator If entanglement occurs, start from the proximal end of the arcing horn.
In some cases , the arc that is going to move to the end is blocked by the current transformer and stalled, making it difficult for the arc to move from the insulator side to the tip of the arcing horn , so that the fault current cannot be detected.

[0004] The present invention has been made in view of the problems existing in such prior art, and an object of the present invention is to provide a case where flashover occurs along the insulator surface due to the contamination of the insulator. However, the arc smoothly transitions from the insulator side to the arcing horn tip without the arc stagnation at the current transformer attachment part, providing an arc induction structure in the electric wire line that can reliably detect the fault current. Is to do.

[0005]

In order to achieve the above object, an arc guiding structure for an electric wire according to the present invention comprises an arcing horn equipped with a current transformer for detecting a fault current. In the insulator device, an arc derivative is provided at the tip of the arcing horn so as to bypass the outside of the current transformer so as to induce an arc from the insulator side to the arcing horn when the insulator is creepage-flashed.

[0006]

In the arc guiding structure in the electric line constructed as described above, if flashover occurs along the insulator surface due to the contamination of the insulator, the arc does not stagnate at the current transformer mounting portion, and the arc side does not stagnate. Transitions smoothly from the top to the arcing horn tip. Therefore, the fault current can be reliably detected by the current transformer.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an arc guiding structure in an electric wire according to the present invention will be described below in detail with reference to the drawings. As shown in FIG. 2, the supporting arm 1 of the tower has a hanging metal fitting 2 attached to the lower surface of the tip thereof, and the hanging metal fitting 2 is connected to the upper horn mounting metal 4 via the U clevis 3. The insulator 5 is suspended and supported by the upper horn mounting bracket 4 so as to be swingable in a line direction and a direction orthogonal thereto. In this embodiment, the insulator 5 is constituted by a suspension insulator series in which a plurality of suspension insulators 6 are connected in series. . The lower horn support member 7 is connected to a lower end portion of the insulator 5, and an electric wire clamp 10 for supporting the transmission line 9 via a connection link 8 is attached to the lower horn mounting member 7.

A pair of upper arcing horns 11 are attached to the upper horn mounting bracket 4 by a plurality of bolts 12. The pair of lower arcing horns 13 are attached to the lower horn mounting bracket 7 by a plurality of bolts 14.
The ring-shaped current transformer 15 is fitted to the upper arcing horn 11 from the tip side thereof, and the current transformer 15 detects an accident current such as a ground fault current.

Therefore, the mounting structure of the current transformer 15 will be described. As shown in FIGS. 1, 3 and 4, a pair of clamps 16 and 17 are attached to the base end of the upper arcing horn 11 from both sides. They are joined and fastened and fixed to each other by bolts 18 and nuts 19. The mounting portion 20 is provided at a lower portion of one of the clamps 16 and has a screw hole 21 formed on a lower surface thereof.

The mounting bracket 22 is joined to the lower surface of the mounting section 20 of the clamp 16 at the base end, and is fixed to the mounting section 20 by a bolt 23 screwed into a screw hole 21.
Side shape substantially U-shaped so as to bypass the outer peripheral surface of current transformer 15
The support portion 24 is connected to the distal end of the mounting bracket 22, and a support disk 25 is erected and fixed on the upper portion on the base end side. The engaging pieces 26 and 27 are bent upward from both sides of the base end of the mounting bracket 22, and the engaging pieces 26 and 27 are engaged with both side surfaces of the mounting portion 20 of the clamp 16, so that the mounting bracket 22 is formed. It is locked against the clamp 16. The support band 28 is attached to an upper portion of the support disk 25 and extends annularly above the support portion 24.

1 and 3, the current transformer 15 is mounted on the support portion 24 in a state of being inserted into the upper arcing horn 11, and the current transformer 15 is attached to the support disk 25 on one side. It is joined and held, and is hooked and supported by a support band 28 at the upper part. In this embodiment, the clamps 16 and 17 , the mounting 22 and
U-shaped so as to bypass the outer peripheral surface of the current transformer 15
An arc derivative extending so as to bypass the lower outside of the current transformer 15 is formed by the support portion 24. When the insulator 5 is creepage-flashed, an arc is applied from the insulator 5 side to the tip of the upper arcing horn 11 via the arc derivative. Is to be induced.

Next, the operation of the insulator device in the electric line configured as described above will be described. In this insulator device, when flashover occurs along the insulator surface due to the contamination of the insulator 5, the arc is supplied from the insulator 5 side to the clamps 16, 17 as an arc derivative and the mounting metal 22 to the support portion 24.
, And smoothly moves to the tip of the upper arcing horn 11. Therefore, the arc is interrupted by the current transformer 15 .
The current transformer 15 can reliably detect the fault current caused by the creeping flashover without stagnation.

The present invention is not limited to the configuration of the above-described embodiment. For example, the present invention is not limited to the clamps 16 and 17 for mounting the current transformer 15 and the mounting 22 for inducing an arc. Arc derivative, current transformer 1
The configuration of each unit may be arbitrarily changed and embodied without departing from the spirit of the present invention, for example, by providing the configuration so as to bypass the outside of 5.

[0014]

Since the present invention is configured as described above, even if a flashover occurs along the insulator surface due to the contamination of the insulator, the arc is not interrupted by the current transformer and stagnates. The smooth transition from the insulator side to the tip of the arcing horn provides an excellent effect that the fault current can be reliably detected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of an arc guiding structure in an electric wire line embodying the present invention.

FIG. 2 is a front view illustrating the entire configuration of supporting a transmission line in a power line.

FIG. 3 is a cross-sectional view taken along line AA of FIG.

FIG. 4 is an exploded perspective view showing main components of the arc guiding structure.

[Explanation of symbols]

5 insulator, 9 transmission line, 11 upper arcing horn,
15 Current transformer, 16, 17 Clamp fitting constituting arc conductor, 22 Mounting fitting constituting arc conductor ,
24 A support part constituting the arc derivative .

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int.Cl. ⁶ , DB name) H01F 38/28 H01T 4/14 H01T 15/00 H02G 7/00 H01H 73/18 G01R 31/00 H01B 17 / 00

Claims (1)

(57) [Claims] An insulator device for an electric wire path provided with an arcing horn for preventing damage to the insulator supporting the electric wire due to creeping flashing, and a current transformer for detecting an accident current in the arcing horn. At the time of creepage flashing of the insulator, an arc derivative is provided on the arcing horn so as to guide an arc from the insulator side to the tip of the arcing horn while bypassing the outside of the current transformer. Guidance structure.