JPH09200939A - Power cable connection parts - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a power cable with improved withstand voltage by alleviating irregularity of an interface existing between a metal electrode and an epoxy resin insulator or on an outer cylinder surface of the epoxy resin insulator. To do. SOLUTION: The metal electrode 5 and the epoxy resin are included in the epoxy unit 1 including the epoxy resin insulator 3 containing the filler in which the metal electrode 5 is embedded in the outer periphery of the connecting portion for connecting the cable conductors of the prefabricated joint. It is characterized in that the epoxy resin 7 containing no filler is formed between the insulator 3 or between the outer cylinder of the epoxy resin insulator 3 and the conductive paint 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power cable connecting part.

[0002]

2. Description of the Related Art Conventionally, tape type joints (TJ), tape type mold joints (TMJ), extrusion mold joints (EMJ) and prefabricated joints (PJ) have been known as methods for connecting battery cables. Of these, the prefabricated joint (PJ) is, for example, as shown in FIG. 4, the ends of the left and right cables 21L and 21R are stripped off, and the cable conductors are exposed and abutted to connect the cable conductors to each other. ing.

An epoxy unit 27 composed of an epoxy resin insulator 25 having an electrode 23 embedded inside is covered on the outer periphery of this connecting portion, and a conical rubber is engaged with the left and right conical tapered surfaces of the epoxy unit 27. The mold stress cones 29L and 29R are fitted from the left and right, and the interfaces of the cables 21L and 21R and the epoxy unit 27 are brought into close contact with each other for insulation.

As described above, the prefabricated joint (PJ) is roughly divided into the cables 21L and 21R, the epoxy unit 27, and the rubber mold stress cones 29L and 29.
It consists of three parts, R. Among them, the epoxy unit 27 is the epoxy resin insulator 2 having the electrode 23.
5, the electrode 23 is made of a metal such as aluminum (Al) or copper (Cu), and the epoxy resin insulator 25 is made of an epoxy cured material containing an inorganic filler.

[0005]

By the way, since the above-mentioned conventional epoxy unit 27 is composed of the metallic electrode 23 and the epoxy resin insulator 25 obtained by curing the epoxy resin 15, there is a heterogeneous interface, If the interface is irregular, it becomes an electrical weak point. For example, if the inorganic filler of the epoxy resin insulator 25 is directly in contact with the surface of the metal electrode 23 as a protrusion, bubbles will be present. The presence of this bubble causes irregularity at the interface.

Further, the outer cylinder of the epoxy resin insulator 25,
Even when a conductive paint is applied as a ground electrode, if the inorganic filler directly sticks out or if the sticking out sticks out, it becomes a projection, and there is the problem that the same drawbacks as above occur. It was

An object of the present invention is to alleviate an irregularity in the interface between the metal electrode and the epoxy resin insulator or on the surface of the outer cylinder of the epoxy resin insulator to improve the withstand voltage. To provide.

[0008]

In order to achieve the above object, the power cable connecting component of the present invention comprises a filler having a metal electrode embedded inside the outer periphery of a connecting portion for connecting cable conductors of a prefabricated joint. In the epoxy unit composed of the epoxy resin insulator containing, only the epoxy resin layer containing no filler is formed between the metal electrode and the epoxy resin insulator, or the filler is attached to the outer cylinder of the epoxy resin insulator. It is characterized in that an epoxy resin layer not containing is formed, and a conductive paint is applied on the epoxy resin layer.

The thickness of the epoxy resin is 10 to 1000.
It is preferably 0 μm. Further, it is desirable to form only the epoxy resin containing no filler between the metal electrode and the epoxy insulator and between the outer cylinder of the epoxy resin insulator and the conductive paint.

By using the power cable connecting component as described above, a filler is contained between the metal electrode and the epoxy resin insulator or between the outer cylinder of the epoxy resin insulator and the conductive paint. Not epoxy resin 10-10
When the layer is formed with a layer thickness of 000 μm, the irregularity of the interface is relaxed. As a result, the withstand voltage can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory view showing an example of an embodiment of the epoxy unit 1 according to the present invention. The epoxy unit 1 has the same shape as a conventional epoxy unit, and includes an epoxy resin insulator (including an inorganic filler) 3 obtained by curing an epoxy resin, and the epoxy resin insulator 3
Aluminum (Al), copper (C
u) and other metal electrodes 5 made of a metal. Between the metal electrode 5 and the epoxy resin insulator 3, a layer thickness containing no inorganic filler is 10 to 100.
The epoxy resin 7 made of 00 μm is formed. As a result, there is no electrically harmful irregularity at the interface between the metal electrode 5 and the epoxy resin insulator 3, and the withstand voltage can be improved.

