JP2533365Y2 - Condenser cone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a condenser cone used for electrically protecting a terminal of a high-voltage cable.

(Prior Art) For example, when performing an electrical test on a high-voltage cable, the test terminal has the following configuration.

FIG. 2 shows a vertical sectional view of a main part of a conventional high-voltage cable test terminal.

In the figure, a cable 1 is set up inside a bushing 2 and terminated. The bushing 2 is provided upright on the upper surface of the gantry 3. The cable 1 is protected by a protective bracket 4 at a portion of the base 3 below the bushing 2.

Further, a capacitor cone 6 is mounted on the outer periphery of the insulator 5 of the cable 1 for insulation reinforcement. Insulator 5
Is exposed at the upper end of the bushing 2 and is electrically connected to the conductor pull-out bar 8. The upper part of the bushing 2 is electrically protected by a shield ring 9.

Here, the condenser cone 6 is formed by winding oil-immersed paper, for example, and electrodes made of aluminum foil, tin foil, or the like are wound between the layers. In addition, bushing 2
Is filled with insulating oil.

When assembling the cable end portion having the structure shown in FIG. 2, the capacitor cone 6 is first crane-mounted while the terminal portion of the cable 1 is vertically supported above the gantry 3, as shown in FIG. Hanging by 10, cable 1
Is mounted so that the capacitor cone 6 is put on the insulator from the tip of the capacitor cone. Thereafter, the bushing 2 shown in FIG. 2 is similarly suspended by using the crane 10, mounted on the gantry 3, and connected with conductors.

Incidentally, the capacitor cone 6 is detached from the cable 1 again after the power application test of the cable 1 is completed, and is used for another test or the like. As described above, in order to repeatedly use the condenser cone 6, the condenser cone 6 must be
The oil immersion paper 6b is wound around a pipe 6a made of a vinyl chloride resin or the like.

(Problems to be Solved by the Invention) By the way, at the time of assembling or disassembling the cable terminal as described above, the capacitor cone 6 is connected to a wire as shown in FIG.
Work such as binding with 11 and lifting it with a crane 10 is performed.

Then, a pipe 6a having an inner diameter substantially equal to the outer diameter of the insulator of the cable 1 is inserted and removed. However,
At this time, forces in directions opposite to each other are applied between the pipe 6a and the oil-immersed paper 6b, which may cause a displacement between the two.

FIG. 4 shows a longitudinal sectional view of a main part of the condenser cone 6.
As shown in the figure, usually, an oil-impregnated paper 6b having a predetermined width is wound around the outer periphery of the pipe 6a, and the oil-impregnated papers adjacent to each other with the solid line drawn obliquely in the figure as a boundary are not separated from each other. Closely adhered.

However, as described above, when forces in opposite directions are applied to the pipe 6a and the oil-immersed paper 6b, a displacement occurs between the two,
As shown in FIG. 5, between the wound layers of the adjacent oil-impregnated paper 6b,
A gap 12 is created.

When such a gap 12 is formed, this portion becomes an electrical weak point and may cause dielectric breakdown. Usually, the pipe 6a used as a core has a length of 2 meters, or a length of nearly 4 meters.

On the other hand, the width of the oil-immersed paper 6b is usually about 600 to 800 mm. Therefore, the condenser cone cannot be formed at a stroke on the pipe 6a by using one oil-immersed paper 6b, and it is difficult to avoid the above-described problem.

The present invention has been made in view of the above points, and aims to provide a condenser cone with improved insulation characteristics by eliminating slippage between the pipe 6a serving as a core and the oil immersion paper 6b. It is.

(Means for Solving the Problems) In the capacitor cone of the present invention, an annular concave portion is formed on the outer peripheral surface of a cylindrical winding core, an insulating paper winding layer is formed so as to fill the concave portion, and an insulating paper is further coated on the outer periphery. It is characterized by being wound in a cone shape.

(Operation) In this condenser cone, an annular concave portion is formed on the outer peripheral surface of the cylindrical winding core, and an insulating layer is wound thereon, and then an insulating paper winding layer is formed in a cone shape on the outer periphery. Therefore, the insulating paper wound in a cone shape comes into contact with the insulating paper winding layer without directly contacting the cylindrical core at the annular concave portion. The insulating paper winding layer is prevented from sliding on the outer peripheral surface of the cylindrical winding core by the annular concave portion.

