JPH04128032U - Overhead transmission line jumper device - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress corona discharge in the flexible jumper sections on both sides of the intermediate rigid jumper section. Mechanically, this prevents fatigue rupture due to stress concentration at the proximal end of the flexible jumper. [Structure] Flexible jumper parts 1B connected to the power transmission line main line 2 on both sides of the intermediate rigid jumper part 1A suspended below the tower arm 11 in a substantially horizontal state are connected to the power transmission line main line 2. It is composed of a stranded conductor 6 having a larger diameter and greater rigidity than the constituent stranded conductors. Since the stranded wire conductor 6 has a larger radius of curvature than before, its surface potential gradient becomes lower. In addition, as it becomes thicker and stiffer, it becomes less likely to cause lateral vibrations, etc.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea electrically connects the main power transmission lines on both the left and right sides of the tension tower. This invention relates to jumper devices for overhead power transmission lines.

0002

[Conventional technology]

As a type of jumper device on overhead power transmission lines, it is used on both the left and right sides of the tower. The main transmission line consists of an intermediate rigid jumper section and flexible jumper sections on both sides. electrically connected to each other via jumper wires, and the intermediate rigid jumper section Attach the end of the power line to a metal fitting such as a yoke between the main power line and the tensile insulator chain using a hanging material. The intermediate rigid jumper section is suspended approximately horizontally from the lower part of the tower arm. A suspended type structure in which a bar is installed is known.

0003

[Problem that the idea aims to solve]

By the way, in the conventionally used jumper device for overhead power transmission lines, , the flexible jumper sections on both sides of the intermediate rigid jumper section connect the stranded wires that constitute the main transmission line. The suspended jumper device is composed of a stranded conductor that is exactly the same as the conductor. has the following electrical and mechanical problems:

0004 In other words, it is made of the same stranded conductor as the stranded conductor that makes up the main transmission line. The flexible jumper part has a small wire diameter (radius of curvature of the conductor) and is thin, so it is has a high surface potential gradient, and therefore AN due to corona discharge occurs in rainy weather etc. It is likely to generate noise (radio noise or television noise). Also mechanically Because of their low rigidity, they tend to sway significantly when subjected to lateral wind pressure, etc. Therefore, the proximal end of the flexible jumper becomes fatigued due to stress concentration, which eventually leads to a disconnection accident. There is a risk of

[0005] This idea was made in view of the above points, and the AN A jacket that can eliminate noise generation and disconnection accidents at the ends of flexible jumpers. The purpose of this project is to provide a pump device.

[0006]

[Means to solve the problem]

In order to achieve the above purpose, in the jumper device of this invention, the tower arm The feeder on both sides of the intermediate rigid jumper, which is suspended in a substantially horizontal position below. The flexible jumper connected to the main power line is connected to the stranded conductor that constitutes the main power line. It is constructed from stranded wire conductors with a larger diameter and greater rigidity.

[0007]

[Effect]

A flexible jacket made of stranded conductors that are thicker than before (larger radius of curvature). Electrically, the surface potential gradient of the damper section is reduced, making it difficult for corona discharge to occur. It becomes. In addition, mechanically, since the rigidity is increased, lateral vibration and the like are less likely to occur.

[0008]

【Example】

Figure 1 shows the first embodiment of the overhead power transmission line jumper device according to this invention. Therefore, the main power transmission line 2 is connected to the clamp 9, the metal fittings 4 such as a yoke, and the tensile insulator chain 3. It is tensile supported by the arm 11 of the steel tower 10.

[0009] The intermediate rigid jumper section 1A and the flexible jumper sections 1B on both sides make the jump possible. A parallel line 1 is formed. The intermediate rigid jumper part 1A is an aluminum or copper pipe or rod. ・Constructed of a rigid conductive metal rod 7 such as a channel, with hanging material near both ends. 5 to a metal fitting 4 such as a yoke, and is thus approximately attached to the lower part of the tower arm 11. It is suspended horizontally. The flexible jumper part 1B connects the power transmission line main line 2 It is composed of a stranded conductor 6 that has a larger diameter and greater rigidity than the stranded conductors that constitute it. , connects the clamp 9 and the end of the rigid metal rod 7 with good conductivity.

