JP6455248B2 - Branching method between spans - Google Patents

Description

  The present invention relates to an intermediate span branching method for an overhead distribution line.

  When a distribution line (trunk) spanned between spans such as between utility poles is branched from the middle of the span, a separate messenger wire is spanned, and a spacer made of an insulator is attached to this messenger wire, and the spacer is retained. An electric wire (branch line) branched using a grip or the like was fixed. The branch line was fixed to the branch polymer spacer using a retaining grip or the like.

  As a related technique, for example, there has been a technique related to a support tool that supports each branch line that is attached to at least the outermost distribution line and is branched from each distribution line at the same height as each distribution line. (For example, refer to Patent Document 1 below.)

JP 2010-268637 A

  As for facilities that branch off in the middle of spans, the facility methods have been established such as the conditions for branch line facilities and restrictions on spans. For example, the road conditions, the frontage of houses, the requests of local residents in the field, etc. Depending on the situation, it may be difficult to establish facilities according to construction standards. On the other hand, even if it is difficult to install facilities according to the construction standards, there are cases in which branching between spans must be performed.

  However, since the conventional technology described above cannot be installed in accordance with the construction standards and the swing width of the branch line becomes large, the branch line is likely to break at the end of the contact position between the retaining grip and the branch line. There was a problem that. In addition, when the branch line is disconnected, there is no extra length, so another wire must be connected to the disconnected part, increasing the burden on the recovery work and taking time for the recovery work. There was a problem that would become longer.

  As a countermeasure for this, for example, it is conceivable that an electric wire having a diameter larger than that required for power transmission is used to make it difficult to disconnect, but in this case, an electric wire having an unnecessary large diameter is used for power transmission. There was a problem that the cost for the branching operation increased. In addition, since the weight of the electric wire increases as the diameter increases, in the method of making it difficult to disconnect by using an electric wire having a diameter larger than that required for power transmission, the diameter of the electric wire is increased by using an electric wire having an unnecessary diameter for power transmission. There was a problem that the burden on the operator for the midway branching work increased.

  In order to eliminate the problems caused by the prior art described above, the present invention reliably performs mid-distance branching even at a site where it is difficult to satisfy the construction standards, and suppresses power failure of the distribution path branched by the branch line. It is an object of the present invention to provide a method for branching between spans.

  In order to solve the above-described problems and achieve the object, a span intermediate span branch method according to the present invention is a span mid span span method of an overhead distribution line, and a branch line branched from a branch source trunk line is used as a spacer. The main line that is a branch destination is connected on the trunk line side with respect to the position where the branch line is locked to the spacer, the branch line is cut at a position farther from the trunk line than the locking position, and the branch The branch line and the main line are fixed by using a binding member on the cut position side of the branch line from the connection position between the line and the main line.

  In the above-described invention, the inter-spanning method according to the present invention is characterized in that the binding member has a strength lower than that of the main line.

  In the above-described invention, the inter-spanning branch method according to the present invention is characterized in that the branch line and the main line are fixed using a binding member on the cutting position side of the locking position.

  According to the inter-span branching method according to the present invention, it is possible to reliably perform the inter-span branching even in a site where it is difficult to satisfy the construction standards, and to suppress a power failure in the distribution path branched by the branch line. There is an effect.

It is explanatory drawing (the 1) which shows the spanning work between spans of an overhead distribution line by the branch method of the overhead distribution line of embodiment concerning this invention. It is explanatory drawing (the 2) which shows the spanning work between spans of an aerial distribution line by the aerial distribution line branching method of embodiment concerning this invention. It is explanatory drawing (the 3) which shows the spanning operation | work in the middle of the span of an overhead distribution wire by the branch method of the overhead distribution wire of embodiment concerning this invention. It is explanatory drawing (the 4) which shows the spanning work between spans of an overhead distribution line by the branch method of the overhead distribution line of embodiment concerning this invention. It is explanatory drawing (the 5) which shows the span intermediate | middle branching operation | work of the overhead distribution wire by the branch method of the overhead distribution wire of embodiment concerning this invention. It is explanatory drawing which shows the support state of the branch line with respect to the polymer spacer for a branch by the conventional halfway span method. It is explanatory drawing which shows the support state of the branch line with respect to the polymer spacer for branching by the span intermediate way branching method of embodiment concerning this invention.

