SU1381407A1 - Four-terminal transformer resistance converter - Google Patents

Abstract

Ibretenie m. used in the construction of model measures and stores of large denominations. The purpose of the invention is to improve the accuracy of the impedance conversion. The device contains an exemplary electrical impedance I (PS), tr-p 2 with the first winding 3 and the second winding 4, tr-p 5 with the first winding 6, the second winding 7 and the third winding 8, tr-p 9 with the first winding 10 and the second winding 1I and the additional Hbrii el-12 PS. The regulation of the equivalent resistance of a transformer transformer of resistance is carried out by joint regulation of the number of turns of the windings 3, 7, 11, or by joint regulation of the values of elements 1 and 12. 1 sludge. With s

Description

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It is also an invention of electrical measuring equipment and can be used in constructing exemplary MVs and large capacitor capacities.

The purpose of the invention is to increase the accuracy of the impedance conversion.

Pa the drawing shows a circuit diagram of a four-phase transformer-type transformer of resistance.

The converter contains an exemplary element of the impedance 1, the first transformer 2 with G1 3 and the second 4 windings, the second tranche; 1 or tor S 6 with the second 6. 7 and the third 8 windings, the third transformer 9 with the first OT BTOpofi 11 windings, and an additional element 1 2 is full of resistance.

The four-pole transformer impedance converter operates as follows o6f) a3OM,

The second double A of the first transformer 2 is connected to a low-impedance load, which is made up of series-connected. Exemplary element 1 is full of resistance and an additional TH 3.iieN: eHT 2 field sonar that ensures the operation of this transformer 2 in mode If the current flows in the circuit of the second winding 4 on the reference element I and the additional element 12, a corresponding voltage drop occurs. Due to the influence of the magnetizing current of the core of the first transformer 2 and the battery and on the resistance of the resistors, the winding A 1Gpress on the model element 1 and the additional element 12 is not much less than it would be with an ideal current transformer. With the same resistances of the model element 1 and the additional element 12, the voltage on their clips should be one ;. However, the influence of the magnetizing current of the core of the second transformer 5 flowing through the first winding 6 creates the effect of shunting the exemplary element I by the first winding 6, and the voltage on the exemplary element 1 becomes less than the EMF on the first winding 6, we determine the output voltage. on the model element 1 minus the voltage drop

the residual resistances of the same winding are also reduced.

At the same time, the additional element 12 is practically not loaded. This is due to the fact that with the equal number of turns of the first winding 6 and the third winding 8 and the close inductive connection between them, the voltage

these windings are equal in magnitude and

close to the voltage on the additional element 1ent 12, therefore the voltage on the first winding 10, equal to the difference of the voltages on the additional element 12 and the third winding 8, is small, and therefore the current flowing through this area is also low.

Voltages on the first winding 6 and on the third winding 8, transforming,

on the second winding 7, the voltage is proportional to; proportional to the magnitude of the exemplary element 1. The voltage on the first winding 10 is equal to the voltage drop on the first winding 6, due to

the influence of current on - the curing of the heart | Ik of the second transformer 5 and the voltage drop on the residual resistances of the first winding 6, i.e. The magnitude of the error on the secondary transistor ator 5 is transformed into three winding 1. - Thus, -1: .1dränderment consists of the sum of the voltage; cap and the second with the battery 7 and the voltage compensated and on the second winding 1 1. By increasing the number of turns of BTopoj r winding 1 1, one can achieve not only compensation of the magnetizing current of the core of the second transformer 5, and voltage drops on the residual resistances of the first winding 6, but also compensation of the effect of current of the first transistor, and 2 the voltage drop on the residual resistances of the secondary RES1 winding 4. With equal resistance of the reference element 1 and the additional element 12, equality of the number of turns of the windings 4.6,8,10 and the same dimensions and magnetic

On the other hand, the state of the first transformer 2, the second transformer 5 and the third transformer 9 are maximally compensated for the error error at the number of turns of the second

windings 1 1 are 3 times greater than the number of turns of the second winding 7. This complements the errors of the first degree of smallness caused by the TOICOB magnetization of the transformer cores, and the errors caused by: a drop in voltage on the residual resistances of the second winding 4 and the first winding 6. When choosing the active resistance of the first winding 10, the resistance of the second winding A is twice as small, the errors caused by the voltage drop on the residual volts of volts can be fully compensated The winding of the winding 4 and the first winding 6. As a result, the equivalent resistance of the four-terminal transformer resistance converter is:

R

tzP17 /,,, c 4 l f 1

z, z -: b- (1-11.5 - -6 - r, |,

where Zt, is the total resistance of the model element I, equal to the resistance of the additional element 2; m, m,

m - turns of the windings 3,4,7; R is the active resistance of the second winding 4; x - reactance

the second winding 4. The equivalent resistance of the transformer converter can be controlled by jointly controlling the number of turns of the windings 3,7,1, or by jointly controlling the values of exemplary element I and additional element 12.

Formula and 3 about b ete e} 1 and

A four-clamping transformer impedance converter containing samples of the first impedance element, the first and second transformers with the first and second windings, the beginning of the second winding of the first transformer is connected to the beginning of the first winding of the second transformer 1 with the first output of the reference impedance element, the second output of which is connected with the end of the first winding of the second transformer, and the terminals of the first winding of the first transformer are the current input of the four-clamp transformer th transducer resistance, characterized in that,

5 in order to increase the accuracy of the impedance conversion, the additional element of the full resistance was introduced, the third transformer - (ator with the first and BTOpoi windings by the third

0 the winding of the second transformer, the first B1: 1 input of the additional impedance element is connected to the end of the first winding of the second transformer, and BTopoi, the output of the additional terminal element of full matching of the second winding of the first transformer and the end of the first winding of the third transformer, the beginning of the first winding which connects with 1 point of the third winding of the second transformer, and the end of the second winding of the second transformer connects with the beginning of the second winding of the third transformer, and the second outputs x GPL second and third trans Zyurmatorov are output transformer chetyrehzazhimnogo 1treobrazovatel resistance, pri- h JM beginning of the third winding of the second

The transformer is connected to the end of the first winding of the second transformer.

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Claims (1)

SUMMARY OF THE INVENTION Four-clamp transformer resistance converter containing an exemplary impedance element, first and second transformers with first and second windings, the beginning of the second winding of the first transformer is connected to the beginning of the first winding of the second transformer and to the first output of the exemplary impedance element, the second terminal of which is connected with the end of the first winding of the second transformer, and the conclusions of the first winding of the first transformer are the current input of the four-clamp transformer resistance converter, characterized in that, in order to increase the accuracy of the conversion of the impedance, an additional impedance element is introduced, a third transformer with first and second windings and a third winding of the second transformer, the first output of the additional impedance element is connected to the end of the first winding of the second transformer, and the second terminal of the additional impedance element is connected to the end of the second winding of the first transformer and to the end of the first windings of the third transformer, the beginning of the first winding of which is connected to the messenger of the third winding of the second transformer, and the end of the second winding of the second transformer is connected to the beginning of the second winding of the third transformer, and the second terminals of the second windings of the second and third transformers are the output of the four-clamp resistance transformer, and the beginning of the third winding the second transformer is connected to the end of the first winding of the second transformer.