JP4993595B2 - Arc horn - Google Patents

Description

  The present invention relates to an arc horn that protects an insulator that supports an overhead power transmission line from lightning damage.

The overhead power transmission line is supported by the steel tower via an insulator, but if the insulator is destroyed due to lightning damage, power transmission is stopped. Therefore, an arc horn is provided as a means for protecting the insulator from lightning damage.
10 (a) and 10 (b) are a schematic diagram of a state where an overhead power transmission line is supported on a steel tower, and a configuration explanatory diagram of a conventional arc horn. As shown in FIG. 10 (a), the overhead power transmission line 100 is supported by the steel tower 102 via the insulator 101. However, when an overcurrent due to lightning strikes the overhead power transmission line 100, a dielectric breakdown occurs and a ground fault or short circuit occurs. Since an accident occurs, an arc horn 110 is provided on the insulator 101 that supports the overhead power transmission line. The arc horn 110 is a metal member for safely discharging an overcurrent generated due to lightning and preventing the insulator from being overheated due to creeping discharge from the insulator surface. By guiding the arc generated on the insulator surface by the discharge to the arc horn, the porcelain constituting the insulator can be prevented from being destroyed by heat.
A conventional arc horn 110 is a metal rod whose base is fixed by bolts 106 to support portions 105 provided at both ends of the insulator 101 as shown in FIG. 10 (b). When exchanging, it is necessary to finely adjust the interval (insulation interval) Z between the tip portions of the arc horn in millimeters. In the adjustment, the inclination angle of the arc horn is finely adjusted using a margin between the bolt diameter and the inner diameter of the screw hole into which the bolt is screwed.

When a flash is generated between the arc horns 110 due to a lightning strike and the arc horn tip is melted, the insulation interval Z is distorted and needs to be replaced. However, since the conventional arc horn is composed of a single metal rod, it is necessary to replace the entire arc horn. In this way, every time the horn tip melts down due to a lightning strike, the entire arc horn was replaced by climbing the steel tower, which not only increased the parts cost, but also required a lot of time and labor. There was a need for improvement.
Further, in order to finely adjust the insulation interval Z between the arc horns attached to each support portion 105, it is necessary to adjust the angle of the arc horn with the bolt 106 loosened, so that the XY coordinates are likely to be distorted. Fine adjustment in millimeters was difficult.

Patent Document 1 discloses a line-side main horn, a fixed part that fixes at least one main horn of the ground-side main horn to the insulator side, and a movable part that is stretchably supported by the fixed part. An arc horn constructed from the above is disclosed. According to this, the insulation interval between the main horns can be finely adjusted.
However, the arc horn in this conventional example still has a problem that when the tip of the movable part is melted by lightning, it is not possible to replace only the movable part and the entire arc horn needs to be replaced. .
Further, in this conventional example, a step (corner) is formed by the end portions of the fixed portion and the movable portion, so that discharge easily occurs from the corner portion of the step, and local portions other than the tip portion of the arc horn are provided. It causes melting and shortens the service life. Moreover, since the fixed part and the movable part are fastened by a normal bolt, there is also a problem that electric discharge is easily generated from the head of the bolt protruding from the arc horn peripheral surface.
JP 2001-126563 A

A conventional arc horn is composed of a single metal rod or two metal members connected in a stretchable manner, and if the tip of the horn is melted and damaged by lightning strike, the entire arc horn must be replaced. Had to be replaced. Further, in Patent Document 1, since a step is formed between the fixed portion and the movable portion or the head portion of the bolt protrudes, the discharge of the arc horn is caused by the discharge generated at the step portion or the bolt head. There was a problem that the lifetime was shortened.
The present invention has been made in view of the above, and when the arc horn tip is melted due to lightning strike, it is necessary to replace only the melted tip member without replacing the entire arc horn. Another object of the present invention is to provide an arc horn that can reduce the time and cost.

