JP2018137907A - Cover for overhead electric line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover for an overhead electric line, which can protect an electric line for a long period of time without having a risk of infiltration or accumulation of rain water.SOLUTION: In the cover for an overhead electric line, halved covers 1a and 1b are integrally formed by interposing a hinge part 2 so as to be openable and closable, concave parts 3a and 3b are formed in an inner surface in which the halved covers face each other, an exposure live part of an electric wire is stored in the concave part, and the exposure live part is covered with the halved covers 1a and 1b so as to position the hinge part 2 above the exposure live part. A wide flange 9 positioned above the exposure live part is formed in an inner surface on a lower side of the hinge part 2, a seal material storing parts 11a and 11b storing a seal material 12 in close contact with a circumference of an electric line d are formed on both sides of the concave parts 3a and 3b, water discharging grooves 15a and 15b connected with an upper surface of the wide flange 9 are formed on the outside of the seal material storing parts 11a and 11b, and electric line leading-out parts 17a and 17b from which the electric line d is led out are formed in the outside edge of the water discharging grooves 15a and 15b.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a synthetic resin cover that is attached to an insulator mooring portion, an electric wire connection portion, or the like of an overhead electric wire.

In FIG. 1, a support metal fitting c is fixed to an upper portion of an insulator b provided upright on a brace a of a utility pole, and a bare wire portion g obtained by partially peeling off the insulation coating of the overhead electric wire d is attached to the support metal fitting c. A state where the electric wire d is moored to the insulator b by being clamped and supported by the provided clamping portion e is shown. In addition, f is a discharge terminal (arc horn) provided so as to protrude obliquely downward from the support fitting c in order to release a high voltage current during a lightning strike.
The insulator mooring portion of such an electric wire d is conventionally covered with a cover made of a synthetic resin having high electrical insulation, and the support fitting c etc. through which electricity is communicated in a normal use state is covered with the cover, so that birds This prevents wire etc. carried for nesting from coming into contact with the support metal fittings c and the like and causes a short circuit accident, and also prevents insulation from being damaged or deteriorated by rainwater containing salt. I have to.

  In addition, the following patent document 1 and patent document 2 show an insulating cover that covers a suspension insulator for hanging a trolley wire of a railway. Patent Document 3 below shows a cover that covers a branch connection portion of an overhead electric wire, Patent Document 4 below shows a cover that covers a retention clamp, and Patent Document 5 shows a cover for repairing an electric wire. Has been. Thus, by providing the synthetic resin cover at the connection portion of the overhead electric wire, a waterproof measure has been conventionally taken to prevent a short circuit accident and prevent rainwater from entering the cover.

JP 2001-195936 A JP2011-210498 JP2002-252918 6-29336 JP2009-261046

By the way, the conventional electric wire cover as shown in the above-mentioned Patent Documents 1 to 5 is waterproofed so that rainwater does not enter the cover by watertightly filling an adhesive sealing material such as butyl rubber. It was. However, such a sticky or elastic sealing material deteriorates over the years, and its adhesiveness, flexibility, elasticity, etc. are impaired, so there is a problem that waterproofness is not maintained for a long time. is there. In addition, once rainwater enters, the rainwater may accumulate in the cover, which may have a further adverse effect.
Further, when the conventional wire cover is opened for inspection, the adhesiveness of the sealing material is impaired and the waterproof property is remarkably lowered, so that there is a problem that maintenance is not easy.
Therefore, the present invention is intended to provide a cover for an overhead electric wire that does not depend on a seal material and is waterproof for a long period of time and easy to maintain.

  For this purpose, the present invention is formed integrally with a hinge portion so that a pair of half-cut covers can be opened and closed by an electrically insulating synthetic resin, and recessed portions are formed on the opposing inner surfaces of the half-cut covers, An overhead electric wire cover in which the exposed charging portion of the electric wire is accommodated in the recessed portion, and the half cover is covered with the exposed charging portion so that the hinge portion is positioned above the exposed charging portion. A horizontally long flange is formed on the lower inner surface of the hinge portion so as to be positioned above the exposed charging portion, and a sealing material accommodating portion for accommodating a sealing material in close contact with the periphery of the electric wire is formed in the recessed portion. The drainage groove formed on both sides of the horizontal flange and connected to the upper surface of the horizontally long flange is formed outside the sealing material accommodating portion, and the wire lead-out portion from which the electric wire is led out is formed on the outer edge of the drainage groove. Features.

