JPH10255570A - Arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance are extinguishing performance and easily interrupt dynamic current by securing an insulator having a power line support metal fitting in its bottom part for securing one end of a second electrode with the other end being a discharge part to a bottom part of a main body of a lighting conductor suspended and supported by the other support arm for supporting and suspending, and coiling at least one of the first and second electrodes with the other end being a discharge part. SOLUTION: A power line support metal fitting 13 at the bottom of an insulator 12 to be suspended at one end of a support arm 11 supports a power line 14, secures a support terminal 20, and secures a terminal 17a to a bottom of an insulation container 16 suspended at the other end thereof and housing arrester element 17. This metal fitting consists of a coil of an insulation covering conductor, and first and second electrodes 18 and 19 of identical winding directions are secured to the terminal 17a and the support terminal 20. A high-voltage surge due to lighting advances the power line 14, is discharged at a discharge gap between the discharge parts 18a and 19a of both electrodes, and when a arrester operating current flows an arc 21 is spirally driven and cooled by a magnetic field F generated between center spaces of the electrodes 18 and 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester installed on a power transmission tower or the like, and more particularly to an improvement in an electrode portion facing a power line and a lightning arrester via a discharge gap.

[0002]

2. Description of the Related Art FIG. 5 is a side view showing the structure of a conventional lightning arrester disclosed in, for example, Japanese Utility Model Application Laid-Open No. 4-24228, and FIG. It is a characteristic diagram. In the figure, 1 is a support arm fixed to a power transmission and distribution tower (not shown), 2 is an insulator suspended and supported at one end of the support arm 1, and 3 is provided at the bottom of the insulator 2 to support the power line 4 overhead. Power line support bracket,
Reference numeral 5 denotes a lightning arrester 7 such as a fired body containing zinc oxide as a main component and a terminal 7a provided at the bottom of the insulating container 6 formed of a tubular insulator. The lightning arrester 5 is suspended from the other end of the support arm 1. The lightning arrester main body 8 has one end fixed to a terminal 7a of the lightning arrester main body 5 and the other end serving as a discharge portion 8a.
9 has one end fixed to the power line support fitting 3 and the other end
a, the second electrode 10 facing the discharge portion 8a of the first electrode 8 via the discharge gap G is an arc flowing when the lightning arrester operates.

Next, the operation will be described. In the lightning arrester configured as described above, for example, when a high voltage surge due to a lightning strike enters the power line 4, the discharge gap between the discharge portion 8a of the first electrode 8 and the discharge portion 9a of the second electrode 9 The discharge occurs at G, and the lightning arrester 7 having a variable resistance operates, and as shown in FIG. 6, the surge arrester operating current flows to suppress the surge voltage. After removal of the high voltage surge, a current (hereinafter referred to as a “continuous current”) corresponding to the transmission voltage flows as an arc 10 through the lightning arrester 7 and the discharge gap G, but since the current value is usually as small as about 1 amp, the discharge gap G continues. The operation of the lightning arrester is completed by interrupting the flow by itself.

[0004]

Since the conventional lightning arrester is constructed as described above and is used outdoors, the outer surface of the insulating container 6 of the lightning arrester main body 5 has an insulation resistance due to adhesion of dust or salt. descend. For this reason, the current value of the continuation current supplied to the discharge gap G after the operation of the lightning arrester 5 becomes several times or more the normal value, and there is a problem that it is difficult to cut off the power by the discharge gap G by itself.

The present invention has been made to solve the above problems, and has as its object to provide a lightning arrester that facilitates blocking of a downstream current by improving arc extinguishing performance.

[0006]

According to a first aspect of the present invention, there is provided a lightning arrester comprising: an insulator suspended and supported by one of fixed support arms; and a power line support provided at the bottom of the insulator to support the power line overhead. A metal fitting, a lightning arrester main body formed to house the lightning arrester in a tubular insulating container and suspended from the other of the support arms, and one end fixed to the bottom of the lightning arrester main body and the other end serving as a discharge unit. A lightning arrester including one electrode and one end fixed to the power line support bracket and the other end serving as a discharge portion and facing the first electrode via a discharge gap. One is formed in a coil shape.

