JPH02250622A - Stress cone for cable - Google Patents

Abstract

PURPOSE:To eliminate a slip in working and to facilitate winding of an insulation tape by forming protruding rings on the outer surface of a large-diameter part of a spinning stress cone, and forming a recess for winding a protective tape on the outer surfaces of both ends. CONSTITUTION:A stress cone has a hollow part 6 in which a power cable is inserted, is formed of a rubber insulator 7 and a semiconductive layer 8, and protruding rings 9 are integrally provided at an equal interval on the outer surface of a large-diameter part of a rubber insulator 7. Recesses 10, 11 for winding protective insulation tapes are formed on the outer surfaces near both ends of the cone. Even if grease is adhered when the cone is inserted into a cable, slip is reduced by the rings 9 to improve operability. When the tape is wound, even if the number of turns is not counted, as it is so wound as to fill in the recesses 10, 11, and insulation is satisfied, thereby providing high operability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a stress cone for a cable that is attached to a connection portion, terminal portion, etc. of a power cable.

[Prior Art] For example, at a connection portion or a terminal portion of a power cable, the electric field, that is, the potential gradient, of the power cable is easily relaxed.

[Problems to be Solved by the Invention] When inserting this stress cone into a power cable, grease is generally applied to the surface of the power cable to improve the slippage before insertion. Since the stress cone is covered with grease, it becomes slippery even when gripped, which impedes workability. Further, the stress cone is fixed to the power cable by wrapping a protective insulating tape from the outside of both ends to the outer layer of the cable. When winding this insulating tape, it is necessary to wind it a predetermined number of turns in order to keep the insulation properties constant, but it is extremely troublesome to work while counting the number of turns. Since the rolled insulating tape bulges up as a step, it also has the disadvantage that it is easily peeled off later.

An object of the present invention is to solve the above-mentioned problems, to reduce slippage on the stress cone when inserting the stress cone, to easily wind the protective tape for fixing the stress cone, and to achieve a smooth finish. The purpose of the present invention is to provide a stress cone for cables.

[Means for Solving the Problems] In order to achieve the above object, the stress cone for cables according to the present invention is a stress cone for use in power cables, and has a large diameter portion of the stress cone that is approximately spindle-shaped. A plurality of convex rings are formed on the outer periphery of the surface of the power cable, and recesses for winding the protective tape integrally wound with the power cable are formed on the outer periphery of the surface of both ends. be.

[Function] By devising the surface shape of the stress cone, the present invention having the above-mentioned configuration reduces slippage during work, and also allows easy winding of the insulating tape without creating any steps.

[Example] The present invention will be explained in detail based on illustrated embodiments.

The embodiment shows, for example, a connecting portion of a power cable for driving a high-voltage motor, and FIG. 1 shows a front view, and FIG. 2 shows a sectional view from either side. The exterior part l of the power cable is removed, and the cable is branched into three cables 2a, 2b, and 2c. A three-pronged branch pipe 3 is inserted and fixed at the base of one branch, and a protective insulating tape 4 is placed around it. is wound. In addition, the periphery of the tip of each cable 2a, 2b, 2c is made of EP rubber or the like, and has a length of, for example, 70 mm.
hollow spindle-shaped rubber stress cones 5a, 5b,
5c is inserted. These stress cones 5a%
5b%5c has a hollow part 6 through which the power cable 2 is inserted, as shown in Fig. 1s3, and is composed of a rubber insulating part 7 and a semiconductive layer part 8, and the outer peripheral surface of the large diameter part of the rubber insulating part 7 is For example, three protruding rings 9 are integrally provided around the circumference at equal intervals. After construction, colored tapes made of synthetic resin materials of different colors, such as red, blue, and white, can be wrapped around the flat parts between the convex rings 9, respectively, for each of the stress cones 5a, 5b, and 5c, respectively.

It is preferable that the height of the convex ring 9 be approximately the same as the thickness of the colored tape wound around it to avoid a difference in level.A protective insulating tape is wound around the outer periphery near both ends of these stress cones 5a, 5b, and 5c. A recess 10.11 is formed for the purpose.

In FIG. 3, the dotted lines indicate the outer shape of both ends of a conventional stress cone, and the fourth part 1O111 has a smaller diameter than this. The semiconductive layer portion 8 is connected to the cables 2a, 2b, 2
The stress cone 5a is connected to each external semiconductive layer 12 of c by winding the semiconductive tape 13.
, 5b.

A protective insulating tape 14 is wound around the recesses 10 and 11 at both ends of the stress cones 5a, 5b, and 5C, respectively, and the stress cones 5a, 5b, and 5C are fixed to the cables 2a, 2b, and 2c, respectively. On the other hand, a conductor 15 is exposed from the end of each cable 2a, 2b, 2c, and is connected to a motor side lead wire 17a, 17b, 17c of a high voltage motor (not shown) via a connection terminal 16, and An insulating tape 18 is wound around.

With such a structure, the cables 2a, 2b
, 2c are inserted into the stress cones 5a, 5b, 5c, so that the stress cones 5a, 5b, 5c can relieve the electrical stress which is the original purpose, and also the stress cones 5a, 5b, 5c can reduce the stress. , 5C to cable 2a,
2b, 2c, stress cone 5a,
Even if grease adheres to the stress cones 5b, 5c or the gloves, the protruding ring 9 reduces slippage, improving workability during insertion, and furthermore, the protective insulation wound on the stress cones 5a, 5b, 5c The tape 14 can satisfy the insulation properties without counting the number of turns by simply filling the recesses 10 and 11, and can obtain a smooth shape without being raised as a step.

In addition, by winding a colored tape around the convex ring 9M, the cables 2a, 2b, and 2C can be easily distinguished, and
The difference in level between the protruding rings 9 can be filled, and the surface of the large diameter portion can be made flat.

7b, 7C is a lead wire.

[Effects of the Invention] As explained above, the stress cone for cables according to the present invention can not only alleviate electrical stress, which is the original purpose, but also prevent the stress cone from slipping during work by providing a convex ring. Further, by providing recesses at both ends, there is no step part when winding the protective insulating tape, and furthermore, there is an advantage that there is no need to count the number of windings during work.

[Brief explanation of drawings]

The drawings show an embodiment of the stress cone for cables according to the present invention, in which Figure 1 is a front view, Figure 2 is a sectional view seen from the side, and Figure 3 is a sectional view of the stress cone. Codes 2a, 2b, 2c are cables, 3 is a conductor, 4.14
5a, 5b, 5c are rubber stress cones, 6 is a hollow part, 7 is a rubber insulation part, 8 is a semiconductive layer part,
9 is a convex ring. 10.11 is a recess, 18 is a connection terminal, and 17a.

Claims (1)

[Claims] 1. A stress cone for use with a power cable, in which a plurality of convex rings are formed on the outer periphery of the large diameter portion of the approximately spindle-shaped stress cone, and the outer periphery of the surface of both ends is integrated with the power cable. A stress cone for cables characterized by forming a concave portion for winding a protective tape.