JPH0819149A - Distribution transformer primary cable wiring method - Google Patents

Abstract

(57) [Summary] [Purpose] Not only to improve the appearance of the environment and prevent the occurrence of bird damage, but also to improve the workability at the time of inspection and repair, as well as to improve the durability of relay equipment. [Structure] A housing cylinder 3 is installed on an upper end of a utility pole 1, and a cutout 2 is housed in the cylinder 3. A cylindrical transformer 4 is installed on the upper end of the housing cylinder 3 so as to form one pillar together with the utility pole 1 and the housing cylinder 3. The support insulator 10 supporting the distribution line 11 is supported by the arm 5 that is branched and attached to the utility pole 1, and the distribution line 11 is spaced a predetermined distance from the cutout 2 on the utility pole 1 and the transformer 4. And separate. A high voltage pull-down wire 13 that connects the support insulator 10 and the cutout 2 is drawn into the housing cylinder 3 through the arm 5 and the electric pole 1, and the cutout 2 and the transformer 4 are connected.
And are connected to each other by a relay wire 14 in the housing cylinder 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution transformer primary cable wiring system for arranging a branch line from an overhead distribution line in a utility pole and connecting it to a transformer.

[0002]

2. Description of the Related Art Generally, a wire arm is attached to an electric pole so as to extend in a horizontal direction, and a support insulator for supporting a distribution line is erected on the wire arm. A transformer is attached to the side of the electric pole, and a cutout as a relay device for protecting the transformer is attached on the armband. Then, a down wire as a primary side cable is connected to the support insulator, the distribution line is branched through the support insulator, and the down wire is connected to the transformer through the cutout. ing.

[0003]

However, in the above-mentioned conventional technique, the transformer and the cutout are installed so as to project laterally from the utility pole and are exposed to the outside, and connect them to the support insulator. The down line is also exposed to the outside. For this reason, there is a problem that the appearance of the electric pole is cluttered and the appearance of the environment cannot be improved. There is also a problem that bird damage is likely to occur, such as bird nests and ground faults. In addition, due to the fact that transformers and cutouts are placed relatively close to the distribution line, it is not possible to secure a sufficient working space on the utility pole, making inspection and repair work of these devices complicated. There was also a problem that it became difficult and the workability deteriorated. Moreover, there is a possibility that cutouts and pull-down wires exposed to the outside may be contaminated, their insulation performance may be deteriorated, and durability may be reduced.

The present invention has been made to solve the above problems. Its purpose is not only to improve the appearance of the environment but also to prevent the occurrence of bird damage, and not only to improve workability during inspections and repairs, but also to improve the durability of relay equipment. It is to provide a wiring method of a distribution transformer primary cable capable of improving the power distribution.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, in the invention according to claim 1, a transformer is provided on a pillar provided with a branch arm, and the transformer is protected in the pillar. The branch arm for accommodating a relay device for supporting the overhead distribution line is provided in the branch arm, and a cable connected to the terminal insulator and branching the distribution line is passed through the branch arm and placed in the strut. A cable is connected between the distribution line, the relay device, and the transformer by a cable within the support.

According to a second aspect of the present invention, the transformer is arranged on a cylindrical column and closes an upper end opening of the column. According to the third aspect of the invention, the support is provided with an opening / closing part at a position corresponding to the accommodation place of the relay device.

[0007]

Therefore, according to the first aspect of the invention, the transformer is provided on the pillar and does not project to the side of the pillar, and the relay device is provided inside the pillar and is not exposed to the outside. Further, since the terminal insulator is provided on the branch arm, the distribution line supported by the terminal insulator is separated from the transformer or the relay device provided on the support side at a predetermined interval. Further, the cable connected to the terminal insulator is arranged in the branch arm and the column, and is not exposed to the outside. As a result, the external appearance of the columns is very clean, inspection work and the like are facilitated, and the relay devices and cables are prevented from being damaged, and the insulation of the power distribution path is stable.

According to the second aspect of the present invention, with the installation of the transformer, the relay device and the cable in the support are completely shielded from the outside, and the contamination of them is reliably prevented. According to the invention described in claim 3, by opening the opening / closing portion, the wiring work of the cable, the inspection work of the relay device, etc. can be easily performed without any trouble.

