SU587885A3 - Voltage transformer - Google Patents

Description

one

The invention relates to electrical engineering, in particular, to devices for measuring voltage in high-voltage networks and supplying voltage circuits to relay equipment.

A voltage transformer is known, comprising a magnetic conductor, a primary and a secondary winding. The secondary winding is located directly on the transformer magnetic core, on top of the winding is a main insulator, made of coaxially arranged telescopically offset tubular elements made of metal foil, between which there are tubular-shaped insulating elements, and on top of the insulator the primary winding of transformer 1 is placed.

The disadvantage of such a transformer is the large size due to the large cross-sectional area of the magnetic core or a large number of turns of the windings needed to obtain a high inductance, which in turn leads to a high cost of the entire device.

The purpose of the invention is to reduce the size of the device and reduce costs.

For this purpose, the voltage transformer magnetic circuit contains an external part consisting of an annular and cylindrical, made of alternating in axial direction (rings of ferromagnetic material and insulation of parts. The diameter of the internal part of the magnetic circuit corresponds to the internal diameter of the main insulator, one of The windings, for example, primary, are located between the non-cylindrical cylindrical part of the magnetic circuit and the main insulator, and the other, for example secondary, is located in the groove, between the internal part of the magnetic circuit, and the main . An apparent insulator and both are arranged on opposite sides of the main insulator, at its end portion of the main Moreover insulator located on one side of the magnetic circuit in the axial direction, and the other - is supported on the end face of the inner part of the magnetic circuit.

The drawing shows the described voltage transformer, a general view.

The voltage transformer contains a hollow support insulator 1, a main insulator 2, made of coaxially arranged tubular elements telescopically displaced relative to each other. Of metal foil, between which are insulating elements of a tubular form, cylindrical, at least one monolayer primary 3 and one secondary 4 concentrically located windings placed on a magnetic circuit made of two parts, internal 5 and external. Moreover, the diameter of the inner part corresponds to the inner diameter of the main insulator, and the outer part is located at the end of the main insulator and consists of an annular 6 and a cylindrical 7, made of alternating axially of ferromagnetic material and insulating parts. One of the windings, for example, primary 3, is located between the outer cylindrical part 7 of the magnetowire and the main insulator 2, and the other, for example secondary 4, is located in the slot, between the inner part 5 of the magnetic conductor and the main insulator 2 and both of them are located on opposite sides of the main isolator, at its end.

The length of the main insulator must lie within 2H + H, where H is the minimum distance over which the voltage in the axial direction of the supporting insulator can be distributed, it is equal to the sections of the main insulator at which the tubular elements are telescopically displaced relative to each other; H is the distance equal to the height of the annular part of the external magnetic circuit.

The inner part 5 of the magnetic circuit, the tubular element from the metal foil of the main insulator 2 adjacent to it, the part of the primary winding and the part of the cylindrical magnetic core placed on the end surface of the inner part 5 of the magnetic conductor are galvanically connected to each other and to the ground. The outer part of the magnetic circuit, in particular the ring 6, the adjacent tubular element of the metal foil of the main insulator 2, the part of the primary winding and the part of the cylindrical magnetic core adjacent to the ring part of the magnetic circuit 6 are also galvanically connected to each other and can be at high potential relative to land.

Claims (2)

1. A voltage transformer containing a hollow support insulator, a main insulator made of coaxially arranged telescopically shifted tubular elements made from metal foil, between which there are insulating elements of tubular form, cylindrical, at least one primary and one secondary located concentric windings placed on a magnetic core, the inner part of which is cylindrical in shape, characterized in that, in order to reduce overall dimensions and reduce cost, the magnetic core contains an outer part consisting of an annular and cylindrical, made of axially alternating rings of ferromagnetic material and insulating parts, and the diameter of the inner part of the magnetic core corresponds to the inner diameter of the main insulator, one of the windings, for example, primary, located between the outer cylindrical part of the magnetic circuit and the main insulator, and the other, for example secondary, - in the groove, between the inner part of the magnetic core and the main insulator m and both of them are located on opposite sides of the main insulator, at its end. 2. A transformer according to claim 1, wherein a part of the main insulator is located on one side of the magnetic conductor in the axial direction, and the other rests on the end surface of the internal part of the magnetic conductor. Sources of information taken into account in the examination: 1. Petrov G. N. Electric machines, part 1. M.-L., Gosenergoizdat, 1956, p. 179. -r