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Connection portion between power supply DC coaxial cables

A coaxial cable and connecting part technology, applied in the direction of conductive connection, cable installation, connection, etc., can solve the problems of insufficient electromagnetic shielding characteristics, enhanced thermal damage of the main insulation layer, and longer welding operation time, etc., to achieve shortening Connection work time, improvement of connection usability, and effect of reduction in heat generation

Inactive Publication Date: 2013-07-10
FURUKAWA ELECTRIC CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For the return conductor connection of each DC coaxial cable with the same return conductor composition (wire diameter and wire number), although the existing return conductor can be used The method of butt welding the core wires one by one, but the conventional connection method has the following problems: if the number of core wires of the loop conductor is large, the number of welding times will increase, and the welding work time will become longer
[0010] In addition, in the case of soldering the return conductor core wire on the outer semiconductive layer of the cable core or the connection part, the following problems arise: the heat generated during soldering Thermal damage to the outer semiconductive layer and main insulation of the cable, and the outer semiconductive layer and reinforced main insulation of the connection
[0017] If the distance between the core wires of the loop conductor is widened, the following problems will occur: the electromagnetic shielding property is not sufficient
In addition, it can be considered that once a gap is formed between the loop conductor core wires, the flow of current through the adjacent loop conductor core wires almost disappears. Therefore, at the cable connection part, when the current flowing in each loop conductor core wire When the value is unbalanced, the current may be concentrated in some loop conductor core wires, resulting in abnormal heating

Method used

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  • Connection portion between power supply DC coaxial cables
  • Connection portion between power supply DC coaxial cables
  • Connection portion between power supply DC coaxial cables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0064] figure 1 It is a longitudinal sectional view and a partial sectional view of main parts of a DC coaxial cable connection portion for electric power using the loop conductor connection method according to Embodiment 1 of the present invention. The DC coaxial cables A and B to be connected respectively have Figure 17 With the same structure as shown, the anticorrosion layer 10a, 10b, lead cladding 9a, 9b, loop insulator 7a, 7b, outer semiconducting layer 4a, 4b, main insulating layer 3a, 3b are peeled off layer by layer, so that the leading end is exposed. Body 1a, 1b, so that the main conductor 1a, 1b is welded. Reference numeral 21 is a welded portion of the main conductors 1a, 1b. The main conductors 1a, 1b and their solder connections 21 are insulated by a reinforced main insulation layer 22 formed across the main insulation layers 3a, 3b of the two cables. In addition, a buffer layer 23 is provided on the outer semiconductive layer 4a of one DC coaxial cable A, a...

Embodiment approach 2

[0068] Although the above-mentioned first embodiment is the case where the number and wire diameter of the return conductor core wires of the DC coaxial cable to be connected are the same, but for the case where the number and wire diameter of the return conductor core wires are different, the present invention also Connection of loop conductors is possible. image 3It is an explanatory diagram of a connection method when the number and wire diameter of the loop conductor core wires according to Embodiment 2 of the present invention are different. In Embodiment 2, in Embodiment 1, the DC coaxial cable A is replaced with a DC coaxial cable C having a different number and diameter of loop conductor core wires. In addition, since the other configurations are the same as in Embodiment 1, the same parts are given the same reference numerals. In Embodiment 2, the number of core wires constituting each return conductor core wire bundle 24b, 24c is adjusted so that the number of retu...

Embodiment approach 3

[0070] Figure 5 It is an explanatory drawing explaining the loop conductor connection method of Embodiment 3 of this invention. In this connection method, although the loop conductor core wires 12b, 12c of both DC coaxial cables B, C are arranged adjacent to each other to form the loop conductor core wire bundles 24b, 24c, it is different from the above-mentioned Embodiment 2 is the same, but each return conductor core wire bundle 24b, 24c is connected by welding the front ends of both return conductor core wire bundles 24b, 24c to separately prepared relay wire bundles 26, respectively.

[0071] In the method for connecting the loop conductors described above, compared with the case of directly welding the loop conductor core strands of the DC coaxial cables B and C, it is easier to adjust the welding position of the front end of the loop conductor core strands. In addition, when the configuration (wire diameter and number of wires) of the loop conductor core wire harness t...

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Abstract

A return-conductor connecting method is for a power direct-current coaxial cable that includes a main conductor at the center, a main insulating layer around the main conductor, and a return conductor that is formed by coaxially stranding a plurality of return-conductor wires around the main insulating layer, in a connecting portion between power direct-current coaxial cables. The return-conductor connecting method includes forming a return-conductor wire bundle by placing a plurality of return-conductor wires next to each other for each of the power direct-current coaxial cables; and welding return-conductor wire bundles of the power direct-current coaxial cables in a butt jointing manner. With this configuration, a method of connecting a return conductor of a direct-current coaxial cable can be provided with which an operation time for welding return-conductor wires can be shortened and which can be applied to a connection of the return conductor between direct-current coaxial cables having different numbers of return-conductor wires.

Description

technical field [0001] The present invention relates to a connection method of a return conductor on a connection portion between power coaxial cables having a return conductor coaxial with a central main conductor, and a connection portion of a DC coaxial cable for power. Background technique [0002] Figure 17 An example of a DC coaxial cable for electric power is shown. The center of the DC coaxial cable A has a main conductor 1, and its outer side is sequentially coaxially provided with an inner semiconducting layer 2, a main insulating layer 3, an outer semiconducting layer 4, a loop conductor 5, a loop inner semiconducting layer 6, and loop insulation Layer 7, circuit outer semiconductive layer 8, lead cladding 9 and anti-corrosion layer 10 (referring to patent document 1 figure 1 ). [0003] The main conductor 1 to the outer semiconducting layer 4 constitute a cable core 11 . The return conductor 5 is formed by concentrically stranding a plurality of return-condu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R9/05
CPCH01R4/021B23K31/02H02G15/085B23K2201/38H01R9/0503B23K2101/38H01R4/02
Inventor 水野健彦川上真一
Owner FURUKAWA ELECTRIC CO LTD