  DETAILED DESCRIPTION Exemplary embodiments of an intermediate span branching operation for an overhead distribution line according to the present invention will now be described in detail with reference to the accompanying drawings.

(Branch way between spans of overhead distribution lines)
A method of branching between spans of an aerial distribution line according to an embodiment of the present invention will be described.

  1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5 are explanatory views showing intermediate span branching work of an overhead distribution line by the span intermediate branch method according to the embodiment of the present invention. The intermediate branching work of the overhead distribution line is a work in which the high-voltage support metal or high-pressure horizontal branching polymer spacer is fixed in the middle of the span with a messenger wire, and the wire is directly branched from the middle of the span. In the embodiment, an example using a polymer spacer for high-pressure horizontal intermediate branching (hereinafter referred to as “branching polymer spacer”) will be described. Further, in this embodiment, a description will be given of an inter-spanning work between spans of an aerial distribution line in an area excluding a strong wind area, a heavy snow damage countermeasure area and a salt damage countermeasure area.

  Below, the aerial distribution line branched by the intermediate span branch method according to the embodiment of the present invention will be described together with general construction standards. In FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5, it is explanatory drawing which shows the aerial distribution line which branches by the span intermediate way branch method of embodiment concerning this invention. Specifically, FIG. 1 shows the vicinity of a branching position in an aerial distribution line that branches by the intermediate span branching method according to the embodiment of the present invention. 2, 3 and 4, one phase of the three-phase overhead distribution line shown in FIG. 1 is extracted and shown.

  1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5, reference numerals 101 and 102 denote electric poles on which an electric wire (main line) 103 as a branching source is installed. The distance between the utility pole 101 and the utility pole 102 on which the trunk line 103 is installed is set to a predetermined distance (for example, 40 m) or less (see FIG. 2). The trunk line 103 includes, for example, a cable main body formed of a conductor and an insulating coating that covers the cable main body.

  The trunk line 103 is installed between the utility pole 101 and the utility pole 102 along the horizontal direction. When branching between the spans of the overhead distribution lines, first, a branching polymer spacer 104 is attached between the utility pole 101 and the utility pole 102. The branching polymer spacer 104 is installed between the utility pole 101 and the utility pole 102 between the utility pole 101 and the utility pole 102, and supports the electric wire (branch line) 105 branched from the trunk line 103. Hereinafter, an electric wire branched from the main line 103 and between the branch position from the main line 103 and the branch pillar 106 will be described as a branch line 105.

  FIG. 5 shows the branching polymer spacer 104 and its vicinity. The branching polymer spacer 104 has a long bar shape, and includes gripping fittings attached to both ends in the length direction. The branching polymer spacer 104 is mainly formed of an insulator such as FRP.

  When attaching the branching polymer spacer 104, one end of the messenger wire 107 is attached to the holding fitting 501 at both ends of the branching polymer spacer 104, and the other end of each messenger wire 107 is fixed to the utility pole 101 and the utility pole 102, respectively. . Thereby, the branching polymer spacer 104 can be attached between the utility pole 101 and the utility pole 102. The branching polymer spacer 104 and each messenger wire 107 are attached to the trunk line 103 in a state where a predetermined separation distance (for example, 1.2 m) is secured (see FIG. 3).

  Specifically, each messenger wire 107 is separated from the utility pole 101 or the utility pole 102 by a predetermined separation distance (for example, 1....) From the high-voltage wire arm located above the messenger wire 107 in the utility pole 101 and the utility pole 102. 2m), the separation distance between the high-voltage line located above the messenger wire 107 and the branching polymer spacer 104 and the messenger wire 107 is a predetermined separation distance (for example, 1.. Attach it to a position where it can be kept at about 2m).

