JPS6019484Y2 - Pole wiring structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pole-mounted wiring structure between a transformer secondary side on a utility pole or a low-voltage distribution line to a drop-in line.

General low-voltage wiring runs from a high-voltage overhead distribution line through a pole transformer to a low-voltage main line, and power distribution lines are connected to the low-voltage main line to lead to general households, factories, etc.

By the way, conventional methods for wiring from the low-voltage line to the drop-in line include placing an insulated wire in a pipe, or running the cable along a utility pole and fixing it with a support band or the like.

FIG. 1 shows an example of a conventional pole installation that uses insulated wires to pull down from a transformer, where 21 is a utility pole, 22 is a pole-mounted transformer, and 23 is a low-voltage terminal of the pole-mounted transformer. Low voltage main line 24
is connected to the low voltage terminal 23 and pulled down along the utility pole 21,
It is fixed to the low-voltage pin insulator 26 of the lead-in arm 25, and its terminal end is connected to the lead-in line 28 by a branch connector 27, and is wired to a low-voltage consumer.

In the figure, 29 is a support for fixing the low-voltage service line 28, and 30 is a fuse for protection, which is usually attached only to the sum of the voltages of the low-voltage service line.

Since this pole installation method uses insulated wires for the low-voltage main line 24, a protective pipe 31 is required to protect the insulator, and the wiring procedure is fixed with a protective pipe mounting bracket 32. After running the electric wire, the upper end is connected to the low voltage terminal 23 of the pole-mounted transformer, and the lower end is connected to the low voltage drop-in line using the branch connector 27. It is difficult to perform complicated work in such a posture, and when the low voltage service line 28 is multi-stranded, the support 29 of the low voltage service line 28 is separated by the branch connector 27.
The wiring around the edge of the pole is congested near the utility pole 21 and the retracting arm 25, and improvements have been desired in terms of safety for pole installation workers.

Also, Figure 2 (front view) and Figure 3 (plan view) are other examples of conventional pole mounting, and unlike insulated wires, cables are used, so there is no need for a protective pipe and the wires are directly attached to the utility pole 21. This is what I did.

That is, this is a pole installation method in which several low-voltage main lines 33 are arranged in parallel on the utility pole 21 and directly fixed to the utility pole 21 and the lead-in arm 25 using the utility pole band 34 and the binding wire 35, and the workability is better than the above example. Although this is an improvement, when a worker climbs up a pole and wraps a safety belt around the pole during routine maintenance inspections, etc., because the pole and cable are in close contact, the safety belt must be wrapped around the cable, causing damage to the cable. There were also accidents that caused damage.

Furthermore, the low voltage main line 33 and the utility pole 21 or the lead-in arm 25
Since the branch connectors 27 are in contact with each other, it is necessary to strengthen the insulation treatment of the branch connectors 27.

Usually, this process is carried out by winding with an insulating tape, but there is a drawback that it takes a long time to wrap a branch connection having multiple branch lines on a pole with tape.

It is an object of the present invention to provide a pole-mounted wiring structure that eliminates these conventional drawbacks, facilitates pole installation work, and eliminates the risk of cable damage during maintenance and inspection.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

First, in the branch unit used in the present invention, as shown in Fig. 4, a required number of branch wires 2 made of cables of a required length are connected to the lower end of a pull-down bus 1 made of cables of a required length using connection sleeves 3. For example, in the case of a single-phase three-wire system, the required sets of the above-mentioned busbars 1 are twisted together to form the busbar section A.
The branch wire 2 is branched left and right to form bundles B and C.

As shown in FIG. 5, the connection sleeve 3 is made by compressing and connecting the core wires of the bus 1 and the core wires of the plurality of child wires 2 with a connection sleeve main body 3a, and then forming a sleeve cover 3b whose bottom is made of an insulating material.
is inserted from one end of the bus bar 1 and fixed onto the connection sleeve main body 3a.