In the above-described overhead wire cover, the horizontal flange is integrally formed on the inner surface of one half-cut cover, and the horizontal groove into which the horizontal flange is fitted is formed on the inner surface of the other half-cut cover. And
In the above-described overhead wire cover, the drainage groove connected to the upper surface of the horizontally long flange is partly formed in an annular shape so as to bypass the wire on the outer side of the seal material accommodating portion.
Thus, in the overhead wire cover according to the present invention, even if rainwater enters from the hinge portion or the wire lead-out portion, the rainwater is discharged to the outside through the drainage groove without flowing into the exposed charging portion. Therefore, waterproofness is maintained over a long period.

  In high-voltage distribution equipment, where electricity is communicated in normal use, it is defined as “Charging Unit” in the same meaning as the electric circuit in Article 1 (Definition of Terms) No. 1 of the Ministry of Electricity Ordinance. Therefore, in the explanation of the present invention, an exposed portion where electricity such as the support fitting c, the sandwiching portion e, and the bare electric wire portion g in the insulator mooring portion is always communicated is referred to as an “exposed charging portion”. .

  In the overhead wire cover according to the present invention, the waterproofness is maintained over a long period of time, and there is no possibility that rainwater accumulates in the cover. In addition, it is possible to provide an overhead electric wire cover that is easy to maintain and highly reliable with respect to waterproofness.

The perspective view which shows the insulator mooring part of an overhead electric wire. The perspective view of the inner surface at the time of expansion | deployment of the cover for overhead electric wires which shows embodiment of this invention. The perspective view of the outer surface at the time of expansion | deployment of the cover for overhead electric wires which shows embodiment of this invention. AA line sectional view of Drawing 3. The perspective view when the overhead wire cover which shows embodiment of this invention is attached to the insulator mooring part. The longitudinal cross-sectional view when the overhead wire cover which shows embodiment of this invention is attached to the insulator mooring part. The cross-sectional view when the overhead wire cover which shows embodiment of this invention is attached to the insulator mooring part. The longitudinal cross-sectional view which shows embodiment of the cover for overhead wires attached to the connection part of an overhead wire. The longitudinal cross-sectional view which shows embodiment of the cover for overhead wires attached to the branch connection part of an overhead wire. The longitudinal cross-sectional view which shows embodiment of this invention as a cover of the retention clamp which fastens an overhead electric wire.

  Next, a description will be given of an overhead wire cover that covers the insulator mooring portion shown in FIG. 1 according to an embodiment of the present invention. This cover is integrally formed of a synthetic resin with high electrical insulation, and as shown in FIGS. 2 to 4, the pair of half-cut covers 1a and 1b are slightly thin half-cylinders so that they are flexible. The hinge part 2 is formed so that it can be opened and closed with the hinge part 2 in between, and both end parts 2a and 2b of the hinge part 2 are formed in a tapered shape with a small diameter to prevent rainwater from entering. Concave portions 3a and 3b are formed on the opposing inner surfaces of the half covers 1a and 1b. Then, the half cover 1a, 1b is refracted by the hinge part 2 so that the hinge part 2 is on the upper side, and the half cover 1a, 1b is applied to an exposed charging part such as an insulator mooring part as shown in FIG. The exposed charging portion is accommodated in the recessed portions 3a and 3b.

  The concave and recessed portions 3a, 3b are on the left and right sides and below (FIG. 2 is a developed view of the half covers 1a, 1b, so the half cover 1a in FIG. 2 is shown above. For the convenience of explanation, the upper and lower sides are represented in the opposite direction.), And the lead-out port 4a for leading the discharge terminal f to the outside obliquely below the recesses 3a and 3b. 4b are formed, and sealing curtains 5a and 5b are formed at the outer ends of the outlets 4a and 4b so that a large number of cuts are formed. In addition, lever-stopping ribs 6a and 6b are formed in the lower part of the inner surfaces of the recesses 3a and 3b so as to bite horizontally with respect to the outer peripheral recess of the lever b, and the lever is further below the lever-stopping ribs 6a and 6b. Semi-cylindrical portions 7a and 7b and inward edges 8a and 8b surrounding the outer periphery of b are formed.

