SU1709250A1 - Transformation ratio and transformer windings serviceability tester - Google Patents

Abstract

The invention relates to an instrumentation technique and can be used for the operational control of the transformation ratio and the operability of the transformer windings. The purpose of the invention is to simplify the device and, consequently, increase reliability. The device contains an alternating voltage generator 6 (pulsed or sinusoidal), terminals 1 and 2 for connecting the first winding of the monitored transformer 3, terminals 4 and 5 for connecting the second winding of the monitored transformer 3, resistors 7 and 8 connected in series between terminals 1 and 5. The common point of these resistors is connected to the corresponding input of the voltage comparison unit 9, the output of which is the information input of the device. One of the outputs of the generator 6 is connected to terminal 1, and the other to the common output, to which terminals 2 and 4 are also connected. If there is no defect in the transformer windings and the transformer transformer ratio corresponds to the output of block 9, there is no signal. The appearance of a signal at the output of block 9 indicates the presence of a defect in the transformer winding or the transformation ratio does not match the specified one. 1 Z.P. F'LY, 1 Il. G < * ^ N • t! VIoCh) ate o • "- * > & -5 •"

Description

The invention relates to measuring technique and can be used for the operational control of the transformation ratio and the health of the transformer windings. 5

The purpose of the invention is to simplify the device and, accordingly, increase reliability. - +. + /

The drawing shows a diagram of the proposed device. 10

The device contains the first 1 and second 2 terminals for connecting the first winding of the controlled transformer 3, the second 4 and fourth 5 terminals for connecting the second winding of the controlled 15 transformer 3, alternating voltage generator 6 (pulse or sinusoidal), the first 7 and second 8 resistors and block 9 voltage comparison, and the first output of the generator 5 is connected to a common 20 output, and the second ~ to the first terminal 1. The second 2 and third 4 terminals are connected to a common output. The first output of the first resistor 7 is connected to the first terminal 1, a. the second terminal is with the input of block 9 and with the first 25 terminal of the second resistor 8, the second terminal of which is connected to the fourth terminal 5. The output of block 9 is the information output of the device.

In addition, to obtain a more complete 30 information on the nature of the defect, a two-threshold comparator modulo can be used as block 9.

Block 9 also includes a reference voltage source (not shown). 35

The device operates as follows. Preliminarily, using the reference transformer similar to the controlled one, the corresponding resistance values of the resistors 7 and 8, representing 40 resistive divider, are selected. For example, when monitoring a transformer with a transformation coefficient equal to 2, the division ratio of the divider is set to 1 / (1 + 2). Connect the findings 45 of the first and second windings of the transformer 3 to the corresponding terminals. When a corresponding voltage is supplied from the generator 6 to the first winding in the absence of a defect in the transformer winding and 50 when the transformation coefficient is set to the output of the block 9, a signal close to zero is observed at each moment of time, since the voltages at the first and second windings of the transformer 3 are in antiphase . Accordingly, there is no 5 signal at the output of the device:

In the presence of a defect in the winding of the transformer 3 (for example, due to an open or short circuit) or a mismatch 10 of the transformation coefficient specified at the output of block 9, a signal corresponding to the presence of Defects appears.

When using a comparator of voltages modulo 9 at the output of the device with a faulty transformer 3, a constant voltage is present, and in the absence of a defect, a continuous sequence of rectangular pulses.

The invention provides a simplification of the device compared to the known device, resulting in increased reliability.

Claims (2)

Claim 25 1. A device for monitoring the transformation coefficient and operability of transformer windings, comprising a voltage generator, the first terminal of which is connected to a common terminal, the first and second 30 terminals for connecting the first winding of the controlled transformer, the third and fourth terminals for connecting the second winding of the controlled transformer, the second and the third indicated terminal 35 is connected to a common terminal, a first resistor, the first terminal of which is connected to the first specified terminal, a second resistor. It is noteworthy that, in order to simplify the device, a voltage comparison unit is introduced, the second output of the voltage generator connected to the first indicated terminal, the second output of the first resistor connected to the input of the voltage comparison unit and to the first output of the second45 th resistor, the second output of which is connected to the fourth indicated terminal, the output of the voltage comparison unit is the information output of the device. 2. The device according to p, 1, about t and h and ya and y with with i 50 topics. that a two-threshold comparator modulo is used as a voltage comparison unit.