JPH0312018Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is applicable to the aerial termination of power cables, GIS
It relates to cable connections such as terminations, submerged terminations, and oil stop connections.

When assembling the above connections, in recent years prefabricated electric field shielding cones (including Epokin units, etc.) and capacitor cones (hereinafter collectively referred to as prefabricated cones) have been used to improve workability. This method has become mainstream.

In that case, the prefabricated cone is inserted and fixed onto the cable core with a reinforcing oil-impregnated paper layer.

This invention relates to the structure of the cable connection portion, particularly the contact portion between the reinforcing oil-impregnated paper layer and the prefabricated cone.

[Conventional technology] An example is shown in FIG.

A reinforcing oil-impregnated paper layer 20 is formed by wrapping a wide oil-impregnated paper on the cable core 10 in a state of the same diameter in the longitudinal direction. And on top of that, prefab cone 30
is inserted and secured in place.

[Problems to be solved by the invention] In the above case, the difference between the outer diameter of the reinforcing oil-impregnated paper layer 20 and the inner diameter of the prefabricated cone 30 is made as small as possible. However, if the difference is zero,
Insertion of the prefab cone 30 becomes extremely difficult.

Therefore, an oil gap 40 is inevitably formed between the reinforcing oil-impregnated paper layer 20 and the prefabricated cone 30, and since this oil gap 40 is continuous in the longitudinal direction, it tends to become an electrical weak point.

[Means for solving the problem] This invention, as shown in FIGS.
Alternatively, a tapered portion 36 is provided so that the inner diameter becomes smaller toward the distal direction 34, and a plurality of stepped portions 22 or tapered portions 26 are also provided in the reinforcing paper insulating layer 20 correspondingly. The above problem has been solved by adopting a configuration in which the outer diameter is made smaller as it approaches .

[Example] (Fig. 1) A plurality of steps 3 are formed on the inner surface of the prefabricated cone 30.
2 is provided, and the inner diameter is made smaller in a stepwise manner toward the distal end direction 34.

That is, the inner diameter of the BC portion is smaller than that of the AB portion, and the inner diameters are made smaller in the order of CD, DE, and so on.

Correspondingly, a plurality of step portions 22 are also provided in the reinforcing paper insulating layer 20.

Then, set the outer diameter of the ab part to prefabricated cone 3.
It should be equal to or slightly smaller than the inner diameter of the AB part of 0.

Also, set the outer diameter of the bc part to prefabricated cone 30.
It should be equal to or slightly smaller than the inner diameter of the BC part.

Similarly, the outer diameters of the CD, DE, . . . portions are made equal to or slightly smaller than the inner diameters of the CD, DE, .

Then, when the prefabricated cone 30 is inserted in the direction of the arrow 50 and covered on the reinforcing paper insulation layer 20,
Above the ab part, the AB part is again bc, cd, de,...
On top of each part of ..., respectively BC, CD, DE, ...
Make sure each part of...is covered.

Therefore, the oil gap 40 is divided at each step and is not continuous in the longitudinal direction.

FIG. 2 shows an example in which the present invention is applied to an epoxy unit, and the electrical characteristics are improved in the same manner as above.

FIG. 3 shows an example in which electrical characteristics are improved by providing a taper instead of a stepped portion to improve adhesion.

That is, the inner surface BC part of the prefabricated cone 30 is made into a tapered part 36, the CD part on the other side is made into a cylindrical surface, and the DE part on the other side is made into a tapered part 36, and the number of tapered parts 36 is increased as necessary. That's how it is.

Correspondingly, a plurality of tapered portions 26 are also provided on the reinforcing paper insulating layer 20.

Other details are the same as in the above case.

By doing this, in the conventional construction method, the oil gap was continuous in the longitudinal direction, but the tapered portion improves the adhesion and divides the oil gap, so that the electrical characteristics can be improved.

[Effect of the invention] Since the oil gap 40 is divided at the stepped portion or the tapered portion and is not continuous in the longitudinal direction, it is possible to prevent the electrical characteristics from deteriorating due to the oil gap 40 being continuous in the longitudinal direction.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are explanatory views of different embodiments of the present invention, and FIG. 4 is an explanatory view of the prior art. 10: Cable core, 20: Reinforced oil-immersed paper layer, 2
2: Stepped portion, 26: Tapered portion, 30: Prefabricated cone, 32: Stepped portion, 34: Tip direction, 36: Tapered portion, 40: Oil gap, 50: Arrow.

Claims (1)

[Claim for Utility Model Registration] In a cable connection section where a reinforcing oil-impregnated paper layer 20 is provided on the cable core 10, and a prefabricated cone 30 is inserted and covered thereon and fixed, a plurality of layers are formed on the inner surface of the prefabricated cone 30. Stepped portion 32
Alternatively, a tapered portion 36 is provided so that the inner diameter becomes smaller toward the distal direction 34, and a plurality of stepped portions 22 or tapered portions 26 are also provided in the reinforcing paper insulating layer 20 correspondingly. A cable connection part characterized by an outer diameter that decreases as it approaches.