JP2003100418A - Gap adjusting gauge and mounting method of lightning protection device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a lightning protection device to be installed at an insulator so that a prescribed gap length can be obtained by a simple and easy means even at a mounting site or the like. SOLUTION: The lightning protection device 4 equipped with a current limiting element having non-linear current-voltage characteristics is installed via a mounting fitting 12 at a ground side site of the insulator to support a power transmission electric wire 1. When an element side electrode 8 of the lightning protection device 4 is opposingly installed at an electric wire side electrode installed at the power transmission electric wire 1 via a discharging gap 11, by mounting the base end part of a removable gap adjusting gauge 13 on the element side electrode 8 of the lightning protection device 4 and by positioning the tip end part of the gap adjusting gauge 13 against the electric wire side electrode, the lightning protection device 4 is positioned in such a state that a gap length G of the discharging gap 11 is regulated, and after that, the gap adjusting gauge 13 is pulled out and removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gap adjusting gauge and a method of mounting a lightning arrester using the same, and more specifically, protects peripheral equipment of a power transmission and distribution line from lightning surge or the like when abnormal voltage occurs due to lightning surge or the like. The present invention relates to a mounting method for attaching a lightning arrester to a porcelain insulator with the gap length regulated by a gap adjusting gauge.

[0002]

2. Description of the Related Art Generally, when lightning strikes near an insulator that supports high-voltage or extra-high-voltage transmission / distribution wires (insulation-covered wires), or when abnormal voltage due to lightning surge occurs, peripheral equipment including the insulator is thundered. A lightning arrester is installed between the grounding side of the insulator and the power transmission / distribution line to protect it from surges. This lightning arrester shuts off the follow-up current after a lightning stroke to suppress the lightning surge overvoltage.

The lightning arrester 4 has a current limiting element such as ZnO having a non-linear current-voltage characteristic that exhibits low resistance to surge voltage and high resistance to normal ground voltage of transmission and distribution lines. (Not shown) is built in and is attached to the insulator 2 which supports the power transmission and distribution line 1 as shown in FIG. The insulator 2 that supports the power transmission / distribution line 1 is attached to the armrest 9 of the electric pole by bolting or the like, and the lightning arrester 4 is attached to the grounding side portion under the insulator 2 via the attachment fitting 3. . Further, the upper portion of the insulator 2 is bound to the power transmission / distribution line 1 by a bind wire 5.

In this lightning protection device 4, the current limiting element is covered with an insulating jacket 6 and the grounding side electrode 7 and the voltage applying side electrode 8 electrically connected to the current limiting element are covered with the insulating jacket. The body 6 has a structure derived from the upper and lower sides, and the ground side electrode 7 is fixed to the tip of a mounting member 3 extending from the ground side portion of the insulator 2 by screwing or the like, and is mounted in a standing state.

On the other hand, an electric wire side electrode (not shown) is provided in the vicinity of the supporting portion of the power transmission and distribution wire 1 by the insulator 2 and breaks through the insulating coating portion of the power transmission and distribution wire 1 and is electrically connected to the core wire. There is. This wire-side electrode has a structure housed in an insulating cover 10, and the wire-side electrode is arranged at an upper end portion of a discharge hole formed in a lower portion of the insulating cover 10, and the wire-side electrode is provided through the discharge hole. The charge-side electrode 8 of the lightning arrester 4 is arranged so as to face the electrode. A discharge gap having a predetermined gap length between the charge-side electrode 8 (hereinafter, referred to as an element-side electrode) of the lightning arrester 4 and the wire-side electrode of the transmission / distribution line 1 via the air gap and the discharge hole. 11 is formed.

When an overvoltage due to a lightning surge or the like is applied to the transmission / distribution line 1, flashover occurs from the line-side electrode provided on the transmission / distribution line 1, and the element-side electrode 8 of the lightning arrester 4 is passed through the discharge gap 11. Captured by. The lightning arrester 4
Then, the current limiting element has a low resistance value due to an overvoltage due to a lightning surge or the like, and this is released to the ground through the ground electrode 7, the mounting bracket 3 and the arm 9 and the follow current associated therewith is cut off. Therefore, disconnection due to the follow-up arc is prevented. If the overvoltage caused by the lightning surge disappears,
The current limiting element has a high resistance value and shuts off the normal ground voltage. Due to the valve action of the lightning protection device 4, peripheral equipment including the insulator 2 is protected from a lightning surge or the like.

