JPS63198269A - Connection insulating apparatus for insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an insulating device for connecting portions of insulated electric wires, and more particularly to a device for insulating connecting portions of insulated electric wires in underwater motors.

(Prior Art) In underwater electrical conductors, insulated wires made of extruded plastics such as crosslinked polyethylene, polypropylene, and ethylene propylene rubber as insulators are used as motor windings. Conventionally, in this type of winding, the windings of each phase were often connected and insulated underwater at the three-phase power neutral point, and on the input side, the insulated wire used for the winding was different from the one used for the winding. A second 1@green electric wire is often used, connected to the winding, then terminated, and then drawn out of the motor frame using the second insulated wire as a lead wire.

Furthermore, during manufacturing, the windings are usually divided into several parts and wound, which often requires connections between each winding.

Therefore, a connection insulating device as shown in FIG. 4 has conventionally been used. Figure 4 shows the conventionally known water seal type underwater group. This shows the insulating device for the winding connection part of the machine, especially the connection part insulating device for the first plastic insulated wire 1 used as the winding wire and the second plastic insulated wire 2 used as the Hiji wire. This is what is shown.

The first plastic insulated wire 1 is made of a conductor [a] and a plastic insulator that covers the conductor 1a, and the second plastic insulated wire 2 is similarly made of a conductor 2a and a plastic insulator. There is.

The connecting portions of these first and second plastic insulated wires 1 and 2 are formed by connecting the respective conductors 1a and lb by soldering or silver brazing to form a conductor connecting portion 3. Each insulator 1b.

2b and plastic insulating tape that fuses at high temperature.
The insulators 1a, 2a and high-temperature IB can be wound, heated and melted to an insulation thickness according to the voltage class, or alternatively, insulators 1a, 2a and high temperature IB
The ground insulating layer 4 is formed by molding with plastic that can be fused.

(Problems to be Solved by the Invention) However, in these connection part insulating devices ff, when forming the ground insulating layer 4 of the connection part, the first or second plastic insulated wire 1.2 located nearby is The problem is that the plastic insulators 1c and 2c are exposed to high temperatures, causing uneven thickness, or thermal deterioration, resulting in weak points where insulation performance deteriorates during long-term operation compared to other insulating parts. There was a point. SUMMARY OF THE INVENTION Therefore, in order to solve the above-mentioned problems, it is an object of the present invention to provide an insulating device for connecting parts of insulated wires, which insulates and reinforces these weak points and has insulation performance comparable to other insulated parts in these parts. shall be.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention joins each conductor of an insulated IV wire whose periphery is covered with an insulator, and applies an insulator to the joint portion by heat treatment. At the insulated connection part of the insulated wire that is fixed and formed with a ground insulating layer, the ground insulating layer extends from the ground insulating layer to the insulator of the insulated wire so as to cover the insulator surface of the B-type electric wire that is in contact with the end of the ground insulating layer. Provided is an insulating device for connecting portions of insulated wires, characterized in that a reinforcing insulating layer is formed of an insulating material.

(Function) In the device configured as described above, when forming a ground insulating layer at the joint of the conductor, even if the insulator of the insulated wire located near the ground insulating layer is damaged, the reinforcement Since the insulation is reinforced by the insulation layer, it is possible to prevent the insulation properties from deteriorating due to long-term energization.

(Embodiment) An embodiment of the insulating device for connecting portions of insulated wires according to the present invention will be described with reference to FIGS. 1 and 2. Note that the same parts as in FIG. 4 are designated by the same reference numerals, and a description thereof will be omitted.

Reference numeral 5 denotes a reinforcing insulating layer made of adhesive tape, and this reinforcing insulating layer 5 extends from the ground insulating layer 4 to the surface of the plastic insulator 1b of the thermoplastic plastic insulated wire 1. The plastic insulator 2b of the second thermoplastic plastic insulated wire 2 extends from the plastic insulator 2b. When forming this reinforcing insulating layer 5, the surfaces of the insulated wire insulators 1b and 2b and the connecting portion ground insulating layer 4 at the portions around which the adhesive tape is wound are first cleaned with alcohol or the like. The range of the reinforcing insulating layer 5 made of adhesive tape is the rated voltage of the underwater motor or
After the connection part ground insulating layer 4 is formed, it may be changed as appropriate depending on the degree of deformation or color change of the insulated wire insulator 1c or 2c in FIG. 4, but at least the connection The surface of the insulated wire insulator that is in contact with the end of the ground-to-ground insulating layer 4 is formed so as to completely cover it.

Examples of this adhesive tape include CMC adhesive tape (Qebetechnik GMBH, Vest-G
erwany) is appropriate.

The effect will be explained below. If the reinforcing insulating layer 5 is formed in this way, especially when forming the connecting portion ground insulating layer 4, even if the insulated wire insulator portion (1, C in FIG. 4) located near this layer is damaged, Because it is reinforced with insulation, it exhibits excellent insulation properties even when exposed to long-term energized conditions.

In order to confirm this effect, the following test was conducted. First, sample B having a conventional configuration shown in FIG. 4 was prepared as a comparative example. The conductor of the first plastic insulated wire 1 in this sample B is a 10 mn 2 annealed copper single wire, the insulator 1b is made of electron beam crosslinked polyethylene, and the outer diameter of the wire including both is 6.1 mm. . The conductor of the second plastic insulated wire 2 is a 16 mm2 soft steel single wire, the insulator 1b is made of steam crosslinked polyethylene, and the outer diameter of the wire including both is 9.6 mm.