[0009]

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1, 2 and 5, a utility pole 1 is formed of a steel material having a cylindrical shape with a lid, and a plurality of relay equipments (three in this embodiment) are provided on the upper end surface thereof.
The cylindrical accommodating cylinder 3 having the cutout 2 therein is fixedly attached. In this embodiment, the utility pole 1 and the housing cylinder 3 constitute a support. The cylindrical transformer 4 is installed at the upper end of the housing cylinder 3, and the electric pole 1 and the housing cylinder 3 are provided.
Together with it, it forms one pillar. Further, the transformer 4 closes the upper end opening of the housing cylinder 3, and with this configuration, the cutout 2 is sealed in the housing cylinder 3 and cuts off communication with the outside. .

The arm 5 as a branch arm is formed of a cylindrical steel material, and its base end is inserted into a through hole 6 formed in the peripheral surface of the upper end of the electric pole 1. A mounting portion 7 is formed on the peripheral portion of the through hole 6, and the arm 5 is attached to the utility pole 1 by the mounting portion 7.
Is detachably fixed by a bolt 8 and a nut 9. The arm 5 extends in the horizontal direction from the fixed portion with respect to the electric pole 1, and is bent at a right angle so that its tip end side extends upward, thereby forming an L-shape as a whole. That is, the vertical portion extending upward of the arm 5 includes the housing cylinder 3 and the transformer 4 on the utility pole 1.
And are arranged substantially parallel to each other at a predetermined interval.

A plurality of terminal insulators (three in this embodiment)
The supporting insulator 10) is attached to the circumferential surface of the vertical portion of the arm 5 so as to be arranged along the longitudinal direction thereof and projects in the horizontal direction. Then, the three-phase distribution lines 11 arranged in a vertical manner are supported at the tips of the supporting insulators 10, respectively. In addition, in the armor 5, each support insulator 1
At the base end of 0, a high-voltage pull-down wire 13 is provided via an adapter 12.
Are connected to each other, and the line of the distribution line 11 is branched via these supporting insulators 10. Each high-voltage pull-down wire 13 as a branch line passes through the arm 5 and is drawn into the housing cylinder 3 through the utility pole 1, and the other ends thereof are cut in the housing cylinder 3, respectively. Connected to the bottom of Out 2. Further, one end of each relay wire 14 is connected to the upper portion of each cutout 2, and the other end of each relay wire 14 is connected to the transformer 4 in the housing cylinder 3.
Is attached to the underside of. In the present embodiment, the high voltage pull-down wire 13 and the relay wire 14 constitute a primary side cable. Reference numeral 5a denotes a conical cap fitting attached to the upper end of the arm 5 and a ground wire 15 for preventing lightning strikes the distribution line 11 is supported at the tip of the cap fitting 5a.

First, the support insulator 10 and its peripheral structure will be described. As shown in FIG. 3, the insulator main body 16 of the support insulator 10 has a through-hole 16a, and a supporting metal fitting 17 is fixed to the outer periphery of the tip end portion thereof, and a base metal fitting 18 is fixed to the outer periphery of the base end portion thereof. Has been done. The supporting insulator 10 is detachably fixed to the arm 5 with its base metal fitting 18 by bolts 25 and nuts 26. The wire support electrode 19 has bolts 2 on the support fitting 17.
It is tightened and fixed by 0, and the tip side opening of the through-hole 16a is closed. The fixed electrode 21 is screwed and fixed to the electric wire supporting electrode 19, and the tip side thereof serves as a pin terminal 21a located in the through hole 16a.

A wire groove 19a is formed in the wire supporting electrode 19, and the distribution line 11 is attached to the wire groove 19a. A pair of bolts 22 are fixed to the wire supporting electrode 19, and the wire holding metal fitting 24 is attached to the wire supporting electrode 19 by the bolt 22 and a nut 23 screwed to the bolt 22. Then, by tightening the nut 23, the distribution line 11 is clamped and fixed between the wire groove 19 a of the wire support electrode 19 and the wire holding metal fitting 24. The insulating cover 27 is arranged so as to cover the support fitting 17, the wire support electrode 19, and the wire holding fitting 24.

The mold cone 28 has a pair of electrodes 29, 3 having insertion holes 29a, 30a at both ends thereof.
0, and an intermediate portion thereof is a taper portion 31 formed by molding epoxy resin or the like. The electrodes 2 at both ends
9 and 30 are electrically connected to each other in the tapered portion 31. A flange 32 made of a metal plate is attached to the base end of the tapered portion 31.