FIG. 2 shows an example of another embodiment instead of FIG. The epoxy unit 1 is composed of an epoxy resin insulator (including an inorganic filler) 3 and a metal electrode 5 embedded in the epoxy resin insulator 3 as in FIG. In addition, the outer cylinder of the epoxy insulator 3 is formed with the epoxy resin 7 containing no filler and having a layer thickness of 10 to 10000 μm.
The conductive paint 9 is applied on the above. The conductive paint 9 contains metal particles such as silver (Ag) and copper (Cu) or carbon particles and has an electric conductivity of 10 ⁵ Ω.
-It is preferable that the coating material is cm or less.

Thus, the irregularities on the surface of the outer cylinder of the epoxy resin insulator 3 can be covered and the withstand voltage can be improved.

AC withstand voltage was measured using model electrodes as shown in FIGS. 3A and 3B, for example. FIG. 3 (A)
Is a front view of the model electrode, and FIG. 3B is a plan view of the model electrode. In FIGS. 3A and 3B, the same parts as those of the epoxy resin insulator 3, the metal electrode 5, the epoxy resin layer 7 and the conductive paint 9 in FIGS. .

In FIG. 3, a portion of the epoxy resin 7 formed between the metal electrode 5 and the epoxy resin insulator 3 is A, and an epoxy resin formed between the epoxy resin insulator 3 and the conductive paint 9. As shown in Table 1, the measurement result of the AC withstand voltage was obtained with the portion 7 as B.

[0017]

[Table 1] As can be seen from Table 1, when the epoxy resin 7 is formed between the metal electrode 5 and the epoxy resin 3 (No. 2)
When an epoxy resin is formed between the epoxy resin insulator 3 and the conductive paint 9 (No. 3), the conventional method (between the metal electrode 5 and the epoxy resin insulator 3 and the epoxy resin insulator 3) is used. The AC withstand voltage value is improved as compared with the case where the epoxy resin 7 is not formed between the conductive paint 9 and the conductive paint 9. Further, when the epoxy resin 7 is formed between the metal electrode 5 and the epoxy resin insulator 3 and between the epoxy resin insulator 3 and the conductive paint 9 (No. 4), the AC withstand voltage value is further improved. ing.

Further, the AC withstand voltage value was measured while variously changing the layer thickness of the epoxy resin 7 as shown in Table 2.

[0019]

[Table 2] As shown in Table 2, the layer thickness of the epoxy resin 7 is 10 to 1
It was found that an effect was obtained when the thickness was 0000 μm.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.

[0021]

According to the present invention, as will be understood from the above description of the embodiments, the space between the metal electrode and the epoxy resin insulator, or the outer cylinder of the epoxy insulator and the conductive paint is By forming an epoxy resin that does not contain a filler during the period, the irregularity of the interface can be alleviated and the withstand voltage can be improved. Moreover, when the layer thickness of the epoxy resin is 10 to 10000 μm, the withstand voltage can be further improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of an embodiment of an epoxy unit of the present invention.

FIG. 2 is an explanatory diagram illustrating an example of another embodiment that replaces FIG.

FIG. 3 is an explanatory diagram of measuring AC withstand voltage using a model electrode.

FIG. 4 is an explanatory view showing a conventional prefabricated joint.

[Explanation of reference numerals] 1 epoxy unit 3 epoxy resin insulator (including filler) 5 metal electrode 7 epoxy resin containing no filler 9 conductive paint

Claims (3)

[Claims] 1. An epoxy unit comprising an epoxy resin insulator containing a filler in which a metal electrode is embedded inside an outer periphery of a connecting portion for connecting cable conductors of a prefabricated joint. A power cable connecting part characterized in that only an epoxy resin layer containing no filler is formed between them. 2. An epoxy unit comprising an epoxy resin insulator containing a filler having a metal electrode embedded in the outer periphery of a connecting portion for connecting cable conductors of a prefabricated joint, the outer cylinder of the epoxy resin insulator. A power cable connecting component, characterized in that an epoxy resin layer containing no filler is formed on the epoxy resin layer, and a conductive paint is applied onto the epoxy resin layer. 3. The thickness of the epoxy resin layer is 10 to 10
The power cable connecting component according to claim 1, wherein the power cable connecting component is 000 μm.