RU14290U1 - Inductive voltage divider - Google Patents

Abstract

An inductive voltage divider comprising a winding of a senior stage located on one core made in the form of series-connected sections, and a sectioned winding of a younger stage, one of the inputs of the divider through a switch connected to one of the outputs of the sections of the winding of the senior stage, which is connected in series with the winding of the younger stage through another switch connected to the conclusions of its sections, characterized in that additional symmetrical windings are inserted into it, which are wound on a burn ohm together with measuring windings divider respective sections on one or rectangular magnetic circuit of the toroidal section, the balun coil adjacent sections includes oppositely relative to each other.

Description

Inductive voltage divider

Inductive voltage divider refers to electrical engineering and is intended for use as a precision scale converter in a wide range of input voltages.

Known transformer voltage divider 1, consisting of autotransformers. The division coefficient of each of the autotransformers is 0.5, and half of the main windings of the autotransformers are connected in parallel, which ensures equalization of voltage across the windings due to the flow of balancing currents.

The disadvantages of the known transformer voltage divider are that the divider uses only the electrical connection between the stages. The lack of magnetic coupling between the stages of the divider entails low accuracy of division of the transformer voltage divider.

complete in the form of series-connected sections, and a seeded coil of the junior cascade, one of the inputs of the divider through a switch connected to one of the outputs of the sections of the winding of the senior cascade, which is connected in series with the winding of the younger cascade through another switch connected to the conclusions of its section.

The disadvantage of this inductive voltage divider (prototype) is that the use of only magnetic coupling between the stages of the divider results in low accuracy of the rsuctive voltage divider due to distortion of the division results due to the inhomogeneity of the divider magnetic circuit.

The problem to which the claimed utility model is directed is to develop a technical solution that will provide the following; its technical result: an increase in fission accuracy due to the use of an electric and magnetic coupling between the cascades in the divider.

This problem is solved as a result of the fact that the inductive voltage divider contains the winding of the senior stage located on the same core, made in the form of series-connected sections, and the sectioned winding of the younger stage, moreover, one of the inputs of the divider is connected via a switch to one of the outputs of the sections of the senior winding cascade, which is connected in series with the winding of the junior cascade through another switch connected to the terminals of its sections, additional symmetrically windings are introduced, to which are wound with a bundle together with the measuring windings correspondingly; their divider sections on one magnetic circuit of a U-shaped or toroidal cross section, moreover, the windings of adjacent sections are symmetrically turned on opposite to each other.

In FIG. 1 is a diagram of an inductive voltage divider, which contains located on the core 1 of the section 2, 3, 4 of the measuring winding of the senior stage, sections 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 of the measuring winding of the younger stage. In addition, the inductive voltage divider contains additional balancing windings 15, 16, 17, 18, 19, 20, designed to balance the currents in the measuring windings of the divider. The potential input of the divider through the switch 21 is connected to one of the conclusions of the sections 2, 3, 4 of the senior stage, which is connected in series with one of the conclusions of the sections 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 of the younger stage switch 22.

The measuring windings 2 ... 14 and the balancing windings 15 ... 20 are closely twisted together into a common bundle, wound around U-shaped or toroidal (not shown in Fig. 1) magnetic cores with a relatively high magnetic permeability, which ensures close inductive connection between the wires of the windings and high accuracy of voltage division.

The input voltage is applied to the terminals 23, 24, the output voltage is removed from the terminals 25, 26.

The input voltage of the divider changes with: and the switch

21from UBX TO 1.0 UBX in steps of 0.25 UBX and via switch

22 from 0 to 0.25 UBX in steps of 0.025 UBX The operation of the inductive voltage divider is as follows. The input voltage UBX is applied to the terminals 23, 24. The conversion factor of the divider is set by the position of the switches 21,22. Through sections 2, 3, 4 of the winding of the senior cascade and through sections 5 ... 14 of the winding of the younger cascade, connected by a switch 21, a common current flows, and they are connected by a common magnetic flux. The error in de: shtel division caused by the presence of only magnetic coupling between the divider cascade sections and the inhomogeneity of the divider core material is compensated by the introduction of additional balancing windings 15 ... 20. The windings 15 ... 20 are oppositely connected in opposite directions and provide electrical connection between sections of the cascades of the divider, compensating for the errors of division of the divider due to the flow of balancing currents along them. The output voltage of the UBLIX resistive voltage divider is removed from section 14 of the junior stage through terminals 25, 26.

The use of additional symmetrical windings 15 ... 20, providing electrical connection between sections of the cascade windings, to compensate for faults caused by the heterogeneity of the material of the magnetic circuit, provides high accuracy of division of the inductive voltage divider in a wide range of input voltages. In this case, permalloy with high magnetic permeability was used as the material of the magnetic circuit.

Thus, the proposed technical solution provides the construction of IDN in a wide range of input voltages with high fission accuracy.

Posted by: ff // W r DI. Nefedyev

1.Banks V.M. Transformer dividers voltage. -M .: Mechanical Engineering, 1984. -P.41-42.

2.Akhmadov A.A.-B., Butenko O.G. Inductive voltage divider. A.S. No. 1386917 (USSR). Onubl. in B.I. No. 13, 07/07/88.

Literature

Claims (1)

An inductive voltage divider comprising windings of a senior cascade arranged in series in the form of series-connected sections located on one core and a sectioned winding of a junior cascade, one of the inputs of the divider through a switch connected to one of the terminals of the sections of the winding of the senior cascade, which is connected in series with the winding of the younger cascade through another switch connected to the conclusions of its sections, characterized in that additional symmetrical windings are inserted into it, which are wound on a burn ohm together with measuring windings divider respective sections on one or rectangular magnetic circuit of the toroidal section, the balun coil adjacent sections includes oppositely relative to each other.