Then, the taper portion 31 of the mold cone 28 is inserted into the through hole 16a of the insulator body 16 from the base metal fitting 18 side. Then, the mold cone 28
The pin terminal 21a of the fixed electrode 21 is fitted in the insertion hole 29a of the electrode 29 on the tip end side of the electrode 29 to electrically connect the two 29, 21. When mounting the mold cone 28, a fluid insulator 33 such as silicon grease is injected and filled into the gap between the mold cone 28 and the through hole 16a. Further, the mold cone 28 is inserted to a position where the flange 32 thereof comes into contact with the annular body 34 arranged so as to be in close contact with the end surface of the insulator body 16. In this state, the pressing plate 35 is fastened and fixed to the base metal fitting 18 with the bolts 36, whereby the flange 32 is sandwiched and fixed between the pressing plate 35 and the annular body 34.

The adapter 12 includes an electrode fitting 37 having a pin terminal 38, one end of the high-voltage pull-down wire 13 having the core wire 13a fitted to the electrode fitting 37, and an elastic material such as EP rubber. It is covered with a protective layer 39 formed and formed into a substantially L shape. The protective layer 39 includes the inner semiconductive layer 39a, the insulating layer 39b, and the outer semiconductive layer 3.
It has a three-layer structure of 9c. Further, the adapter 12 is formed with an engagement hole 12a capable of engaging the electrode 30 on the base end side of the mold cone 28, and the pin terminal 38 projects from the inner bottom portion of the engagement hole 12a. Then, when the electrode 30 of the mold cone 28 is fitted into the engaging hole 12a of the adapter 12, the pin terminal 38 on the adapter 12 side is moved to the electrode 3
It is fitted into the insertion hole 30a of 0, and both 38 and 30 are electrically connected.

Next, the cutout 2 and its peripheral structure will be described. As shown in FIGS. 2 and 4 to 6,
The mounting plate 41 is welded and fixed in the housing cylinder 3 and extends along the axial direction of the cylinder 3. The main body case 43 of the three cutouts 2 is formed into a substantially cylindrical shape with a lid by molding an epoxy resin or the like, and a current limiting fuse 44 is housed inside the case 43 in a removable manner. The lid 45 is detachably attached to the opening edge so as to cover the opening of the main body case 43. A flange 46 is integrally formed on the outer circumference of the body case 43.

Then, with the body case 43 inserted through the three insertion holes 41a formed in the mounting plate 41, the flange 46 is tightened and fixed to the mounting plate 41 by the bolts 47 and nuts 48, so that three The cutout 2 is removably attached to the attachment plate 41.
The cutouts 2 are arranged vertically in the housing cylinder 3 with a slight offset in the left-right direction in FIG. 5 and are inclined at a predetermined angle with respect to a plane orthogonal to the mounting plate 41. It is installed.

As shown in FIG. 4, a pair of upper and lower mold cones 49 are attached to the upper and lower surfaces of the ends of the cutout 2, respectively. These mold cones 49 are
A protective layer 5 formed by molding a substantially cone-shaped mold cone body 50 made of epoxy resin or the like with EP rubber or the like.
It is formed by coating with 1. The protective layer 5
1 is composed of an insulating layer 51a and an outer semiconductive layer 51b. The pin terminal 52 is provided so as to project from the tip of each mold cone body 50, and the lead wires 54A and 54B and the electrode plates 53A and 53B provided in the cutout 2 are provided.
And the like through the contactors 44a, 44 of the current limiting fuse 44.
It is electrically connected to each of b. Also, the mold cone 49
The engaging hole 49a is formed at the tip of the
The pin terminal 52 projects from the inner bottom portion of a.

The adapter 56 includes an electrode fitting 57 having an insertion hole 57a at one end, and the other end of the high-voltage pull-down wire 13 having the core wire 13a fitted to the other end of the electrode fitting 57, made of EP rubber or the like. It is formed by covering with a protective layer 58 formed by molding. The protective layer 58 includes the inner semiconductive layer 58a, the insulating layer 58b, and the outer semiconductive layer 58.
It has a three-layer structure of c. In addition, the adapter 56 has an end portion on the insertion hole 57a side of the electrode fitting 57 formed to have a small diameter to form an engagement portion 56a. Then, when the engaging portion 56a of the adapter 56 is fitted into the engaging hole 49a provided in the mold cone 49 on the lower surface side of the cutout 2, the pin terminal 52 is fitted into the inserting hole 57a of the electrode fitting 57. , 57 and 52 are electrically connected.