According to a second aspect of the present invention, there is provided a lightning arrester comprising: an insulator suspended and supported by one of the fixed support arms; a power line support bracket provided on the bottom of the insulator for supporting the power line overhead; A lightning arrester main body formed to house the lightning arrester element in the insulating container and suspended and supported by the other of the support arms, a first electrode having one end fixed to the bottom of the lightning arrester main body and the other end serving as a discharge portion; A lightning arrester having one end fixed to the power line support bracket and the other end serving as a discharge portion, and the first electrode facing a second electrode via a discharge gap, wherein at least one of the two electrodes is intermittently connected. A current path is formed from one end to the other end in a ring shape having a portion, and a plurality of coil pieces stacked while shifting the intermittent portion in the circumferential direction, and the intermittent portion is formed in a ring shape having an intermittent portion. adjacent An insulating spacer interposed between the coil pieces so as to correspond to the other end of the one coil piece and one end of the other adjacent coil piece, and an intermittent portion of the insulating spacer. And a conductive spacer that is fitted into the other end of the coil piece and contacts the other end of the coil piece.

According to a third aspect of the present invention, there is provided the lightning arrester according to the first or second aspect, wherein a magnetic body is provided in a space formed at the center of the electrode.

According to a fourth aspect of the present invention, in the lightning arrester according to any one of the first to third aspects, the discharge portion of the electrode generates an arc-extinguishing gas by heating and has at least one through hole. An insulating member is fixed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a configuration of a lightning arrester according to Embodiment 1 of the present invention. In the figure, reference numeral 11 denotes a support arm fixed to a power transmission and distribution tower (not shown);
Is an insulator suspended from one end of the support arm 11, 13 is a power line support bracket provided on the bottom of the insulator 12 for supporting the power line 14 overhead, and 15 is a main component of, for example, zinc oxide in an insulating container 16 made of a tubular insulator. A lightning arrester main body, which is formed with a lightning arrester 17 such as a fired body and is provided with a terminal 17a at the bottom and is suspended and supported at the other end of the support arm 11, a coil-shaped conductor 18 is formed by forming an insulated conductor in a coil shape. A first electrode having one end fixed to a terminal 17a of the lightning arrester main body 17 and the other end serving as a discharge portion 18a, and a conductor coated with insulation is wound around the first electrode 18 in a winding direction. And one end thereof is fixed to a support terminal 20 fixed to the power line support bracket 13 with the center axis of the coil space in the vertical direction, and the other end becomes a discharge portion 19a to discharge the first electrode 18. A second electrode facing each other via 18a and the discharge gap G, 21 is indicative arcs flowing during lightning protection system operation, a magnetic field F is generated.

In the lightning arrester configured as described above, for example, when a high voltage surge due to a lightning strike enters the power line 14, the discharge portion 18a of the first electrode 18 and the discharge portion 19a of the second electrode 19 are connected. Discharge at the discharge gap G between
The surge arrester operating current flows by operating the lightning arrester 17 which is a variable resistor, and the surge current is suppressed as in the conventional case. However, when the lightning arrester 17 operates, the electrodes 18 and 19 formed in a coil shape are formed.
The magnetic field F generated in the central space of the arc acts between the discharge gaps G to drive and cool the arc 21 in a spiral manner, so that the arc 21, that is, the arc extinguishing ability of the continuation current is increased, and the continuation current having a large current value is increased. But it can be easily shut off.

In the above-described configuration, the case where both the first current 18 and the second electrode 19 are formed in a coil shape has been described. It is needless to say that a magnetic field can be generated at the same time, and a similar effect can be obtained. Although the electrodes 18 and 19 are made of conductors coated with insulation,
The bare conductor may be formed in a spiral shape.

Embodiment 2 FIG. FIG. 2 is an exploded perspective view showing a configuration of an electrode part of a lightning arrester according to Embodiment 2 of the present invention. In FIG. 2, reference numeral 22 denotes a ring having an intermittent portion 22a, a current path is formed from one end to the other end, a plurality of coil pieces stacked with the intermittent portion 22a shifted in the circumferential direction, and 23 denotes an intermittent portion 23a. And the intermittent portion 23a is interposed between the coil pieces 22 such that the intermittent portion 23a is located at a position corresponding to the other end of one adjacent coil piece 22 and one end of the other adjacent coil piece. The plurality of insulating spacers 24 are fitted into the intermittent portions 23 a of the respective insulating spacers 23, and the conductive spacers 2 contact the other end of the coil piece 22 and the other end of the coil piece 22.
Reference numeral 5 denotes a tip electrode provided in the discharge portion of the electrode in place of the coil piece 22. These electrodes 22 to 25 are integrated with an adhesive or a fastening jig to constitute the electrode 30.