[0007]

In the mounting structure of the lightning arrester 4 described above, the element side electrode 8 of the lightning arrester 4 is used as one discharge electrode, and the wire side electrode of the transmission and distribution line 1 is used as the other discharge. A discharge gap 11 having a predetermined gap length is formed between the discharge electrodes as an electrode. Since the discharge voltage of the discharge gap 11 varies depending on the size of the gap length, the peripheral equipment including the insulator 2 should be protected. In order to cooperate with the dielectric strength of the peripheral equipment, the above-mentioned lightning surge It is necessary to make the gap length as small as possible so as to quickly operate against an overvoltage caused by, for example, and suppress an overvoltage caused by a lightning surge or the like.

On the other hand, the lightning arrester 4 is attached to the ground side portion of the insulator 2 attached to the armrest 9 of the electric pole via the attachment metal fitting 3. The fitting 3 is preliminarily selected to have a size and shape suitable for mounting the lightning arrester 4 on the insulator 2 so that a predetermined gap length can be obtained from various conditions such as the sizes of the insulator 2 and the lightning arrester 4. Workers attach the lightning arrester 4 to the insulator 2 locally by using the fittings 3.

However, when the worker actually mounts the lightning arrester 4 on the insulator 2, the discharge gap 11 may not have a predetermined gap length due to the dimensional tolerances of the insulator 2 and the lightning arrester 4. In the present situation, the lightning arrester 4 cannot obtain a desired discharge characteristic.
In particular, if the gap length becomes small as described above, it becomes very difficult to adjust the gap length.

There is also a unit structure in which a lightning arrester in which a discharge gap is integrated is mounted on the insulator itself which supports the transmission and distribution lines. That is, the arc horn is led out from one end of the insulator and the lightning arrester is attached to the other end to form a discharge gap having a predetermined gap length between the arc horn and the lightning arrester. However, in the case of such a unit structure, there is a problem that only the lightning arrester cannot be attached to the existing insulator.

Therefore, the present invention has been proposed in view of the above problems, and an object thereof is to provide a lightning arrester with a lightning arrester so that a predetermined gap length can be obtained by a simple means even at an installation site or the like. It is to be able to attach to.

[0012]

As a technical means for achieving the above object, a gap adjusting gauge according to the present invention is a lightning protection device attached to a ground side portion of an insulator supporting an electric wire via a mounting metal fitting. Is detachably attached to the element-side electrode, and the gap length of the discharge gap formed between the element-side electrode of the lightning arrester and the wire-side electrode provided on the wire is regulated.

Even if the gap length in the discharge gap is small, it is possible to easily set the gap length to a predetermined specified value only by mounting the gap adjusting gauge on the element side electrode of the lightning arrester. After the adjustment of the gap length, the gap adjusting gauge is detachable, so the gap adjusting gauge may be removed from the element-side electrode.

The gap adjusting gauge is detachably fitted to the element side electrode of the lightning arrester so as to hold the element side electrode, and is an insulating tube having a predetermined length for regulating the gap length. It has a structure in which an opening is formed in a part of the side wall portion of the element-shaped member, the opening being formed so as to be detached from the element-side electrode and can be pulled out to the side. here,
The predetermined length that regulates the gap length means that the base end of the tubular member is attached to the element-side electrode and its tip is aligned with the wire-side electrode, and the tip of the element-side electrode and the tube It means that the distance from the tip of the strip-shaped member is set to be the gap length.

With such a structure, the gap length is set to a predetermined specified value simply by aligning the tip of the gap adjusting gauge with the wire-side electrode while the gap-adjusting gauge is attached to the element-side electrode of the lightning arrester. Can be set. Further, after adjusting the gap length, the gap adjusting gauge can be easily removed by pulling out the gap adjusting gauge laterally using the opening of the tubular member. If a strap for laterally pulling out the tubular member is attached to the side wall of the tubular member opposite to the opening, the gap adjusting gauge can be removed more easily.

In the method of the present invention using this gap adjusting gauge, a lightning arrester is attached to a ground side portion of an insulator supporting an electric wire via a mounting metal fitting, and an element side electrode of the lightning arrester is provided on the electric wire. When arranging the wire side electrode opposite to the wire side electrode via the discharge gap, the base end of the removable gap adjusting gauge is attached to the element side electrode of the lightning arrester, and the tip of the gap adjusting gauge is attached to the wire side electrode. The lightning arrester is positioned in a state in which the gap length of the discharge gap is regulated by aligning the discharge gap, and then the gap adjusting gauge is pulled out and removed.

