JPS5856676B2 - How to connect aluminum conductor OF cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductor containing aluminum as a main component (hereinafter abbreviated as an aluminum conductor).

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As the use of aluminum conductor OF cables has increased in recent years, various connection methods have been studied.

There are various connection methods for connecting aluminum conductors, such as compression connection, soldering connection, and welding connection, but welding connection has the best electrical connection performance.

However, in the welded connection of OF cables, oil flows out from the conductor to the welded portion, which poses a major obstacle to the welding work.

Also, once welded, securing an oil passage becomes a problem.

In view of this situation, the present invention aims to provide a simple and reliable method for connecting aluminum conductor OF cables.

The configuration of the method of the present invention will be specifically explained with reference to the drawings showing one embodiment.

First, as shown in FIG. 1, the conductor portion of the OF cable is exposed, a metal tube 3 is inserted into the oil passage 2 in the aluminum conductor 1, and a closed metal tube 4 is provided.

There is no problem whether the metal tube 3 and the closed metal tube 4 are integrated or separate, but the metal tube 3 is made of strong pressure-resistant steel, for example, and the closed metal tube 4 has a high processing capacity. For example, brass, copper,
Preferably, it is made of aluminum or the like.

Then, the end face of the aluminum conductor 1 is pre-welded 5.

Next, as shown in FIG. 2, the aluminum conductors 1 are butted together and main welding 6 is performed.

At this time, the end face of the conductor is oil-tightened by the preliminary welding 5, and the oil passage 2 is also closed by the closed metal tube 4, so that the welding is not interfered with by oil during the main welding.

Oil will come out during preliminary welding, but since the purpose of preliminary welding is to stop oil and not to connect cables, it is not very difficult to do so, for example by turning the end face upward.

In some cases, preliminary welding may be replaced by packing between the stranded conductors.

Thereafter, as shown in FIG. 3, a hole 7 is made using a drill or the like to connect the oil passage 2.

At this time, it is desirable to open the hole 7 from the bottom side during work.

In other words, this is to make it easier for debris from the drilling work to flow out.

Note that by compressing the conductor from above the metal tube 3 during welding, the oil-stopping effect can be improved.

At this time as well, since the metal g3 is made of a sturdy material such as steel, the oil passage 2 will not be crushed.

Furthermore, by configuring the closed metal tubes 4 so that they fit into each other, there is no fear of misalignment during connection.

According to the method of the present invention, the following remarkable effects are achieved.

α) Excellent electrical connection performance due to welded connection.

(2) Since a closed metal pipe is used, it is possible to prevent oil from flowing into the welded area, and after welding, an electric oil passage can be secured by drilling holes.

(3) When making welded connections, there is almost no oil flowing into the welded parts, so welding connections can be easily made.

[Brief explanation of the drawing]

1 to 3 are process explanatory diagrams of one embodiment of the method of the present invention. 1... Aluminum conductor, 2... Oil passage, 3
...Metal pipe, 4...Closed metal pipe, 5.
...Preliminary welding, 6...Main welding, 7...
···hole.

Claims (1)

[Claims] 1. In the method of connecting an OF cable with an aluminum conductor, the aluminum conductor of the OF cable is exposed, a closed metal pipe is provided in the oil passage in the aluminum conductor, the end face of the aluminum conductor is pre-welded, and such an aluminum conductor is A method for connecting an aluminum conductor OF cable, characterized by welding the butt parts and making a hole in the closed part of a closed metal pipe previously provided in the oil passage to secure an oil passage.