On the other hand, the outer peripheral surface of the wound layer of the insulating paper has higher friction due to sliding with the insulating paper than the outer peripheral surface of the cylindrical core. Therefore, even when the capacitor cone is inserted into or pulled out of the cable, slippage between the cylindrical core and the insulating paper wound in a cone shape hardly occurs.

(Embodiment) Hereinafter, the present invention will be described in detail with reference to the embodiment shown in the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the condenser cone of the present invention.

In the figure, this condenser cone 20 has a cylindrical core 21 arranged at the center. The cylindrical core 21 is made of, for example, a vinyl chloride resin pipe or a fiber reinforced plastic pipe. A cone-shaped insulating paper 22 is wound around the outer periphery of the cylindrical core 21. A metal foil 23 for keeping the electric field in the longitudinal direction of the capacitor cone constant is wound between the winding layers of the insulating paper 22 at appropriate intervals.

 The enlarged view within the circle A in the figure is shown below the figure.

Here, on the outer peripheral surface of the cylindrical core 21, as shown in the figure,
An annular recess 21a is formed.

The annular concave portion 21a is formed by, for example, cutting the outer peripheral surface of the cylindrical core 21. Alternatively, a plurality of vinyl pipes may be fixed to the cylindrical core 21 just so as to fit on the outer periphery thereof with an adhesive, thereby forming an annular concave portion 21a between the vinyl pipes.

In this embodiment, in the formed annular concave portion 21a, the insulating paper wound layer 22a using the same insulating paper as the insulating paper forming the capacitor cone is formed in this embodiment. Further, the insulating paper 22 is formed in a cone shape on the outer periphery to complete the capacitor cone.

The insulating paper 22 is usually oil-impregnated paper impregnated with insulating oil in advance.

The condenser cone of the present invention having the above-described structure is less likely to cause slippage between the cylindrical core 21 and the insulating paper 22 even when suspended using the crane 10 as shown in FIG. The problem of forming a gap between the insulating paper winding layers has been eliminated.

For the demonstration, a cylindrical core with a length of 4 meters and an inner diameter of 140 mm was used, and a capacitor cone was wound with insulating paper so that the outermost diameter was 250 mm. .

In this case, the lowermost insulating paper was wound so as to have a width of 2800 mm in the longitudinal direction of the condenser cone, and the uppermost insulating paper was wound so as to have a width of 800 mm.

The depth of the annular recess formed on the outer periphery of the cylindrical core 21 was about 5 mm, which is the same thickness as that of the cylindrical core 21. In the case of such a configuration, even when the cable was inserted into or removed from the cable by the crane, no displacement occurred between the insulating paper winding layers.

 The present invention is not limited to the above embodiment.

In the embodiment of the present invention shown in FIG.
Although the 21a is provided at three places sandwiching the two projecting portions 21b, this may be appropriately selected according to the entire length of the condenser cone, and the number may be increased or decreased.

In addition, if the width of the annular recess is made substantially equal to the width of the insulating paper wound therearound, the winding of the insulating paper in the annular recess can be facilitated.

(Effects of the Invention) The condenser cone of the present invention described above has an annular concave portion formed on the outer peripheral surface of the cylindrical core, and an insulating paper wound layer is formed so as to fill the concave portion, and then the insulation is formed in a cone shape. Since the paper is wound, it is possible to prevent the displacement between the insulating paper and the cylindrical core in the longitudinal direction, and to facilitate attachment and detachment to the cable end.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the condenser cone of the present invention, FIG. 2 is a longitudinal sectional view of a main part of a general cable terminal, and FIG.
FIGS. 4 and 5 are longitudinal sectional views of a main part of a condenser cone for explaining the effect of sliding when a conventional condenser cone is suspended. 20: condenser cone, 21: cylindrical core, 21a: annular concave portion, 21b: protruding portion, 22: insulating paper, 22a: insulating paper winding layer, 23: metal foil.

Claims (1)

(57) [Scope of request for utility model registration] An annular concave portion is formed on the outer peripheral surface of a cylindrical winding core, an insulating paper winding layer is formed so as to fill the concave portion, and the insulating paper is further wound around the outer periphery in a cone shape. Condenser cone.