In the method of the present invention, the gap adjusting gauge is attached in advance to the element side electrode of the lightning arrester mounted on the insulator through the attaching metal fitting, and the attaching metal fitting is slid to move the tip of the gap adjusting gauge to the electric wire side. Align with the electrode. As a result, the gap length between the element side electrode of the lightning arrester and the wire side electrode of the transmission and distribution line can be set to a specified value, and then the gap adjustment gauge can be pulled out and removed to install the lightning arrester. Is completed. By using this gap adjustment gauge, there is no need to adjust the gap length due to the dimensional tolerance of the insulator, etc., and even at the installation site, etc., attach a lightning arrester to the insulator so that it has the desired discharge characteristics by a simple means. Can be realized.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. The same parts as those in FIG. 8 are designated by the same reference numerals.

FIG. 1 illustrates a state in which, in the embodiment of the present invention, a lightning arrester 4 is attached to an insulator 2 that supports a high-voltage or extra-high-voltage transmission / distribution wire 1 (insulation-coated wire). Transmission and distribution line 1
The insulator 2 which supports the lightning protection device 4 is attached to the armor 9 of the electric pole by bolting or the like, and the lightning arrester 4 is attached to the ground side portion 7 at the lower part of the insulator 2 via the attachment fitting 12. Further, the upper portion of the insulator 2 is bound to the power transmission / distribution line 1 by a bind wire 5. As shown in FIG. 2, a wire-side electrode 19 is provided near the supporting portion of the power transmission / distribution wire 1 by the insulator 2, and the wire-side electrode 19 pierces through the insulating coating portion 17 of the power distribution wire 1 and is electrically connected to the core wire 18. . The electric wire side electrode 19 has a structure housed in the insulating cover 10, and an insulating member 20 is fitted under the electric wire side electrode 19 to form a discharge hole 21 in the insulating member 20. The lower end of the discharge hole 21 is opened in the air gap with the element-side electrode 8, and the electric wire-side electrode 19 is exposed and arranged in the inner portion of the upper end thereof (see FIG. 3).

The lightning protection device 4 is a current limiting element such as ZnO having a non-linear current-voltage characteristic that exhibits low resistance to surge voltage and high resistance to normal ground voltage of transmission and distribution lines. The grounding side electrode 7 and the element side electrode 8 which are covered with the insulating jacket 6 and are electrically connected to the current limiting element are provided from above and below the insulating jacket 6, and the grounding side thereof is provided. A mounting bracket 12 that extends the electrode 7 from the grounded side portion of the insulator 2.
It is attached to the tip of the by means of screws, etc., and is attached while standing upright.

The element side electrode 8 of the lightning arrester 4 is provided with the insulating cover 1 through the discharge hole 21 formed in the insulating member 20.
It is arranged so as to face the electric wire side electrode 19 housed in 0. Between the element side electrode 8 and the wire side electrode 19 of the lightning protection device 4, the upper end portion of the element side electrode 8 and the insulating member 2 are provided.
The length g of the air gap between the lower end of the wire 0 and the lower end of the wire member 0 and the length g ′ from the lower end of the insulating member 20 to the lower end of the wire-side electrode 19 via the discharge hole 21 are added. Gap length G
Is formed.

When an overvoltage due to a lightning surge or the like is applied to the transmission and distribution line 1 at the time of a lightning strike near the insulator 2, the wire side electrode 19 provided on the transmission and distribution line 1 flashes over and the discharge gap 11 It is captured by the element-side electrode 8 of the lightning arrester 4 via. In the lightning arrester 4, the current limiting element has a low resistance value due to an overvoltage due to a lightning surge or the like, and this is released to the ground via the ground side electrode 7, the mounting metal fitting 12 and the arm 9 and a follow-up current accompanying it is generated. Since it is suppressed and cut off, disconnection due to a follow-up arc is prevented. When the overvoltage due to the lightning surge or the like disappears, the current limiting element has a high resistance value and interrupts a normal ground voltage. This valve action protects the peripheral equipment including the insulator 2 from lightning surges and the like.

Here, since the discharge voltage of the discharge gap 11 formed between the element side electrode 8 of the lightning arrester 4 and the wire side electrode 19 of the power transmission and distribution line 1 varies depending on the size of the gap length G, the insulator In order to protect the peripheral equipment including 2 and to cooperate with the dielectric strength of the peripheral equipment, it is possible to quickly operate against the overvoltage due to the above-mentioned lightning surge or the like and suppress the overvoltage due to the lightning surge or the like. So the gap length G
Needs to be as small as possible.

