JPH0515633U - Cable connection unit - Google Patents

Abstract

(57) [Summary] [Construction] The cable connecting unit comprises a cylindrical molded body 14a made of an epoxy resin, which has an internal electrode 14d at the center and cable end receiving ports 14b at both ends.
It is composed of a wound layer 14c of oil-impregnated paper provided on the outer periphery of the mold body 14a. The outer periphery of the wound layer 14c of oil-impregnated paper is liquid-tightly covered with a copper pipe 16 so as to straddle both ends of the cured resin mold body 14a. The pair of stress cones 15 are respectively inserted into the cable end receiving ports 14b and are pressed with a strong force toward the center side of the cured resin mold body 14a. [Effect] Since the main insulation is composed of a wound layer of oil-impregnated paper, the insulation characteristics of the cable connection unit are improved, and
The overall weight of the cable connecting unit is reduced, and the prefabricated connecting portion can be easily assembled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cable connection unit used for direct connection of high voltage cables such as CV cables of 154 kV to 275 kV class.

[0002]

[Prior Art]

 In general, a so-called prefabricated connecting portion, which will be described later, is known as a linear connecting portion of a 154 kV to 275 kV class CV cable. FIG. 2 shows a vertical sectional view of a conventional prefabricated connection portion. In the figure, at the ends of the pair of cables to be connected, the insulator 1 and the conductor 2 are exposed by the step stripping process, and the exposed left and right conductors 2 are compression-connected by the connection sleeve 3. Then, the conductor connecting portion of the cable is covered with the epoxy unit 4 having the internal electrode 4a at the center and the cable end receiving ports 4b at both ends. The stress cones 5 fitted into the outer circumference of the insulator 1 of each cable have a taper surface 5a whose outer diameter is reduced next toward the end of the cable. Each stress cone 5 is usually made of rubber or the like, and its tapered surface 5a is strongly pressed against the cable terminal receiving port 4b side of the epoxy unit 4 via the pressing means 6 of the stress cone 5, respectively. The electrical performance of the interface between the taper surface 5a and the cable terminal receiving port 4b of the epoxy unit 4 is secured. The epoxy unit 4 is cast in advance using a mold in a factory.

[0003]

[Problems to be solved by the device]

 By the way, in the prefabricated connection as shown in FIG. 2, the insulation thickness of the epoxy unit 4 becomes thicker as the voltage class of the cable becomes higher, and the taper surface 5a of the stress cone 5 and the cable terminal of the epoxy unit 4 become thicker. Since the insulation length of the interface between the receiving ports 4b increases, the epoxy unit 4 becomes large as a whole, which makes it difficult to assemble the prefabricated connection. Further, if the insulation thickness of the epoxy unit 4 is increased due to the increase in size of the epoxy unit 4, it is difficult to manufacture a uniform and high quality epoxy unit 4. Further, when the epoxy unit 4 itself is used as a high-voltage insulator, there is a disadvantage that the reliability is insufficient due to the insulation characteristics.

The present invention has been made in view of the above points, and solves the manufacturing problem of this type of epoxy unit, and is a cable connection unit capable of obtaining stable insulation performance even in an ultra-high voltage cable. Is intended to provide.

[0005]

[Means for Solving the Problems]

 The present invention has a cylindrical hard resin mold body having an internal electrode at the center and cable end receiving ports at both ends, and a winding layer of an insulating tape provided on the outer periphery of the cured resin mold body. The present invention relates to a cable connection unit equipped with.

[0006]

[Function] Since the winding layer of the insulating tape having better insulation properties than the cured resin mold body is provided on the outer periphery of the cured resin mold body, the insulation property of the cable connection unit is improved, and the cured resin mold body is also improved. Since the winding layer of insulating tape, which is lighter than the cured resin molded body, is provided on the outer periphery of the molded body, the overall weight of the cable connection unit can be reduced and prefabricated connection parts can be easily assembled. Becomes Further, since only the inner portion of the cable connecting unit needs to be molded with the hard resin mold, it is possible to manufacture a uniform and high quality cable connecting unit.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings of an embodiment. FIG. 1 is a vertical sectional view showing an embodiment of the cable connecting unit of the present invention. In FIG. 1, the left and right conductors 12 exposed by stripping a pair of cable ends for connection are compression connected by a connection sleeve 13, and the outer periphery of the conductor connection portion of this cable is connected by a cable connection unit 14. It is covered.

The cable connection unit 14 is composed of a cylindrical cured resin mold body 14a having cable end receiving ports 14b at both ends, and an oil-impregnated paper winding layer 14c provided on the outer periphery thereof. The cured resin mold body 14 is formed by molding an epoxy resin, and an internal electrode 14d is embedded in the central portion thereof as in the epoxy unit shown in FIG. An electrode layer for adjusting the electric field may be provided in the wound layer 14c of the oil-impregnated paper.

The outer periphery of the wound layer 14c of oil-impregnated paper is liquid-tightly covered with a copper pipe 16 across both ends of the cured resin mold body 14a. 17 are filled. A lead tube may be used instead of the copper tube. Reference numeral 18 in the drawing denotes a portion which has little electrical influence, for example, a reservoir provided on the outer periphery of the end of the copper tube 16 as necessary, and the thermal expansion of the insulating oil 17 is absorbed by this reservoir 18.

On the other hand, the pair of stress cones 15 fitted around the outer circumference of the insulator 11 of the cable are respectively inserted into the cable terminal receiving ports 14b of the cured resin mold body 14a, and the pressing means 19 for the stress cones 15 are respectively inserted. Is pressed by the strong force toward the center side of the cured resin mold body 14a, thereby ensuring the electrical performance of the interface between the taper surface 15a of the stress cone 15 and the cable end receiving port 14b of the cured resin mold body 14a. To be done.

The present invention is not limited to the above embodiments. Although an example in which an epoxy resin is used as the insulating material forming the cured resin mold body 14a is shown, any material may be used as long as it has similar characteristics and has sufficient mechanical strength to receive the cable end. There is no problem even if a hard resin is used. Instead of oil-impregnated paper, it is also possible to use laminated paper in which cellulose paper is pasted on both sides of a plastic film or plastic film with good insulation properties.

[0012]

[Effect of the device]

 As described above, in the cable connection unit of the present invention, the so-called main insulation of the cable connection unit is composed of the winding layer of the insulating tape, so that the insulation characteristics of the cable connection unit are improved and the cable connection unit is also improved. Since the outer peripheral portion of the unit is composed of a winding layer of lightweight insulating tape and the cable connecting unit is lightened as a whole, the prefabricated connecting unit can be easily assembled. Further, since only the so-called inner peripheral portion of the cable connection unit needs to be molded by the hard resin mold, the cured resin mold body can be manufactured uniformly and with high quality over the entire body.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a cable connecting unit of the present invention.

FIG. 2 is a vertical sectional view of a conventional cable connection unit.

[Explanation of symbols]

 11 …………………… Insulator 12 …………………… Conductor 13 …………………… Connection sleeve 14a ………………… Cured resin mold 14b …………… ...... Cable end receiving port 14c …………………… Insulating tape winding layer 15 …………………… Stress cone 19 …………………… Pressing means

Claims (1)

[Scope of utility model registration request] 1. A cylindrical hard resin mold having an internal electrode in the center and cable end receiving ports at both ends, and a winding layer of an insulating tape provided on the outer periphery of the cured resin mold. A cable connection unit characterized by being provided.