  Further, a horizontally long flange 9 is provided at a portion corresponding to an upper portion of the recessed portion 3a of one half cover 1a on the lower inner surface of the hinge portion 2 so as to be positioned above an exposed charging portion such as a lever mooring portion. It is formed integrally. Further, a laterally long groove 10 is formed in the upper portion of the recessed portion 3a of the other half-cut cover 1b, and the horizontally long flange 9 is fitted into the horizontally long groove 10 when the half-cut covers 1a and 1b are joined together. To do. By fitting in this way, the flow of rainwater is blocked without causing a gap between the horizontally long flange 9 and the inner surface of the half-cut cover 1b. Both end portions of the horizontally long groove 10 are formed in a downward inclined shape, and both end portions of the horizontally long flange 9 are also formed in a downward inclined shape in the same manner.

  Further, sealing material accommodating portions 11a and 11b are formed on both sides of the recessed portions 3a and 3b. As will be described later, the sealing material accommodating portions 11a and 11b are for accommodating the annular sealing material 12 that is elastically brought into close contact with the periphery of the electric wire d. It is formed by providing the shape portions 14a and 14b with an appropriate interval. The semicircular ridges 13b and 14b on the half cover 1b side are formed slightly outside the semicircular ridges 13a and 14a on the half cover 1a side, respectively, when the half covers 1a and 1b are joined together. The hooks are prevented from colliding with each other. Further, the semicircular bowl-shaped portion 14a is formed so as to be continuous with both end portions of the horizontally long flange 9, so that a drainage groove 15a continuous with the upper surface of the horizontally long flange 9 is formed on the outer side of the semicircular flange-shaped portion 14a. Is done. A drainage groove 15b connected to the horizontally long groove 10 is formed outside the semicircular bowl-shaped portion 14b. The drain grooves 14a and 15b are partially formed in an annular shape so as to bypass the electric wire d. Further, a vertically long flange portion 16a is formed so as to be connected to a lower side (upper side in FIG. 2) of one semicircular bowl-shaped portion 13a of the half-cut cover 1a so as to be positioned on both sides of the recessed portion 3a. When being bonded, the vertically long flange portion 16a is bonded to both inner edges of the recessed portion 3b.

  Moreover, the half-sleeve-shaped wire lead-out portions 17a and 17b from which the wire d is led out are formed on the outer edges of the drain grooves 15a and 15b. The wire lead-out portions 17a and 17b are formed in a bamboo shoot shape so that the inner diameter and the outer diameter gradually become smaller as they approach the tip, and the tip of the wire d is cut by cutting the tip according to the thickness of the wire d. The versatility with respect to the thickness is obtained, and it can be used for several types of electric wires with different diameters.

  Polymerized pieces 18a and 18b are formed below the semicircular bowl-shaped portions 13a and 13b. The polymerized pieces 18a and 18b are connected to the sealing material accommodating portions 11a and 11b and the drainage grooves 15a and 15b. Grooves 19a and 19b are formed. The drain grooves 19a and 19b are open at the lower ends and communicate with the outside of the cover. Further, an engagement protrusion 20a is formed on the overlap piece 18a, and an engagement hole 20b is formed on the overlap piece 18b. Further, the overlapping pieces 21a and 21b are formed on the outer peripheral edges of the lower ends of the half covers 1a and 1b, the engaging protrusions 22a are formed on one overlapping piece 21a, and the engaging holes 22b are formed on the other overlapping piece 21b. Yes. The engaging projections 20a and 22a are formed in a conical shape having a slightly thicker tip. On the other hand, the engagement holes 20b and 22b have a smaller diameter than the conical shape, but have slits formed radially on the outer peripheral portion. For this reason, when the engagement protrusions 20a and 22a are inserted into the engagement holes 20b and 22b, the slits split and elastically return after the inner diameters of the engagement holes 20b and 22b are temporarily expanded. The engagement protrusions 20a and 22a engage with the engagement holes 20b and 22b, and the half-cut covers 1a and 1b are joined together in the closed state as shown in FIGS. Note that edge ribs 23a are formed on both upper edges of one half cover 1a. When both half covers 1a and 1b are joined, the edge ribs 23a are joined to both upper edges of the other half cover 1b. Further, as shown in FIG. 3, plate-like knob portions 24a and 24b are projected from the outer surfaces of the half-cut covers 1a and 1b, and the abutment portions 24a and 24b are sandwiched by a specific tool. The cable cover can be safely installed without fear of electric shock.

