JPH069335U - Structure for attaching electric wire accessories to the conductor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a structure for attaching an armor grip type electric wire accessory to a conductor, which eliminates the risk of conductor melting damage and disconnection due to short-circuit current. [Structure] At least a contact portion of an inner surface portion 3 of an elastic body layer 2 provided on the inner and outer surfaces of a metal core body 1 connected to a main body portion 7 of an electric wire accessory with an electric insulating elastic body layer. 2A, and the outer surface portion 4 on which the spiral metal rod 5 is wound and in contact with each other is the semiconductive elastic body layer 2B. The short-circuit current at the time of inter-phase short circuit flows from the metal core 1 to the outer surface portion 4 having a relatively small electric resistance in the elastic layer 2 portion, and flows to the spiral metal rod 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for attaching electric wire accessories to a conductor for attaching and fixing electric wire accessories such as spacers and dampers to a conductor of a transmission line, and particularly to an AG (armor grip) type attachment structure.

[0002]

[Prior art]

 A boltless type of so-called AG type is known as one of the structures for attaching and fixing electric wire accessories such as spacers and dampers to the conductor. As is well known, this AG-type mounting structure covers the inner and outer surfaces of a metal core with a substantially semicircular cross section that is connected to the main body of wire accessories such as spacers and dampers with an elastic layer such as rubber. At the same time, the groove of the inner surface that curves along the metal core of the elastic layer is fitted to the conductor of the power transmission line, while the spiral metal rod is attached along the metal core of the elastic layer. This structure has a spiral winding around the curved outer surface and the outer circumferences of the conductors located on both sides of the curved outer surface. According to such an AG-type mounting structure, the elastic body layer is fitted on the conductor and spirally wound. Due to the elastic tightening force of the metal rod, the electric wire accessories such as spacers and dampers are attached in a mechanically good condition without causing damage due to stress concentration on the conductor part of the attachment point. Something that can be fixed That.

[0003]

[Problems to be solved by the device]

 However, the above-mentioned conventional AG type mounting structure has the following problems. That is, vibrations such as galloping and three-jump occur in the conductor of the transmission line in which the electric wire accessories such as spacers and dampers are attached and fixed by adopting the AG type mounting structure, and the main body part of the electric wire accessories ( When the body rod of the spacer or the weight of the damper, which is connected to the metal core, comes into contact with the transmission line conductor of another phase to cause an interphase short circuit, the current of the transmission line conductor of the other phase is It may flow from the main body of wire accessories to the metal core body to the elastic layer to the conductor of the transmission line fitted to it, and in such a case, the metal core body and conductor An arc may fly between and, which may melt the conductor.

An object of the present invention is to provide a novel structure for attaching electric wire accessories to a conductor, which solves the above problems.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the attachment structure of the electric wire accessory to the conductor of the present invention, the elastic body provided on the inner and outer surfaces of the metal core body connected to the main body of the electric wire accessory. At least the contact portion of the inner surface of the layer with the conductor was an electrically insulating elastic layer, and the outer surface of the spiral metal rod wound and in contact was a semiconductive elastic layer.

[0006]

[Action]

 The short-circuit current when a phase-to-phase short circuit occurs is as follows: Main body of wire accessories → Metal core → Inner surface (electrically insulating elastic body layer) Conductive elastic layer) → flows to the spiral metal rod that is wound around and in contact with the surface of the outer surface portion.

[0007]

【Example】

 1 and 2 show a first embodiment of a structure for attaching electric wire accessories to a conductor according to the present invention, in which a proximal end portion 6 side is a main body portion 7 of electric wire accessories (for example, a body of a spacer). An elastic body layer 2 made of rubber or the like having a constant thickness is provided on the inner and outer surfaces of a metal core 1 having a substantially semicircular cross section which is connected to a rod or the like). The inner surface portion 3 of the elastic body layer 2 that curves along the metal core body 1 has an entire thickness as an electrically insulating elastic body layer 2A such as chloroprene rubber, and also curves along the metal core body 1. The outer surface portion 4 is a semiconductive elastic layer 2B such as chloroprene rubber mixed with carbon powder, and the electrically insulating elastic layer 2A and the semiconductive elastic layer 2B are fused at their contact surfaces. It is integrated. The inner surface portion 3 of the elastic layer 2, that is, the groove portion of the electrically insulating elastic layer 2A is fitted to the conductor W of the power transmission line, and as shown in FIG. A spiral metal rod 5 is spirally wound around the surface of the semiconductive elastic body layer 2B and the outer periphery of the conductor W on both sides thereof, and thus the attachment structure of the electric wire accessory of the present invention to the conductor is formed. It is configured.