The connector 59 has three insertion holes 60a,
An electrode fitting 60 having 60b and 60c is covered with a protective layer 61 formed by molding EP rubber or the like to form a substantially T-shape. The protective layer 61 is the inner semiconductive layer 6
It has a three-layer structure of 1a, an insulating layer 61b, and an outer semiconductive layer 61c. Also, the connector 59 has upper and lower insertion holes 60a, 60b side end portions formed with a small diameter to form upper and lower engagement portions 59a, 59b, respectively.
Further, a tapered engagement hole 59c is formed at an end portion of the connector 59 on the side of the side insertion hole 60c.
c is located at the inner bottom of the engagement hole 59c. Then, when the lower engagement portion 59b of the connector 59 is fitted into the engagement hole 49a provided in the mold cone 49 on the upper surface side of the cutout 2, the pin terminal 52 is fitted into the lower insertion hole 60b of the electrode fitting 60. Both are inserted 60,52
Are electrically connected.

The lightning arrester 62 is an insulating rod 6 made of FRP.
3, the cylindrical lightning protection element 64 is inserted and
Is covered with a protective layer 65 formed by molding EP rubber or the like. The lightning protection device 64 is made of zinc oxide as a main raw material and has a non-linear voltage-current characteristic. The protective layer 65 is composed of an insulating layer 65a and an external semiconductive layer 65b. Further, electrode fittings 66 and 67 are fixed to both ends of the insulating rod 63, and a pin terminal 66a is formed on one of the electrode fittings 66. Further, the end portion of the lightning arrester 62 on the pin terminal 66a side is formed in a tapered shape so as to be an engaging portion 62a which can be engaged with the engaging hole 59c of the connector 59. When the engaging portion 62a of the lightning arrester 62 is fitted into the engaging hole 59c of the connector 59, the pin terminal 66a of the electrode fitting 66 on the lightning arrester 62 side is inserted into the side insertion hole 60c of the electrode fitting 60 on the connector 59 side. And 66 and 60 are electrically connected to each other. The other electrode fitting 67 of the lightning arrester 62 is grounded via a lead wire 68 that passes through the housing cylinder 3 and the utility pole 1.

The adapter 69 includes an electrode fitting 70 having a pin terminal 70a at one end and an end portion of the relay wire 14 having the core wire 14a fitted to the other end of the electrode fitting 70.
It is formed by covering with a protective layer 71 formed by molding rubber or the like. The protective layer 71 has a three-layer structure including an inner semiconductive layer 71a, an insulating layer 71b, and an outer semiconductive layer 71c. Further, the adapter 69 is formed with an engaging hole 69a capable of engaging with the upper engaging portion 59a of the connector 59, and the pin terminal 7 is formed from the inner bottom portion of the engaging hole 69a.
0a is protruding. Then, the engaging hole 6 of the adapter 69
When the upper engagement portion 59a of the connector 59 is fitted into the connector 9a, the pin terminal 70a of the electrode fitting 70 on the adapter 69 side
Is the upper insertion hole 60 of the electrode fitting 60 on the connector 59 side.
It is fitted in a and both 70 and 60 are electrically connected.

Further, as shown in FIGS. 2 and 5, adapters 72 having substantially the same structure as the adapter 69 are attached to the other end of each of the relay wires 14, and the adapters 72 are attached to the lower surface of the transformer 4. Is electrically connected to each of the three primary side bushings 73 arranged at. Further, a plurality of secondary side bushings 74 are arranged on the lower surface of the transformer 4, and a low voltage pull-down wire 75 as a secondary side cable is electrically connected to each of the secondary side bushings 74 with an adapter 76 at its end. It is connected to the. As shown in FIG. 6, the low pressure pull-down wires 75 are arranged in parallel with the high pressure pull-down wire 13 and the relay wire 14 in the housing cylinder 3 and pass on both sides of the wires 13 and 14. Is pulled into the telephone pole 1. After that, the low voltage pull-down wire 75 is extended to the outside of the electric pole 1 and drawn into the customer side.

