JPH1092242A - Arrester device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress snow on an arcing horn and surely catch flashover from a transmission and distribution wire when abnormal voltage caused by lightning surge arose. SOLUTION: In this arrester device, a plurality of suspension insulators 1, 3 are arranged on the same axis between a transmission and distribution wire 1 and an earth potential and connected so as to be capable of swing, an earthing side terminal 10 of an arrester 4 is fixed to the suspension insulator 3 to earth and connect, and an arcing horn 20 faced to the transmission and distribution wire 1 through an air gap is fixed to a charged side terminal 9 of the arrester 4, a charged side fixing fixture 17 is fixed to the suspension insulator 2 in the lower position, the tip of a supporting frame 19 extending from the fixing fixture 17 is electrically, mechanically connected and fixed to the charged side terminal 9 of the arrester 4, the straight arcing horn 20 extending from the fixing fixture 17 is arranged in parallel to the transmission and distribution wire 1, and the earthing side terminal 10 of the arrester 4 is connected to the suspension insulator 3 in the upper position with a flexible electric wire 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester, and more particularly to a lightning arrester provided on a transmission / distribution line for protecting peripheral equipment of the transmission / distribution line from lightning surge or the like when an abnormal voltage occurs due to a lightning surge or the like. The present invention relates to a lightning arrester attached to a suspension insulator.

[0002]

2. Description of the Related Art In general, when lightning strikes near insulators provided on high-voltage or extra-high power transmission and distribution lines, when an abnormal voltage is generated due to lightning surges, etc. For protection, a lightning arrester is installed between the ground side and the power receiving side of the insulator.

For example, as shown in FIG. 2, a lightning arrester 4 is attached to suspension insulators 2 and 3 provided on a transmission / distribution line 1 such as an electric overhead line. In the case shown in the figure, two suspension insulators 2 and 3 are arranged coaxially in the vertical direction to secure a withstand voltage between the transmission and distribution line 1 and the ground potential. Connection between the transmission / distribution line 1 on the side and the suspension insulator 2, between the suspension insulators 2 and 3, and between the suspension insulator 3 and the overhead wire support column (not shown) on the ground side, respectively. Parts 5, 6, and 7 are provided.

On the other hand, the surge arrester 4 is a current limiting device made of ZnO or the like having a non-linear current-voltage characteristic showing a low resistance to a surge voltage and a high resistance to a normal ground voltage of the transmission and distribution line 1. A device (not shown) has a structure in which the device is hermetically housed in an insulating jacket 8, and the upper and lower ends of the insulating jacket 8 are electrically connected to the current limiting element and the power-supply side and the ground. Side terminal 9,
10 is derived.

A ground terminal 10 of the lightning arrester 4 is connected to a suspension insulator 3 located above by a mounting bracket 11. Specifically, the mounting bracket 11 includes a C-shaped insulator holding portion 12 and a support frame 13 extending integrally from the insulator holding portion 12, and the insulator holding portion 12 is suspended by bolts and nuts 14, 15. The tip of the support frame 13 is electrically and mechanically connected and fixed to the ground terminal 10 of the arrester 4 by bolts.

A C-shaped ring-shaped arc horn 16 is attached to the power application side terminal 9 of the lightning arrester 4. That is, the base end of the arc horn 16 is electrically and mechanically connected and fixed to the power-supply-side terminal 9 of the lightning arrester 4 by bolting, and the ring-shaped tip of the arc horn 16 is attached to the suspension insulator located below. 2 are arranged in parallel with the transmission and distribution line 1 so as to surround the outer periphery of the transmission line 2.

In this lightning arrester, when an abnormal voltage is generated due to a lightning surge or the like, the flashover from the vicinity of the suspension insulator 2 of the transmission and distribution line 1 is captured by the arc horn 16, and the current limiting element of the lightning arrester 4 has a low resistance value. And let this escape to the ground instantly. This suppresses and interrupts the continuation flow to prevent disconnection or the like due to the continuation arc. On the other hand, when the abnormal voltage due to the lightning surge disappears, the current limiting element of the surge arrester 4 has a high resistance value and cuts off the normal ground voltage. By the valve action of the current limiting element of the lightning arrester 4, the peripheral equipment of the transmission and distribution line 1 is protected from lightning surge and the like.

[0008]

However, in the lightning arrester described above, the ground terminal 10 of the lightning arrester 4 is connected to the suspension insulator 3.
And the power supply side terminal 9 is in a free state. In particular, since the arc horn 16 provided at the power-supply-side terminal 9 of the lightning arrester 4 is formed in a ring shape so as to surround the outer periphery of the suspension insulator 2 above the transmission and distribution line 1, the arc horn 16 is caused by snow on the arc horn 16. May cause snow damage.

