JPH08317543A - Multi-conductor spacer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a multi-conductor spacer in which a fault current does not flow between element conductors even when a fault current flows in a transmission line and the components constituting the multi-conductor spacer are not damaged. It is in. [Structure] An electric wire gripping clamp 12 that electrically connects the element conductor 1 and the frame 7, and an insulating wire gripping clamp 9 that insulates the element conductor 1 and the frame 7.

Description

Detailed Description of the Invention

[0001]

This invention relates to multiconductor spacers,
In particular, the present invention relates to a multi-conductor spacer that prevents deterioration of an insulator due to tracking and prevents damage due to an accident current caused by a ground fault, a short circuit accident, or the like.

[0002]

2. Description of the Related Art Conventionally, there is a multi-conductor aerial power transmission line having a plurality of element conductors as an aerial power transmission line corresponding to an increase in power transmission capacity. In such a multi-conductor overhead power transmission line (hereinafter referred to as a power transmission line), multi-conductor spacers that hold a plurality of element conductors at a predetermined interval are provided at a predetermined interval in the extension direction of the power transmission line.

FIG. 5 shows a conventional armor grip type multi-conductor spacer for 6 conductors. This multi-conductor spacer includes an electric wire grip clamp 2 for gripping the element conductor 1, and an armor rod 3 wound around the outer surface of the electric wire grip clamp 2.
And a hexagonal frame 7 for elastically fixing the connecting member 5 via the spring 6, and the connecting member 5 for fixing the electric wire holding clamp 2 with the bolt 4. The electric wire holding clamp 2 is fixed 6 By fixing the individual coupling members 5 to the frame 7 with nuts 8, the element conductors 1 are arranged so as to have a predetermined interval.

FIG. 6 shows an armor rod 3, in which a plurality of armor rods 3 are spirally wound from an electric wire grip clamp 2 to an element conductor 1.

FIG. 7 shows an electric wire gripping clamp 2, which is made of a metal material.
0 and a covering portion 21 in which a gripping portion of an element conductor (not shown) is covered with a semiconductive rubber, and a projection 22 is provided on the surface of the covering portion 21. As shown in FIG. The projection 2 provided on the surface of the covering portion 21 while holding the element conductor 1 by the clamp body 20 covered with the covering portion 21.
2 holds the armor rod 3.

In the multi-conductor spacer having such a structure, when a short-circuit accident or the like occurs in the power transmission line, an accident current is shunted between the conductors from the covering portion 21 of the wire grip clamp 2 and the clamp body 20 through the frame 7. To do. At that time, there is a disadvantage that the coating portion 21 formed of semiconductive rubber is damaged by heat generation due to a large current, and in some cases even the element conductor 1 is damaged.

In order to eliminate this inconvenience, for example, according to a multi-conductor spacer proposed in Japanese Patent Laid-Open No. 6-245357, a clamp body formed by removing a part of the covering portion of the semiconductive rubber layer is disclosed. By directly contacting the armor rod with the exposed part, the fault current is shunted without passing through the semiconductive coating part.

[0008]

However, according to the multi-conductor spacer in which the clamp body is exposed and brought into contact with the armor rod, the contact resistance between the clamp body and the armor rod increases due to aging, so that the accident current is shunted. Then, heat may be generated at that portion and the armor rod and other parts may be damaged. Therefore, it is an object of the present invention to provide a multi-conductor spacer that does not cause damage to the semi-conductive rubber coating material and parts such as the armor rod.

[0009]

SUMMARY OF THE INVENTION According to the present invention, one of a plurality of conductor gripping members is provided with a conductor conductor and a conductor spacing member in order to prevent damage to a semiconductive rubber coating material, an armor rod and other components. There is provided a multi-conductor spacer that is a conductive gripping member that conducts electricity and another conductor gripping member is a non-conductive gripping member that insulates the element conductor from the conductor spacing member.

In the above-mentioned multi-conductor spacer, the conductive holding member has a non-conductive portion for holding the element conductor and a conductive portion provided on the outer surface of the non-conductive portion and electrically connected to the conductor spacing member. However, it is desirable that the conductive portion be connected to the element conductor by an armor rod wound around the outer surface. Further, the non-conductive gripping member may be configured to grip the element conductor via the insulating layer.

[0011]

According to the present invention, at least one of the plurality of conductor gripping members is electrically connected to the element conductor and the conductor spacing member, and the other conductor gripping members are insulated from the element conductor. As a result, even if a fault current flows through one element conductor due to a short circuit accident or the like, it will not be shunted to another element conductor through the multiconductor spacer. Therefore, it is possible to prevent damage to the components forming the multi-conductor spacer due to the flow of a large current. Further, since the element conductor and the conductor spacing holding means have the same potential, the insulator sandwiched between them does not deteriorate due to tracking or the like.

[0012]

First Embodiment A multiconductor spacer of the present invention will be described below with reference to the drawings. The parts having the same configurations and functions as those of the prior art are designated by the same reference numerals, and the duplicate description will be omitted.

FIG. 1 shows a multi-conductor spacer for 6 conductors according to an embodiment of the present invention, in which a conductive frame 7 has an insulating rubber coating clamp 10 having an insulating rubber coating portion 10 at a portion for gripping an electric wire. A conductive wire gripping clamp 12 having an exposed portion 11 in which a part of the metal material is exposed from the insulating rubber coating portion 10 is fixed by a nut 8. 5 out of 6 conductors are insulated wire grip clamps 9
Is held in a state of being insulated from the frame 7, and one conductor is held in a state of being electrically connected to the frame 7 by the conductive wire holding clamp 12.