As shown in FIGS. 1, 2 and 6, the housing cylinder 3 is provided with two opening / closing doors 77, 78 as opening / closing portions so as to be opened / closed. One opening / closing door 77 is arranged corresponding to the front surface of each cutout 2, and the other opening / closing door 78 is arranged corresponding to the back surface of each cutout 2. Then, by opening the opening / closing doors 77 and 78, inspection work and repair work of the cutout 2 and its peripheral parts provided in the housing cylinder 3 and the mounting plate 41 are performed.
It is possible to attach and detach the cutout 2 to and from For example, by opening one opening / closing door 77,
The lid 45 of the cutout 2 can be removed to replace the current limiting fuse 44 inside the lid 45. Further, by opening the other opening / closing door 78, the work of attaching / detaching the high voltage down line 13 and the relay line 14 to / from the cutout 2, the work of attaching / detaching the lightning arrester 62, and the relay line 1 to the transformer 4 are performed.
4 and low-voltage pull-down wire 75 can be attached and detached.

Now, in the present embodiment, when a lightning surge current flows through the distribution line 11, the current is increased by the high voltage pull-down line 13,
Lightning protection device 6 through cutout 2 and connector 59
2 flows to one of the electrode fittings 66. Then, the surge current flows through the lightning protection element 64 in the lightning protection device 62 and the other electrode metal fitting 67 to the conducting wire 68 and is discharged to the ground. or,
The subsequent flow generated thereafter is suppressed and cut off by the lightning protection element 64. As a result, the transformer 4 and other power distribution devices can be protected from lightning surge current.

Further, when the electric power is overloaded in the consumer who is supplied with the electric power through the low voltage pull-down line 75, the current is cut off by the current limiting fuse 44 in the cutout 2.
As a result, the transformer 4 can be protected from overcurrent.

In the present embodiment, the housing cylinder 3 is installed at the upper end of the electric pole 1, and the cutout 2 is provided in the housing cylinder 3.
Are housed in a state of being arranged vertically. A cylindrical transformer 4 is installed on the upper end of the housing cylinder 3.
Together with the electric pole 1 and the housing cylinder 3, they form one pillar.
Therefore, unlike the conventional technology in which the transformer and the cutout are installed so as to project to the side of the utility pole, the appearance of the utility pole 1 can be made very clean and its appearance can be improved, thus improving the environmental aesthetics. Can be achieved. Moreover, since the transformer 4 is installed on the upper end of the housing cylinder 3 and the upper end opening is closed, the cutout 2 in the housing cylinder 3 is closed.
Is completely isolated from the outside. Therefore, unlike the prior art in which the cutout is exposed to the outside, the cutout 2 is not polluted and its insulation performance is not deteriorated, and it is not affected by wind, rain, sunlight, or the like. The durability of the cutout 2 can be improved.

In this embodiment, the support insulator 10 supporting the distribution line 11 is supported by the arm 5 attached to the utility pole 1 so that the distribution line 11 is cut on the utility pole 1. It is reliably separated from the out 2 and the transformer 4 in the horizontal direction at a predetermined interval. Then, the high-voltage pull-down wire 13 that connects the support insulator 10 and the cutout 2
Is drawn into the accommodating cylinder 3 through the arm 5 and the utility pole 1, and the cutout 2 and the transformer 4 are connected to each other in the accommodating cylinder 3 by the relay wire 14. Moreover, the low-voltage pull-down wire 75 connected to the transformer 4 also passes through the housing cylinder 3 and is drawn into the electric pole 1.

Therefore, not only the cutout 2 but also the pull-down wires 13, 75 and the relay wire 14 are not exposed to the outside, so that the appearance of the utility pole 1 does not become cluttered and the appearance of the utility pole 1 does not become cluttered. Can be made even cleaner and the environmental aesthetics can be further improved. Moreover, those lines 13,
Insulation performance of 14,75 deteriorates, and the same line 13,14,
Since 75 is not affected by wind, rain, sunlight, external force, etc., it is possible to improve the durability thereof.
In particular, since the connecting portions of the wires 13, 14, 75 to the supporting insulator 10, the cutout 2 and the transformer 4 are not exposed to the outside, there is a risk that rainwater or the like may enter from these connecting portions and cause a failure. Nor. Further, the cutout 2 and the wires 13, 14, and 75 are internally provided to make the appearance of the utility pole 1 orderly, so that the occurrence of bird damage can be surely prevented.

