JP4657535B2 - Gap adjustment gauge and lightning arrester mounting method using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gap adjustment gauge and a method for mounting a lightning arrester using the same, and more specifically, a lightning arrester for protecting peripheral equipment of transmission and distribution lines from lightning surges, etc. when an abnormal voltage is generated due to lightning surges, etc. The present invention relates to an attachment method for attaching to an insulator in a state where a gap length is regulated by a gap adjustment gauge.
[0002]
[Prior art]
In general, when lightning strikes near the insulator that supports high-voltage or extra-high-voltage transmission / distribution cables (insulation-coated electric wires), when abnormal voltage occurs due to lightning surges, the peripheral equipment including the insulators is protected from lightning surges, etc. For this reason, a lightning arrester is attached between the grounding side of the insulator and the transmission / distribution line. This lightning arrester cuts off the wake after the lightning strike and suppresses lightning surge overvoltage.
[0003]
The lightning arrester 4 is a current limiting element (not shown) 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. ) And is attached to the insulator 2 that supports the power transmission and distribution line 1 as shown in FIG. The insulator 2 supporting the power transmission / distribution line 1 is attached to the armature 9 of the power pole by bolting or the like, and the lightning arrester 4 is attached to the ground side part under the insulator 2 via the attachment fitting 3. . Further, the upper portion of the insulator 2 is bound to the transmission / distribution electric wire 1 by a bind wire 5.
[0004]
In the lightning arrester 4, the current limiting element is covered with an insulating envelope 6, and the grounding side electrode 7 and the power application side electrode 8 electrically connected to the current limiting element are connected to the insulating casing 6. It has a structure derived from above and below, and the ground side electrode 7 is attached to the tip of the mounting bracket 3 extending from the ground side portion of the insulator 2 by screwing or the like, and is attached in a standing state.
[0005]
On the other hand, an electric wire side electrode (not shown) that penetrates the insulating coating portion of the transmission / distribution line 1 and is electrically connected to the core wire is provided in the vicinity of the supporting portion of the transmission / distribution line 1 by the insulator 2. The electric wire side electrode has a structure housed in the insulating cover 10, and the electric wire side electrode is disposed at the upper end portion of the discharge hole formed in the lower portion of the insulating cover 10, and the electric wire side electrode is disposed through the discharge hole. The power application side electrode 8 of the lightning arrester 4 is disposed so as to face the electrode. A discharge gap having a predetermined gap length between an electricity application side electrode 8 (hereinafter referred to as an element side electrode) of the lightning arrester 4 and a wire side electrode of the transmission and distribution line 1 through an air gap and a discharge hole. 11 is formed.
[0006]
When an overvoltage due to a lightning surge or the like is applied to the transmission / distribution line 1, it flashes over from the wire-side electrode provided on the transmission / distribution line 1 and is captured by the element-side electrode 8 of the lightning arrester 4 through the discharge gap 11. The In the lightning arrester 4, the current limiting element has a low resistance value due to an overvoltage caused by a lightning surge or the like, and this is released to the ground via the ground side electrode 7, the mounting bracket 3, and the brace 9, and the accompanying current is generated. Since it is suppressed and cut off, disconnection due to a continuation arc is prevented. When the overvoltage due to the lightning surge disappears, the current limiting element has a high resistance value and cuts off the normal ground voltage. By the valve action of the lightning arrester 4, peripheral equipment including the insulator 2 is protected from lightning surges and the like.
[0007]
[Problems to be solved by the invention]
By the way, in the attachment structure of the lightning arrester 4 mentioned above, the element side electrode 8 of the lightning arrester 4 is used as one discharge electrode, and the wire side electrode of the power transmission and distribution line 1 is used as the other discharge electrode. A discharge gap 11 having a gap length of 1 mm is formed. Since the discharge voltage of the discharge gap 11 varies depending on the gap length, in order to protect the peripheral equipment including the insulator 2, in order to coordinate with the dielectric strength of the peripheral equipment, the lightning surge described above is used. Therefore, it is necessary to make the gap length as small as possible so that the overvoltage due to lightning surge or the like can be suppressed by operating quickly with respect to the overvoltage due to lightning.
