RU121957U1 - HIGH VOLTAGE MEASURING GAS-FILLED VOLTAGE TRANSFORMER - Google Patents

Abstract

High-voltage measuring gas-filled voltage transformer containing an active part consisting of a block of windings made in the form of several low voltage windings and a concentrically wound high-voltage winding with capacitor-type insulation in the form of alternating layers of electrical insulating and conducting materials, a magnetic circuit, electrostatic shields, put on yokes and the lower rod of the magnetic circuit, and a high-potential shield, fixed on the block of windings, while the active part is fixed with a frame in a metal tank filled with insulating gas under pressure, characterized in that the magnetic circuit is made of strip steel and cut into two halves, fastened to each other with another metal tie, the high-potential screen is made of a cylindrical shell, two additional shells fixed at opposite ends of the cylindrical shell; a cut is made along the generatrix of the screen, and a plate of electrically insulating material is fixed on the shell between the ends of the cut; a metal rod is fixed on the high-potential screen, placed in a metal pipe, to which a wire is connected, the other end of which is fixed on the upper flange of the insulator; a rod with a wire is placed in a metal tube, one end of which is fixed on the upper flange of the insulator, and the other end is surrounded by an additional rounded screen, which is located at a distance of at least 5 mm from the high-potential winding screen; the active part is fixed between two parts of the metal frame installed in the tank; to the tank through the seals

Description

The utility model relates to electrical engineering and can be used in the design and manufacture of gas-filled voltage transformers.

Known transformer, which contains a metal body filled with an insulating medium, inside which is installed a rectangular magnetic circuit with electrostatic screens. The screens are closed, respectively, two side and one lower yoke of the magnetic circuit. The main and additional low voltage windings are wound over the core of the magnetic circuit. A high voltage winding is wound over the main low voltage winding and is covered by an electrostatic shield. The screen is made with two or more through cuts along its generatrix. The connection of the screen parts in one section is made by means of an insulating screed, and in the other others, by means of metal screeds. The screen is connected to the linear end of the winding by a metal pipe (RF patent No. 2150762, H01F 38/26, H01F 27/36, publ. 10.06.2000).

The reliability of this transformer is low due to the lack of reliable mounting of the screen.

A known transformer for high-voltage installations with gas insulation, containing a tank filled with insulating gas under pressure and having a flange for connection to the installation, a magnetic circuit with low-voltage and high-voltage windings, insulation between them, intermediate screens of a cylindrical shape and a hollow high-potential screen having the potential of a high-voltage winding, in which the high-voltage winding is located inside the hollow high-potential screen, the intermediate screens are installed in the inter-winding insulation of the condens itator type in the form of alternating layers of electrical insulating and conductive materials (AS USSR No. 1042090, H01F 30/10, H01F 27/36, publ. 09/15/1983).

This transformer is quite complex and low-tech in the assembly due to the use of a charged magnetic core.

The utility model is based on the task of creating a high-voltage gas-filled voltage transformer characterized by high adaptability in the manufacture and assembly of the product and increased reliability that prevents mechanical impact on the windings and the magnetic circuit.

The solution to the technical problem is ensured by the fact that in a high-voltage gas-filled voltage transformer containing an active part consisting of a block of windings made in the form of several low-voltage windings and a concentric high-voltage winding wound on them with capacitor-type insulation in the form of alternating layers of electrical insulating and conductive materials, magnetic circuit, electrostatic screens worn on the yokes and lower core of the magnetic circuit, and a high-potential screen, on the winding block, while the active part is fixed with a frame in a metal tank filled with insulating gas under pressure, the magnetic circuit is made of steel tape and cut into two halves, fastened to each other by a metal coupler, a high-potential screen is made of a cylindrical shell, two additional shells attached to opposite ends of the cylindrical shell; a cut was made along the generatrix of the screen, and a plate of insulating material was fixed on the side between the ends of the cut; a metal rod is fixed on a high-potential screen, placed in a metal pipe to which a wire is attached, the other end of which is fixed to the upper flange of the insulator; the rod with the wire is placed in a metal pipe, one end of which is fixed on the upper flange of the insulator, and the other end is surrounded by an additional rounded screen, which is placed at a distance of at least 5 mm from the high-potential winding screen; the active part is fixed between two parts of a metal frame installed in the tank; a hollow insulator is installed on the tank through the seals, to the upper end of which a high voltage input is connected.

Since the magnetic circuit is sandwiched between the parts of the frame, it does not perceive mechanical loads, which increases the reliability of the structure.

The separation of the magnetic circuit into two parts and the presence of a high-potential screen, consisting of three parts, simplifies the assembly of the active part of the transformer and improves its manufacturability, which is especially important in mass production.

High voltage input is carried out using a rod and a copper wire placed in a metal pipe equipped with a screen and not touching the winding screen, which eliminates the mechanical impact on the winding.

Thus, the proposed design of the voltage transformer differs from the known high manufacturability and increased reliability due to the exclusion of mechanical stresses on the winding block and the magnetic circuit.

The utility model is illustrated using FIG. 1, which shows a high voltage measuring gas-filled voltage transformer, and FIG. 2, which shows the active part of the transformer.

The voltage transformer consists of a metal tank 1, equipped with connecting flanges 2, the bottom plate 3, together forming a transformer housing. A hollow porcelain or polymer insulator 4 is installed on the tank 1 using seals, to the upper flange 5 of which a high voltage input is attached. 6. The active part 7 of the transformer is a capacitor type winding, and the high-voltage winding is wound on low-voltage windings (up to three pieces), together forming a winding block 8. The winding block 8 is fixed to the magnetic circuit 9, made of steel strip and cut into two halves, fastened a metal coupler 10. A high-potential shield 11 is connected concentrically to the winding block 8, connected to the output of the high-voltage winding 12, the other end of which is grounded. Shields with rounded edges 13 are put on the yoke and the lower core of the magnetic circuit 9. The active part 7 is fixed between two parts of the metal frame 14 with four screws with insulating gaskets. The frame 14 is equipped with fixing devices with which the active part 7 is fixed in the tank 1 of the housing. The output of the high potential 12 is carried out using a metal rod 15 mounted on a high-potential screen 11, to which a copper wire 16 is attached, the other end of which is fixed to the upper flange of the insulator 4. The rod 15 with the wire 16 is placed in a metal pipe 17, one end of which is fixed to the upper flange of the insulator 4, and the other end is provided with a rounded screen 18, which is located at a distance of at least 5 mm from the high potential screen 11 of the winding 12. The high potential screen 11 is made of a cylindrical shell ki 19, two complementary shells 20, attached to opposite ends of the sleeve 19 and is provided with a kerf made along the generatrix of the sleeve 21. At 19, 20 between the ends of the cutting insert 21 is secured in the electrically insulating material 22.

The transformer is assembled in the following sequence:

In the process of assembling the active part 7, two halves of the magnetic circuit 9 are fixed opposite each other in a special device. A coupler 10 is put on them. A shell 19,20 of the screen 11, screens 13, fasteners and flanges are put on the winding block 8. The structure obtained in this way is inserted between the halves of the magnetic circuit 9, the coupler 10 is pulled into the hole of the winding block 8 and the whole structure is pulled together by a coupler and bolted to one side of the magnetic circuit. The block of windings 8 is fixed to the magnetic circuit 9 using wedges. Next, the high-voltage input 12, which is an insulated wire with a ferrule, is fixed to the shell 19 with a bolt. The shell 19 is fixed to the block of windings 8 with the help of three bolts, twisting out of it until it stops on special platforms on the block of windings 8. The insulating plate 22 is attached to the shell with screws. The shells 20 are fixed to the shells 19 with screws. Next, the resulting design is pulled together between the two halves of the frame 14 using hexagon screws and bolts. Next, two previously worn on the block of windings of the screen 13 with the help of insulating fasteners are fixed on the halves of the frame 14. The lower screen 13 is also fixed with screws. Next, a rod 15 is screwed into a special hole.

When assembling the transformer itself, the assembled active part 7 is fixed to the special brackets of the tank 1, a plate 3 is attached to the bottom of the connecting flange 2, and a high-voltage shield and insulator 4 are mounted on top using fasteners. A wire 16 is attached to the input 6, the other end of which is screwed to the rod 15, and the pipe 17, on the opposite end of which is installed the screen 18. The whole structure with the help of fasteners is installed on the flange 5.

Next, the output ends of the winding block 8 are connected according to the diagram and the terminal block casing is put on.

Claims (1)

A high-voltage gas-filled voltage transformer containing an active part consisting of a block of windings made in the form of several low-voltage windings and a concentric high-voltage winding wound on them with capacitor-type insulation in the form of alternating layers of electrical and conductive materials, a magnetic circuit, electrostatic screens worn on yokes and the lower core of the magnetic circuit, and high-potential screen, mounted on the block of windings, while the active part is fixed It is made using a frame in a metal tank filled with insulating gas under pressure, characterized in that the magnetic circuit is made of strip steel and cut into two halves fastened to each other by a metal coupler, a high-potential screen is made of a cylindrical shell, two additional shells mounted on opposite ends of a cylindrical shell; a cut was made along the generatrix of the screen, and a plate of electrical insulating material was fixed on the side between the ends of the cut; a metal rod is fixed on a high-potential screen, placed in a metal pipe to which a wire is attached, the other end of which is fixed to the upper flange of the insulator; the rod with the wire is placed in a metal pipe, one end of which is fixed on the upper flange of the insulator, and the other end is surrounded by an additional rounded screen, which is placed at a distance of at least 5 mm from the high-potential winding screen; the active part is fixed between two parts of a metal frame installed in the tank; a hollow insulator is installed on the tank through the seals, to the upper end of which a high voltage input is connected.