  The messenger wire 107 is made of galvanized steel, for example. When the trunk line 103 is damaged due to an accident or the like, electricity may flow through the messenger wire 107 that supports the branching polymer spacer 104. As described above, since the branching polymer spacer 104 is mainly formed of an insulator, the holding metal fittings 501 at both ends of the branching polymer spacer 104 are not electrically connected. For this reason, the messenger wires 107 attached to each of the holding fittings 501 are grounded.

  Each of the holding metal fittings 501 at both ends of the branching polymer spacer 104 is provided with a branch line 503 via a torsion strap 502. The branch line 503 is attached to the holding metal fittings 501 at both ends of the branching polymer spacer 104 via the ball wheel 504 and both ends thereof via the torsion strap 502. The ball insulator 504 is pulled toward the branch column 106 by a branch line 505 fixed to the branch column 106. The length of the branch line 505 (the length from the ball wheel 504 to the branch pillar 106) is set to a predetermined length (for example, 30 m) or less. In addition, the distance (outward width) from the ball wheel 504 to the main line 103 is set to a predetermined distance (for example, 2 m) or less.

  The branch column 106 is retained by the branch line 401 so as to be urged to the opposite side to the tension applied to the branch column 106 by the electric wire branched from the main line 103. Thereby, balance of tension can be aimed at. If the branch column 106 can be installed, it is preferable to further install a horizontal branch line attached to the branch column 106 from the side opposite to the branch line 401. The utility pole 101 and the utility pole 102 are provided with branch lines 101a and 102a for holding the utility pole 101 and the utility pole 102 against the tension caused by pulling the branch line 503 by the branch line 505, respectively.

  Next, the branch line 105 is branched from the trunk line 103. The branch line 105 includes, for example, a cable main body formed of a conductor and an insulating coating that covers the cable main body. In branching the branch line 105 from the main line 103, first, the insulation coating at the branch position of the main line 103 is removed to expose the conductor of the main line 103. Further, the insulation coating at the tip position of the branch line 105 connected to the trunk line 103 is peeled off to expose the conductor of the branch line 105. Next, the exposed conductor of the trunk line 103 and the conductor of the branch line 105 are pressure-bonded via a connector. The branch line 105 can be branched from the main line 103 by crimping the conductor of the main line 103 and the conductor of the branch line 105.

  FIG. 6 is an explanatory view showing a support state of the branch line 105 with respect to the branching polymer spacer 104 by a conventional intermediate span branching method. In FIG. 6, in the conventional branching method between spans, the branch wire 105 is attached to the branch polymer spacer 104, and the position of the branch line 105 relative to the branch polymer spacer 104 is fixed using the aluminum insulated wire retaining grip 601. The branch line 105 branched from the trunk line 103 is fixed to the branch polymer spacer 104 by an aluminum insulated wire retaining grip 601 and is routed to the branch pillar 106 on the way.

  As described above, regarding the branching between spans, the facility method is defined such as the conditions concerning the facility of the branch line 401 and the limitations on spans. For example, the road conditions, the frontage of the house, the local residents in the field Depending on the situation of the request, it may be difficult to install the facility according to the construction standards. Specifically, for example, the branch pole 106 cannot be built according to the construction standard, and the distance between the branched portion and the first pillar of the branch pillar 106 is longer than the construction standard. The case where it ends. Moreover, for example, the case where the span between the utility pole 101 and the utility pole 102 becomes longer than the construction standard can be cited.

  On the other hand, even if it is difficult to install facilities according to the construction standards, there are cases in which branching between spans must be performed. For this reason, for example, when the distance from the branching point of the branch line 105 to the first column of the branch pillar 106 is longer than the construction standard, the swinging width of the branch line 105 is increased. In this case, disconnection is likely to occur at the end of the contact position between the aluminum insulated wire retaining grip 601 and the branch line 105.

  Further, for example, when the span between the utility pole 101 and the utility pole 102 becomes longer than the construction standard, the swing width of the main line 103 is increased, and therefore the branch line 105 is greatly swung due to the swing of the main line 103. Move. Also in this case, it becomes easy to break at the end of the contact position between the aluminum insulated wire retaining grip 601 and the branch line 105. If it is disconnected, there is no extra length, so the burden on the restoration work is large, and the time for the restoration work is long, and the power outage time becomes long.