[0008]
On the other hand, the lightning arrester 4 is attached to the grounding side portion of the insulator 2 attached to the arm 9 of the utility pole via the attachment fitting 3. The fitting 3 is selected in advance from dimensions such as the size of the insulator 2 and the lightning arrester 4 so as to fit the attachment of the lightning arrester 4 to the insulator 2 so as to obtain a predetermined gap length. Using the mounting bracket 3, a worker attaches the lightning arrester 4 to the insulator 2 locally.
[0009]
However, when the worker actually attaches the lightning arrester 4 to the insulator 2 at the site, the discharge gap 11 may not have a predetermined gap length due to the dimensional tolerance of the insulator 2 or the lightning arrester 4. The present situation is that a desired discharge characteristic cannot be obtained in the device 4. In particular, as described above, when the gap length is reduced, adjustment work for obtaining a predetermined gap length becomes very difficult.
[0010]
In addition, there is a unit structure in which a lightning arrester integrated with a discharge gap is mounted on the insulator itself supporting the transmission / distribution line. That is, an arc horn is led out from one end of the insulator and a lightning arrester is attached to the other end, and a discharge gap having a predetermined gap length is formed 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.
[0011]
Therefore, the present invention has been proposed in view of the above problems, and the object of the present invention is to provide a lightning arrester to the insulator so that a predetermined gap length can be obtained by simple means even at the installation site. There is in doing so.
[0012]
[Means for Solving the Problems]
As technical means for achieving the above object, a gap adjustment gauge according to the present invention, the element-side electrode on the element side electrode of the arrester system mounted through the mounting bracket to the ground portion of the insulator which supports the wire the detachably fitted to embrace, a predetermined length for regulating the gap length of the discharge gap formed between the wire-side electrode provided on the wire and the element-side electrodes of the lightning arrester It is characterized by comprising an insulating cylindrical member having an opening formed in a part of the side wall portion, which is separated from the element side electrode and can be pulled out sideways . Here, the predetermined length for regulating the gap length means that the base end portion of the cylindrical member is attached to the element side electrode and the tip end portion is aligned with the wire side electrode, and the element side electrode It means that the separation distance between the tip and the tip of the cylindrical member is set to be the gap length.
[0013]
Even if the gap length in the discharge gap is small, the gap length can be easily set to a predetermined specified value by simply mounting the gap adjustment gauge on the element side electrode of the lightning arrester. After the adjustment of the gap length, the gap adjustment gauge is detachable. Therefore, the gap adjustment gauge may be removed from the element side electrode.
[0015]
With such a structure, the gap length is set to a predetermined specified value simply by aligning the tip of the gap adjustment gauge with the wire side electrode while the gap adjustment gauge is attached to the element side electrode of the lightning arrester. Can do. Further, after the gap length is adjusted, the gap adjustment gauge can be easily removed by pulling it out sideways using the opening of the cylindrical member. In addition, if the strap for pulling out the cylindrical member to the side is attached to the part opposite to the opening of the side wall of the cylindrical member, the gap adjustment gauge can be further easily removed.
[0016]
In the method of the present invention using this gap adjustment gauge, a lightning arrester is attached to the grounding side portion of the insulator supporting the electric wire via a mounting bracket, and the element side electrode of the lightning arrester is connected to the electric wire side provided on the electric wire. When the electrode is opposed to the electrode via the discharge gap, the base end portion of the gap adjustment gauge made of an insulating cylindrical member having a predetermined length for regulating the gap length of the discharge gap is connected to the element side of the lightning arrester. the element-side electrode to the electrode fitted to embrace, position the lightning arrester while regulating the gap length of the discharge gap by aligning the distal end portion of the gap adjustment gauge against the wire-side electrode and, thereafter, to withdrawal is removed to the tubular member to the gap adjustment gauge through an opening formed in a part of the side wall portion is detached from the element-side electrode side of the And features.
