JPH03102792A - Connection method for element wire insulated conductor - Google Patents

Abstract

PURPOSE:To save labor in connection works and enable sparing the time by applying Ag solder fillet to the connection ends of an element wire insulated conductor, fixing compressedly an inner sleeve to each connection end, screw fitting an outer sleeve on the inner sleeve, and tightening this outer sleeve. CONSTITUTION:Ag solder fillet is formed at each connection end of two element wire insulated conductors 1', 1 to be connected, so as to form end parts 4', 4, and an inner sleeve 5' equipped with rightwise thread 5'b on the peripheral surface is secured compressedly to one of these connection ends while another inner sleeve 5 provided with leftwise thread 5b on the periphery is fixed compressedly to the other connection end. An outer sleeve 6 equipped with inside threads 6'b, 6b to be screw engagement with the mentioned threads 5'b, 5b is screw fitted with the threads 5'b, 5b of the inner sleeves 5', 5. Then this outer sleeve 6 is tightened. Accordingly the two element wire insulated conductors 1', 1 are drawn toward each other by this tightening, and their terminal parts 4', 4 are put in pressure contact closely to accomplish electric continuity. This saves labor and time for connection works.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for connecting strand insulated conductors for connecting strand insulated conductors. (Conventional technology) In recent years, as power transmission capacity increases, the conductor size of power cables continues to increase in size, and split conductors are being used to reduce the skin effect in conductors. However, as the size of conductors continues to increase, the problem of skin effect in divided segments has become more prominent even in divided conductors. Therefore, it has been considered that each wire in a segment can be made into an insulated wire by coating the surface of the conductor wire with an insulating layer such as an enamel coating or an oxide film, thereby making it an insulated wire conductor. It has come to be put into practical use. Thus, the connection between the segments is made at the cable connection part, and conventionally this connection is made as follows. That is, as shown in FIG. 3, at the connecting ends of both segments l and 1' to be connected,
The 2' spaces are once opened apart by hand, and the insulation coating of the insulated wire is completely stripped off using sandblasting, etc. Thereafter, as shown in FIG. 4, a predetermined connecting sleeve 3 is used to compress and connect the segments 1 and 1'. (Problems to be Solved by the Invention) In the conventional connection method described above, the insulated wires are first separated and then put together and compressed and connected using a sleeve, which requires a lot of work. It requires time. Furthermore, it takes a considerable amount of time to completely strip the insulation coating of each insulated wire. Additionally, equipment for sandblasting must be prepared. The present invention has been made based on the above circumstances, and is labor-saving.
The purpose of this paper is to provide a method for connecting strands of insulated conductors that saves time and does not require special equipment. [Structure of the Invention] (Means for Solving the Problems) The method for connecting strand insulated conductors of the present invention is to apply silver solder to the connection end of the pixel line insulated conductors to be connected and to connect each strand insulated conductor. A step of configuring a terminal portion for electrically connecting end surfaces of the insulated wires to be formed, and providing a right-handed thread portion on the outer peripheral surface of one of the connection ends of the two wire insulated conductors to be connected. A step of compressing and fixing an inner sleeve and an inner sleeve having a left-hand thread on the outer peripheral surface thereof, respectively, and an outer sleeve having an inner thread that threads into the right-hand thread and the left-hand thread. The method is characterized in that the steps of threading the sleeve into the threaded portion of each of the inner sleeves and tightening the outer sleeve are sequentially performed. (Function) In the strand insulated conductor connection method of the present invention having the above configuration, the inner sleeve and therefore both strand insulated conductors to be connected are drawn toward each other by tightening the outer sleeve, and their terminal portions are pressed into contact with each other. reach. Since the terminal portion is made of silver solder padding, the two insulated conductors of the strands are brought into close contact with each other by the pressure welding, and electrical continuity is formed between the two insulated conductors. It will be connected to.

(Example) FIG. 1, in which the same parts as in FIGS. 3 and 4 are given the same reference numerals, is a sectional view of the first and second steps of an embodiment of the present invention, and FIG. This is a cross-sectional view of the process. First, as shown for one segment l' in Figure 1, silver solder is welded to the cut surface of the connecting end of segment 1'' so that it almost forms a part of the spherical surface, and the whole of segment 1' is A terminal portion 4' is configured to provide conduction between the cut ends of the insulated wire 2'' (a similar terminal portion 4 is also provided in the other segment 1, as shown in FIG. 2). Next, an inner sleeve 5' having a right cylindrical part 5'a at both ends and a unidirectional thread part, for example, a right thread part 5'b in the axially intermediate part, is engaged with the connecting end of the segment 1'. Let. Next, the inner sleeve 5' is fixed to the connecting end by compression in the right cylindrical portion 5''a (a similar inner sleeve 5 is also fixed to the other segment 1 as shown in FIG. 2). However, the thread part is directed in the other direction (for example, the left thread part 5b).Finally, one half of the outer sleeve 6 is provided with the right inner thread part 6b' and the other half is provided with the left inner thread part 6b. The corresponding threads 5'b, 5b of the inner sleeves 5', 5 are screwed into the inner threads and tightened.As this tightening is done, the segments 1, 1' to be connected are drawn toward each other. The terminal parts 4 and 4' are brought into pressure contact with each other. Due to this pressure contact, the terminal parts 4 and 4' made of silver solder are pressed together.
4' are in close contact with each other, and conduction is formed between both segments 1 and 1'. In the connection method of the present invention having the above-mentioned configuration, the work of separating the insulated wires at the connection ends of the segments, the work of peeling off the insulation coating, the equipment used for this, and the gathering of the separated insulated wires when engaging the sleeves are performed. There is no need to do any additional work. That is, in the connection method of the present invention, the connecting ends of the segments are overlaid with silver solder, the inner sleeves are compressed and fixed to the connection ends of each segment, and the outer sleeves are screwed onto the inner sleeves. The connection between segments can be completed simply by tightening the . Although the above-described embodiment applies the present invention to segments in a high-power cable, the present invention is not limited thereto, and can also be applied to connection of appropriate conductors made of a collection of insulated wires. can do. [Effects of the Invention] As is clear from the above, in the wire insulated conductor connection method of the present invention, the insulated wires of the wire insulated conductor are separated one by one, and their insulation coatings are removed by sandblasting, etc. Since there is no need to do this, it is possible to save labor and time when connecting bare wire insulated conductors. Furthermore, since there is no need to carry out the sandplast method, there is no need to prepare equipment for that purpose, and the trouble of bringing equipment into and out of the tunnel can be avoided in this type of connection work, which is mostly done within the tunnel.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention at the first and second steps, Fig. 2 is a sectional view at the final step, and Fig. 3 is a front view at the first step of the conventional connection method. FIG. 4 is a sectional view at the final step of the conventional connection method.

Claims (1)

[Claims] a step of depositing silver solder on the connection ends of both strand insulated conductors to be connected to form a terminal portion for electrically connecting the end faces of the insulated strands forming the respective strand insulated conductors; and the above-mentioned connection. An inner sleeve with a right-handed thread on the outer periphery is attached to one of the connecting ends of the two strand insulated conductors, and an inner sleeve with a left-handed thread on the outer periphery is compressed and fixed to the other end. and a step of screwing an outer sleeve having an inner thread part that is threaded into the right thread part and the left thread part to the thread part of each of the inner sleeves, and tightening the outer sleeve. A method for connecting strands of insulated conductors characterized by sequentially applying the following steps.