  As a countermeasure against this, when disconnection is prevented by using an electric wire having a diameter larger than that required for power transmission, the cost required for branching in the middle of the span increases by using an electric wire having a large diameter unnecessary for power transmission. In addition, since the weight of the electric wire increases as the diameter increases, the use of an electric wire with a large diameter that is unnecessary for power transmission increases the burden on the operator for the inter-span branching operation.

  On the other hand, the intermediate span branching method according to the embodiment of the present invention supports the branch line 105 with respect to the branching polymer spacer 104 as follows. FIG. 7 is an explanatory view showing a support state of the branch line 105 with respect to the branching polymer spacer 104 by the intermediate span branching method according to the embodiment of the present invention. In FIG. 7, the method of branching between spans according to the embodiment of the present invention is a branch line in which the position with respect to the branch polymer spacer 104 is fixed by using the aluminum insulated wire retaining grip 601 attached to the branch polymer spacer 104. 105 is cut on the branching column 106 side with respect to the branching polymer spacer 104. The end portion of the cut branch line 105 is subjected to insulation treatment using a terminal cap 701 formed using an insulating material.

  Then, another electric wire (hereinafter referred to as “main line”) 702 is connected on the main line 103 side with respect to the branching polymer spacer 104 in the branch line 105. The main line 702 includes, for example, a cable main body formed of a conductor and an insulating coating that covers the cable main body.

  The branch line 105 and the main line 702 are connected using a branch sleeve 703. Specifically, first, the insulation coating on the side of the trunk line 103 from the branching polymer spacer 104 in the branch line 105 is peeled off to expose the conductor of the branch line 105. Further, the insulation coating at the tip position of the main line 702 connected to the branch line 105 is peeled off to expose the conductor of the main line 702. Next, the exposed conductor of the branch line 105 and the conductor of the main line 702 are pressure-bonded via the branch sleeve 703. The main line 702 can be connected to the branch line 105 by crimping the conductor of the branch line 105 and the conductor of the main line 702. The other end of the main line 702 whose one end is connected to the branch line 105 is routed to the branch column 106.

  Further, in the vicinity of the branch sleeve 703 and closer to the branch column 106 than the branch sleeve 703, a branch line 105 to which an aluminum insulated wire retaining grip 601 is attached, a main line 702 having one end connected to the branch line 105, Is fixed using the first bind 704. As the first bind 704, various known binds can be used.

  Further, on the branch column 106 side of the first bind 704, the branch line 105 to which the aluminum insulated wire retaining grip 601 is attached and the main line 702 having one end connected to the branch line 105 are connected to the second bind 705. Use to fix. The strength of the second binding 705 is preferably lower than the strength of the main line 702. The strength of the second binding 705 is adjusted to be lower than the strength of the main line 702 by appropriately selecting, for example, the thickness of the second binding 705 and the material forming the second binding 705. Can do. As the second bind 705, various known binds can be used.

  As described above, in the embodiment according to the present invention, the branch line 105 is cut halfway without being routed to the branch pillar 106, and the main line 702 is connected to the branch line 105 using the branch sleeve 703. The main line 702 is routed around the branch pole 106, and the branch line 105 and the main line 702 are fixed by the first bind 704 and the second bind 705.

  As a result, when the branch line 105 and the main line 702 from the branch position with the main line 103 to the branch pillar 106 are swung due to the influence of wind or the like, the burden caused by this swing is between the main line 702 and the second bind 705. Concentrate on the contact position. By making the strength of the second bind 705 lower than the strength of the main line 702, if a load due to swinging is applied to the contact position between the main line 702 and the second bind 705, the first bind 705 is preceded by the first line 702. The second bind 705 is disconnected (broken). Thus, according to the span intermediate way branching method of the embodiment according to the present invention, disconnection of the main line 702 can be suppressed.