Further, the ring-shaped tip of the arc horn 16 is arranged so as to bypass the suspension insulator 2 on the transmission and distribution line 1, so that the linear distance from the transmission and distribution line 1 to the arc horn 16 is bypassed. In addition, the arc horn 16 is extended by the lightning arrester 4 so that
When the suspension insulator 2 is in a swinging state, the distance between the arc horn 16 and the transmission and distribution line 1 becomes unstable, and when an abnormal voltage is generated due to a lightning surge or the like,
Arc horn 1 for flashover from transmission and distribution line 1
6 makes it difficult to capture.

Accordingly, the present invention has been proposed in view of the above-mentioned problems, and an object of the present invention is to suppress snow accumulation on an arc horn and to reduce the occurrence of abnormal voltage due to lightning surge or the like. An object of the present invention is to provide a lightning arrester having a structure capable of reliably catching flashover from a vehicle with an arc horn.

[0011]

As a technical means for achieving the above object, the present invention provides a plurality of suspension insulators which are coaxially arranged between a power transmission and distribution line and a ground potential and are mutually swingable. And a current limiting element having a non-linear current-voltage characteristic is airtightly attached to a grounding terminal of the lightning arrester housed in the insulating casing by attaching to a grounding terminal of the lightning arrester. In a lightning arrester having a terminal and an arc horn opposed to a transmission / distribution line via an air gap, a power-supply-side mounting bracket is mounted on a suspension insulator directly swingably connected to the transmission / distribution line. The power-supply-side terminal of the lightning arrester is electrically and mechanically connected and fixed to the tip of a support frame extending from the metal fitting, and a straight arc horn extending from the mounting metal is arranged in parallel along a transmission and distribution line, Suspension insulators directly connected to transmission and distribution lines Characterized in that the ground-side terminal of the surge arrester to the other suspension insulator coupled and connected by flexible wires to.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The same parts as those in FIG. 2 are denoted by the same reference numerals.

The lightning arrester in the embodiment of FIG. 1 is applied to a transmission / distribution line 1 such as an electric wire as shown in FIG. 1, and is coaxially arranged in the vertical direction in order to ensure a withstand voltage between ground potentials. It has a structure in which a lightning arrester 4 is provided on two arranged suspension insulators 2 and 3, and in order to absorb the shaking of the transmission and distribution line 1, a suspension insulator is provided between the transmission and distribution line 1 and the suspension insulator 2 on the power supply side. Two, three
, The suspension insulator 3 and the overhead wire support [not shown]
Connecting portions 5, 6, which can swing about a pivot axis in each of the
7 is provided.

The lightning arrester 4 has the same structure as that of the prior art, and has a low resistance to a surge voltage and a high resistance to a normal ground voltage of the transmission and distribution line 1. It has a structure in which a current limiting element (not shown) made of ZnO or the like having characteristics is hermetically housed in an insulating jacket 8, and the upper and lower ends of the insulating jacket 8 are electrically connected to the current limiting element. And the power-supply-side and ground-side terminals 9 and 10 connected to the power supply side.

In this lightning arrester, a power-supply-side mounting bracket 17 is mounted on a suspension insulator 2 which is directly swingably connected to the power transmission and distribution line 1 and is located below. Specifically, this mounting bracket 17 is C
An insulator holding portion 18 having a V-shape, a support frame 19 integrally extending from the insulator holding portion 18, and a straight arc horn 20 extending from the insulator holding portion 18 in a direction opposite to the support frame 19 by 180 °. Consists of In addition, arc horn 20
Various types can be used as long as they are straight, such as rods and strips.

The mounting bracket 17 is fixed to the suspension insulator 2 by tightening the insulator holding portion 18 with bolts and nuts 21 and 22. Further, the power-supply-side terminal 9 of the lightning arrester 4 is electrically and mechanically connected and fixed to the tip of a support frame 19 extending from the insulator holding portion 18 by bolting. Further, the arc horn 20 extending from the insulator holding portion 18 is arranged in parallel along the power transmission and distribution line 1.

The ground terminal 10 of the lightning arrester 4 is connected to the suspension insulator 3 located above by a flexible electric wire 23. More specifically, one end of the flexible electric wire 23 is electrically and mechanically connected to and fixed to the ground terminal 10 of the lightning arrester 4 by bolting, and the flexible electric wire 23 is connected to the connecting portion 7 located above the suspension insulator 3. The ends are electrically and mechanically connected. The other end of the flexible electric wire 23 may be connected to the connecting portion 7 of the suspension 3 in a fixed state or may be connected in a rotatable state.

