Insulator spiral skirt

FIELD: electrical engineering.

SUBSTANCE: proposed method for producing spiral skirt 2 for high-voltage insulator 1 allows for manufacture of actually cylindrical backing 3, extruder 10 incorporating extrusion head 11 that governs extrusion direction A, makes use of extruder 10 for extruding insulator skirt 2 and application of the latter onto backing 3 while rotating this backing relative to extrusion head 11. Novelty is that extrusion direction A actually coincides with longitudinal axis of backing 3; the latter is fed through extrusion head 11. Skirt manufactured by this method can be used for high-voltage insulators, high-voltage lightning arresters, or high-voltage cable entries.

EFFECT: ability of producing high-voltage parts having relatively small diameter.

12 cl, 3 dwg

 

The present invention relates to spiral skirt of the insulator, in particular for high-voltage lines. More specifically, the present invention relates to a method for producing a spiral skirt insulator for high-voltage insulator, providing essentially cylindrical substrate, providing an extruder having an extrusion head, which determines the direction of extrusion, the use of the extruder for extruding the skirt of the insulator and causing the skirt of the insulator on the substrate while rotating the substrate relative to the extrusion head. A method of this type is described in U.S. patent No. 5973272 issued Sediver.

High-voltage elements and devices, such as insulators, arresters for protection against atmospheric overvoltages and cable glands can be provided with one or more skirts insulators to increase the length of the tracking dielectrics. Tracking is a well-known phenomenon of leakage currents flowing on the outer surface of the element. Lengthening the path of the leakage increases its resistance and accordingly reduces the current and any surface damages caused by current leakage. In this context, the term "high voltage" refers to voltages higher than 400 V, in particular more than 1000 and especially more than 5,000 Century

Traditionally on the outer surface of the high voltage is lementa have several separate annular skirt of the insulator. Skirts insulators may be etched, as described in international publication WO 94/29886, (Raychem). The skirt of the insulator can be combined in one element, as described in U.S. patent No. 5389742 (Raychem). In all such devices skirt insulator form a set of almost ring-shaped elements. In contrast, in patent United States No. 4833278 issued by Hydro-Quebec, described essentially spiral skirt of the insulator, derived from several connected segments of the skirt of the insulator. In the above-mentioned U.S. patent No. 5973272 serves to wind one T-shaped element skirt insulator on the pipe so as to provide a continuous spiral skirt of the insulator. The t-shaped element can be continuously extruded through the extruder head, which is located approximately at a right angle relative to the tube. The t-shaped element skirt insulator may nakativaetsa around the pipe during extrusion, providing the possibility of obtaining a single element with a spiral skirt of the insulator during a single operation.

Although the method described in U.S. patent No. 5973272 is very profitable, using the T-shaped structure necessarily limits the bend radius of the spiral skirt insulator. For this reason, the known method is not suitable for items that have a relatively small diameter is R. In addition, the mutual sealing of the adjacent turns of the T-shaped element skirt insulator cannot be guaranteed. As a result, dirt can accumulate in any gap between the coils and can reduce the surface resistance of the element, causing in accordance with this, the increase of the tracking or the amount of water that can permeate through the seal and cause electrical breakdown of the substrate. Another method described in the publication WO-A-99/10896, which similarly uses the extrusion skirt insulator in the transverse direction, results in the receipt of the connection lines between adjacent coils of the skirt of the insulator.

In accordance with the present invention is to eliminate the disadvantages of the prior art and to provide a method for obtaining a spiral skirt insulator, which is also suitable for high-voltage elements having a relatively small diameter.

Another objective of the present invention is to provide a method of producing spiral skirt insulator, which provides the possibility of continuous production process for products of great length.

Another object of the present invention is to provide a method of producing spiral skirt insulator, which guarantees excellent ger is etisal element.

An additional object of the present invention is to provide a high-voltage element, provided with a spiral skirt of the insulator.

In accordance with this method, described in the preamble corresponding to the present invention, characterized in that the direction of extrusion essentially coincides with the longitudinal axis of the substrate, and the material on the substrate is fed through the extrusion head.

Despite the obvious "wrong direction" this longitudinal extrusion of the skirt of the insulator in comparison with the known methods of extrusion in the transverse direction, the present invention originally and continuously provides satisfactory spiral skirt insulator, directly and continuously applied to the substrate. In addition, the integral tubular insulation covering the substrate can be extruded together, sealing the substrate, protecting it from exposure to the environment, education connection lines between adjacent coils of the skirt of the insulator.

Because spiral skirt of the insulator corresponding to the present invention, ekstragiruyut in the form of a curved element, it is possible to obtain skirts with much smaller diameters than skirts insulators obtained by winding in accordance with the prior art, in the essays which the skirt of the insulator ekstragiruyut in the form of a rectilinear element.

In a preferred embodiment of the present invention the substrate is rotating, while the extruder and the extrusion head are stationary. In an alternative embodiment, the extrusion head can rotate, while the substrate is stationary (not rotating), or perhaps to be able to rotate the substrate and die.

