JPS6031371Y2 - Pipeline aerial cable connection - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connection part for facilitating the installation of a long-distance twisted aerial cable line on a conduit aerial cable.

Conventionally, conduit aerial power transmission lines have adopted a solid bond method in which both ends of the cable sheath are grounded to prevent induction disturbances.

According to this method, the magnetic field generated by the conductor current is canceled out by the sheath current with the opposite phase, so there is almost no interference caused by electromagnetic induction, but the sheath circuit loss due to the sheath current becomes extremely large, so long distances are required. In the case of a power transmission line or a line laid in a tunnel, it is not suitable for such a line because a large amount of construction cost is required for cooling equipment in the tunnel.

For this reason, in aerial cable lines laid in long-distance tunnels, cross bonding, which is conventionally used in OF cable lines, connects the sheath with the sheath of the other phase by electrically cutting the sheath at certain sections at the cable connection point. method is used.

According to this method, since almost no current flows through the cable sheath, sheath circuit loss is reduced, but electromagnetic induction interference caused by conductor current poses a major problem.

For this reason, in long-distance conduit aerial cable lines that use the cross-bond method, twisted cables are used to change the positional relationship of each phase cable conductor in each fixed section and use the phase difference of each phase conductor current to cancel the induced voltage. It is necessary to use a combination of laying methods.

However, since conduit aerial cables are not flexible, in order to lay them by twisting, the twisting and bending sections are manufactured in advance at the factory, and the bending sections are installed for each phase at the installation site. It is necessary to connect the cables by twisting the cables, which requires various production costs and a long time to install.
In addition, the recently proposed visible air conduit cable using a corrugated metal sheath has a large outer diameter and high bending rigidity, making it extremely difficult to twist and lay it in a narrow space inside a sinus. There were some problems.

The present invention was developed in consideration of the above points, and an embodiment of the present invention will be explained below with reference to the drawings. 1. 2. 3 are plate-shaped connection conductors made of copper or aluminum, and 4 is a non-conductor made of stainless steel, aluminum, etc. A connection case made of magnetic metal, and inside the connection case 4, as shown in the figure, there is a cable conductor R4 to be connected.
A connecting conductor 1.2 arranged diagonally so that the arrangement of S and T is twisted and twisted as specified at the connection part, and the conductors 1, 2.
Connecting conductors 3 are installed across the respective insulating spacers 5, and the terminals of the connecting conductors 1.2.3 and the terminals of the cable conductors R, S, and T are connected by insertion or soldering, etc. as appropriate. connected in a certain way.

The cable sheath 6 and the cylindrical portion 4a protruding in parallel from the side surface of the connection case 4 may be connected via an insulating joint 7 or directly to provide mutual ventilation, or in some cases, the cylindrical portion 4a protruding from the side surface of the connection case 4 may be A conductor support spacer 8 made of an insulating material that also serves as a gas stop is provided in the cable sheath to block the gas passage between the connection case 4 and the cable sheath 6, and the connection case 4 is filled with an insulating gas different from the gas in the cable sheath, or The filling gas pressure may be changed.

According to the present invention, as described above, a cable is connected to the terminal of each connecting conductor 1, 2.3 arranged in such a way that the arrangement position of each phase conductor of the cable is changed by twisting, through an insulating spacer 5 in a connecting case 4. By simply connecting each phase conductor in sequence, the arrangement position of each phase conductor of the cable to be laid can be easily changed for each fixed section. If the connecting case 4 used is manufactured in the factory, the width of the case 4 can be reduced, and it has excellent advantages such as being extremely effective for twisting and laying cables in tunnels where the installation space is narrow, and the work can be done easily and quickly. There is.

Although one embodiment of the present invention has been described above, the present invention is not limited to this, and it goes without saying that the design may be modified as appropriate within the gist of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing one embodiment of the present invention;
The figure is a side view. 1: Connection conductor, 2: Connection conductor, 3: Connection conductor, 4: Connection case, 5: Insulating spacer, 6: Cable sheath.

Claims (1)

[Scope of utility model registration request] Connecting conductors 1 and 2 are arranged in a connecting case 4 via an insulating spacer 5 so that the arrangement of each phase conductor of both cables to be connected is twisted as per a predetermined manner, and the connecting conductors 1 and 2 are straddled. A connecting part of a conduit aerial cable, characterized in that each phase conductor of the cable is twisted and connected to each terminal part of a connecting conductor 3 installed in the above.