In order to solve the above-mentioned problems, the invention of claim 1 is an arc horn composed of a ground horn and a wire horn respectively disposed at both axial ends of an insulator, wherein at least one of the horns is the insulation horn. a fixing member that having a thin portion is fixed to the insulator-side to the tip portion, is composed of a tip member having a thin portion, the removable interchangeable and slidably supported by the base end portion relative to the fixed member The fixing member and the connecting member are connected steplessly when the one surface of the thin portion of the fixing member and the one surface of the thin portion of the tip member are brought into close contact with each other using a connecting member. A step between the two members by sliding the tip member with respect to the fixing member, adjusting an insulation interval between the tip member and the other horn tip, and fixing at an arbitrary position by the connecting member; Part formed When the, characterized in that so as to eliminate the stepped portion between the fixing member and the tip member by burying a conductive material in the stepped portion.
An arc horn that has been conventionally configured as a single metal member is composed of a fixed member and a tip member, and the tip member is configured to be exchangeable with the fixed member. When the insulation interval fluctuates, it is possible to restore the arc horn by only replacing the tip member.
By making it possible to replace only the tip member instead of the entire arc horn, it is possible to reduce the materials used when the arc horn is restored and promote resource saving. Furthermore, materials are carried in manually in the mountainous areas, but compared to transporting heavy objects such as arc horns, transporting only the tip member reduces the weight of the material by half. Greatly reduces labor and burden.

Moreover, what is necessary is just to adjust the position of the front-end | tip member supported by the connection member with respect to the fixing member so that the insulation space | interval between horns may be adjusted .
In addition, since the flat surfaces of the two thin portions are connected in close contact with each other, the fixing member and the tip member can be connected without a step, so that a problem that an arc from the step portion is generated can be prevented.
Further, by filling the stepped portion with a conductive material, it is possible to prevent the occurrence of an arc.

Invention 請 Motomeko 2 resides in that in Claim 1, wherein said fixing member, and the end corner portion of the tip member is chamfered to R shape.
When the tip member is configured to be slidable with respect to the fixed member, if there is a corner at the end of each member, an arc is generated from the corner, but the generation of the arc can be prevented by chamfering the corner. .

According to a third aspect of the present invention, in the first or second aspect , in the case where the connecting member is constituted by a bolt and a nut having a large-diameter head, the fixing member and the tip end are inserted to insert the bolt. A fitting recess for fitting and burying the bolt head and the nut is provided so as to communicate with a screw hole or a long hole formed in the member.
When bolts and nuts having a large-diameter head are used, a fitting recess is formed so that they do not protrude from the outer surface of the horn .

According to a fourth aspect of the present invention, in any one of the first to third aspects, a hollow portion is provided in at least a part of the tip member.
Since the overcurrent flowing through the tip member flows through the surface layer, it may be made hollow to reduce the weight. Moreover, since the hollow part can be visually confirmed when the thin part which comprises the outer skin of a hollow part melts down, it becomes easy to confirm a melted state .

  As described above, according to the present invention, in the arc horn composed of the ground-side horn and the wire-side horn respectively disposed at both ends in the axial direction of the insulator, at least one horn is fixed to the insulator side. And a tip member that can be attached to and detached from the fixing member, so that if the arc horn tip is melted by lightning strike, the melted tip member is replaced without replacing the entire arc horn. By doing so, the labor, time, and cost required for replacement can be reduced.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
FIG. 1 is a view showing a mounting state of an arc horn according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are a front view showing a main part configuration of the arc horn and a plan view of each part. .
The arc horn 1 includes a ground-side horn 2 and a line-side horn 3 respectively disposed at both ends in the longitudinal direction (axial direction) of an insulator 20 supported by an arm of a steel tower (not shown).
Support portions 21 and 22 are provided at both ends of the insulator 20, and the ground side horn 2 and the wire side horn 3 are respectively fixed to the support portions 21 and 22 by bolts (connection members) 23. Yes.
The arc horn 1 of the present invention includes at least one of a ground side horn 2 and a line side horn 3 that is fixed to the insulator side (support portion), and a detachable exchange with respect to the fixed member 5. The point comprised from the possible tip member 10 is the characteristic. Below, the case where the line side horn 3 is comprised from the fixing member and the front-end | tip member is demonstrated as an example.

