JPS6034790B2 - Steel position detection method in compression joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention improves the position of the steel material in the straight connection part of steel-core aluminum stranded wires and the compression connection part of electric wires that have steel inside, such as jumper sockets using steel-core aluminum stranded wires as jumper wires. It relates to a method for easy and reliable detection.

Conventionally, in the straight connection of steel core aluminum stranded wires, the steel core is compressed and connected with a steel sleeve, and then the steel sleeve and the aluminum stranded wire layers on both sides are covered with a real sleeve, and the aluminum sleeves are compressed and connected.

At this time, if the center positions of the aluminum sleeve and the steel sleeve are misaligned, the contact areas on the left and right sides of the aluminum sleeve will be different, and the one with the smaller connection area will be abnormally heated, so it is necessary to align the centers of the aluminum sleeve and the steel sleeve. After the aluminum sleeve is wrapped around the outside of the steel sleeve and compressed and connected, the steel core aluminum stranded wire A' is compressed as shown in Fig. 5 to detect whether the steel sleeve is correctly positioned in the center of the aluminum sleeve. A steel sleeve 3 is connected to a steel core 2' by moving a strong permanent magnet 5' and a magnetic needle 6' along the outer longitudinal direction of the connecting part 1'.
Since the strength of the magnetic field changes at a certain position, this is detected by the magnetic needle 6' to detect the position of the steel sleeve 3' relative to the aluminum sleeve 4'. According to this method, a strong permanent magnet 5' is used, so after several inspections, the steel core 2'
Another disadvantage is that the steel sleeve 3' becomes magnetic and the deflection of the magnetic needle 6' becomes unclear. In view of this, the present invention magnetizes steel materials such as steel cores and steel sleeves in compression joints over the entire compressed portion with a permanent magnet, and then detects the magnetism of the magnetized steel materials with a magnetic detector to detect magnetism in non-magnetic materials such as aluminum sleeves. The position of the steel core or key sleeve, etc. is detected.

Next, this will be explained in more detail based on the embodiment shown in the drawings.

Figure 1 shows the case where the method of the present invention is applied to the compression connection part of the jumper socket C of the retaining clamp B which holds the steel-core aluminum stranded wire A, and the steel-core aluminum stranded wire A is used as the jumper wire D. When this is inserted into the jumper socket C of the retaining clamp B and connected by compression, the position of the steel core 2 of the jumper wire D is detected and the insertion position of the jumper wire D is correct. It detects whether it is appropriate or not. Since the jumper socket C is usually cast aluminum, the jumper wire D is inserted into the socket C, and a horse clamp type permanent magnet 5 is inserted along the entire outer length of the compressed connection part 1 as shown in FIG. If it is moved in the direction of the arrow, only the steel core 2 of the entire compressed portion of the jumper wire D is magnetized. Next, if the ball element 7 of the magnetic detector 6 is applied to the magnetized portion of the steel core 2 as shown in FIG. 3, the meter of the magnetic detector 6 will swing, and the presence of the steel core 2 can be detected. Next, place the Hall element at a position away from where steel core 2 is located (1 in the figure).
(the dotted chain line indicates this), the meter of the magnetic detector 4 has a weak swing, so the end position of the steel core 2 can be detected, and therefore the end insertion position of the jumper wire D can be detected. In addition, in FIG. 2, the steel core 2 is
Although the case where magnetized is shown is not limited to this, for example, as shown in FIG. 4, a rod-shaped permanent magnet 8 may be moved in the direction of the arrow to be magnetized. As a means of magnetizing steel materials,
Although it is possible to use electromagnets, there is generally no commercial power supply at the steel tower locations where such inspections are performed, so only permanent magnets can be used, as shown in FIGS. 2 and 4.

Furthermore, although the above-mentioned embodiment shows the detection of the steel core at the jumper socket part of the detention clamp using the steel-core aluminum stranded wire A as a jumper wire, It can be applied in exactly the same way to detect the position of a steel core or a steel sleeve in a joint. However, since it is necessary to know the position of the steel material inside the compressed part, the range of magnetization must be performed over the entire compressed part. As explained above, according to the present invention, in a compression connection such as a straight connection of steel-core aluminum stranded wire, a compression connection of a retaining clamp, or a jumper terminal using a steel-core aluminum strand as a jumper wire, the After a steel material such as a core or a steel sleeve is magnetized over the entire compressed part by a permanent magnet, a magnetic detector is moved along the compression connection part to detect the magnetism of the steel material and detect a position where the magnetism is weak. Since the edge of the steel material located inside the compression joint is detected, the accuracy of detecting the edge of the steel material does not decrease even if such position detection work is repeated many times, and the end of the steel material is detected using the strength or weakness of the magnetic field compared to the conventional method. In comparison, the detection accuracy is significantly improved.

Furthermore, since the present invention simply magnetizes the steel core in the compression joint with a permanent magnet and measures the strength of the magnetism, the detection work is simple.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of the method of the present invention, FIGS. 2 and 4 are explanatory diagrams showing different examples of the magnetization step in the method of the present invention, and FIG. 3 is an explanatory diagram showing an example of the magnetic detection step of the method of the present invention. FIG. 5 is an explanatory diagram showing a method for detecting the position of a steel sleeve at a straight connection portion of a subordinate steel-core aluminum stranded wire. 1... Compression connection part, 2... Steel core, 5...
...Horse-shaped permanent magnet, 6...Magnetic detector, A
...Steel core aluminum wire. Figure 1 Figure 3 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a compression joint of an electric wire that has a steel material inside, the steel material is magnetized over the entire compressed part by a permanent magnet, and then a magnetic detector is moved along the compression joint to detect the magnetism of the steel material, and detects weak magnetism. A method for detecting the position of a steel member in a compression joint, the method comprising detecting the position.