SU1479884A1 - Transformer ac bridge for loss tangent measurements - Google Patents

Abstract

The invention relates to electrical measuring technology and can be used to measure the loss tangent of complex resistances of a capacitive or inductive nature. The purpose of the invention is to improve the measurement accuracy of the loss-angle tangent-achieved by introducing into the structure of a bridge transformer circuit a second potentiometer 22, two additional resistors 21, 23, two additional windings 16, 17 of the comparator 13 currents, as well as functional connections between them and other measuring circuit elements. that provide for the creation of additional measuring currents, compensating separately the influence of the multiplicative and additive components of the measurement error of the loss tangent caused by the action of razitnyh active losses bridge. 1 il.

Description

Compiled by V.Semenchuk Editor T.Parfenova Tehred A.Kravchuk

Proofreader L. Patay

I /

Order 2539/44

Circulation 714

VNIIG1I State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 1P035, Moscow, Zh-35, 4/5 Raushsk nab.

Production and Shdagel Plant Patent, Uzhgorod, st. Gagarin, 101

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Claims (1)

Claim An AC transformer bridge for measuring the loss tangent, comprising a power source, the outputs of which are connected to the primary winding of the voltage transformer, one of the terminals of the primary winding is connected to a common bus, while the first terminal of the first secondary winding of the voltage transformer is connected to the first terminal for connecting the measurement object , the first terminal of the second secondary winding of the voltage transformer is connected to the first terminals of the exemplary measure of capacitance and the primary winding of the auxiliary transformer voltage, the first output of the first secondary winding of which is connected to the first output of the exemplary measure of resistance, the second output of which and the second output of the exemplary measure of capacitance are connected to the first output of the first winding of the current comparator, the first output of the second winding of the current comparator is connected второйο the second terminal for connecting the measurement object, the third winding of the current comparator is connected to the inputs of the equilibrium detector, one of the inputs of which, the second terminals of the first and second secondary windings of the voltage transformer, the second terminal the primary winding of auxiliary ¹ of the voltage transformer and the second terminals of the first two windings of the current comparator are connected to a common bus, a potentiometer, the external terminals of which are connected to an additional winding of the auxiliary voltage transformer, the middle terminal of which is connected to a common bus, so that in order to improve the accuracy of measuring the loss tangent, a second potentiometer, two additional resistors are introduced into it, and the external terminals of the second potentiometer are connected to the first additional current comparator winding, the middle terminal of which is connected to a common bus, the middle terminal of the second potentiometer is connected 5 with the first terminal of the first additional resistor, the second terminal of which is connected to the first terminal of the first secondary winding of the auxiliary voltage transformer ₁₀ , and the middle terminal of the first potentiometer is connected to the first terminal of the second additional resistor, the second terminal of which is connected to the first terminal of the second additional winding of the current comparator, second the output of which is connected to a common bus.