SU1033985A2 - Converter of transformer pickup parameters in the period of electrical oscillation - Google Patents

Abstract

CONVERTER PARAMETERS OF TRANSFORMER SENSORS - DURING ELECTRIC VIBRATIONS - Auth. 838610, characterized in that, in order to improve accuracy and expand functional possibilities. The second converter, a switch, two controllable dividers, a voltage and a converter, are introduced into it. voltage to current, the second input of the first switch is connected to the output of the comparator unit and to the input of the first controllable voltage divider,: the output of which is connected to the third input. the first switch -I to the first input of the adder, the first the input of the second switch is connected to the second input of the adder and to the output of the second controlled voltage divider, the input of which is connected to the second input of the second switch, to the integrator output and to the input of a voltage-to-current converter connected to the transformer the matrix sensor and the third input of the adder, the output of which is connected to the control input of the first i (the left controlled, voltage divider and to the input of the differentiator, is connected to the control input of the second controlled splitter Hssr and Outputs GoboRiz: Switches § U1ood.Luxed to the corresponding inputs of the comparison unit. 00 00 from 00 SP

Description

The invention relates to a measuring technique and can be used to measure the parameters of transformer and inductive sensors in the process of their manufacture and "operation." The reciprocal inductance converter during the pulse period is known, which contains a voltage converter into a sawtooth current, the output of which is connected through the primary winding of the transformer sensor and the supporting element RQ to the ground bus, and the secondary winding is connected to the common connection point of the primary cheating and 0por element. You-. The stroke of the comparison device is connected to the input of the voltage-to-saw converter. The disadvantage of this device is limited functionality, which consists in the impossibility of measuring the inductance and resistance of the primary and secondary windings of the transformer. Also known is a converter of the R, -L, and C circuits during the period of electrical oscillations / containing a series-connected adder, a comparator unit, an integrator, a zero-organ (limiting amplifier} and a dc amplifier, at the input and in. the negative feedback of which is connected, respectively, to the reference element and the .expandable circuit, the second inputs of the amplifiers of the direct current and the zero-body are connected to the housing, the second input of the adder is connected to the output of the integrator, the second input of the unit is compared to through divider with its output (2}.;; The disadvantage of this converter is the limited functional possibilities, which imply that it is impossible to convert the parameters of transformers and transformer format sensors in the period of generic oscillations. On the main bus number 838610- it is known : converter of parameters of transformer sensors in the period of electrical oscillations, containing series-connected comparison unit, integrator, input which is connected to the output of comparison unit, null-Organ, converter for example in jJftJobraznyy current ipaH format sensor, podklzo output. connected to the first input of the switch. and differentiator 3. The disadvantages of this device are the presence of inductance conversion error, due to the influence of active resistance when the condition of exact shift by T / 4 pulses of the comparator unit relative to the pulses from the null organ is not fulfilled due to the presence of a dead zone in the null organ and different slopes of the sawtooth voltage of the integrator in the adjacent half periods, as well as limited functionality, which is the impossibility of converting the constant time of the sensor windings ka (4 to frequency I signal. The purpose of the invention is to improve the accuracy and expand the functionality of the transformer parameter transformer sensors into frequency signals. The goal is achieved there that the converter containing the adder, differentiator, switch, comparison unit and integrator whose input is connected to the output of the comparator unit, the output of the transformer sensor is connected to the first input of the switch, and the connection terminal of the primary and secondary windings of the sensor is connected to the housing, a switch, two controllable voltage dividers and a voltage-to-current converter, the second input of the first switch connected to the output of the comparator unit and to the input of the first controlled voltage divider. nor, the output of which is connected to the third input of the first, switch and. To the first input of the adder, the first input of the second switch is connected to the second input of the adder and to the output of the second controlled voltage divider, whose input is connected to the second input of the second switch, to the integrator output and to the input P reattachment of the voltage to the current connected to the input of the transformer sensor and the third input of the adder, the output of which is connected to the control input of the first controlled voltage divider and to the input of a differentiator connected to the control input of the second controlled divider voltage, and the outputs of both switches are connected to the corresponding inputs of the comparison unit. I. The drawing shows a functional diagram of the proposed device. The device contains a unit 1 of comparison, two switches 2 and. 3, two controllable dividers 4 and b voltage, integrator 5, voltage-to-current converter 7, transformer sensor 8, adder 9 and differentiator 10. The device operates as follows. In the steady state mode of operation at the output of the comparison unit 1, a rectangular shape voltage with amplitude V-I acts, which is input to the integrator 5, the voltage of which is written in the form where T is the integral time of the integrator. This voltage is applied to the input of a voltage / current converter 7 at the output of which the current is determined by the expression. . , V2V. where K is the voltage conversion factor to Current. At the same time, the primary winding 1 and of the formator sensor 8 is removed. The voltage is defined as follows: x V IT TTxU rV When current J flows through the primary winding in the secondary winding of the transformer sensor 8, a rectangular shape is generated with EMF is proportional to Mj and the derivative of the current e, i.e. In addition, the voltage from the integrator output is fed to the input of a controlled voltage divider 4 with a variable transmission coefficient