[0017]
In the method of the present invention, a gap adjustment gauge is attached in advance to the element side electrode of the lightning arrester attached to the insulator via the attachment fitting, and the attachment fitting is slid so that the tip of the gap adjustment gauge is in contact with the wire side electrode. Align. 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 predetermined specified value, and then the lightning device can be attached by pulling out and removing the gap adjustment gauge. Is completed. By using this gap adjustment gauge, it is not necessary to adjust the gap length due to the dimensional tolerance of the insulator, etc., and even at the installation site, a lightning arrester is attached to the insulator so that it has the desired discharge characteristics by simple means. Can be realized.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention are described in detail below. The same parts as those in FIG. 8 are denoted by the same reference numerals.
[0019]
FIG. 1 illustrates a state in which a lightning arrester 4 is attached to an insulator 2 that supports a high-voltage or extra-high-voltage transmission / distribution cable 1 (insulation-coated cable) in an embodiment of the present invention. The insulator 2 supporting the power transmission / distribution line 1 is attached to the armature 9 of the power pole by bolting or the like, and the lightning arrester 4 is attached to the grounding side portion 7 below the insulator 2 via the attachment fitting 12. . Further, the upper portion of the insulator 2 is bound to the transmission / distribution electric wire 1 by a bind wire 5. In the vicinity of the support portion of the transmission / distribution line 1 by the insulator 2, as shown in FIG. 2, a wire-side electrode 19 is provided which penetrates the insulating coating portion 17 of the transmission / distribution line 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 to the lower portion of the electric wire side electrode 19, and a discharge hole 21 is formed in the insulating member 20. The lower end portion of the discharge hole 21 opens in the air gap with the element side electrode 8, and the wire side electrode 19 is exposed and disposed at the upper end deep portion (see FIG. 3).
[0020]
The lightning arrester 4 has an insulation sheath for 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. A structure in which a ground side electrode 7 and an element side electrode 8 which are covered with a body 6 and are electrically connected to the current limiting element are led out from above and below the insulating covering body 6. They are attached in a state where they are fixed and fixed up by screwing or the like to the tip of the mounting bracket 12 extending from the grounding side portion of the insulator 2.
[0021]
The element side electrode 8 of the lightning arrester 4 is disposed so as to face the electric wire side electrode 19 accommodated in the insulating cover 10 through a discharge hole 21 formed in the insulating member 20. Between the element side electrode 8 and the wire side electrode 19 of the lightning arrester 4, the length g of the air gap between the upper end portion of the element side electrode 8 and the lower end portion of the insulating member 20, and the insulating member 20. A discharge gap 11 having a predetermined gap length G is formed by adding a length g ′ reaching the lower end portion of the electric wire side electrode 19 from the lower end portion thereof via the discharge hole 21.
[0022]
When an overvoltage due to a lightning surge or the like is applied to the transmission / distribution line 1 during a lightning strike in the vicinity of the insulator 2, it flashes over from the wire side electrode 19 provided on the transmission / distribution line 1 and passes through the discharge gap 11. It is captured by the element side electrode 8 of the lightning arrester 4. In the lightning arrester 4, the current limiting element has a low resistance value due to an overvoltage caused by a lightning surge or the like, and this is released to the ground via the ground side electrode 7, the mounting bracket 12, and the brace 9, and the accompanying current is generated. Since it is suppressed and cut off, disconnection due to a continuation arc is prevented. When the overvoltage due to the lightning surge disappears, the current limiting element has a high resistance value and cuts off the normal ground voltage. This valve action protects peripheral equipment including the insulator 2 from lightning surges and the like.
[0023]
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 transmission and distribution line 1 varies depending on the gap length G, the insulator 2 is included. In order to coordinate with the dielectric strength of the peripheral equipment in terms of protecting the peripheral equipment, the gap should be set so that the overvoltage caused by the lightning surge etc. can be quickly operated and the overvoltage caused by the lightning surge etc. can be suppressed. It is necessary to make the length G as small as possible.
