JPH07192538A - High inductance cable - Google Patents

Abstract

(57) [Summary] [Construction] An inner insulator 2 is provided on the outer periphery of the messenger wire 1, and a conductor 3 is wound around the outer periphery of the inner insulator 2 in a spiral shape at a predetermined pitch. The outer insulator 4 is provided on the outer side of the conductor 3 so as to fill the gap between the spirally wound conductors 3. A shielding layer 5 and a protective coating layer 6 are provided outside the outer insulator 4. [Effect] Since the conductor is wound around the inner insulator in a so-called coil shape, it is possible to obtain a higher inductance value than the inductance cable in which the conductor is linearly arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high inductance cable, and more particularly to a high inductance cable which exhibits a high inductance in an electric circuit.

[0002]

2. Description of the Related Art Generally, when high inductance is required in an electric circuit, the self-inductance of an electric cable is used.

[0003]

By the way, since the magnitude of the self-inductance of such an electric cable depends on the cable length of the electric cable, when a large inductance is required, a long electric cable is required. Therefore, the method using the self-inductance of the electric cable has a drawback that it requires a vast installation space for laying the electric cable.

The present invention has been made to solve such a problem, and an object thereof is to provide a high-inductance cable which can obtain a high inductance and does not require a vast installation space.

[0005]

In the high inductance cable of the present invention, a conductor is spirally wound around the outer periphery of an insulator provided on the outer periphery of a messenger wire, and a rubber or plastic coating layer is provided on the outer side thereof. It is characterized by

[0006]

In the high-inductance cable of the present invention, since the conductor is wound in a coil shape on the outer periphery of the insulator provided on the outer periphery of the messenger wire, the inductance cable in which the conductor is linearly arranged is used. It is possible to obtain a higher inductance than that.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of the high-inductance cable of the present invention, and FIG. 2 is a side view showing a state in which the high-inductance shield layer and protective coating layer shown in FIG. 1 are omitted. . 1 and 2, the reference numeral 1 is
The figure shows a messenger wire made of galvanized steel stranded wire.
An internal insulator 2 formed by extrusion coating of crosslinked polyethylene or polyethylene resin is provided. The material for forming the inner insulator 2 is determined by the voltage class in which this high inductance cable is used. here,
The inner insulator 2 is provided by the messenger wire 1.
This is to prevent electric discharge between the conductors 3 described later. That is, if the inner insulator 2 is not provided on the outer periphery of the messenger wire 1, air discharge may occur between the adjacent spirally wound conductors 3. Therefore, in order to prevent the occurrence of such air discharge, the gap between the conductors 3 is filled with the internal insulator 2 having a higher dielectric strength than air.

On the outer circumference of the inner insulator 2, conductors 3 made of tin-plated annealed copper wire or the like are arranged at a predetermined pitch.
It is wound in a spiral shape, and an outer insulator 4 formed by extrusion coating of crosslinked polyethylene or polyethylene resin is provided on the outer side of the spiral wound conductor 3 so as to fill the gap between the spirally wound conductors 3. ing. The number of turns and the spiral pitch of the conductor 3 are determined by the value of the inductance required in the electric circuit. An insulating layer 3a formed by extrusion coating of cross-linked polyethylene or polyethylene resin may be provided on the outer periphery of the conductor 2 if necessary.

However, on the outside of the outer insulator 4,
A shielding layer 5 formed of a wound layer of tin-plated annealed copper tape and a protective coating layer 6 formed by extrusion coating of flame-retardant vinyl resin are provided.

In the high-inductance cable having such a structure, since the conductor is wound around the inner insulator in a coil shape, the inductance value is higher than that of the inductance cable in which the conductor is linearly arranged. Can be obtained. Therefore, in the case where the same reactance capacity is required in the electric circuit, the high-inductance cable of the present invention can be made shorter than the inductance cable in which the conductors are linearly arranged, and There is an advantage that the installation space for such a cable can be reduced.

In the above-described embodiment, the case where the single conductor 3 is spirally wound around the outer periphery of the inner insulator 4 is described, but the present invention is not limited to this and the outer periphery of the inner insulator 4 is described. Alternatively, the plurality of conductors 3 may be spirally wound at predetermined intervals.

[0013]

As described above, in the high-inductance cable of the present invention, a higher inductance value can be obtained than in the conventional inductance cable in which conductors are arranged in a straight line. In an electric circuit requiring a reactance capacity, the cable can be made shorter, and the installation space for such an inductance cable can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a high-inductance cable of the present invention.

FIG. 2 is a perspective view showing a semi-finished product of the high inductance cable shown in FIG.

[Explanation of symbols]

 1 ………… Messenger wire 2 ……… Inner insulator 3 ……… Conductor 4 ……… Outer insulator 5 ……… Shielding layer 6 ……… Protective coating layer

Claims (1)

[Claims] 1. A high-inductance cable characterized in that a conductor is spirally wound around the outer periphery of an insulator provided on the outer periphery of a messenger wire, and a rubber or plastic coating layer is provided on the outer side of the conductor.