JPH022030Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a multi-core cable termination section useful for supplying three-phase power into electrical equipment to which a DC high voltage is applied.

[Technical background of the invention and its problems] Recently, electrical equipment with DC potential, such as tandem accelerators, has been actively developed. Insulated cable ends should be used.

Conventionally, three-phase power is supplied to such DC electrical equipment by using three single-core cables.

However, in such a power supply method, installation work must be performed for each cable, which is complicated, and there are also disadvantages in that DC insulation must be applied to each cable. Furthermore, it requires a large amount of installation space, which is economically disadvantageous.

[Purpose of the invention] The present invention has been made in response to the above-mentioned conventional circumstances, and it is an object of the present invention to provide a multi-core cable termination section that can easily and inexpensively supply three-phase power to electrical equipment having a DC potential. The purpose is

[Summary of the invention] In other words, the multi-core cable termination section of the present invention includes a semi-conducting layer provided on a twisted body of a plurality of insulated wire cores and a semi-conducting wire core, and a main insulating layer and a shielding layer sequentially formed on the semi-conducting layer. and a terminal part of a multi-core cable provided with a sheath,
At the end of the multi-core cable, which is covered with a mantle from which a conductor pull-out body is drawn out from the center of the top, the conductor pull-out body is placed between an insulating cylinder whose top end is closed and the inner periphery of this insulating cylinder at a predetermined distance. A plurality of arranged electrode bodies, one end of each of which is electrically connected to each electrode body while maintaining mutual insulation, and the other end of which is pulled out upward from the closed part of the insulating tube. Each conductor of the insulated wire core and the semi-conducting wire core is connected to the corresponding electrode body of the conductor lead-out body in a state in which the conductors of the insulated wire core and the semiconducting wire core are respectively connected to each other while maintaining insulation from each other. , the end portion of the shielding layer is characterized in that the electric field is relaxed by a stress cone attached to the outer periphery of the main insulating layer.

[Embodiment of the invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

First, in this invention, the first
A multi-core cable 1 shown in the figure is used. As shown in the figure, the multi-core cable 1 has three insulated wire cores 2a,
A semiconducting layer 5 is provided on a twisted body 4 of 2b, 2c and a semiconducting wire core 3 serving as a neutral wire, and a main insulating layer 6, an external semiconducting layer 7, a shielding layer 8, and It is configured with a sheath 9. Each of the above-mentioned insulated wire cores 2a, 2b, 2c has conductors 21a, 21
Insulators 22a, 22b, and 22c are coated on the conductors 31 and 21c, and the semiconducting wire core 3 is configured so that the conductor 31 is coated with the semiconductor 32. It is preferable that each of the insulated wire cores 2a to 2c and the semiconductive wire core 3 have a 90° fan shape in cross section. This is because the finished outer diameter when each wire core is twisted can be made smaller.

Next, the formation of the multi-core cable termination section according to the present invention will be explained using FIGS. 2 to 4.

As shown in FIG. 2, the terminal portion of the multi-core cable 1 which has been subjected to step-stripping treatment is covered with a sleeve 12 made of epoxy resin or the like with a conductor lead-out body 11 drawn out from the center of the top portion 10. The conductors 21a to 21c and 31 of each core constituting the multi-core cable are electrically connected to the conductor lead-out body 11 in the following manner while maintaining mutual insulation between these cores.

That is, as shown in FIGS. 3 and 4, the conductor lead-out body 11 has ring-shaped electrode bodies 41a to 41c and 4 at predetermined intervals on its inner periphery.
2 is arranged and has a closing part 15 at the upper end.
6, and one end is each electrode body 41a to 41c and 42
A plurality of insulated lead wires 17a to 17a are electrically connected to each other while maintaining mutual insulation, and the other end passes through the insulating tube 16 and is drawn upward from the closing part 15.
17c and 18.

On the other hand, each wire core 2a to 2c and the conductor 21a of 3
The terminals of ~21c and 31 are electrically connected to connection conductor rods 19a~19c and 20 coated with an insulator, and these connection conductor rods 19a~
19c and 20 are electrically fixed to cylindrical or columnar conductive plugs 51a to 51c and 52 by, for example, silver brazing.

The above-mentioned connecting conductor rod is inserted into the plug and connected to a predetermined plug, for example, the connecting conductor rod 1
9a is electrically fixed to the plug 51a by passing through the plug 52, 51c and 51b, and the plug 52 is electrically fixed to the plug 51a.
The connecting conductor rods 19a to 19c are inserted through and connected to the connecting conductor rod 20.

Further, insulating spacers 53a to 53a to insulate each plug are provided between each plug 51a to 51c and 52.
53c and 54 are sandwiched.

When such plugs are inserted into the insulating cylinder 16 in a so-called slip-on manner, each of the plugs 51a to 51c and 52 connects to the connectors 55a to 55.
are connected to corresponding ring-shaped electrode bodies 41a to 41c and 42 via c and 56, respectively. Note that the connection between the plug and the electrode body is not limited to a slip-on connection, but may be a permanent connection.

Next, as shown in Fig. 2, the multi-core cable 1
The electric field is relaxed at the end of the shielding layer 8 on the main insulating layer 6 by a stress cone 201 attached to the outer periphery of the main insulating layer. In FIG. 2, reference numeral 202 indicates a shield ring, 203 a lock nut, 204 a fixing fitting, 205 a push pipe, and 206 a protective fitting.

[Effect of the invention] As explained above, according to the multi-core cable termination section of the invention, a three-phase cable is used as a cable for supplying three-phase power to electrical equipment having a DC potential, and the conductor of each core is are electrically connected to the corresponding electrode bodies of the conductor lead-out body while maintaining mutual insulation, and the electric field relaxation at the end of the shielding layer is handled by a stress cone attached to the outer periphery of the main insulating layer. Phase power can be supplied with a single multi-core cable.

Therefore, compared to the conventional power supply method using three single-core cables, the present invention simplifies the installation work because only one cable needs to be installed. Since the DC insulation for the cores is collectively insulated by the main insulation layer on the twisted body of these wire cores, the installation space can be reduced and the cost can be reduced compared to conventional methods.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the multi-core cable used in the present invention, Fig. 2 is a partially cutaway sectional view of the terminal end of the multi-core cable according to the present invention, and Fig. 3 is a cross-sectional view of the conductor pull-out body and each core. Vertical sectional view showing the connection status, No. 4
The figure is a vertical cross-sectional perspective view of the main part of FIG. 3. 1...Multi-core cable, 2a to 2c...Insulated wire core, 3...Semiconducting wire core, 6...Main insulation layer, 8...
Shielding layer, 11... Conductor drawer, 12... Mantle, 2
01...Stress cone.

Claims (1)

[Scope of utility model registration request] A semiconducting layer is provided on a twisted body of a plurality of insulated wire cores and a semiconducting wire core, and a main insulating layer, a shielding layer, and a sheath are sequentially provided on this. At the end of a multi-core cable, which is covered with a sleeve with a conductor drawn out from the center,
The conductor lead-out body includes an insulating tube whose top end is closed, a plurality of electrode bodies arranged at predetermined intervals on the inner periphery of the insulating tube, and one end of each of which maintains insulation from each other. and a plurality of insulated lead wires whose other ends are drawn upward from the closed portion of the insulating cylinder, and the insulated lead wires are electrically connected to each other in a state in which Each conductor of the wire core and the semiconducting wire core is connected in a corresponding manner while maintaining mutual insulation, and the electric field is relaxed at the end of the shielding layer by a stress cone attached to the outer periphery of the main insulating layer. A multi-core cable termination section featuring