JP3171499B2 - Multi-conductor transmission line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a multiconductor transmission line installed between steel towers.

[0002]

2. Description of the Related Art A multi-conductor power transmission line of this type is provided with a slack under a substantially middle portion between a plurality of main conductors and two main conductors on the ground side of the plurality of main conductors. The auxiliary wire conductor is supported by the two main line conductors on the ground side at intervals in the longitudinal direction by a support portion. In this multi-conductor power transmission line, the corona noise is effectively generated during rainfall because the auxiliary conductor reduces the surface potential gradient of the main conductor on the ground side between the two main conductors on the ground side and the ground. Advantageously, it is prevented.

In this prior art multiconductor transmission line,
The supporting portion is composed of a spacer with a clamp, and the auxiliary conductor is supported by the two main conductors on the ground side by the spacer. If the spacer is made conductive so that current flows through the auxiliary conductor, Since the movable portion of the spacer generates heat due to the current flowing through the conductive spacer, the auxiliary conductor is conventionally supported by the main conductor on the ground side using an insulating spacer.

[0004]

However, if the auxiliary conductor is supported by using an insulating spacer that does not allow a current to flow through the auxiliary conductor, the auxiliary conductor is required to reduce the surface potential gradient of the main conductor on the ground side. A semiconductive organic substance is interposed between the main line clamp of the spacer or the auxiliary line clamp and the auxiliary line conductor so that the electric potential between the main line conductor and the main line conductor is maintained at the same potential, and current does not shunt to the auxiliary line conductor. Therefore, there is a possibility that the organic substance is deteriorated by long-term use, and the original function of the organic substance is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to avoid the above-mentioned drawbacks and prevent the spacer supporting the auxiliary conductor from generating heat.
Another object of the present invention is to provide a multi-conductor power transmission line that can reduce the potential gradient between the main conductor and the auxiliary conductor.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of main conductors and a lower part of a middle portion between two main conductors on the ground side among the plurality of main conductors. And an auxiliary conductor which is attached with a slack, and which is supported by two main line conductors on the ground side for each independent conductor at intervals in the longitudinal direction by a support portion. A multi-conductor transmission line, characterized in that the multi-conductor transmission line includes electric conduction means for electrically conducting the auxiliary conductor to the two conductors on the ground side only at any one place in the span. Is to provide.

[0007]

As described above, when the independent conductors of the auxiliary conductors are electrically connected to the two conductors on the ground side, the main conductor and the auxiliary conductors are maintained at the same potential. The surface potential gradient of the conductor is reduced, so that corona noise can be effectively reduced. In addition, only one electrical conductor is electrically connected to the two main conductors on the ground side for each independent conductor, so that a current flows from the two main conductors on the ground side to the auxiliary conductors. Therefore, heat generation of the conductive spacer can be effectively prevented.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of the present invention; FIG.
The multi-conductor power transmission line 10 is composed of a plurality of (eight in the illustrated case) main wires 12 laid between steel towers (not shown), and two of the plurality of main wires 12 on the ground side.
And an auxiliary conductor 14 attached with a slack at a substantially middle lower portion between the main conductors 12A and 12B. The auxiliary conductor 14 is a support insulator 1 having an insulating property at both ends.
6 and 16 ′, and are supported by the retaining portions 18, 18 ′ of the tower, and are supported by two supporting members 20 on the ground side at intervals in the longitudinal direction by the supporting portions 20. The support 20 will be described later in detail in connection with the main part of the present invention.

The multi-conductor power transmission line 10 of the present invention has only one arbitrary location on each of the independent conductors of
An electrical conduction means 22 is provided for electrically conducting to the main wire conductors 12A and 12B. In the embodiment shown in FIGS. 1 and 2, since the auxiliary conductors 14 are continuous between the spans, the conductors 14 are electrically connected to the two conductors 12A and 12B on the ground side only at any one place of the span. In addition, the electrical conduction means 22
It comprises one conductive wire spacer 24 constituting a part of the support part 20 and a plurality of insulating wire spacers 26 constituting the remaining part of the support part 20. As shown in FIG. 1, the conductive auxiliary spacers 24 are disposed substantially at the center of the span, and the insulating auxiliary spacers 26 are disposed at intervals in the longitudinal direction.

With this configuration, the auxiliary conductor 14 is
The two main conductors 12 on the ground side are connected by the conductive auxiliary spacers 24.
A, 12B, because it is electrically conductive to the main conductor 12A,
12B and the auxiliary conductor 14 are maintained at the same potential, and the surface potential gradient of the main conductors 12A and 12B on the ground side is reduced, so that corona noise can be effectively reduced. In addition, the auxiliary conductor 1
Only the conductive additional spacer 24 electrically connects the two main conductors 12A and 12B on the ground side, and the other auxiliary spacer 26 as the other support portion 20 is insulative. And both ends of the auxiliary conductor 14 are insulated support insulators 1.
6, 16 ', the two main conductors 12A, 1
Current does not shunt from 2B to the auxiliary conductor 14.