In the lightning arrester configured as described above, similar to the first embodiment, when a high-voltage surge enters the power line, the lightning arrester operates and the surge arrester operating current flows to suppress the surge current. However, each coil piece 22,
A spiral electric path is formed through the conductive spacers 24 and the tip electrodes 25 fitted in the intermittent portions 23a of the insulating spacers 23, as shown by arrows in the figure. Since the generated magnetic field acts between the discharge gaps and drives and cools the arc in a spiral manner, it is possible to enhance the arc-extinguishing ability of the arc, that is, the follow current, and to obtain a large-capacity lightning arrester.

In FIG. 2, the tip electrode 25 is fixed as the discharge portion of the electrode. However, instead of these, the open end side of the coil piece 22 may be directly configured as the discharge portion. Furthermore, the coil piece 22, the insulating spacer 2
3. Although the cross-sectional shape of the conductive spacer 24 is shown as being square, it goes without saying that it may be polygonal or circular.

Embodiment 3 FIG. 3 is a side sectional view showing a configuration of an electrode portion of a lightning arrester according to Embodiment 3 of the present invention. In the figure, reference numerals 18 to 20 are the same as in the first embodiment, and a description thereof will be omitted. 26 is the first electrode 18
Is a first magnetic body that forms a rod-shaped magnetic path inserted into the center space of the second electrode 19; and 27 is a second magnetic body that forms a rod-shaped magnetic path inserted into the center space of the second electrode 19. .

In the lightning arrester configured as described above, when the lightning arrester operates, as in the first embodiment, both electrodes 1
The magnetic field generated in the coil-shaped central space due to the subsequent flow flowing through the electrodes 8 and 19 acts on the discharge gap, and the first magnetic body 26 and the second magnetic body 27
Since a magnetic path for enhancing the magnetic field is formed in the magnetic field 9, the magnetic field between the discharge gaps is strengthened, the driving force of the arc is increased, and the ability to block the downstream flow in the discharge gap can be increased. In the third embodiment, the first electrode 18 and the second electrode 19 are both formed in a coil shape and provided with the first and second magnetic bodies 26 and 27, respectively, but only one of the electrodes is used. May be formed in a coil shape, and a magnetic material may be provided on the coil.

Embodiment 4 FIG. 4 shows a configuration of an electrode discharge unit of a lightning arrester according to Embodiment 4 of the present invention.
(A) is a front view, (B) is a bottom view. In the figure,
Numeral 28 is a molding material such as an epoxy resin which generates an arc-extinguishing gas by heating, and has at least one through hole 28a.
And an insulating member fixed to the discharge portion 18a of the first electrode 18 as in FIG.

In the lightning arrester configured as described above, when the lightning arrester operates, the insulating member 28 is exposed to the arc between the discharge gaps. Since the arc is blown to the foot portion, the arc extinguishing ability of the downstream flow between the discharge gaps can be enhanced. Although the insulating member 28 is provided on the first electrode 18 in the fourth embodiment, the insulating member 28 may be provided on the second electrode 19 at the same time.

[0020]

As described above, according to the first aspect of the present invention, an insulator suspended and supported by one of the fixed support arms, and a power line support bracket provided at the bottom of the insulator and supporting the power line overhead. A lightning arrester main body formed and housed in a tubular insulating container with a lightning arrester element suspended from the other of the support arms, and a first end having one end fixed to the bottom of the lightning arrester main body and the other end serving as a discharge portion. In a lightning arrester including an electrode, one end of which is fixed to the power line support bracket and the other end of which is a discharge part, and a second electrode facing the first electrode via a discharge gap, at least one of the two electrodes is provided. Since the coil is formed in the shape of a coil, a lightning arrester with improved arc extinguishing capability and easy interruption of the downstream current can be obtained.

According to a second aspect of the present invention, there is provided an insulator suspended from one of the fixed support arms, a power line supporting bracket provided at the bottom of the insulator for supporting the power line overhead, and a tubular insulating member. A lightning arrester main body formed with a lightning arrester element housed in a container and suspended and supported by the other of the support arms; a first electrode having one end fixed to the bottom of the lightning arrester main body and the other end serving as a discharge portion; Is fixed to the power line support bracket, and the other end is a discharge portion. The lightning arrester includes the first electrode and a second electrode opposed via a discharge gap. At least one of the two electrodes has an intermittent portion. A current path is formed from one end to the other end in a ring shape having a plurality of coil pieces stacked with the intermittent portion shifted in the circumferential direction, and the intermittent portion formed in a ring shape having the intermittent portion is adjacent to the coil piece. One An insulating spacer inserted between the coil pieces so as to be located at positions corresponding to the other end side of the coil piece and one end side of the other adjacent coil piece, respectively, and is fitted into an intermittent portion of the insulating spacer. A lightning arrester that is constituted by a conductive spacer that is in contact with one end of the coil piece and the other end of the coil piece, so that the arc extinguishing ability can be increased, the continuation current can be cut off easily, and a large capacity can be accommodated. Is obtained.