A base end portion of the fixing member 5 has a screw hole 5a for fixing to the support portion 22 with a bolt 23, and a distal end portion has a thin portion 5b having a flat upper surface. A long hole 5c extending in the longitudinal direction is formed in the flat upper surface of the thin portion 5b at a required depth d1, and the lower surface of the thin portion 5b has a required depth d2 and is longer than the long hole 5c. A long hole (fitting recess) 5d having a large width is formed. Both elongated holes 5c and 5d communicate with each other.
The base end portion of the tip member 10 is provided with a thin portion 10a having a flat bottom surface, and the flat bottom surface of the thin portion 10a is dimensioned so as to be in close contact with the flat top surface of the thin portion 5b of the fixing member. Yes. The cross-sectional shape of the joint portion between both thin portions 5b and 10a is, for example, a circular shape, and there is no outer peripheral surface n protruding portion.
A screw hole 10b communicating with the elongated hole 5c of the fixing member is formed through the thin-walled portion 10a of the tip member. A large-diameter recess (fitting recess) 10c is formed coaxially at the upper end of the screw hole 10b.
The lower surface of the thin portion 10a of the tip member 10 is brought into close contact with the upper surface of the thin portion 5b of the fixing member 5, and the nut (connecting member) 26 is disposed in the long hole 5d of the fixing member so as to extend from the screw hole 10b. The fixing member and the tip member can be fixed by inserting the male screw portion of the bolt 25 through the hole 5c and screwing it with the nut 26. At this time, the head of the bolt 25 is fitted in the large-diameter recess 10c, and the nut 26 is fitted in the elongated hole 5c, so that there is no protrusion on the outer surface of the fixing member 5 and the tip member 10. It will be buried.

In the above example, a long hole is provided on the fixed member side and a screw hole is provided on the tip member side, but this may be reversed.
Further, instead of providing a screw hole in the thin portion 5b of the fixing member 5, a long hole having a two-stage structure similar to the tip member side may be formed. In this case, the bolt head is fitted into an outer large-diameter slot (fitting recess) in the two-stage slot provided in the thin portion 5b of the fixing member.
Moreover, although the case where the line side horn 3 was comprised from the fixing member and the front-end | tip member was shown in the said example, it is as above-mentioned that you may comprise the line-side horn 2 from a fixing member and a front-end | tip member. .
In the present invention, since the thin-walled portions 5b and 10a are fastened using the bolt 25 and the nut 26 using the screw hole 10b and the long hole 5c, the tip member 10 is slid with respect to the fixing member 5. It is possible to finely adjust the longitudinal position of the tip member in millimeters, and it is possible to finely adjust the insulation interval with the other horn 3.
In addition, since the bolt head and the nut do not protrude from the outer surface, an arc is not generated from a portion other than the tip portion of the tip member during discharge, and there is no possibility that the local portion of the arc horn is melted.
In addition, when the tip member 10 is pulled out from the fixing member 5 as shown in FIG. 3, a stepped portion (gap) is formed between the end of each thin portion 5b, 10c and the thick portion. If an arbitrary conductor 15 such as copper or lead is embedded in the gap to fill the gap, it is possible to prevent an arc from being generated from the corner of the stepped portion.

4 (a) and (b) is a modification of the present invention, the end portion corners of the thin portion 5b of the fixing member 5, the thin portion 10 a of the tip member 10 end corners respectively R-like A chamfered portion 15 is formed, and a similar R-shaped chamfered portion 16 is also formed at the end corners of the thick portions of the fixing member and the tip member. According to this, as shown in (b), even if the tip member 10 is fixed in a state where it is pulled out from the fixing member 5, there is no corner, so that an arc is generated from the R-shaped chamfers 15 and 16. There is no risk of occurrence.
A stepped portion (recess) formed between the end portions of each member may be filled with the conductor to form a stepless shape.
In the above embodiment, since a bolt and a nut having a large-diameter head are used together as means for fastening the fixing member and the tip member, it is necessary to form a large-diameter recess 10c at the inlet of the screw hole 10b. However, it is necessary to provide a large-diameter recess 10c in the screw hole 10b by using a screw that does not have a large-diameter head such as a coffin screw (connecting member) and a nut (connecting member) instead of a bolt. The number of processing steps can be reduced.