Therefore, even when the gap length G is small,
The gap adjusting gauge 13 is used so that the gap length G can be easily set to a prescribed value. The gap adjusting gauge 13 is detachably attached to the element side electrode 8 of the lightning protection device 4 as shown by the broken line in FIG. 1, and is connected to the element side electrode 8 of the lightning protection device 4 and the wire side electrode 19 of the transmission and distribution line 1. The gap length G of the discharge gap 11 formed between the two is regulated.

The gap adjusting gauge 13 has a structure as shown in FIGS. 4 and 5 (a)-(c), for example. The gap adjusting gauge 13 is composed of an insulating resin cylindrical member 14 detachably fitted to the element side electrode 8 of the lightning arrester 4 so as to hold the element side electrode 8.
An opening 15 is formed in a part of the side wall of the lightning protection device 4 so that the opening 15 can be detached from the element-side electrode 8 of the lightning protection device 4 and can be extracted laterally. A strap 16 is attached to the side wall of the cylindrical member 14, and after adjusting the gap, the strap 16 is pulled laterally to open the gap adjusting gauge 1 from the opening 15 of the side wall.
3 has a structure that can be removed.

A cylinder that abuts the tip of the element-side electrode 8 and the lower end of the insulating member 20 of the insulating cover 10 when the base end of the gap adjusting gauge 13 is attached to the element-side electrode 8 of the lightning arrester 4. The length dimension of the cylindrical member 14 is defined so that the distance from the tip of the cylindrical member 14 becomes the length g of the air gap. If the length dimension of the cylindrical member 14 is regulated to a predetermined value from the length g of the air gap,
Since the length g'of the discharge hole 21 is defined in advance between the lower end of the insulating member 20 and the lower end of the wire-side electrode 19, the length g'of the discharge hole 21 is added to the length g of the air gap. A predetermined gap length G is added.

The procedure for attaching the lightning arrester 4 to the insulator 2 using the gap adjusting gauge 13 is as follows. First, the base end of the gap adjusting gauge 13 is attached to the element side electrode 8 of the lightning arrester 4 in advance. As shown in FIG. 6, the gap adjusting gauge 13 is fitted so as to hold the element side electrode 8 of the lightning arrester 4, and is set in a state of being placed on the element side electrode 8. After setting the gap adjustment gauge 13, the mounting bracket 12
Slide to adjust the position of the lightning arrester 4. The mounting bracket 12 has a structure that is slidable in the vertical direction (the direction of arrow s in FIG. 1), and by using a long hole formed in a part of the mounting bracket 12 along the vertical direction, the lightning arrester 4 Adjust the vertical position. By this position adjustment, the tip of the gap adjusting gauge 13 attached to the element-side electrode 8 of the lightning arrester 4 is brought into contact with the lower end of the insulating member 20 provided below the insulating cover 10 of the power transmission and distribution line 1.

As described above, by merely bringing the tip end portion of the gap adjusting gauge 13 into contact with the lower end portion of the insulating member 20, the air gap between the element side electrode 8 of the lightning arrester 4 and the lower end portion of the insulating member 20 is reduced. The length g is defined as a predetermined value. If the length g of the air gap is set to a predetermined value, the length g ′ of the discharge hole 21 between the lower end of the insulating member 20 and the wire-side electrode 19 is set in advance. A predetermined gap length G between the element-side electrode 8 of the lightning arrester 4 and the wire-side electrode 19 of the power transmission / distribution line 1 is defined as the sum of the air gap length g and the discharge hole 21 length g ′. Can be set to a value.

Thereafter, as shown in FIG. 7, by pulling the strap 16 of the gap adjusting gauge 13 laterally, the gap adjusting gauge 13 can be detached from the element side electrode 8 through the opening portion 15. The installation of the lightning arrester 4 is completed with the gap adjusting gauge 13 setting the gap length G to a predetermined specified value.

The lightning protection device 4 is attached to the insulator 2, the position of the lightning protection device 4 is adjusted by the fitting 12, and the gap adjusting gauge 13 is removed by the indirect live wire construction method. This indirect live-wire construction method uses a long insulated operating rod (indirect live-wire tool) for distribution line high-voltage live-line work so that workers can perform predetermined work without directly touching the live line. It is a construction method that can By using this indirect live wire construction method, it is not necessary to protect the live parts, etc., so the working time can be shortened, and since work can be done away from the live wire, there is no risk of electric shock. The working environment can be secured, and the fatigue of the worker can be reduced by eliminating the need for protective equipment and protective equipment.