According to a third aspect of the present invention, in the first or second aspect, the electrode is provided with a magnetic material in a space formed in the center portion, so that the magnetic field is further increased to extinguish the arc of the subsequent flow. And a lightning arrester that can easily block the following current can be obtained.

According to a fourth aspect of the present invention, there is provided the insulating member according to any one of the first to third aspects, wherein an arc-extinguishing gas is generated by heating in a discharge portion of the electrode and at least one through hole is provided. Therefore, an arc-extinguishing gas is sprayed on the following flow to improve the arc-extinguishing ability of the following flow, thereby obtaining a lightning arrester capable of easily blocking the following flow.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a lightning arrester according to Embodiment 1 of the present invention.

FIG. 2 is an exploded perspective view showing a configuration of an electrode of a lightning arrester according to Embodiment 2 of the present invention.

FIG. 3 is a side sectional view showing a configuration of an electrode part of a lightning arrester according to Embodiment 3 of the present invention.

4A and 4B show a configuration of an electrode tip of a lightning arrester according to Embodiment 4 of the present invention, wherein FIG. 4A is a front view and FIG. 4B is a bottom view.

FIG. 5 is a side view showing a configuration of a conventional lightning arrester.

FIG. 6 is a characteristic diagram illustrating a relationship between a transmission voltage and an arrester operating current when the arrester operates.

[Explanation of symbols]

Reference Signs List 11 support arm, 12 insulator, 13 power line support bracket, 14 power line, 15 lightning arrester main body, 16 insulating container, 17 lightning arrester, 18 first electrode, 18a, 19
a Discharge part, 19 second electrode, 22 coil piece, 22
a, 23a intermittent part, 23 insulating spacer, 24 conductive spacer, 26 first magnetic body, 27 second magnetic body,
28 insulating member, 28a through hole, 30 electrodes, G discharge gap, F magnetic field.

Claims (4)

[Claims] 1. An insulator suspended from one side of a fixed support arm, a power line support bracket provided on the bottom of the insulator to support a power line overhead, and a lightning arrester element formed in a tubular insulating container. A lightning arrester main body suspended from the other of the support arms, a first electrode having one end fixed to the bottom of the lightning arrester main body and the other end serving as a discharge portion, and one end fixed to the power line support bracket and the other end Becomes the discharge section and the first
A lightning arrester comprising: a first electrode and a second electrode opposed to the first electrode via a discharge gap, wherein at least one of the two electrodes is formed in a coil shape. 2. An insulator suspended from one side of a fixed support arm, a power line support bracket provided on a bottom portion of the insulator to support the power line overhead, and a lightning arrester element formed in a tubular insulating container. A lightning arrester main body suspended from the other of the support arms, a first electrode having one end fixed to the bottom of the lightning arrester main body and the other end serving as a discharge portion, and one end fixed to the power line support bracket and the other end Becomes the discharge section and the first
A lightning arrester provided with a first electrode and a second electrode facing each other via a discharge gap, wherein at least one of the two electrodes is formed in a ring shape having an intermittent portion, and a current path is formed from one end to the other end. A plurality of coil pieces stacked with the intermittent part shifted in the circumferential direction, and the other end side of one of the coil pieces adjacent to the intermittent part formed in a ring shape having the intermittent part and the other coil piece adjacent thereto An insulating spacer inserted between the coil pieces so as to be located at positions corresponding to one end of the coil piece, and one of the other end of the coil piece and the other of the coil piece inserted into the intermittent portion of the insulating spacer. And a conductive spacer that is in contact with one end of the lightning arrester. 3. The lightning arrester according to claim 1, wherein the electrode is provided with a magnetic material in a space formed at the center. 4. An insulating member having an arc-extinguishing gas generated by heating and having at least one through-hole is fixed to a discharge portion of the electrode. The lightning arrester described.