Further, in this embodiment, two open / close doors 77, 78 are provided in the accommodating cylinder 3, and the cutouts accommodated in the accommodating cylinder 3 are opened by opening the open / close doors 77, 78. It is possible to easily perform inspection work, repair work, and the like on item 2 and its peripheral parts. Therefore, the cutout 2 and each wire 1 connected to the cutout 2 or the transformer 4
Even if 3, 14, and 75 are provided in the housing cylinder 3, the inspection work, the repair work, and the like can be performed without any trouble at the installation site of the electric pole 1. In addition, the appearance of the utility pole 1 is not cluttered, and the distribution line 11 is reliably separated from the cutout 2 and the transformer 4 on the utility pole 1 in the horizontal direction at a predetermined interval. It is possible to secure a sufficient working space on 1 and to perform various tasks such as inspection more easily.
Workability can be improved.

Further, in the present embodiment, the high-voltage pull-down wire 13 and the relay wire 14 and the low-voltage pull-down wire 75 are arranged in parallel in the accommodating cylindrical body 3 without cluttering. Therefore, when the opening / closing door 78 of the housing cylinder 3 is opened, it is possible to easily recognize whether the lines 13, 14, 75 are the primary side or the secondary side. Therefore, in combination with the plurality of cutouts 2 being vertically arranged, it is possible to greatly contribute to the improvement of the workability described above. Also, by color-coding the three-phase lines 13, 14, 75 for each phase, it is possible to easily identify which phase the lines 13, 14, 75 are.

Further, in this embodiment, the arm 5 supporting the support insulator 10 is detachably fixed to the electric pole 1 by the bolt 8 and the nut 9. Therefore, the utility pole 1
The arm 5 can be easily attached and detached even at the installation site of, and the pulling work of the high voltage down line 13 into the telephone pole 1 etc.
It is also possible to easily perform the pole mounting work at the installation site of the electric pole 1.

Further, in this embodiment, a plurality of cutouts 2 are provided.
Is attached to the mounting plate 41 in the housing cylinder 3 with bolts 47 and nuts 4.
It is detachably fixed by 8. Then, the plurality of cutouts 2 and the housing cylinder 3 that houses them are 1
The two units are installed on the utility pole 1 in a state of being made up. Therefore, at the site where the utility pole 1 is installed, the cutout 2 can be installed on the utility pole 1 by a simple operation of simply mounting the housing cylinder 3 in which the cutout 2 is previously installed on the utility pole 1. Moreover, since the respective cutouts 2 can be individually attached and detached, their repair work and replacement work can be easily performed for each cutout 2. Also, as mentioned above, multiple cutouts 2
By vertically arranging the cutouts 2 in the housing cylinder 3, the cutouts 2 can be compactly housed in the cylindrical housing cylinder 3 similar to the utility pole 1. As a result, when a unit incorporating these cutouts 2 is mounted on the utility pole 1, the unit can be integrated with the utility pole 1 in appearance, and the above-mentioned environmental aesthetics can be improved.

Further, in this embodiment, one end of the relay wire 14 connected to the transformer 4 is connected to the cutout 2 via the connector 59, and the connector 59 is provided with the lightning protection device 62. An engagement hole 59c is provided. Therefore, with the lightning protection device 62 attached to the connector 59, the lightning protection device 62 is interposed between the cutout 2 and the transformer 4 only by connecting the relay line 14 to the cutout 2 via the connector 59. be able to. That is, in the present embodiment, the facility of the lightning arrester 62 can be simultaneously performed in the process of connecting the relay line 14 to the cutout 2. Therefore, no special work is required for the facility of the lightning protection device 62, and the facility work can be easily performed.

Further, the lightning protection device 62 is not built in other equipment, but is configured by itself, and is simply inserted and fixed in the engagement hole 59c of the connector 59. It's just Therefore, when replacing or inspecting the lightning protection device 62, the lightning protection device 6 exposed by opening the opening / closing door 78 of the housing cylinder 3 is opened.
Since it suffices to insert / remove the connector 2 into / from the connector 59, the replacement and the like can be performed very easily. Moreover, even if the lightning arrester 62 is destroyed due to an unexpectedly large inrush of lightning surge, there is almost no possibility of damaging the surrounding equipment or the power distribution system, and the damage scale is minimized to the extent possible. Only the lightning protection device 62 needs to be replaced.

