RU26679U1 - HIGH VOLTAGE INPUT - Google Patents

Description

HIGH VOLTAGE INPUT

The utility model relates to electrical engineering, namely, to the inputs of various devices at voltages of 35-110 kV, having insulation from layers of electrical insulation paper glued with epoxy resin.

As external insulation, such bushings are, as a rule, porcelain insulators. One of the disadvantages of porcelain insulators is their fragility. US Pat. No. 3,875,327 bushing. Westinghouse Electric Co. Jerry L. Hildenbrand; Application JV235120 / 77, Bushing. Stated July 23, 1973, No. 80953/73 f. “Hitachi Seisakuse KK, Ikemoto Tetsuro. In addition, porcelain insulators have a large mass, a large complexity of manufacturing and, consequently, high cost.

The known design of the input high voltage Application No. 291373, Germany, High-voltage input for outdoor installation. Announced on April 5, 1979. No. P2913673.0. f. Felten Guilleaume Carlswerk. Weltgen Josef, containing a central pipe, connection sleeve and cast resin insulator body. The outer surface of the casing is covered with a sheath; the final shell is made of plastic or silicone rubber. Between the inner surface of this shell and the insulator body there is a layer of glue. Skirts from the same material of which the shell is made are put on the outer surface of this shell. Skirts are seamlessly bonded to the sheath through joint hot vulcanization. The design does not contain a porcelain insulator, insulating fluids that require reliable tight seals. The manufacturing and assembly process of this sushi design is significantly simplified while reducing material consumption.

MKIN01V17 / 26

The design has the following disadvantages. The adhesive layer between the inner surface of the shell and the body of the insulator does not prevent the diffusion of moisture from the environment. During operation, this leads to a gradual saturation of the adhesive layer with moisture, followed by a decrease in its dielectric properties. With long-term operation of such a layer in strong electric fields, the process of deterioration of dielectric properties is significantly accelerated, reducing the resource characteristics of the product as a whole.

Similar disadvantages are inherent in the interface between the skirts and the outer surface of the shell, despite the fact that, according to the authors of the design, the skirts are connected to the shell seamlessly through joint hot vulcanization. If the skirts are connected to a pre-fabricated shell, that is, at the next technological stage, then the interface between the shell and the skirts with any connection method cannot be considered as one with both the shell and the skirts. To prevent the diffusion of moisture from the environment, the authors propose the use of seals in the form of gaskets. However, this method cannot be considered effective, since gasket materials operating under compression and temperature cycles have a shorter service life than body materials, sheaths, and skirts.

The objective of the utility model is to create a high voltage input design with reduced material consumption compared to existing structures, which does not have insulating liquids, which require tightness control in operation, and also has a simplified manufacturing and assembly technology.

The technical result is achieved by the fact that the input of a high voltage containing a Central pipe, a protective shell with skirts, a connecting sleeve, contains screens with potential

central pipe located at the ends of the input, t a tubular element for regulating electric zero, on the inner and end parts of which are coated with conductive liquid silicone rubber with a specific volumetric electrical resistance of 1 -: - 5 Ohm-cm, the insulation is made of layers of insulating paper glued epoxy resin, moreover, the protective shell, skirts and tubular element for regulating the electric field are made in the form of a monolith, made of liquid silicone rubber, stitched at rooms second temperature and a metallic clamp force pressing end portion of the containment to the central tube.

According to one embodiment of the technical solution, the high voltage input can have a two-sided (relative to the connecting sleeve) protective shell with skirts for working in the air, according to another variant, one-sided, for the part of insulation free from the protective shell in the environment of insulating oil.

The utility model is illustrated in the drawing. Figure 1 presents a section of a General view of the design of the bushings up to 220 kV with the designation of external elements; figure 2 - remote sectional elements of a General view of the design of the bushings up to 220 kV on an enlarged scale.

As shown in figure 2, the proposed input design contains screens 1, a central pipe 2, insulation from layers of electrical paper glued with epoxy resin 3, a protective sheath 4, a tubular element for regulating the electric field 5, a metal clamp 6, a connecting sleeve 7 and a coating 8 from conductive silicone rubber.

The proposed design provides for the manufacture of a protective shell and skirts in one technological operation simultaneously by casting from liquid silicone rubber.

crosslinkable at room temperature. In this case, a chemical compound of insulation is formed from layers of electrical insulating paper glued with an epoxy resin with a protective sheath. A chemical bond also arises with the outer surface of the tubular electric field control element and with the end part of the central pipe. Regulation of the electric field with the help of a tubular element consists in creating on the external perimeter of the electrically conductive coating a value of tension equal to or close (10% difference) to the value of the tension on the edge perimeter of the insulation lining closest to the central pipe with the potential of the central pipe. For this purpose, the corresponding geometric configuration of the tubular electric field control element is selected.

To prevent peeling of the end part of the protective sheath from the central pipe, the design provides for the possibility of forcibly pressing the end part to the central pipe using a metal clamp. This makes it possible to prevent the diffusion of moisture from the environment.

The manufacturing process of the proposed input consists of three stages: manufacturing a tubular element for regulating the electric field 5, coated 8 from electrically conductive organosilicon rubber, manufacturing a protective shell with skirts 4, assembling the clamp 6 and screens 1.

Compared with the technology of manufacturing bushings, including modes of manufacturing insulation, porcelain insulators, assembly, etc. the manufacturing time of the proposed input design is reduced by at least 4 times.

The material consumption of the proposed design is reduced by 1.7 times for inputs with a double-sided protective shell, and 1.5 times - with one-sided.

Claims (2)

1. The input of a high voltage containing a Central pipe, a protective shell with skirts, a connecting sleeve, characterized in that it further comprises screens with the potential of the Central pipe located at the ends of the input, a tubular element for adjusting the electric field, the inner and end parts of which are coated of conductive liquid silicone rubber with a specific volume electric resistance of 1 ÷ 5 Ohm • cm, insulation made of layers of electrical paper glued with epoxy cm loi, wherein, the protective sheath and the tubular skirt of the electric field adjusting member formed as a monolith from a liquid silicone rubber crosslinkable at room temperature. 2. The input according to claim 1, characterized in that the end part of the protective shell is forcibly pressed by a metal clamp to the central pipe.