JPH0130244B2 - - Google Patents

Description

[Detailed description of the invention]

[Object of the Invention] (Industrial Application Field) The present invention relates to an improvement in a high frequency low impedance electric line used in a three-layer high frequency power circuit. (Prior art) Electrical lines used in power circuits in the high frequency range, which are ten times or several tens of times higher than the commercial frequency, have extremely large reactances, resulting in large voltage drops in the electric lines, and the voltage drop between the phases. A balance will emerge. As a means to solve such problems, (a) Increase the conductor size. (b) Use a coaxial cable. (c) Use many small size cables connected in parallel. Possible methods include: (Problems to be Solved by the Invention) However, in method (a), although the resistance component is reduced, the reactance component is hardly reduced and the effect is small. In method (b), there are many cable manufacturing steps, resulting in low productivity and complicated cable terminal processing. Furthermore, there is a drawback that the impedance of the three layers becomes unbalanced. Method (c) had the disadvantage that a large installation space was required to maximize the effect. Further, Japanese Utility Model Application Publication No. 53-115389 discloses a cable having a structure in which three-phase insulated wire cores are arranged in six strips on the circumference. In a cable having such a structure, each phase of the insulated wire core is arranged in an electrically balanced position, so that induction interference with other cables and the like is no longer caused. However, in such a structure, if the number of insulated wire cores is increased, twisting becomes impossible, so it is difficult to increase the number of insulated wire cores any more, and therefore the effect of reducing the reactance component is small. As described above, conventional methods have not provided an effective solution for electric lines used in high-frequency power circuits. (Purpose) The present invention was made in order to eliminate such conventional drawbacks, and is a high-frequency low-impedance electric wire that can be used in high-frequency power circuits without any inconvenience, is easy to produce and process terminals, and does not require a particularly large installation space. The purpose is to provide a route. (Means for Solving the Problems) In order to achieve the above object, the present invention provides protection on the outer periphery of a cable core constituted by a plurality of sets of three-phase units R, S, and T each consisting of three insulated wire cores 1. In the electric wire line provided with the sheath 2, the cable core has a multi-layer twisted structure in which each layer is made up of insulated wire cores 1 having an integral multiple of 3, and each layer has three adjacent insulated wire cores 1 that provide three phases each. It is characterized by comprising units R, S, and T, and furthermore, these insulated wire cores are twisted with each layer having a different twisting direction. (Function) As described above, in the present invention, the three-phase balance of the cable core is properly maintained, and there is no risk of inductive disturbance to adjacent cables, etc., and the reactance of the line is calculated as follows, assuming the number of insulated wire cores is N: The voltage drop rate is approximately 1/(N/3) of the case where each phase is configured with one insulated wire core, and the voltage drop rate is also reduced. Furthermore, since it is composed of multiple cores, it has better productivity, terminal workability, and wiring workability than coaxial high-frequency low-impedance electric wires or large-sized conductor cables, and does not require a large installation space. (Example) The details of the present invention will be described below based on an example shown in the drawings. In the embodiment shown in FIG. 1, three insulated wire cores 1 constituting a three-phase unit are arranged side by side on the same circumference, and the three-phase unit R ₁ , S ₁ , T ₁ , R ₂ , S ₂ ,
Two sets of T ₂ are twisted together so that each insulated wire core 1 is arranged on the minimum circumference to constitute the first layer. Moreover, on the first layer, four sets of three-phase units R ₃ ,
S ₃ , T ₃ to R ₆ , S ₆ , and T ₆ are twisted in the opposite direction to the twisting direction of the first layer to form the second layer. On this second layer are six three-phase units R ₇ , S ₇ , T ₇ to R ₁₂ ,
S ₁₂ and T ₁₂ are twisted in the same direction as that of the first layer, and with a twist pitch different from that of the first layer (any size is fine), and are twisted together to form the third layer. ing. The electrical characteristics of a cable having the twist type shown in this example and the dimensions shown in Table 1 are shown in Table 2.

【table】

【table】

[Table] ¹² 1 ¹² 1
Σ

Claims (1)

[Claims] 1 3-phase unit R consisting of 3 insulated wire cores 1,
In an electric line in which a protective coating 2 is provided around the outer periphery of a cable core composed of multiple sets of S and T,
The cable core has a multilayer twisted structure in which each layer is composed of insulated wire cores 1 having an integral multiple of 3, and each layer has three adjacent insulated wire cores 1 to form each three-phase unit R,
A high frequency impedance electric line comprising S and T, and further comprising these insulated wire cores twisted in different directions in each layer.