Next, FIGS. 5A and 5B are a cross-sectional view and an exploded perspective view showing the configuration of the main part of another embodiment of the arc horn of the present invention, in which a hole 6 is formed in the end face of the fixing member 5. On the other hand, a protrusion 11 that fits tightly into the hole 6 is formed at the end of the tip member 10. Further, a long hole 11 a penetrating vertically is formed in the protrusion 11, and a screw hole 7 a communicating with the long hole 11 a is formed in a portion 7 positioned above and below the hole 6. In a state where the protrusion 11 of the tip member 10 is fitted in the hole 6 of the fixing member 5 and the position is determined, the screw hole 7a is passed through the elongated hole 11a and the other screw hole 7a is threaded 30 or the like. The tip member 10 can be fixed to the fixing member 5 by screwing a screw member having no large-diameter head. At this time, by appropriately setting the length of the scissors screw 30, it is possible to prevent the end portions of the scissors screws from protruding from the outer surfaces of the fixing member and the tip member.
Instead of the hole 6, a recess that branches the end surface of the fixing member into a bifurcated shape may be formed. Further, the hole 6 may be provided on the end surface of the tip member, and the protrusion 11 may be provided on the end surface of the fixing member 5.

Next, FIG. 6 is a modification of the arc horn of FIG. 5. In this embodiment, the protrusion 11 extending from the tip member 10 does not have a long hole, and the screw 30 that is screwed into the screw hole 7a is shown in FIG. The fixing strength of the tip member 10 is increased with respect to the fixing member 5 by pressing the pointed tip portion 30 a onto the flat surface of the protrusion 11. In addition, you may form the minute unevenness | corrugation (slip prevention) for making it easy to latch the front-end | tip part 30a of the scissors screw on the surface of a protrusion. The screw holes 7a may be provided on the front and back both sides of the fixing member 5 as shown, or may be provided only on one side.
According to this embodiment, it is possible to adjust the position (insulation interval) for fixing the tip member 11 over a wide span as compared with the embodiment of FIG.

  Next, FIGS. 7A and 7B are cross-sectional views showing the main configuration of an arc horn according to another embodiment of the present invention. The arc horn 1 according to the embodiment of FIG. 7A is characterized by a configuration in which a hollow portion 15 (thin wall portion 16) is provided inside the tip member 10. That is, most of the overcurrent flowing into the arc horn flows on the surface of the horn. Therefore, by setting the amount of metal that disappears due to melting damage to the thickness of the thin portion 16 in advance, the weight can be further reduced. You can plan. As shown in FIG. 7B, the hollow portion 15 may be filled with a dielectric material 17 as necessary.

Next, FIG. 8 is a partial cross-sectional view showing the main configuration of an arc horn according to another embodiment of the present invention.
The arc horn 1 according to this embodiment includes a connecting member 35 that connects the fixing member 5 and the tip member 10 so that the fixing member 5 and the tip member 10 are detachable and adjustable in insulation distance, a threaded hole 36 provided on the end surface of the fixing member 5, 10, a threaded protrusion 37 that is provided on the end face 10 and is screwed into the threaded hole 36, and a nut 38. When the threaded protrusion 37 is screwed into the threaded hole 36, a nut 38 is fastened to the male screw part 37 a of the threaded protrusion 37 that is exposed to the outside from the threaded hole 36, and the tip member 10 with respect to the fixing member 5. The positional relationship (insulation interval) can be fixed to a predetermined value. The space S formed between the threaded hole 36 and the threaded protrusion 37 may be filled with a conductive material as necessary.
Instead of using the nut 38 as a means for fixing the fixing member 5 and the tip member 10, a screw having a sharpened tip as shown in FIG. 6 is provided on the fixing member (the outer wall portion of the threaded hole 36). Alternatively, it may be screwed from a screw hole (not shown) and fixed to the threaded protrusion 37 by a sharp tip.
Since the tip member 10 rotates with respect to the fixing member 5, the tip portion of the tip member 10 is made substantially spherical so as not to have directionality.