[0031]

According to the present invention, when a lightning arrester is attached to an insulator with its element-side electrode facing the wire-side electrode of the transmission and distribution line via a discharge gap, the element-side of the lightning arrester is provided. By using a gap adjusting gauge that is detachably attached to the electrode and regulates the gap length of the discharge gap, even if the gap length in the discharge gap is small, the adjustment work of the gap length can be easily performed, and Since the work of adjusting the gap length due to the dimensional tolerance of the insulator and the like becomes unnecessary, a lightning arrester having a desired discharge characteristic can be attached to the insulator by a simple means even at the installation site and the like, and workability is greatly improved.

Further, since the gap length can be adjusted with certainty, the reliability of the protection performance of the lightning protection device is greatly improved, and the performance of protecting the peripheral equipment including the insulator by the lightning protection device is also greatly improved. It is possible to prevent accidents due to contact, etc. and improve safety.

[Brief description of drawings]

FIG. 1 is a front view for explaining an embodiment of the present invention, showing a state in which a gap adjusting gauge is attached to a lightning arrester attached to an insulator.

FIG. 2 is a view taken in the direction of arrow X in FIG. 1 including a partial cross-sectional portion for explaining the positional relationship between the wire-side electrode in the insulating cover of the transmission and distribution wire and the element-side electrode of the lightning arrester in the embodiment of the invention It is a figure.

FIG. 3 is a front view including a partial cross-sectional portion showing an electric wire side electrode and an insulating member of FIG.

FIG. 4 is a perspective view showing a gap adjusting gauge used in the present invention.

FIG. 5 (a) is a front view showing a gap adjusting gauge,
(B) is sectional drawing which follows the AA line of (a), (c) is a rear view of (a).

FIG. 6 is an enlarged partial sectional view of an essential part showing a state in which a gap adjusting gauge is attached to an element side electrode of a lightning arrester.

FIG. 7 is an enlarged partial sectional view of an essential part showing a state in which the gap adjusting gauge is removed from the element side electrode of the lightning arrester.

FIG. 8 is a front view for explaining a conventional example, showing a state in which a lightning arrester is attached to an insulator.

[Explanation of symbols]

1 transmission and distribution lines 2 insulator 4 Lightning arrester 7 Ground electrode 8 element side electrode 11 discharge gap 12 Mounting bracket 13 Gap adjustment gauge 14 Cylindrical member 15 openings 19 Wire side electrode G gap length

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tomoaki Ako             Otowa, 3-7-18 Meishin Town, Amagasaki City, Hyogo Prefecture             Denki Kogyo Co., Ltd. Head Office F term (reference) 5G331 AA04 AA06 BB33 BC11 DA03                       EA16 EB07

Claims (4)

[Claims] 1. An element-side electrode of a lightning arrester attached to a grounding side portion of an insulator supporting an electric wire via a mounting metal fitting, and detachably attached to the element-side electrode of the lightning arrester and the electric wire. A gap adjusting gauge which regulates a gap length of a discharge gap formed between the wire side electrode and the wire side electrode. 2. An insulating cylindrical member that is detachably fitted to the element-side electrode of the lightning arrester so as to hold the element-side electrode and has a predetermined length that regulates the gap length. The gap adjusting gauge according to claim 1, wherein an opening is formed in a part of the side wall of the opening so that the opening can be separated from the element-side electrode and can be pulled out laterally. 3. The gap adjusting gauge according to claim 2, wherein a strap for pulling out the tubular member laterally is attached to a portion of the side wall portion of the tubular member opposite to the opening portion. 4. A lightning arrester is attached to a ground side portion of an insulator supporting an electric wire via a mounting metal fitting, and an element side electrode of the lightning arrester is connected to an electric wire side electrode provided on the electric wire via a discharge gap. When facing each other, the base end of the removable gap adjusting gauge is attached to the element side electrode of the lightning arrester, and the tip end of the gap adjusting gauge is aligned with the wire side electrode so that the discharge gap A method for mounting a lightning arrester, characterized in that the lightning arrester is positioned with the gap length being regulated, and then the gap adjusting gauge is pulled out and removed.