0010 FIG. 2 shows a second embodiment of this invention, in which the main power transmission line 2 is constructed. A stranded wire conductor 6 having a larger diameter and greater rigidity than the stranded wire conductor comprising the It is a jumper conductor that runs through all the wires and electrically connects the main wires 2 to each other. The middle part of the stranded wire conductor 6 in the length direction is connected to the bottom of the tower arm 11 via the hanging member 5. A spacer 12 is attached to a rigid support 8 which is suspended in a substantially horizontal state on one side. It is kept attached.

[0011] In other words, in this embodiment, the rigid support 8 and the stranded wire conductor attached thereto are 6 constitutes an intermediate rigid jumper section 1A, and both of the intermediate rigid jumper sections 1A A flexible jumper portion 1B is constituted by the portion consisting only of the stranded wire conductor 6 on the side. A jumper wire 1 is formed by both of them.

In the jumper device shown in FIGS. 1 and 2, for example, when the stranded conductor constituting the main power transmission line 2 is a TACSR with a diameter of 240 mm ² (diameter 22.4 mm), the flexible jumper portion 1B has a length of 410 mm ² It is composed of a stranded conductor 6 such as TACSR (diameter 28.5 mm) or TAL (460 m ² ) (diameter 28.0 mm).

[0013]

[Effect of the idea]

According to the overhead power transmission line jumper device according to this invention, the following effects can be obtained. Ru. The flexible jumper parts 1B on both sides of the intermediate rigid jumper part 1A are different from the conventional ones. At the stranded conductor 6 which is thicker (has a larger radius of curvature) than the stranded conductor composing the main wire 2 In other words, it is composed of a stranded conductor 6 with a larger diameter and greater rigidity than before. Electrically, the surface potential gradient of the flexible jumper section 1B is reduced, so that A Corona discharge, which is a cause of N noise, can be suppressed. Also, mechanically, Since the rigidity of the flexible jumper portion 1B increases, lateral vibrations, etc. are less likely to occur, and Therefore, the base end of the flexible jumper portion 1B suffers from fatigue due to stress concentration and breaks. You can eliminate fear.

[Brief explanation of drawings]

FIG. 1 is a partially omitted side view showing a first embodiment of a jumper device for an overhead power transmission line according to the present invention.

FIG. 2 is a partially omitted side view showing a second embodiment of the jumper device for an overhead power transmission line according to the present invention.

[Explanation of symbols]

1 jumper wire 1A intermediate rigid jumper section 1B Flexible jumper part 2 Main power transmission line 3 Tensile insulators 4 Metal fittings 5 Hanging material 6 Stranded conductor 7 Good conductive metal rigid rod 8 Rigid support 9 Clamp 10 Steel tower 11 Arm 12 Spacer

Claims (3)

[Scope of utility model registration request] 1. In a jumper wire (1) consisting of an intermediate rigid jumper section (1A) and flexible jumper sections (1B) on both sides thereof, the vicinity of the end of the intermediate rigid jumper section (1A) is connected to the main power transmission line (1A). 2) and the tension insulator chain (3) via a hanging material (5), and the flexible jumper part (1B) is connected to the power transmission line main line (2). ), in which the flexible jumper portion (1B) is connected to a stranded conductor (6) having a larger diameter and greater rigidity than the stranded conductor constituting the main power transmission line (2).
A jumper device for an overhead power transmission line, comprising: 2. A jumper device for an overhead power transmission line according to claim 1, wherein the intermediate rigid jumper portion (1A) comprises a highly conductive metal rigid rod (7). 3. A jumper device for an overhead power transmission line according to claim 1, wherein the intermediate rigid jumper section (1A) comprises a rigid support (8) with a stranded conductor (6) attached thereto.