When the flexible electric wire 23 is drawn close to the suspension insulator 3 as shown in the figure, it is preferable to use an insulated wire. The flexible electric wire 23 can be routed in a position other than that shown in the figure. For example, the flexible electric wire 23 may be routed so as to detour upward or horizontally between the ground terminal 10 of the lightning arrester 4 and the suspension insulator 3.

In this lightning arrester, when an abnormal voltage is generated due to a lightning surge or the like, the flashover from the vicinity of the suspension insulator 2 of the transmission and distribution line 1 is captured by the arc horn 20, and the current limiting element of the lightning arrester 4 has a low resistance value. And let this escape to the ground instantly. This suppresses and interrupts the continuation flow to prevent disconnection or the like due to the continuation arc. On the other hand, when the abnormal voltage due to the lightning surge disappears, the current limiting element of the surge arrester 4 has a high resistance value and cuts off the normal ground voltage. By the valve action of the current limiting element of the lightning arrester 4, the peripheral equipment of the transmission and distribution line 1 is protected from lightning surge and the like.

In the lightning arrester of the present invention, the power-supply-side terminal 9 of the lightning arrester 4 is fixed to the suspension insulator 2 directly connected to the transmission and distribution line 1 via the support frame 19 of the mounting bracket 17, and the suspension insulator 2 Since the straight arc horns 20 extending from the mounting bracket 17 fixed to the power transmission and distribution line 1 are arranged in parallel along the power transmission and distribution line 1, the distances from the respective parts of the arc horn 20 to the transmission and distribution line 1 are all constant, and Even if the suspension insulator 2 is in a swinging state, the separation distance between the arc horn 20 and the transmission and distribution line 1 is stable. Even when flashing over from a location, it can be reliably captured.

The above-mentioned arc horn 20 is a straight one arranged in parallel along the transmission and distribution line 1, so that
Snow on the arc horn 20 is suppressed. Furthermore, even if the suspension insulator 3 located above swings, the lightning arrester 4 and the suspension insulator 3 are connected by the flexible electric wire 23 as described above. Absorbs the swing of the insulator 3.

[0022]

According to the present invention, the arc horn connected to the power-supply-side terminal of the surge arrester is fixed to the suspension insulator directly connected to the power transmission and distribution line. In any case, the distance between the arc horn and the transmission / distribution line is kept constant, so if an abnormal voltage occurs due to lightning surge, etc., even if the flashover from any part of the transmission / distribution line, Reliable and stable operation can be obtained due to the capture and simple structure.

Further, since the arc horn is a straight one arranged in parallel along the power transmission and distribution line, snow accumulation on the arc horn can be suppressed and snow damage can be prevented. Furthermore,
By connecting the grounding terminal of the arrester and the suspension insulator with a flexible wire, even if the suspension insulator is in a swinging state,
The deformation of the flexible electric wire can absorb the swing of the suspension insulator.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a lightning arrester according to the present invention.

FIG. 2 is a front view showing a conventional example of a lightning arrester.

[Description of Signs] 1 Transmission / distribution line 2 Suspension insulator 3 Suspension insulator 4 Lightning arrester 8 Insulation jacket 9 Power receiving side terminal 10 Ground side terminal 17 Power receiving side mounting bracket 19 Support frame 20 Arc horn 23 Flexible electric wire

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02G 13/00 H02G 13/00 D (72) Inventor Hidenori Mochizuki 4-9-1 Nihonbashi Honcho, Chuo-ku, Tokyo Otowa Electric Industrial Co., Ltd. Company Tokyo Branch

Claims (1)

[Claims] A plurality of suspension insulators are coaxially arranged between a transmission / distribution line and a ground potential and connected to each other so as to be swingable, so that a current limiting element having a non-linear current-voltage characteristic is hermetically sealed. Attach the ground terminal of the lightning arrester housed in the insulating jacket to the suspension insulator and connect it to the ground, and to the power receiving side terminal of the lightning arrester,
In a lightning arrester equipped with an arc horn facing a transmission / distribution line via an air gap, a power application side mounting bracket is mounted on a suspension insulator directly swingably connected to the transmission / distribution line, and extends from the mounting bracket. The power-supply-side terminal of the lightning arrester is electrically and mechanically connected and fixed to the end of the support frame, and a straight arc horn extending from the mounting bracket is arranged in parallel along the power transmission and distribution line. A lightning arrester characterized in that a ground side terminal of the lightning arrester is connected by a flexible wire to another suspension insulator connected to a suspension insulator directly connected to the lightning arrester.