JPH06165353A - Multiconductor transmission line - Google Patents

Abstract

PURPOSE:To effectively prevent the occurrence of corona noise by preventing spacers which support the subline conductor of a transmission line from generating heat and, at the same time, relieving the potential gradient between the main line conductors and subline conductor of the transmission line. CONSTITUTION:A subline conductor 14 of this transmission line can be maintained at the same potential as those at the main line conductors 12A and 12B of the transmission line on the ground-side, since the subline conductor 14 is supported by the main line conductors 12A and 12B through conductive spacers 16A, 16B, and 16C. Therefore, the surface potential gradients between the main line conductors 12A and 12B decrease and the occurrence of corona noise can be effective reduced. In addition, since the impedance of the subline conductor 14 is increased due to the reactance of a current transformer 20 installed to the subline conductor 14, the current separated to the subline conductor 14 from the main line conductors 12A and 12B can be suppressed. Therefore, the conductive spacers 16A, 16B, and 16C can be effectively prevented from generating heat.

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 kind is mounted with a slack in the lower part of the middle of a plurality of main conductors and between two main conductors on the ground side of the plurality of main conductors. The line conductor is supported by the two main line conductors on the ground side by the supporting portions at intervals in the longitudinal direction. In this multi-conductor transmission line, the line conductor between the two main conductors on the ground side and the ground reduces the surface potential gradient of the main conductor on the ground side, so that corona noise is effectively generated during rainfall. This is advantageous because it is prevented.

In this prior art multiconductor transmission line,
The support part consists of a spacer with a clamp, and the line conductor is supported by the two main conductors on the ground side by this spacer. If this spacer is made conductive so that a current flows through the line conductor, Since the current flowing through the conductive spacer causes the movable portion of the spacer to generate heat, conventionally, an insulating spacer is used to support the line conductor on the ground-side main line conductor.

[0004]

However, if the line conductor is supported by using an insulating spacer that does not allow a current to flow in the line conductor, the line conductor is relaxed in order to reduce the surface potential gradient of the main line conductor on the ground side. A semiconductive organic material is interposed between the main line clamp of the spacer or between the main line clamp and the main line conductor so that the same potential is maintained between the main line conductor and the main line conductor and the current is not shunted to the main line conductor. Therefore, there is a fear that the organic substance deteriorates due to long-term use and the original function of the organic substance is deteriorated.

The object of the present invention is to avoid the above-mentioned drawbacks and to prevent heat generation in the spacers supporting the line conductors.
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 additional conductor.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a plurality of main wire conductors and a lower middle portion between two main wire conductors on the ground side of the plurality of main wire conductors. In a multi-conductor transmission line, which is composed of a line conductor that is slackened by a bridge, and which is supported by two main line conductors on the ground side at intervals in the longitudinal direction by supporting portions. It is an object of the present invention to provide a multi-conductor transmission line characterized in that the supporting portion is made of a conductive spacer, and a current transformer is installed on the line conductor or the conductive spacer.

[0007]

In this way, if the conductor of the main line is supported by the two conductors on the ground side by the conductive spacers, the main conductor and the conductor of the main line are maintained at the same potential, so that the surface potential of the main conductor on the ground side is maintained. The inclination is reduced, and the corona noise can be effectively reduced. Further, since the reactance of the current transformer installed in the line conductor or the conductive spacer increases the impedance of the line conductor and suppresses the current shunted to the line conductor, the conductive spacer is effectively prevented from generating heat. be able to.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described in detail. FIGS. 1 to 3 show a multi-conductor transmission line 10 according to the present invention.
The multi-conductor power transmission line 10 includes a plurality of (mainly eight in the case of) main line conductors 12 installed between unillustrated steel towers, and two of the plurality of main line conductors 12 on the ground side.
It is composed of a line conductor 14 which is laid with a slack in the lower part of the middle of the main line conductors 12A and 12B.