  In the overhead wire cover configured as described above, the sealing material accommodating portions 11a and 11b accommodate the elastic semi-annular sealing material 12 such as sponge and the exposed charging of the insulator mooring portion shown in FIG. The half-cut covers 1a and 1b are attached so that the portions are accommodated in the recessed portions 3a and 3b, and the electric wire d is led out from the electric wire lead-out portions 17a and 17b. Further, the discharge terminal f is covered with an insulating synthetic resin cylinder 25, and an elastic sealing material 26 such as a sponge is externally fitted on the outer periphery of the synthetic resin cylinder 25. The discharge terminal f is led out to the outside from the outlets 4a and 4b so that is inside the sealing curtains 5a and 5b. Then, the lever-stopping ribs 6a and 6b are bitten into the outer peripheral recesses of the lever b, the engagement protrusions 20a and 22a are engaged with the engagement holes 20b and 22b, and the sealing material 12 is moved as shown in FIG. The outer periphery of the electric wire d is brought into watertight contact. By joining the half-cut covers 1a and 1b in this manner, the horizontally long flange 9 is fitted into the horizontally long groove 10, and the horizontally long flange portion 9 includes the support fitting c, the sandwiching portion e, and the bare wire portion. It is located above the exposed charging part such as g.

By providing the horizontally long flange portion 9 in this way, even if rainwater enters into the cover from both ends 2a, 2b, etc. of the hinge portion 2, the rainwater is blocked by the horizontally long flange 9 and the horizontally long flange. 9 flows into both ends of the battery, so that rainwater does not flow into exposed charging parts such as the support fitting c, the sandwiching part e, and the bare electric wire part g. Rainwater that has flowed to both ends of the horizontally long flange 9 is discharged out of the cover through the drain grooves 15a and 15b and the drain grooves 19a and 19b. Further, even if rainwater enters the cover through the wire d from the inside of the wire lead-out portions 17a and 17b, the rainwater is discharged out of the cover through the drain grooves 15a and 15b and the drain grooves 19a and 19b. Is done. At that time, even if rainwater penetrates further through the electric wire d, the rainwater is blocked by the sealing material 12, and even if rainwater enters the sealing material accommodating portions 11a and 11b, the rainwater is drained. It is discharged through the grooves 19a and 19b. For this reason, even if the flexibility, elasticity, and the like of the sealing material 12 accommodated in the sealing material accommodating portions 11a and 11b are deteriorated over time, there is no possibility that rainwater enters the exposed charging portion. In addition, even if the cover is temporarily opened for inspection or the like, the waterproofness is maintained without impairing the flexibility and elasticity of the sealing material 12, so that the maintenance is easily performed and the reliability of the waterproofness is also improved. Get higher.
In addition, since the exposed charging part is surrounded by the insulating cover in this manner, it is possible to prevent the wire carried by the birds, the snake climbing the power pole, or the tree approaching the power pole from coming into contact with the exposed charging part. Therefore, it is possible to reliably prevent a short circuit accident using these media.

In addition, although the above embodiment demonstrated the insulator mooring part, this invention is not restricted to the cover attached to an insulator mooring part, As shown in FIG. 8, the connection part which connects an overhead wire linearly, or FIG. As shown, the present invention can also be applied as an overhead wire cover that is attached to a branch connection portion that connects overhead wires in a branch shape.
That is, in the embodiment shown in FIG. 8, the bare wire portion g of the wire d and the bare wire portion g ′ of the wire d ′ are linearly connected by the fasteners h, and the cover is attached to the connecting portion. Is formed integrally with the hinge portion 2 so that the pair of half-cut covers can be opened and closed by an electrically insulating synthetic resin, as in the above-described embodiment, and the bare wire portions g, g ′, fasteners h, etc. A horizontally long flange 9 is provided so as to be positioned above the exposed charging portion, and a receiving portion for containing the sealing material 12 in close contact with the outer periphery of the electric wires d and d ′ is formed on both sides of the exposed charging portion. A drainage groove 15 connected to the upper surface of the horizontally long flange 9 is formed on the outer side, and an electric wire outlet portion 17 is formed on the outer edge of the drainage groove 15. For this reason, rainwater is prevented from dripping onto the exposed charged parts such as the bare electric wire parts g and g ′ and the fastener h, and the rainwater flowing on the horizontally long flange 9 is for drainage located outside the sealing material 12. It is discharged to the outside through the groove 15 and does not accumulate in the cover, and rainwater that enters the cover through the wires d and d ′ is also discharged to the outside through the drainage groove 15.