It is generally considered that a fault current of tens of thousands amperes flows when a short-circuit fault or the like occurs. Therefore, a voltage (about several hundreds of volts) based on the fault current is applied to the covering portion 10, Insulation strength is given to withstand this.

FIG. 2 shows a multi-conductor spacer in which the conductive wire gripping clamp 12 has an exposed portion 11 which is not covered with an insulator.
And an armor rod (not shown) has a covering portion 10 covered with an insulating rubber, and contacts the exposed portion 11. Insulating and conductive wire gripping clamps 9 and 12 are provided with protrusions 14 that engage the armor rods.

FIG. 3 is an enlarged view of the conductive wire gripping clamp 12 in the multi-conductor spacer shown in FIGS. 1 and 2, in which the exposed portion 11 formed integrally with the clamp body 13 made of a metal material is shown. As shown in the sectional view of FIG. 4 taken along the line A-A, it is formed so as to be exposed from the insulating rubber coating portion 10. Further, the exposed portion 11 is provided with an armor rod (not shown). Is provided with a protrusion 14.

According to the multi-conductor spacer having the above structure, the conductive wire gripping clamp 1 which is in conduction with the element conductor 1 is provided.
The frame 7 has the same electric potential as the element conductor 1 by the armor rod 3 (FIG. 4) engaging with the protrusion 14 of the second conductor 2. Here, even if a short circuit accident or the like occurs in the element conductor 1 gripped by the insulating wire gripping clamp 9 and a fault current flows, the insulating wire gripping clamp 9 is covered by the covering portion 10, so that the frame 7 is covered. The fault current does not flow, and therefore propagates in the extension direction of the transmission line without splitting.

Further, even if a short circuit accident or the like occurs in the element conductor 1 held by the conductive wire holding clamp 12, and an accident current flows, the armature rod 3 wound around the element conductor 1 moves the conductive wire holding clamp 12 from the armature rod 3. A conductive path is formed in the clamp body 13 via the exposed portion 11, but since it is insulated from other element conductors 1, no shunt of the fault current occurs. On the other hand, since the frame 7 and the insulative electric wire gripping clamp 9 have the same potential due to the formation of the conductive path, the insulation of the covering portion 10 is not deteriorated.

In the above-described embodiment, the exposed portion 11 in which the metal portion of the clamp body 13 is partially exposed from the coating portion 10 of the conductive wire grip clamp 12 is provided, but as another method, for example, the clamp body is provided. The same effect can be obtained even with an electric wire gripping clamp in which the entire 13 is covered with semiconductive rubber.

The insulating wire gripping clamp 9 is not limited to the structure in which the element conductor 1 and the frame 7 are insulated by the covering portion 10. For example, the coupling member 5 and the frame 7 may be insulated by the insulating member. It is sufficient that the structure can maintain the insulation between the element conductor 1 and the frame 7.

[0021]

As described above, according to the multi-conductor spacer of the present invention, one of the plurality of element conductors is electrically connected to the spacer and the other element conductor is insulated from the spacer. Even if a current flows, the fault current does not flow between the element conductors, and damage to the components that form the multi-conductor spacer can be prevented. Further, since the element conductor and the spacer are made to have the same potential, the insulator for insulating the element conductor and the spacer is not deteriorated.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a multi-conductor spacer according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing an electric wire gripping clamp fixed to a multi-conductor spacer.

FIG. 3 is a front view of an electric wire gripping clamp according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of the electric wire gripping clamp taken along the line AA in FIG.

FIG. 5 is an explanatory diagram showing a conventional multi-conductor spacer.

FIG. 6 is an explanatory view showing a winding state of an armor rod around an element conductor.

FIG. 7 is a front view of a conventional wire gripping clamp.

FIG. 8 is a side view of a conventional wire gripping clamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, Elementary conductor 2, Electric wire gripping clamp 3, Armor rod 4, Bolt 5, Coupling member 6, Spring 7, Frame 8, Nut 9, Insulating wire gripping clamp 10, Cover part 11, Exposed part 12, Conductive wire gripping clamp 13, clamp body 14, protrusion 20, clamp body 21, covering portion 22, protrusion

Claims (3)

[Claims] 1. A plurality of conductor gripping members for respectively gripping the element conductors of a transmission line composed of multiple conductors, and a conductor spacing for arranging the element conductors at predetermined intervals by fixing the plurality of conductor gripping members. In a multi-conductor spacer including a holding member, one of the plurality of conductor holding members is a conductive holding member that conducts the element conductor and the conductor spacing holding member, and another conductor holding member is the element conductor and the element conductor. A multi-conductor spacer, which is a non-conductive holding member that insulates a conductor spacing member. 2. The conductive holding member has a non-conductive portion for holding the element conductor, and a conductive portion provided on an outer surface of the non-conductive portion and electrically connected to the conductor spacing member. The multi-conductor spacer according to claim 1, wherein the conductive portion is connected to the element conductor by an armor rod wound around the outer surface. 3. The multi-conductor spacer according to claim 1, wherein the non-conductive holding member holds the element conductor via an insulating layer.