SU1424064A1 - High-voltage current transformer - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to save materials and improve reliability. The current transformer contains several annular magnetic cores 1 with secondary ampholes wound on them and covering them symmetrically with respect to axes X and X screen 2, which has in cross section an ellipsoid shape formed by conjugation of four arcs. The magnetic circuit 1 with the secondary windings and the screen 2 is located in the tank 5 in the form of a cylinder mated with a truncated cone. The primary winding passes through the tank. 2 Il. A (L s 4; u 4 O O5 4; FIG. 2.

Description

And the invention relates to electrical engineering, in particular, to measuring transformers, and can be used in designing reference high-voltage current transformers.

The aim of the invention is to save materials and increase reliability.

The gnitoprovods, the cross sections of which are coupled with the screen, provide a reduction in weight and dimensions due to more efficient filling of the working volume with active materials. At the same time, insulation 3 is wound more tightly onto screen 2, which increases its electrical power.

lia

FIG. 1 shows a transformer., Of durability and reliability. Experi2 - razvid sideways, cut; in FIG. a cut A — A in FIG. one.

The transformer contains several ring magnetic cores 1 with the optimal cross-sectional shape of the screen for current transformers of the class of 35-500 kV, with the radius of the central axial

The secondary windings on them, the tank channel, is selected within 4080 mm, the thickness of the insulation deposited on the screen is 15-150 mm, and the arc radius of the screen circumference K is within 400-800 mm. The radius of the Kz arc cdf and hea are selected in the range of 20-40 mm. A hollow conductive toroidal screen for ease of assembly is made of two parts with a cut in the plane passing through the Y-Y axis, and Z-Z ,.

The left, in the form of a toroidal body of rotation, symmetrical about the X axis - X screen 2, covering the secondary windings with magnetic cores, insulated on the screen 3, primary. - winding 4, tank .5 in the form of a cylinder, coupled with a truncated cone, symmetric about the axis ZZ, located above the porcelain lid 6 and hermetically attached to it. The axis 25 of the X-X symmetry of the screen and the Z-Z tank are mutually perpendicular. A tube 7 is attached to the screen, inside of which the ends of 8 secondary windings pass through a hole in the screen. The screen has an ellipsoid cross section formed by the conjugation of four circular arcs. The center O of the arc (abc) is located at the intersection point of the X - X axes. and Z-Z

thirty

By that, the screen with insulation applied to it fits well into the tank, filling its volume to the maximum, which contributes to reducing the size and weight of the transformer. The center of the arc fgh is in the plane formed by the axes Z-Z, and Y-Y, perpendicular to the axis X - X and passing through center 0.

The transformer works as follows.

The primary single turn winding 4 is included in the splitting of the tires on which the current is measured. The transformer tank 5 is mounted on a porcelain tire 6, in the form of S35

40

45

The use of the proposed current transformer in installations for a voltage of up to 500 kV makes it possible to reduce the consumption of insulating and structural materials by almost 2 times.

Claims (1)

Invention Formula High-voltage current transformer containing coaxially arranged annular magnetic cores carrying secondary windings, a hollow toroidal shield with solid insulation, encompassing the magnetic cores, primary winding, a cylinder in the form of a cylinder coupled to a truncated cone, the axis of symmetry of which is orthogonal to the axis of the screen, and an insulating tire with conclusions, characterized in that, in order to save materials and increase reliability, the screen is made with an ellipse-shaped section formed by conjugation of four arcs of circles, one of which has a center point of intersection of the axes of symmetry of the screen common function of the supporting insulator. Outputs-50 and the tank, the center of the circle, and the backdrops of the secondary windings 8 are connected to the measuring devices. The use of a hollow toroidal screen with an ellipsoidal cross-section encompassing annular The optimal cross-sectional shape of the screen for 35-500 kV class current transformers has been mentally established. The radius of the central axial The use of the proposed current transformer in installations for a voltage of up to 500 kV makes it possible to reduce the consumption of insulating and structural materials by almost 2 times. Invention Formula High-voltage current transformer containing coaxially arranged annular magnetic cores carrying secondary windings, a hollow toroidal shield with solid insulation, encompassing the magnetic cores, primary winding, a cylinder in the form of a cylinder coupled to a truncated cone, the axis of symmetry of which is orthogonal to the axis of the screen, and an insulating tire with conclusions, characterized in that, in order to save materials and increase reliability, the screen is made with an ellipse-shaped section formed by conjugation of four arcs of circles, one of which has a center point of intersection of the axes of symmetry of the screen The position of the arc is located on the axis of symmetry of the tank, while the outer diameters of the annular magnetic cores decrease from the middle to the extreme and the inner diameters increase. 1 g 1