  In addition, the overhead wire cover shown in FIG. 9 has the bare wire portion g of the wire d, the bare wire portion g ′ of the wire d ′, and the bare wire portion g ″ of the wire d ″ connected by the fastener h. The overhead wire cover is also integrally formed with the hinge portion 2 in between so that the pair of half-cut covers can be opened and closed with an electrically insulating synthetic resin. A horizontally long flange 9 is provided so as to be positioned above the exposed charging portion such as the bare electric wire portions g, g ′, g ″, and the fastener h, and the sealing material is in close contact with the outer periphery of the electric wires d, d ′, d ″. 12 is formed on both sides of the exposed charging portion, a drainage groove 15 is formed on the outer side of the storage portion, and is connected to the upper surface of the horizontally long flange 9. A portion 17 is formed. Therefore, it is possible to prevent rainwater from dripping onto the exposed charged parts such as the bare electric wire parts g, g ′, g ″, the fasteners h, and the like, and the rainwater flowing into the horizontally long flange 9 is placed outside the sealing material 12. The rainwater that is discharged to the outside through the drainage groove 15 that is located and enters the cover through the wires d, d ′, d ″ is also discharged to the outside through the drainage groove 15.

Further, the overhead wire cover according to the present invention can be applied as a cover of a retaining clamp for keeping the wire in the air. That is, as shown in FIG. 10, one end of the retaining clamp n is pulled by a utility pole or the like through the insulator m, and the retained wire n sandwiches the bare wire portions g and g 'of one electric wire d and d'. The cover that is attached to and supported by the retaining clamp n is formed integrally with the hinge portion 2 so that the pair of half-cut covers can be opened and closed by an electrically insulating synthetic resin, as in the above embodiment. A horizontally long flange 9 is provided so as to be positioned above the exposed charging portion such as the bare wire portions g and g 'and the retention clamp n, and accommodates the sealing material 12 that is in close contact with the outer periphery of the wires d and d' and the insulator m A drainage groove 15 connected to the upper surface of the horizontally long flange 9 is formed outside the accommodation part, and an electric wire lead-out part 17 and an insulator lead-out part 17 ′ are formed on the outer edge of the drainage groove 15. Is done. In this overhead wire cover as well, the horizontal flange 9 prevents rainwater from dripping onto the exposed charged parts such as the bare wire portions g and g ′ and the retaining clamp n, and the rainwater flowing into the horizontal flange 9 is sealed. Since it is discharged to the outside through the drainage groove 15 located outside the material 12, it does not accumulate in the cover, and rainwater entering the cover through the wires d and d ′ also passes through the drainage groove 15. It is discharged outside.
A short circuit accident caused by a wire carried by birds can be surely prevented by these overhead wire covers.

b Isolator c Support bracket (exposed charging part)
d, d ', d "Electric wire e Clamping part (exposed charging part)
g, g ′, g ″ Bare wire part (exposed charging part)
h Fastener (exposed charging part)
1a, 1b Half-cut cover 2 Hinge part 3, 3a, 3b Recessed recessed part 9 Flange part 10 Horizontally long groove 11, 11a, 11b Housing part 12 Sealing material 15, 15a, 15b, 19a, 19b Drain groove 17, 17a, 17b Electric wire Derived part

Claims (3)

  A pair of half-cut covers are formed by an electrically insulating synthetic resin so that the pair of half-cut covers can be opened and closed, and a concave recess is formed on the opposing inner surface of the half-cut cover. An overhead electric wire cover for accommodating the exposed charging portion and covering the exposed charging portion with the half cover so that the hinge portion is positioned above the exposed charging portion, and attaching the half cover A horizontally long flange is formed on the lower inner surface of the hinge part so as to be located above the charging part, and a sealing material accommodating part for accommodating a sealing material in close contact with the periphery of the electric wire is formed on both sides of the recessed part, A drainage groove connected to the upper surface of the horizontally long flange is formed outside the sealing material accommodating portion, and a wire lead-out portion from which the wire is led out is formed at an outer edge of the drainage groove. cover.   2. The overhead electric wire according to claim 1, wherein the horizontally long flange is integrally formed on the inner surface of one half-cut cover, and a horizontally long groove is formed on the inner surface of the other half-cut cover to fit the horizontally long flange. cover.   3. The overhead wire cover according to claim 1, wherein a portion of the drainage groove connected to the upper surface of the horizontally long flange is formed in an annular shape so as to bypass the wire outside the sealing material housing portion. .

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