Next, FIG. 9 is a configuration explanatory view of an arc horn according to another embodiment of the present invention.
The arc horn 1 according to this embodiment includes a connecting member 40 that is a hollow cylindrical body that connects the fixing member 5 and the tip member 10 so as to be detachable and adjustable in insulation interval. A male screw part (screw part) 8 is provided at the end of the fixing member 5, and a threaded protrusion 18 is provided at the end of the tip member 10. The male screw portion 8 at the end of the fixing member is screwed with the screw portion 41 provided at one end inner diameter of the connecting member 40, while the threaded protrusion 18 at the end of the tip member is provided at the inner diameter of the connecting member. Screwed onto the screw portion 42. When the threaded protrusion 18 is screwed onto the threaded portion 41 of the connecting member 40, a nut (connecting member) is attached to the male threaded portion (threaded portion) 18 a of the threaded protruding portion 18 exposed to the outside from the other end of the connecting member 40. 45 can be fastened to fix the positional relationship (insulation interval) of the tip member 10 with respect to the fixing member 5 to a predetermined value.

When assembling, first, the screw portion 41 of the connecting member 40 is screwed to the male screw portion (screw portion) 8 of the fixing member 5, and then the male screw of the tip member is engaged with the screw portion 42 on the inner periphery of the connecting member 40. The length is adjusted by screwing the portion 18a. At this time, the connecting member and the tip member are fixed by the nut 45 screwed in advance to the male screw portion 18a protruding from the connecting member. Next, the connecting member 40 and the tip member 10 are removed from the male screw portion 8 of the fixing member, and the conductive member 50 is filled in the void S formed in the end of the connecting member 40 to fill the void. After the void S is filled with the conductive member 50, the screw portion 41 of the connecting member 40 is screwed again to the male screw portion 8 to complete the fixing of the tip member 10.
The conductive member 50 is made of, for example, a coin-shaped (circular plate-shaped) metal having an outer diameter matching the inner diameter of the void S, and a plurality of the conductive members 50 are stacked and filled in the void S. Fill. Alternatively, a soft conductive material such as clay may be used.

Alternatively, a female screw portion may be provided at the end portion of the fixing member instead of the male screw portion 8, and the male screw portion provided on the outer periphery of the end portion of the connecting member 40 may be screwed onto the female screw portion.
Instead of using the nut 45 as a means for fixing the connecting member 40 and the tip member 10, a screw having a sharpened tip as shown in FIG. 6 is screwed from a screw hole (not shown) provided in the connecting member 40. In this case, the threaded protrusion 18 may be fixed by a sharp tip.
As described above, according to the arc horn 1 of the present invention, when the tip end portion of the tip member 10 is melted and damaged by lightning strike, the entire horn is renewed when the insulation interval Z between the tip end portion of the other horn is expanded. It is possible to replace only the tip member 10 without exchanging the parts. As for the adjustment of the insulation interval Z, the positional relationship of the tip member 10 with respect to the fixing member 5 may be adjusted and then fastened and fixed by a bolt, a nut, a saddle screw or the like as a connecting member.

Conventionally, when it is necessary to readjust the insulation interval after setting the insulation interval once, or when it is necessary to adjust the insulation interval accordingly when the number of insulators to be installed is increased, the entire arc horn However, in the present invention, only the tip member needs to be replaced. For this reason, the replacement work of the horn and the adjustment work of the insulation interval can be simplified, and the material cost associated with the replacement can be reduced.
In addition, by making it possible to replace not only the entire arc horn but only the tip member, it is possible to reduce the materials used when the arc horn is restored and promote resource saving. In addition, most of the power transmission towers are installed in mountainous areas, and considering the fact that materials are carried in manually at the site construction in the mountainous areas, compared to transporting many arc horns, Transporting only the members provides the advantage of reducing the labor and burden of the operator by halving the weight of the material to be transported.

Since the tip member is configured to be movable with respect to the fixed member using the connecting member, the insulation interval between the horns can be easily adjusted.
By connecting the flat surfaces of both thin portions in close contact with each other, the fixing member and the tip member can be connected without a step, and therefore a problem that an arc is generated from the step portion can be prevented.
When the tip member is configured to be slidable with respect to the fixed member, if there is a corner at the end of each member, an arc is generated from the corner, but the generation of the arc can be prevented by chamfering the corner. .
By filling the stepped portion with a conductive material, arcing can be prevented.
When bolts and nuts having a large-diameter head are used, a fitting recess is formed so that they do not protrude from the outer surface of the horn.

