SU1372246A1 - Device for checking transformer parameters - Google Patents

Abstract

The invention relates to the field of electrical measurements and allows an increase in labor productivity. The device contains a phase shifter 1, a signal source 3 and indicators 7 and 9 of current and voltage. Introduction of the polarity matching unit 2, voltage regulators 4-6, type of operation switch 8, switch 10 and load 13 allows only one installation of the object to be tested to the contact pad 12. In addition, the control operations are combined, which improves the speed of the device . 1 il.

Description

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The invention relates to the field of electrical measurements and, in particular, uses phase relationships between signals to implement a device for monitoring parameters of low-power transformers.

The purpose of the invention is povygaen productivity.

The drawing shows a structural block diagram of the device.,

The device contains a phase shifter 1, polarization unit 2, signal source 3, first 4, second 5 and third 6 voltage regulators, current indicator 7, work type switch 8, voltage indicator 9, switch 10, transformer under test 11, contact pad 12, load 13.

In this case, the outputs of the signal source 3 are combined with the inputs of the first 4 and second 5 voltage regulators, the outputs of the first controller A by the first and second outputs of the test transformer 11. The third and fourth normally open contacts of the type of switch 8 are respectively connected to the inputs of the third controller 6 voltages and the corresponding inputs of the switch 10, to the outputs of which are connected respectively

Q indicator 9 voltage and load 13.

The polarity matching unit 2 contains two branches, each of which consists of series-connected resistors, a thyristor, and a signal

15 lamp, the second terminal of which is connected to the common wire. The first branch is connected to the first input of the unit 2, the second input of which is connected to the common wire and the fourth input of the same

20 of the polarity matching unit 2, the fifth input of which is combined with the thyristor control inputs. An additional circuit is connected to the thyristor anode of the second branch, consisting of the latter connected to the corresponding inductance-connected diode, the first and second outputs of the test transformer 11. The third and fourth normally open contacts of the switch 8 of the type of operation are respectively connected to the inputs of the third controller 6 for example and the corresponding inputs of the switch 10, to the outputs of which are connected respectively

voltage indicator 9 and load 13.

The polarity matching unit 2 contains two branches, each of which consists of series-connected resistors, a thyristor, and a signal

lamp, the second terminal of which is connected to the common wire. The first branch is connected to the first input of the unit 2, the second input of which is connected to the common wire and the fourth input of the same

polarity matching unit 2, the fifth input of which is combined with thyristor control inputs. An additional circuit is connected to the thyristor anode of the second branch;

With a phase shifter 1, the first output of which is connected to the corresponding input of the polarity matching unit 2, the second output of the phase shifter 1 is connected to the second input of the polarity matching unit 2, the third input of which is connected to the analogous output of the phase shifter 1. The fourth input of the 2nd unit is connected to the first output, and the fifth input of the unit 2 is connected to the second output of the third voltage regulator 6. The outputs of the second voltage regulator 5 are connected respectively to the first and second group of contacts of the switch 8 of the type of operation. The first normally closed contact of the switch 8 kind of work is connected through the indicator 7 current with the first input of the test transformer 11, the inputs

which are combined with the corresponding 45 terminals serves (setting the required terminals of the pad 12-. Parameters are made using a normally open normally open switch contact. During work, it is connected to the first input of the tested transformer 11, the second input of which is connected to the second normally closed and normally open the contacts of the switch of the 8 kind of work. The first and second changeover contacts of the switches 4-6. voltage) on the primary winding of the transformer under test 11.

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At the same time, the test voltage through the voltage regulator 4 and the non-inverting output, the phase shifter 1 (with phase retention) enters the work type body 8 connected to the corresponding polarity gg on the polarity matching unit 2 of the second control output of the instantaneous test values.

voltage and voltage of the secondary winding of the transformer under test

torus 5 voltage, the third and fourth changeover contacts of the same switch 8 are connected respectively to

11, and through the inverting output of phase 0

five

0

The relay, the second input of which is connected to the common wire, and the relay contacts form a switch that connects a voltage indicator 9 to the output of the test transformer 11.