[0011] The conductive auxiliary spacers 24 are shown in FIGS.
As shown in the figure, two main conductors 12A, 12B on the ground side
Spacer bars 32 having main wire clamp portions 28A and 28B suspended at both ends thereof via suspension brackets 30A and 30B, and a wire clamp portion 2 for clamping the wire conductor 14.
8C and 28D are suspended at both ends via suspension brackets 30C and 30D. The overturn prevention bar 34 is provided at the middle of the spacer bar 32 with a mounting screw perpendicular to the spacer bar 32. 36 attached. Suspension fittings 30A to 30D and spacer bar 3
2 and between the fall prevention bar 34
0A to 30D are the spacer bar 32 and the fall prevention bar 3
Spring 3 for holding it in a vertical position with respect to 4
8 are provided. The overturn prevention bar 34 cooperates with the auxiliary wire clamp portions 28C and 28D attached to both ends thereof via suspension brackets 30C and 30D, and acts so that the sparger bar 32 does not fall down in the line direction.

The insulating auxiliary wire spacer 26 is shown in FIGS.
As shown in the figure, two main conductors 12A, 12B on the ground side
Bar bars 40A, 40B suspended at both ends via suspension fittings 42A, 42B, and a wire clamp portion 4 for clamping the wire conductor 14.
0C and 40D are provided with overturn prevention bars 48 suspended at both ends via high-pressure tension insulators 46A and 46B. The overturn prevention bar 48 is mounted in the middle of the spacer bar 44 so as to be orthogonal to the spacer bar 44. It is attached by screws 50. These suspension fittings 42A and 42B are located between the suspension fittings 42A and 42B and the spacer bar 44 and between the high-pressure tension insulators 46A and 46B and the fall prevention bar 34.
B and the high-pressure tension insulators 46A and 46B are spacer bars 4
A spring 52 is provided for holding the spring 4 in a vertical position with respect to the fall prevention bar 48. The overturn prevention bar 48 cooperates with the auxiliary wire clamp portions 40C and 40D attached to both ends thereof via high-pressure tension insulators 46A and 46B so as to prevent the spacer bar 44 from falling down in the line direction. .

As shown in FIG. 1, the conductive auxiliary spacer 24 is located in the middle of the span because the auxiliary conductor 14 is insulated at both ends, and is induced by the auxiliary conductor. This is for equalizing the induced voltage.

In the embodiment shown in FIGS. 2 to 8, the conductive auxiliary spacer 24 and the insulating auxiliary spacer 26 have a fall prevention structure. However, as shown in FIGS. 9 and 10, a fall prevention structure is provided. It is also possible to use a conductive auxiliary spacer 24A and an insulating auxiliary spacer 26A which are not used. As shown in FIG. 9, the conductive auxiliary spacer 24A is
Clamps 28A, 28 directly attached to both ends of
B and one additional wire clamp portion 28C attached to the middle of the spacer bar 32 via a short hanging bracket 30. As shown in FIG. 10, the insulating auxiliary wire spacer 26A includes main line clamp portions 40A and 40B directly attached to both ends of the spacer bar 44, and the spacer bar 4A.
4 and one auxiliary wire clamp 40C attached via a short high-pressure tension insulator 46. Note that the same portions are denoted by the same reference numerals.

In the embodiment shown in FIG. 11, all of the support portions 20 of the auxiliary conductors 14 are composed of insulating auxiliary spacers 26, and the electric conduction means 22 is attached to the support insulator 16 for holding one end of the auxiliary conductor 14. Alternatively, it is provided with a retaining metal fitting 54 for retaining one end of the auxiliary conductor 14 so that one end of the auxiliary conductor 14 is electrically connected to the auxiliary conductor 14 via the retaining portion 18. . Also in this embodiment, the auxiliary conductor 14
The two main conductors 1 on the ground side are
Since the other portions are kept at the same potential as 2A and 12B and are insulated by the supporting portion 20 and the supporting insulator 16 'of the auxiliary conductor 14, current does not shunt from the main conductors 12A and 12B. In this embodiment, since all the spacers 26 can have the same structure, the number of parts is small, which is advantageous.