FIG. 3 shows a second embodiment of the present invention, in which, of the wall thicknesses of the inner surface portion 3 of the elastic layer 2, about half the thickness on the side in contact with the conductor W is used. Is an electrically insulating elastic layer 2A such as chloroprene gum, and the thickness of the remaining half on the side in contact with the metal core 1 is the same semiconductive elastic layer 2B as that of the outer surface portion 1B. Although different from the example, the other configurations are the same as those in the first embodiment.

FIG. 4 shows a third embodiment of the present invention, in which the electrically insulating elastic layer 2A of the inner surface portion 3 of the elastic layer 2 is the same as in the first and second embodiments. In the point that it is interposed between the semiconductive elastic layer 2B and the conductor W as a sheet-shaped inclusion having a constant thickness without being fused and integrated with the semiconductive elastic layer 2B. Although different from the first and second embodiments, other configurations are the same as those of the first and second embodiments.

[0010]

[Effect of device]

 According to the structure for attaching the electric wire accessories to the conductor according to the present invention, the following effects can be obtained. In the elastic layer 2 on the surface of the metal core body 1, the inner surface part 3 in which at least the contact portion with the conductor W is the electrically insulating elastic layer 2A, and the entire thickness thereof is the semiconductive elastic layer 2B. Since the electrical resistance of the outer surface portion 4 is relatively smaller than that of the outer surface portion 4, the short-circuit current flowing to the metal core 1 through the body portion 7 of the wire accessories during the inter-phase short circuit is generated by the elastic layer 2 In the portion, it flows toward the outer surface portion 4 having a low electric resistance, and flows in a distributed manner to each spiral metal rod 5 which is wound around and contacts the surface of the outer surface portion 4. Therefore, the arc no longer flies between the metal core 1 and the conductor W as in the conventional case, and the risk of melting or breaking of the conductor W can be reliably eliminated.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of a structure for attaching electric wire accessories to a conductor according to the present invention.

FIG. 2 is a plan view of the first embodiment shown in FIG.

FIG. 3 is a partially cutaway front view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 4 is a partially cutaway front view corresponding to FIG. 1 showing a third embodiment of the present invention.

[Explanation of symbols]

 1 Metal Core 2 Elastic Layer 2A Electrical Insulation Elastic Layer 2B Semiconductive Elastic Layer 3 Inner Surface Part 4 Outer Surface Part 5 Spiral Metal Rod, W Conductor

Claims (3)

[Scope of utility model registration request] 1. An elastic body layer (2) is provided on inner and outer surfaces of a metal core body (1) having a substantially semicircular cross section, and the elastic body layer (2) is provided.
The conductor (W) is fitted in the groove of the inner surface portion (3) that curves along the metal core body (1), and also curves along the metal core body (1) of the elastic layer (2). In the attachment structure of the electric wire accessories to the conductor, the spiral metal rod (5) is spirally wound around the surface of the outer surface part (4) and the outer circumferences of the conductors (W) located on both sides thereof. At least a contact portion of the inner surface portion (3) of the body layer (2) with the conductor (W) is an electrically insulating elastic body layer (2A), and an outer surface portion (4) is a semiconductive elastic body layer (2B). A structure for attaching electric wire accessories to a conductor, which is characterized in that 2. A structure for attaching an electric wire accessory to a conductor according to claim 1, wherein the electrically insulating elastic layer (2A) and the semiconductive elastic layer (2B) are fused and integrated at a contact surface between them. 3. A structure for attaching electric wire accessories to a conductor according to claim 1, wherein the electrically insulating elastic layer (2A) is a sheet-like inclusion having a constant thickness.