The substrate may include glass fiber rod, plastic tube or something like that. The material of the skirt of the insulator may contain silicone (silicone) resin, polyolefin and/or other suitable materials. The substrate may have a diameter of from 1 to 10 cm, and preferably from 1.5 to 5 cm

It should be noted that the spiral skirt of the insulator, suitable for high-voltage insulators, as a rule, also suitable for other high-voltage devices and elements, such as surge arresters for protection against atmospheric overvoltages, cable glands and so on.

The present invention additionally provides for the receipt of high-voltage elements, such as high voltage insulators, high voltage surge arresters for protection against atmospheric overvoltages, provided with spiral skirt of the insulator obtained by the method, which was described above, and with tubular insulation containing spiral skirt, get the SP is way which was described above.

The present invention will be further described below with reference to the accompanying drawings, in which

Figure 1 - schematic isometric view of obtaining spiral skirt insulator in a way consistent with the prior art;

Figure 2 - schematic top view illustrating a method of obtaining a spiral skirt of the insulator corresponding to the present invention;

Figure 3 - illustration of a high-voltage insulator, provided with spiral skirt of the insulator corresponding to the present invention.

A method of obtaining a spiral skirt insulator in accordance with U.S. patent No. 5973272 schematically illustrated in figure 1. Extrusion head 11 provides obtaining the skirt 2 of the insulator in the form of a strip essentially T-shaped cross-section, which is wound around a rotating substrate (high-voltage insulator) 3. The base strip is treated with a pressure on the substrate by means of pressure roller 12. Adjacent coils of the base strip to form a tubular insulation 4, which essentially covers the outer surface of the substrate 3.

Extrusion head 11 are oriented so that the direction And the extrusion was essentially perpendicular to the longitudinal direction and the axis of rotation of the substrate 3. As follows from figure 1, the original straight line is olosa bent around the substrate. Due to the fact that its cross section has a T-shaped configuration, the bend radius is inevitably limited.

Figure 2 schematically illustrates the method of obtaining spiral skirt of the insulator corresponding to the present invention. The substrate is inserted into the cylinder 11 of the extruder 10. The substrate, which may be a rod made of fiberglass, rotate around its longitudinal axis by a rotating means (not shown), which may be made as one unit with an extrusion head 11 and which also reports the translational motion of the substrate 3 through the extrusion head 11. The extruder causes continuous tubular insulation 4 on the substrate 3, and a spiral skirt 2 of the insulator is on top of the tubular insulation 4. The resulting design can be used as a high voltage insulator 1 is illustrated, for example, in figure 3.

As shown in figure 2, the direction And extruding coincides with the longitudinal axis of the substrate. The combination of extrusion in the axial direction and rotation enables easy application of spiral skirt insulator within a single operation.

You can use an auxiliary substrate having a smooth surface such as a pipe containing TEFLON®for the initial extrusion of the tubular insulation to support the nutrient substrate. Tubular insulation may be removed from the support substrate and then applied to another substrate. The supporting substrate may be a substrate amenable to reuse.

Thus, the skilled in this technical field specialists will be apparent that the present invention is not limited to the illustrated (in this application) implementation options and that without deviating from the scope of the present invention, which is limited in the appended claims, may be made many additions and modifications.

1. A method of obtaining a spiral skirt (2) insulator for high-voltage insulator, providing essentially cylindrical substrate (3); ensuring the extruder (10), having an extrusion head (11), defining the direction of extrusion (A); the use of the extruder (10) for extruding skirts (2) insulator, and a continuous tubular insulation (4); and the application of the skirt (2) insulator, and a continuous tubular insulation (4) on a substrate (3) while rotating the substrate (3) with respect to the extrusion head (11) with continuous tubular insulation (4), essentially covering the substrate (3), characterized in that specified direction (A) extruding essentially coincides with the longitudinal axis (B) of the substrate (3)and the substrate (3) are fed through the extrusion head (11).

2. The method according to claim 1, characterized in that it is subjected to rotation of the substrate.

3. The method according to claim 1, characterized in that it is subjected to rotation of the extrusion head.

4. The method according to claim 1, characterized in that the substrate contains glass fiber rod.

5. The method according to claim 1, characterized in that the material of the skirt of the insulator contains a silicone resin and/or polyolefin.

6. The method according to claim 1, characterized in that the substrate has a diameter in the range from 1 to 10 cm, and preferably from 1.5 to 5 cm

7. The method according to any of the preceding paragraphs, characterized in that the continuous tubular insulation (4) ekstragiruyut integrally with spiral skirt (2) insulator.

8. The method according to claim 7, characterized in that after extrusion of the tubular insulation is removed from the substrate and applied to another substrate.

9. The method according to claim 8, characterized in that the substrate (3) is a rod or tube having a surface of TEFLON®.

10. High-voltage insulator (1), containing spiral skirt (2) insulator obtained by the method according to any of the preceding paragraphs.

11. High-voltage arrester for protection against atmospheric overvoltages, containing spiral skirt (2) insulator obtained by the method according to any of the preceding paragraphs.

12. High-voltage cable entry containing spiral skirt (2) insulator obtained by the method according to any of predidushchem.



 

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