The lightning arrester 62 is removed from the engaging hole 59c of the connector 59, and instead, the engaging hole 59c is removed.
It is also possible to connect another branch line (not shown) to c. Therefore, in the present embodiment, the lightning arrester 62 and the branch line can be selectively used as needed. The lightning protection device 62 is housed in the housing cylinder 3 together with the cutout 2 and is not exposed to the outside. Therefore, it is possible to contribute to the improvement of the environment beautification described above, and it is possible to improve the durability of the lightning protection device 62 without causing the lightning protection device 62 to be contaminated and its insulation performance to be deteriorated.

The present invention is not limited to the above-mentioned embodiment, but the constitution of each part can be modified and embodied as follows. (1) As shown in FIG. 7, the lightning protection device 7 having substantially the same configuration as the lightning protection device 62 provided in the housing cylinder 3 is also provided on the support insulator 10.
Attach 9. With this configuration, when a lightning surge current flows through the distribution line 11, the current is flashed over from the distribution line 11 side to the charging side of the lightning protection device 79, and the lightning protection element 80 and the lightning protection device 80 in the lightning protection device 79 are connected. It flows through the grounding side of the lightning arrester 79 to the arm 5 and is further discharged to the ground through the utility pole 1. In addition, the subsequent current generated is the lightning protection element 80.
Is suppressed and blocked by. As a result, disconnection of the distribution line 11 can be prevented.

(2) The arm 5 is not formed into an L-shape, but is simply a rod extending horizontally with respect to the utility pole 1, and a plurality of supporting insulators 10 are arranged and supported along the longitudinal direction thereof. . By doing so, it is possible to deal with the case where the distribution line 11 is arranged horizontally.

(3) The cutout 2 is housed in the upper portion of the utility pole 1 without providing the housing cylinder 3 for housing the cutout 2. In this case, the transformer 4 is installed on the upper end of the electric pole 1.

[0041]

As described above in detail, according to the present invention,
It has the following excellent effects. According to the first and second aspects of the present invention, it is possible to improve the appearance of the environment by making the outer appearance of the support pillars clean, prevent the occurrence of bird damage, and further, in case of inspection or repair, etc. Not only can workability be improved, but durability of relay devices and cables can be improved.

According to the third aspect of the present invention, by opening the opening / closing portion, it is possible to easily carry out inspection work and repair work of the relay equipment housed in the support column without any trouble.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a wiring system of a distribution transformer primary cable embodying the present invention.

FIG. 2 is a cross-sectional view showing the insides of a housing cylinder and armpieces.

FIG. 3 is a partially enlarged sectional view showing a support insulator and its peripheral structure.

FIG. 4 is a partially enlarged sectional view showing a cutout and its peripheral structure.

5 is a cross-sectional view taken substantially along the line AA in FIG.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a partially enlarged sectional view showing another example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Utility pole which comprises a pillar, 2 ... Cutout as a relay device, 3 ... Storage cylinder which comprises a pillar, 4 ... Transformer, 5
... a wire as a branch arm, 10 ... a support insulator as a terminal insulator, 11 ... a distribution line, 13 ... a high voltage pull-down wire constituting a primary side cable, 14 ... a relay line constituting a primary side cable,
77 ... Opening / closing door as an opening / closing section, 78 ... Opening / closing door as an opening / closing section.

Front page continuation (72) Hiromi Nagasaka, No. 56, Sudamachi, Mizuho-ku, Nagoya-shi, Japan Insulator Co., Ltd. (72) Inventor, Junichi Matsumoto, No. 2-56, Suda-machi, Mizuho-ku, Nagoya, Japan ) Inventor Mitsuhiro Honda 2-5, Sudamachi, Mizuho-ku, Nagoya

Claims (3)

[Claims] 1. A terminal insulator in which a transformer is provided on a pole having a branch arm, a relay device for protecting the transformer is housed in the pole, and the branch arm supports an overhead distribution line. A cable that connects to the terminal insulator and branches the distribution line is passed through the branch arm and drawn into the pillar, and the distribution line, the relay device, and the transformer are connected by the cable in the pillar. Wiring method for transformer primary cable. 2. The distribution transformer primary cable wiring system according to claim 1, wherein the transformer is arranged on a cylindrical pillar to close an upper end opening of the pillar. 3. The distribution transformer primary cable wiring method according to claim 1, wherein an opening / closing portion is provided on the support at a position corresponding to the accommodating portion of the relay device.