those.

VV,

(S)

and the voltage from the output of the unit 1 of comparison to the input of the controlled voltage separator b with varying

transfer ratio

those

(6)

, ti,.

bio Voltages from the output of the dividers 4 and are fed to the inputs of the adder 9, where the voltage from the primary winding of the transformer sensor is subtracted from the signal, resulting in the output of the adder 9 through the voltage v, t7-- i 6-v 4- (T This voltage affects the transfer coefficient of the controlled voltage divider 4, changing it in such a way as to ensure the condition. In addition, the voltage Ug is applied to the differentiator 10, where it differentiates, and i (). (9) where TD - constant differentiation time. This voltage was carried

(14)

If switch 2 is in the 111 position, and switch 3 is in the P position, because of the equality of the voltages (11 and (1)

we obtain acts on the transmission coefficient g (the controlled voltage divider b, changing it in such a way as to ensure the condition of equality of the zero saw-tooth matching voltage Ug, i.e., 14tg, t -.-; as a result of reaching conditions i8) and (10) we get, AND :-) n. (t2), 1 t The voltages Ug jj, V n and, are given to the corresponding inputs of switches 2 and 3, the output of which is fed to the inputs of the unit 1 of the comparison. At moments of equal and voltage at the inputs of the comparison unit 1, its output voltage abruptly changes its sign to the opposite and the whole process repeats as it was considered. If switch 2 is in position 11 and switch 3 is in position 1, then the frequency of the generated oscillations will be found from the equality of the signals at the inputs of the comparison unit 1. , (О) -4If switch 3 in clause II, and switch 2 in position 1, we obtain from the equality of voltages (4) and (2). t -4- X 1c If the switch 3 is in position I and switch 2 in position 111 from equality of the voltages (11) HU2) we obtain If we connect a voltage to current instead of the primary winding to the output of the voltage converter 7, then we can convert the inductance and

Claims (1)

TRANSFORMER TRANSFORMER SENSOR CONVERTER · DURING ELECTRIC OSCILLATIONS 'according to ed. No. 838610, characterized in that, with the aim of improving accuracy and expanding functional capabilities. NOSTA converter has a second switch us introduce two upravlyav_ Mykh voltage divider and ¹ Vatel converted voltage to current, and Auto · swarm input of the first switch is connected to the output of the comparator and to the input of the first upravlyaemogo- ¹ To divisors whose output voltage ,: connected to the third input of the first switch and to the first input of the adder, the first input of the second switch is connected to the second input of the adder and to the output of the second controlled voltage divider, the input of which is connected to the second input of the second switch, to the output of the integrator and to the input of the voltage-to-current converter connected to the input of the transformer sensor and the third _; th input of the adder whose output is connected to the control input per- Vågå managed f, * of the voltage divider and to the input of a differentiator connected to the control input Auto-l cerned managed voltage divider and the outputs of both ^d: switches connected to the respective inputs of the comparator. - ς0 00 joint venture