FIG. 12 and FIG. 13 show still another embodiment of the present invention. In this embodiment, the auxiliary conductors 14 are independent.
It consists of two short conductors 14A and 14B. One end of each short conductor 14A, 14B is connected to a high-voltage tensile insulator 56A, 56A.
Through the spacer bars 6 of the auxiliary spacers 58A, 58B
0A, 60B, and the other end is an additional wire spacer 58B,
It is directly fixed to the 58C spacer bars 60B, 60C. In this embodiment, the electrical conduction means 22 is constituted by auxiliary wire spacers 58B, 58C for each of the short conductors 14A, 14B. The auxiliary spacers 58A to 58A
8C is not described in detail, but the short conductor 14
The structure is substantially the same as that of FIGS. 9 and 10 except that the directions of the clamps of A and 14B are different.

Also in this embodiment, each of the short conductors 14A and 14B of the auxiliary conductor 14 is provided with an auxiliary spacer 58 having conductivity.
B and 58C keep the same potential as the main conductors 12A and 12B, and the high-voltage tensile insulators 56A and 56B prevent current from shunting from the main conductors 12A and 12B. Accordingly, the surface potential gradients of the main conductors 12A and 12B on the ground side are reduced, so that corona noise can be effectively reduced, and the auxiliary wire spacer does not generate heat when energized.

[0018]

According to the present invention, as described above, since the auxiliary conductor is electrically connected to the two main conductors on the ground side by the electric conduction means, the main conductor and the auxiliary conductor are electrically connected to each other. Can be maintained at the same potential, the surface potential gradient of the main conductor on the ground side is reduced, so that corona noise can be effectively reduced.
Since the current is carried out only at the two locations, the current does not shunt from the main conductor to the auxiliary conductor, and there is a practical advantage that the heat generation of the auxiliary spacer can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an embodiment of a multiconductor power transmission line according to the present invention.

FIG. 2 is a schematic cross-sectional view of one embodiment of a multiconductor power transmission line according to the present invention.

FIG. 3 is a top view of a conductive auxiliary spacer used in the multiconductor power transmission line of FIG. 1;

FIG. 4 is a front view of a conductive auxiliary spacer used in the multiconductor power transmission line of FIG. 1;

FIG. 5 is a side view of a conductive auxiliary spacer used in the multi-conductor transmission line of FIG. 1;

FIG. 6 is a side view of an insulating auxiliary wire spacer used in the multiconductor power transmission line of FIG. 1;

FIG. 7 is a front view of an insulating auxiliary wire spacer used in the multiconductor power transmission line of FIG. 1;

FIG. 8 is a side view of an insulating auxiliary wire spacer used in the multiconductor power transmission line of FIG. 1;

FIG. 9 is an enlarged front view of a different example of a conductive auxiliary spacer used in the multi-conductor transmission line of FIG. 1;

FIG. 10 is an enlarged front view of another example of the insulating auxiliary wire spacer used in the multiconductor transmission line of FIG. 1;

FIG. 11 is a schematic side view of another embodiment of the multi-conductor power transmission line according to the present invention.

FIG. 12 is a top view of still another embodiment of the multiconductor power transmission line according to the present invention.

FIG. 13 is a side view of the multi-conductor transmission line of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Multi-conductor transmission line 12 Main line conductor 12A Ground side main line conductor 12B Ground side main line conductor 14 Auxiliary line conductor 14A Short conductor 14B Short conductor 16 Support insulator 16 'Support insulator 18 Detention part 18' Detention part 20 Support part 22 Electrical conduction means 24 Conductive additional wire spacer 26 Insulating additional wire spacer 28A Main wire clamp portion 28B Main wire clamp portion 28C Additional wire clamp portion 28D Additional wire clamp portion 30A Hanging bracket 30B Hanging bracket 30C Hanging bracket 30D Hanging bracket 32 Spacer bar 34 Overturn prevention bar 36 Mounting screw 38 Spring 40A Main line clamp 40B Main line clamp 40C Auxiliary line clamp 40D Auxiliary line clamp 42A Suspension bracket 42B Suspension bracket 44 Spacer bar 46A High pressure insulator 46B High pressure tension Insulator 48 Fall prevention bar 50 52 spring 54 anchoring bracket 56A high tension insulators 56B high tension insulators 58A 添線 spacer 58B 添線 spacer 58C 添線 spacers 58D 添線 spacer

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takashi Shinohara 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (56) References JP-A-4-75411 (JP, A) JP-A-Hei 4-75412 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02G 7/14 H02G 7/12

Claims (1)

(57) [Claims] A plurality of main wire conductors, and a plurality of main wire conductors. In a multiconductor transmission line that is supported by the two main conductors on the ground side with a spacing in the longitudinal direction by a supporting portion, the auxiliary conductor may be provided at any one position for each independent conductor. A multi-conductor power transmission line, comprising: an electric conduction means for electrically conducting only to the two conductors on the ground side.