It is desirable that the ends of the bus 1 and the daughter wires 2 have wire core identification portions 1a and 2a to facilitate the connection work, and for example, they may be wrapped with color-coded tapes.

Rather than manufacturing branch units with such a configuration on-site, it is preferable to prepare in advance standard products in the required number and size.

Next, FIGS. 6 and 7 respectively show examples of the pole-mounted structure of the present invention. First, we will explain the example of a single-phase three-wire system drawn from the transformer in FIG. 6. The part A, which is made by twisting three wires of the busbar 1, is attached to the utility pole 5 through the mounting bracket 4 at a required distance, and the tip of the busbar 1 is connected to the pole transformer 6.
The bundles B and C on the left and right sides of the child wire 2 are directly fixed to the side or lower part of the retracting arm 8 with binding wires 9.

Among the sub wires 2, the ends of the voltage summation wires are connected to the low voltage drop-in line 11 via the fuse 10, and the tips of the ground phase sub wires are directly connected to the low voltage drop-in line 11.

A conductor connector 12 is used to connect these child wires 2 to the fuse 10 or the low voltage lead-in line 11.

In the figure, reference numeral 13 denotes a support for supporting the low-voltage lead-in line 11 on the lead-in arm 8 side.

Next, in the example of a 3-phase 4-wire system drawn from a low-voltage overhead line as shown in FIG. The tip of the bus bar 1 is connected to the low-voltage overhead line 15 at the connection part 14, and the daughter wire 2 is divided into left and right bundles B and C, and each is fixed directly to the side or bottom of the lead-in arm 8 with a bind wire 9. do.

In the figure, 16 indicates a supporting insulator for the low voltage overhead line 15, 17 indicates a supporting insulator, and 18 indicates a pine wire.

The connection between the child wire 2 and the low voltage overhead line 1 is the same as the example shown in FIG. 6 above.

As described above, according to the present invention, since cables are used for the bus bar 1 and child wires 2 of the branch unit, there is no need for a protective pipe when installing them, unlike when using insulated wires, and the mounting bracket 4 and binder wires are not required. It can be directly fixed with wire 9 or 18, and bus bar 1 has 3 wires for single-phase 3-wire system and 4 wires for 3-phase 4-wire system, depending on the distribution method of the low-voltage line.
Since the books are twisted together, they can be fixed together with the mounting bracket 4, making it easy to attach to the pole.Also, since the books can be fixed apart from the utility pole 5 with the mounting bracket 4, the safety belt for workers during maintenance and inspection etc. can be wrapped only around the utility pole 5 through the gap between the utility pole 5 and the busbar portion A, eliminating the risk of damage caused by the safety belt as in the conventional case.

In addition, as a branch unit used in this invention, it is possible to prepare a branch unit with the dimensions of the busbar section A and the dimensions of the left and right sections B and C of the sub-wires set in advance and standardized according to the power distribution system, so that cutting on the pole is possible. This greatly simplifies the work, makes the pillars more beautiful, and improves the efficiency of the work.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional example, Fig. 2 is a front view of another conventional example, Fig. 3 is a plan view thereof, Fig. 4 is a front view of a branch unit according to the present invention, and Fig. 5 is a front view of another conventional example. A sectional view showing the connection part,
FIGS. 6 and 7 are front views showing embodiments of the present invention, respectively. 1... Bus line, 2... Child line, 3...
...Connection sleeve, 4...Mounting bracket, 5...
...Electric pole.

Claims (1)

[Scope of utility model registration request] The required number of branch wires made of cables of the required length are connected to the lower end of the pull-down bus bar made of cables of the required length using connecting sleeves, and the required sets are twisted together, and the child wires are branched to the left and right. The branch unit was made into an integrated inverted T-shaped branch unit, and the busbar part of this branch unit was installed along the utility pole at a required distance from the utility pole, and the branch unit was installed in the left-right direction along the above-mentioned child wire part and the horizontal arm. A pillar-mounted wiring structure characterized by: