RU2150762C1 - High-voltage potential transformer - Google Patents

Abstract

FIELD: high- and superhigh-voltage instrument transformers. SUBSTANCE: transformer has metal case filled with insulating material and accommodating rectangular magnetic core shielded by electrostatic screens. The latter close, respectively, two side and one bottom yokes of core. Main and auxiliary low-voltage windings are wound on core legs. High-voltage winding is wound on low-voltage main winding and closed with electrostatic screen. The latter has two or more through slits over its generating line. Screen parts are joined together at one slit by means of insulating brace and at other ones, by using metal braces. Screen is connected to line end of winding through metal tube. All these measures prevent impact of radial and axial thrusts on winding. EFFECT: improved reliability of transformer. 1 dwg

Description

 The invention relates to electrical engineering and can be used in the design of measuring transformers of high and ultra-high voltage with insulating filling.

 The closest in technical essence and the achieved result is a high-voltage voltage transformer containing a metal casing filled with an insulating medium, inside of which there is a rectangular magnetic circuit with electrostatic screens covering two side and one lower yoke of the magnetic circuit, with the main and additional low voltage windings wound over the core of the magnetic circuit and a high voltage winding wound on top of the main low voltage winding and closed electrical a static screen connected to its linear end, and a metal current lead pipe fixed in an electrostatic screen / 1 /.

 The known design of the transformer provides a fairly equal distribution of lightning impulse voltage across the higher voltage winding, a fairly uniform distribution of the electrostatic field in the insulating medium and low consumption of active materials (electrical steel and winding wire).

 However, this design has low reliability due to the danger of windings or wire breaks in the high voltage winding, which can occur due to complex technological operations when putting on an electrostatic shield with a single cut on the high voltage winding.

 The objective of the invention is to increase the reliability of the transformer.

 This problem is solved in such a way that in a high-voltage voltage transformer containing a metal case filled with an insulating medium, inside which a rectangular magnetic circuit with electrostatic shields is installed, covering two side and one lower yoke of the magnetic circuit, with the main and additional low voltage windings wound over the core of the magnetic circuit, and a high voltage winding wound over the main low voltage winding and covered by an electrostatic shield connected with its linear end, and a metal current-conducting pipe fixed in an electrostatic screen, the electrostatic screen covering the high voltage winding is made with two or more through cuts along its generatrix, while the connection of the screen parts in one section is made by means of an insulating screed, and in the rest others by means of a metal coupler.

 The drawing shows a high voltage voltage transformer made in accordance with this invention.

 The transformer contains a metal case 1 filled with an insulating medium, inside of which there is a rectangular magnetic core 2 with electrostatic shields 3, 4 and 5, which cover two side and one lower yokes of the magnetic core 2, respectively, with the main 6 and additional 7 low voltage windings (HH1) and (HH2 ), wound over the rod 8 of the magnetic circuit 2, a high voltage (HV) winding 9, wound over the main low voltage winding 6 and closed by an electrostatic screen 10 made with two or more through ra with cuts 11.1, 11.2 ... 11.n along its generatrix, while the connection of the screen parts in one section is made by means of an insulating screed 12, and in the rest by means of metal screeds 13.1. . .13.n. The connection of the screen 10 with the linear end of the winding 9 (BH) (not shown) is carried out by a metal pipe 14 of the current output, fixed in the electrostatic screen 10.

 Separation of the electrostatic screen 10 through the through cuts 11.1, 11.2 ... 11.n allows you to lay parts of the screen 10 on the winding 9 (HV), to strengthen these parts on the winding with a temporary technological bandage, and then connect the screen parts with insulating 12 and metal 13 ties, after bringing the temporary technology bandage off. This design eliminates the effect of radial and axial forces on the winding 9 (VN), which would occur when donning an electrostatic screen with a single cut, as in the known device.

 Thus, the proposed transformer has greater reliability compared to the prototype.

Sources of information
1. The application of Germany N 2452056, CL H 01 F 40/04, op. 1976

Claims (1)

 A high-voltage voltage transformer containing a metal casing filled with an insulating medium, inside of which there is a rectangular magnetic circuit with electrostatic screens covering two side and one lower yokes of the magnetic circuit, with main and additional low voltage windings wound over the core of the magnetic circuit, and a higher voltage winding wound over the main low voltage windings and a closed electrostatic shield connected to its linear end and a metal pipe a current lead fixed in an electrostatic screen, characterized in that the electrostatic screen covering the high voltage winding is made with two or more through cuts along its generatrix, while the connection of the screen parts in one section is made by means of an insulating screed, and in the rest by metal screeds.