Both ends and the middle of the line conductor 14 are supported by the two main line conductors 12A and 12B on the ground side by the support portion 16 composed of the conductive spacers 16A to 16C. In the illustrated embodiment, the line conductor 14 includes conductive spacers 16A and 16C at both ends and a conductive spacer 16B in the middle.
And conductor portions 14A and 14B respectively supported between and (see FIG. 3). Conductive spacers 16 on both ends
A and 16B have three clamp parts 18A to 18C, and two clamp parts (main line clamp parts) 18A and 18C.
B clamps the two main wire conductors 12A and 12B on the ground side, and the other clamp portion (applied wire clamp portion) 18C clamps the outer ends of the conductor portions 14A and 14B of the applied wire conductor 14. (See Figure 2). The intermediate conductive spacer 16C has four clamp portions 18A to 18D, and two clamp portions (main line clamp portions) 18A and 18D.
B clamps the two main conductors 12A and 12B on the ground side, and clamps other clamp parts (line clamp parts) 18C and 18C.
D clamps the inner ends of the conductor portions 14A and 14B of the line conductor 14 (see FIG. 2). As the conductive spacers 16A to 16C, those having substantially the same structure as the conductive spacer used in another embodiment of the present invention which will be described later with reference to FIG. 4 are used.

The multiconductor power transmission line 10 of the present invention further includes a current transformer 20 installed on the line conductor 14, as shown in FIGS. 2 and 3. In the illustrated embodiment, the current transformer 20 is installed near the ends of the conductor portions 14A, 14B of the line conductor 14 on the side closer to the spacers 16A, 16B.

As described above, the line conductor 14 is formed by the conductive spacers 16A to 16C and the two main conductors 1 on the ground side.
When supported by 2A and 12B, the main conductor 12A on the ground side,
Since 12B and the line conductor 14 are kept at the same potential, the surface potential gradient of the ground-side main line conductors 12A and 12B is reduced, and corona noise can be effectively reduced. Also,
Since the reactance of the current transformer 20 installed in the conductor portions 14A and 14B of the line conductor 14 increases the impedance of the line conductor 14, the ground side main line conductors 12A and 12B.
The current shunted from the line conductor 14 to the line conductor 14 is suppressed, and thus the heat generation of the conductive spacers 16A to 16C can be effectively prevented.

In the embodiment of FIGS. 2 and 3, the line conductor 14
Is composed of two conductor portions 14A and 14B, and the current transformer 20 is directly installed on the line conductor 14, but the line conductor 14 is composed of one continuous conductor as shown in FIG. In addition, the current transformer 20 is attached to the conductive spacers 16A to 16C.
May be installed. Conductive spacers 16A to 1
6C is a suspension fitting 24 having a spacer bar 22 having main line clamp portions 18A, 18B at both ends for clamping the two main line conductors 12A, 12B on the ground side, and a line clamp portion 18C for clamping the line conductor 14 The suspension fitting 24 is suspended in the middle of the spacer bar 22 by a mounting bolt 26, a nut 28, and a spring 30. The current transformer 20 is installed on the suspension fitting 28.
The suspension metal fitting 24 is connected to the mounting bolt 26 and the line clamp portion 18C via the pivot portions 24a and 24b.

[0013]

According to the present invention, as described above, since the line conductor is supported by the two main conductors on the ground side by the conductive spacers, the line conductor and the line conductor are kept at the same potential. Therefore, the surface potential gradient of the main conductor on the ground side can be reduced and corona noise can be effectively reduced, and the reactance of the current transformer installed in the line conductor or the conductive spacer can reduce the effect of the line conductor. Since the impedance is increased, the current shunting from the main conductor to the additional conductor can be suppressed, so that the heat generation of the conductive spacer can be effectively prevented.

[Brief description of drawings]

1 is a cross-sectional view of a multiconductor transmission line according to the present invention.

FIG. 2 is a top view of a main part of an embodiment of the multiconductor power transmission line of the present invention.

3 is a side view of the multiconductor transmission line of FIG. 2. FIG.

FIG. 4 is an enlarged front view of a conductive spacer used in another embodiment of the present invention.

[Explanation of symbols]

 10 Multi-conductor Transmission Line 12 Main Line Conductor 12A Ground Side Main Line Conductor 12B Ground Side Main Line Conductor 14 Additional Line Conductor 14A Conductor Part 14B Conductor Part 16A Conductive Spacer 16B Conductive Spacer 16C Conductive Spacer 18A Main Line Clamping Part 18B Main Line Clamping Part 18C Line clamp part 18D Line clamp part 20 Current transformer 22 Spacer bar 24 Suspension metal fitting

Claims (1)

[Claims] 1. A plurality of main wire conductors and an attached wire conductor that is laid with a slack in the lower part of the middle of the plurality of main wire conductors on the ground side. In the multi-conductor power transmission line, wherein the line conductor is supported by the two main conductors on the ground side by a supporting portion at intervals in the longitudinal direction, the supporting portion is made of a conductive spacer,
A multi-conductor power transmission line is characterized in that a current transformer is installed on the line conductor or the conductive spacer.