[0024]
Therefore, even when the gap length G is small, the gap adjustment gauge 13 is used so that the gap length G can be easily set to a predetermined specified value. The gap adjustment gauge 13 is detachably mounted on the element side electrode 8 of the lightning arrester 4 as shown by the broken line in FIG. 1, and the element side electrode 8 of the lightning arrester 4 and the wire side electrode 19 of the power transmission / distribution line 1. The gap length G of the discharge gap 11 formed between the two is regulated.
[0025]
The gap adjustment gauge 13 has a structure as shown in FIGS. 4 and 5A to 5C, for example. The gap adjustment gauge 13 is composed of an insulating resin cylindrical member 14 that is detachably fitted to the element side electrode 8 so as to hold the element side electrode 8 of the lightning arrester 4. A part of the structure is provided with an opening 15 that is separated from the element side electrode 8 of the lightning arrester 4 and can be pulled out sideways. Further, a strap 16 is attached to the side wall portion of the cylindrical member 14, and after the gap adjustment, the gap adjustment gauge 13 can be detached from the opening portion 15 of the side wall portion by pulling the strap 16 sideways. It has a structure.
[0026]
In a state where the base end portion of the gap adjustment gauge 13 is attached to the element side electrode 8 of the lightning arrester 4, the cylindrical member 14 that abuts the tip end portion of the element side electrode 8 and the lower end portion of the insulating member 20 of the insulating cover 10. The length dimension of the cylindrical member 14 is defined so that the distance from the tip of the cylinder member becomes the length g of the air gap. If the length dimension of the cylindrical member 14 is defined to a predetermined value from the length g of the air gap, the length of the discharge hole 21 between the lower end portion of the insulating member 20 and the lower end portion of the electric wire side electrode 19 is determined. Since the length g ′ is defined in advance, a predetermined gap length G obtained by adding the length g ′ of the discharge hole 21 to the length g of the air gap is defined.
[0027]
The attachment procedure for attaching the lightning arrester 4 to the insulator 2 using the gap adjustment gauge 13 is as follows. First, the base end portion of the gap adjustment gauge 13 is attached in advance to the element side electrode 8 of the lightning arrester 4. As shown in FIG. 6, the gap adjustment 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 is slid 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 the arrow s in FIG. 1). By using a long hole formed in a part of the mounting bracket 12 along the vertical direction, the lightning arrester 4 is provided. Adjust the position vertically. By this position adjustment, the tip end portion of the gap adjustment gauge 13 attached to the element side electrode 8 of the lightning arrester 4 is brought into contact with the lower end portion of the insulating member 20 provided at the lower portion of the insulating cover 10 of the power transmission and distribution line 1.
[0028]
In this way, the length g of the air gap between the element side electrode 8 of the lightning arrester 4 and the lower end of the insulating member 20 can be obtained simply by bringing the tip of the gap adjustment gauge 13 into contact with the lower end of the insulating member 20. Is defined as a predetermined value. If the length g of the air gap is defined to a predetermined value, the length g ′ of the discharge hole 21 is defined in advance between the lower end portion of the insulating member 20 and the wire-side electrode 19. Definition of a predetermined gap length G between the element side electrode 8 of the lightning arrester 4 and the wire side electrode 19 of the transmission / distribution line 1 by summing the length g of the air gap and the length g ′ of the discharge hole 21 Can be set to a value.
[0029]
Thereafter, as shown in FIG. 7, the gap adjustment gauge 13 can be detached from the element side electrode 8 through the opening 15 by pulling the strap 16 of the gap adjustment gauge 13 to the side. 13, the installation of the lightning arrester 4 is completed in a state where the gap length G is set to a predetermined specified value.
[0030]
The lightning arrester 4 is attached to the insulator 2, the position of the lightning arrester 4 is adjusted by the mounting bracket 12, and the gap adjustment gauge 13 is removed by an indirect hot wire method. This indirect hot wire construction method is to perform a predetermined work without directly touching the live wire by using a long insulating operation rod (indirect hot wire tool) in the distribution line high voltage hot wire work. It is a construction method that can be used. By using this indirect hot wire method, it is not necessary to protect live parts, etc., so the work time can be shortened and work can be performed away from the live wire, so there is no risk of electric shock. The work environment can be secured, and further, the fatigue of workers can be reduced by eliminating the need for protective equipment and armor.
[0031]
【The invention's effect】
According to the present invention, when the lightning arrester is attached to the insulator in a state where the element side electrode is opposed to the wire side electrode of the transmission and distribution line via the discharge gap, the lightning arrester is detachable from the element side electrode of the lightning arrester. By using a gap adjustment gauge that is mounted and regulates the gap length of the discharge gap, even when the gap length in the discharge gap is small, the gap length can be easily adjusted, and the dimensions of the insulator and the like The adjustment work of the gap length due to tolerance is not required, and a lightning arrester having desired discharge characteristics can be attached to the insulator by simple means even at the installation site and the like, and the workability is greatly improved.
[0032]
In addition, since the gap length can be adjusted reliably, the reliability of the protection performance of the lightning arrester is greatly improved, and the performance of protecting peripheral equipment including insulators can be greatly improved by the lightning arrester, such as contact. It is possible to prevent unforeseen accidents and improve safety.
[Brief description of the drawings]
FIG. 1 is a front view illustrating a state in which a gap adjustment gauge is attached to a lightning arrester attached to a lever for explaining an embodiment of the present invention.
2 is a cross-sectional view of FIG. 1 including a partial cross-sectional view for explaining the positional relationship between the wire-side electrode in the insulating cover of the transmission / distribution line and the element-side electrode of the lightning arrester in the embodiment of the present invention. FIG.
3 is a front view including a partial cross-sectional portion showing the electric wire side electrode and the insulating member of FIG. 2. FIG.
FIG. 4 is a perspective view showing a gap adjustment gauge used in the present invention.
5A is a front view showing a gap adjustment gauge, FIG. 5B is a cross-sectional view taken along line AA of FIG. 5A, and FIG. 5C is a rear view of FIG.
FIG. 6 is an enlarged partial cross-sectional view of a main part showing a state in which a gap adjustment gauge is mounted on an element side electrode of a lightning arrester.
FIG. 7 is an enlarged partial cross-sectional view of a main part showing a state in which the gap adjustment gauge is removed from the element side electrode of the lightning arrester.
FIG. 8 is a front view showing a state in which a lightning arrester is attached to an insulator, for explaining a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission / distribution electric wire 2 Insulator 4 Lightning arrester 7 Ground side electrode 8 Element side electrode 11 Discharge gap 12 Mounting bracket 13 Gap adjustment gauge 14 Cylindrical member 15 Opening part 19 Electric wire side electrode G Gap length

Claims (3)

Detachably fitted to embrace the element-side electrode on the element side electrode of the arrester system mounted through the mounting bracket to the ground portion of the insulator for supporting the wire, the element-side electrodes of the lightning arrester It consists of an insulating cylindrical member having a predetermined length that regulates the gap length of the discharge gap formed between the electric wire side electrode provided on the electric wire, and the element side A gap adjustment gauge characterized in that an opening is formed that can be pulled out to the side by being detached from the electrode . The gap adjustment gauge according to claim 1 , wherein a strap for pulling out the tubular member to the side is attached to a portion of the tubular member on the side opposite to the opening. When a lightning arrester is attached to the grounding side portion of the insulator supporting the electric wire via a mounting bracket, and the element side electrode of the lightning arrester is disposed opposite to the electric wire side electrode provided on the electric wire via a discharge gap, A base end portion of a gap adjustment gauge made of an insulating cylindrical member having a predetermined length for regulating the gap length of the discharge gap is held by the element side electrode of the lightning arrester. fitting to the lightning arrester positioning while regulating the gap length of the discharge gap by aligning the distal end portion of the gap adjustment gauge against wire-side electrode, then the side wall portion of the tubular member A method of attaching a lightning arrester, wherein the gap adjusting gauge is detached from an element side electrode through a partly formed opening and is pulled out and removed laterally .

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