By using the scissors screw 30 having a sharp tip and a groove for fastening by a driver or the like at the other end, the axial position of the tip member relative to the fixing member can be adjusted steplessly.
Since the overcurrent flowing through the tip member flows through the surface layer, it may be made hollow to reduce the weight. Moreover, since the hollow part can be visually confirmed when the thin part 16 which comprises the outer skin of the hollow part 15 melts, it becomes easy to confirm a melted state.
The fixing member 5 and the tip member 10 may be connected by screw connection.
Fastening with good workability is possible by fastening the fixing member and the tip member with the nut.
The fixing member and the tip member may be screwed together via the connecting member 40, and adjustment workability can be improved.

It is a figure which shows the attachment state of the arc horn which concerns on one Embodiment of this invention. (A) And (b) is the front view which shows the principal part structure of an arc horn, and the top view of each part. It is composition explanatory drawing of the arc horn which concerns on other embodiment of this invention. (A) And (b) is a structure explanatory drawing of the modification of this invention. (A) And (b) is sectional drawing which shows the principal part structure of other embodiment of the arc horn of this invention, and an exploded perspective view. (A) And (b) is sectional drawing which shows the structure of the modification of the arc horn of FIG. 5, and an exploded perspective view. (A) And (b) is sectional drawing which shows the principal part structure of the arc horn which concerns on other embodiment of this invention, respectively. It is a partial cross section figure which shows the principal part structure of the arc horn which concerns on other embodiment of this invention. It is composition explanatory drawing of the arc horn which concerns on other embodiment of this invention. (A) And (b) is the schematic of the state which supported the overhead power transmission line in the steel tower, and the structure explanatory drawing of the conventional arc horn.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Arc horn, 2 ... Ground side horn, 3 ... Line side horn, 5 ... Fixing member, 5a ... Screw hole, 5b ... Thin wall part, 5c ... Long hole, 5d ... Long hole, 6 ... Hole, 7a ... Screw hole , 10 ... tip, 10a ... thin portion, 10b ... screw hole, 10c ... large-diameter recess, 1 1 ... projections, 11a ... elongated hole, 15 ... hollow portion, 16 ... thin portion, 18 ... threaded projection 20 ... Insulator, 21, 22 ... Supporting part, 23 ... Bolt, 25 ... Bolt, 26 ... Nut, 30 ... Nail screw, 30a ... Pointed tip, 36 ... Screwed hole, 37 ... Threaded protrusion, 38 ... Nut, 40 ... Connection member, 41 ... Screw part, 42 ... Screw part, 45 ... Nut (connection member), 50 ... Conductive member.

Claims (4)

An arc horn composed of a ground-side horn and a wire-side horn respectively disposed at both axial ends of the insulator,
At least one of the horn, the fixed member that is fixed to the insulator side having a thin portion at the tip portion, the thin portion to removably replaceable and is slidably supported by the base end portion relative to the fixed member a tip member having, consists,
The fixing member and the connecting member are configured to be connected steplessly when the one surface of the thin portion of the fixing member and the one surface of the thin portion of the tip member are brought into close contact with each other using a connecting member,
The tip member is slid with respect to the fixing member, the insulation interval between the tip member and the other horn tip is adjusted, and fixed at an arbitrary position by the connecting member, so that a stepped portion is formed between the two members. The arc horn is characterized in that when the step is formed, a stepped portion between the fixing member and the tip member is eliminated by embedding a conductive material in the stepped portion . The arc horn according to claim 1, wherein the corners of the fixing member and the tip member are chamfered in an R shape. When the connecting member is composed of a bolt and a nut having a large-diameter head, the connecting member communicates with a screw hole or a long hole formed in the fixing member and the tip member in order to insert the bolt. The arc horn according to claim 1 or 2 , further comprising a fitting recess for fitting and burying the bolt head and the nut, respectively. The arc horn according to any one of claims 1 to 3 , wherein a hollow portion is provided in at least a part of the tip member.

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