The connecting portion ground insulating layer is formed by winding a 0.1 mm thick electron beam crosslinked polyethylene tape a predetermined number of times so that the outer diameter after heat fusion is 10.2n++n. Next, as an example of the present invention, a sample A having the shape shown in FIG. 1 was prepared.

Except for the reinforcing insulating layer 5, everything else had the same composition and shape as the above sample B. This reinforcing insulating layer 5 is made of CMC2610 tape (K, 9ebetechnik GMBH), with a thickness of 15 mm on the insulated wire insulator and 8 mm on the ground insulating layer at the connection part.
mm, and the maximum outer diameter is 10.4 m+n.

Next, this test will be explained. This test tested both samples at 3.3kV-300011z in tap water at 90°C.
is applied continuously, and the AC residual breakdown voltage is determined at predetermined intervals with a step-up dimension of 5 kV.

The test results are shown in Figure 2, where the frequency acceleration coefficient is set to 60 times 50Hz, converted to operating time at 50Hz, and the horizontal axis represents this, and the vertical axis represents the residual breakdown voltage divided by the insulation thickness at the breakdown point. That's right. As shown in FIG. 2, it can be seen that sample A (this example) has a lower rate of decrease and has better characteristics than sample B (conventional example).

In addition, as a result of checking the fracture location, in the case of the samples aged 1 year or more in Figure 2, in sample B all the fractures occurred at the part 1C of the first plastic insulated wire 1 in Figure 4, but in sample A
In this case, the particles were randomly distributed on the first plastic insulated wire insulator la outside the reinforcing insulating layer 5 in FIG. In other words, sample B breaks down at the part that was damaged when the connecting part ground insulating layer 4 was formed, and the rate of decline is large, but according to this example, the breakage at the position seen in sample B is prevented and the result is excellent. It can be seen that a connection section with excellent performance can be obtained.

Next, another embodiment according to the present invention will be described with reference to FIG. Note that the same parts as in FIGS. 1 and 4 are designated by the same reference numerals, and the description thereof will be omitted.

5a is a surface protective layer, and this surface protective layer 5a is formed around the adhesive tape insulating layer 5 and the connecting portion ground insulating layer 4. The method for forming the adhesive tape insulating layer 5 is the same as that in the first embodiment, but the surface protective layer 5a is made of a shrink tube MW T H (Rayche
The material is compressed and formed by heating.

Next, the operation of this embodiment will be explained.

In recent years, the operating conditions for water-seal submersible motors have become extremely strict, with the pressure of sealed water sometimes reaching tens of atmospheres, or the temperature approaching the boiling point of water. If the above embodiment is used in such a case, there is a possibility that high-temperature or high-pressure water will diffuse and permeate the reinforcing insulating layer (5 in FIG. 1) made of adhesive tape and penetrate into the interior. In such a case, if this embodiment is used, the surface protection layer 5a made of a shrink tube can prevent water from spreading and penetrating into the reinforcing insulating layer 5Δ, and the reinforcing insulating layer 5 can be It is possible to fully demonstrate the same effects as.

The above two embodiments have been explained by taking as an example the connection of the first insulated wire used for the winding and the second insulated wire used for the lead wire. , or the connection between each winding), if the second insulated wire is replaced with the first insulated wire in the above explanation and considered as a connection between the same wires, it can be carried out in the same way, and the same effect can be achieved. Can be done.

〔Effect of the invention〕

As described above, according to the present invention, a reinforcing insulating layer is formed from the ground insulating layer to the insulator of the insulated wire in the insulated connection part, so that uneven thickness or heat generated when forming the ground insulating hole-1 is prevented. This is the 1st insulating device for insulated wire connections that strengthens insulation weak points due to deterioration and does not cause performance deterioration even after long-term operation! ) can be done.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an insulating device for connecting parts of insulated wires according to an embodiment of the present invention, FIG. 2 is a characteristic curve diagram showing characteristics of residual breakdown voltage due to underwater charging, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a sectional view showing a conventional insulating device for connecting portions of insulated wires. 1... first thermoplastic plastic insulated wire, 2...
・Second thermoplastic plastic insulated wire, 1a・2a・
...Conductor, 1b/2b...Plastic insulator, 3...Conductor connection portion, 4...Ground insulation layer, 5...Reinforcement insulating layer, 5a...Surface protection layer. Agent Patent Attorney Noriyuki Chika Yudo Hirofumi Mitsumata-11=

Claims (1)

[Claims] 1) An insulated connection of insulated wires in which conductors of insulated wires whose periphery is covered with an insulator are bonded, and an insulator is fixed to the bonded portion by heat treatment to form a ground insulating layer. In the part, a reinforcing insulating layer is formed with an insulator from the ground insulating layer to the insulator of the insulated wire so as to cover the insulator surface of the insulated wire with which the end of the ground insulating layer contacts. Insulating device for connecting parts of insulated wires. 2) The insulating device for connecting portions of insulated wires according to claim 1, wherein the reinforcing insulating layer is formed by winding an adhesive insulating tape. 3) The reinforcing insulating layer is formed by a first layer around which adhesive insulating tape is wound, and a second layer covering this first layer and the ground insulating layer with a shrink tube. A connection insulating device for insulated wires according to scope 1.