  As a result, it is possible to reliably carry out branching between spans even at a site where it is difficult to satisfy the construction standards, and to suppress a power failure in the power distribution path branched by the branch line 105. Further, in a state where the second bind 705 is disconnected, it can be easily repaired only by constructing the second bind 705 again, and the work load for repairing the branch path can be reduced.

  In addition, when the second bind 705 is disconnected, the distance between the end of the cut branch line 105 and the main line 702 is increased. Therefore, it is confirmed that the second bind 705 is disconnected even from a distant place such as the ground. This makes it easier to detect the disconnection of the second bind 705 at an early stage. Since the connection position between the branch line 105 and the main line 702 is protected by the first bind 704 in addition to the second bind 705, even if the second bind 705 is disconnected, the branch line 105 and the main line are connected. The connection with 702 does not break immediately.

  Further, since it is mainly the main line 702 that is burdened by the swing, the connection between the branch line 105 and the main line 702 is assumed to be disconnected before the branch line 105 at the end of the compression sleeve. The Since the branch line 105 and the main line 702 overlap from the compression sleeve to the end of the branch line 105, if the connection between the branch line 105 and the main line 702 is broken, the overlap at the branch line 105 It is possible to renovate using the part. Thereby, compared with the case where there is no surplus length and repair is performed by adding electric wires, the work load required for restoration can be suppressed, and repair can be performed early.

  Moreover, since the electric wire of a diameter required for the original power transmission can be used, it is possible to reduce the burden on the operator involved in the intermediate span branch work and to reduce the cost of the intermediate span branch work.

  As described above, the method of branching between spans of an overhead distribution line according to an embodiment of the present invention locks a branch line 105 branched from a branch source trunk line to a spacer, and relates the branch line 105 to the spacer. The branch main line 702 is connected on the main line side from the stop position, the branch line 105 is cut at a position farther from the main line than the locking position, and the branch line 105 is connected to the branch line 105 from the connection position of the main line 702. It is characterized in that the branch line 105 and the main line 702 are fixed using a binding member on the cutting position side.

  According to the method for branching between spans of an aerial distribution line according to the embodiment of the present invention, the branching between spans is reliably performed even at a site where it is difficult to satisfy the construction standards, and the branching is performed by the branch line 105. Can suppress power outage on the route

  Further, the method of branching between spans of an overhead distribution line according to the embodiment of the present invention is characterized in that the binding member has a strength lower than that of the main line 702.

  According to the method of branching between spans of an overhead distribution line according to the embodiment of the present invention, when the main line 702 swings, the second bind 705 is disconnected (broken) before the main line 702. And the part where the second binding 705 is broken (broken) is inferred that the gap between the main line 702 and the branch line 105 is widened, the appearance is not good, and it is conspicuous compared to the part where the work is normally performed. Is done.

  Accordingly, it is possible to notify the operator at an early stage that the second bind 705 is disconnected (broken) during an inspection operation or the like. Then, it is possible to suppress the disconnection of the main line 702 by informing at an early stage that the second bind 705 has been disconnected (broken).

  As described above, the intermediate span branch method according to the present invention is useful for the intermediate span branch method of an overhead distribution line, and in particular, the intermediate span branch method of branching an overhead distribution line using a branch polymer spacer. Suitable for

101, 102 Utility pole 103 Trunk line 104 Branch polymer spacer 105 Branch line 106 Branch pillar 702 Main line

Claims (3)

A method of branching between spans of overhead distribution lines,
The branch line branched from the main trunk line is locked to the spacer,
Connect the main line of the branch destination on the trunk line side than the locking position of the branch line with respect to the spacer,
Cutting the branch line at a position farther from the main line than the locking position;
Fixing the branch line and the main line using a binding member on the cutting line side of the branch line from the connection position of the branch line and the main line,
A method of branching between spans characterized by that.   The method according to claim 1, wherein the binding member has a strength lower than that of the main line.   3. The intermediate span branching method according to claim 1, wherein the branch line and the main line are fixed using a binding member on the cutting position side of the locking position.

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