The device works as follows.

In the initial position of the work type switch 8, the no-load current of the test transformer 11 is monitored using the current indicator 7 for this. In the second position of the switch 8, the voltage of the secondary winding of the test transformer 1 1 is measured, and at the same time, the phase winding of its windings.

For this, the test voltage from source 3 of signal through

tori 4-6. voltages) on the primary winding of the transformer under test 11.

11, and through the inverting output of the phase shifter 1, the test voltage in the form of an auxiliary voltage enters the second circuit of the polarity matching unit 2.

Due to the fact that the first and second thyristor electrode supplies voltage to the secondary winding of the transformer, in the case of coherent winding of the primary and secondary windings of the transformer, the first thyristor opens (its two-phase input voltage is applied), which causes the first to ignite signal lamp, while the second thyristor remains in the closed state, since antiphase voltages are applied to its two inputs. This auxiliary AC voltage is converted to a constant voltage, which is then used to control the switching of the electromagnetic relay. In turn, the closing contacts of the switch 10 are connected to the secondary winding of the transformer under test a load 13 together with a voltage indicator 9, which serves to determine the voltage value of the secondary winding of the transformer (transformation ratio).

Thus, the voltage indicator 9 is connected to the tested winding only when the windings are consonant.

As a result of this indicator 9, indications simultaneously indicate both the magnitude of the secondary winding voltage (transformation ratio) and the phase windings. Additional evidence of the correctness of the winding produced is also the burning of the signal first lamp.

At the same time, if the winding is incorrectly executed (i.e., the winding is counter-opposed), then the first thyristor remains in a non-conducting position, and the second thyristor is opened, since the compared voltages are supplied to the input electrodes of the second thyristor same polarity. As a result of the opening of the second thyristor, the second signal lamp lights up, indicating the opposite type of winding (or the wrong pinout of the transformer 11). Since in this case the voltage at the anode of the second thyristor is below the threshold of the zener diode, the current does not pass through it, and the performer 5 0 5

0

five

0

Q g

The electromagnetic relay does not work, as a result of which the voltage indicator 9 is not connected to the tested winding.

Thus, in each of the cases considered, either the first thyristor or the second thyristor compares the polarities of the instantaneous values of the secondary winding of the tested transformer 11 with the fields of the instantaneous values of either test or auxiliary voltage respectively.

Consequently, by the indications of voltage indicator 9, it is possible to simultaneously judge both the magnitude of the transformation ratio of the product being monitored and the phase shift (it is equal to O in this case) between the test voltage supplied to the transformer primary winding and the voltage taken from it secondary winding.

The latter also allows to make a conclusion about the type of winding of the windings of the induction element (or the correct wiring of its leads), which is necessary and necessary for some types of transformers.

A test of the no-load current of a transformer is performed by a known method.

The use of the proposed device in comparison with the known one reduces the laboriousness of the control operation, since only one installation of the inspected object is performed in the contact area (this is especially important in cases where the winding product has flexible pipes and has to be fed to the control device), reducing random operator errors by combining Control Operations, increasing speed by increasing the number of simultaneously checked parameters, increasing the convenience of visual It is necessary to determine the parameters, since one measurement is taken. In addition, the entire process is simplified. This automates the measurement process.

Claims (1)

Invention Formula Device for controlling the parameters of transformers containing the source signal, current indicator, voltage indicator and phase shifter, characterized in that, in order to increase labor productivity, the first, second and third voltage regulators, type of work switch, contact platform for connecting the tested transformer, switch, load, a polarity matching unit, while the outputs of the signal source are connected respectively to the inputs of the first and second voltage regulators, the outputs of which are respectively connected to the first and second changeover contacts yuchatel kind of work, the first normal eamknuty contact through which current indicator connected to the first terminal landing pad and the first normally open contact switch genus Started You, the second normally closed and second normally open contacts of the same switch are connected and connected to the second terminal of the contact pad, the third and fourth terminals of which are connected to the inputs of the third controller through the corresponding toggle contacts and normally open contacts of the third controller, voltage and the switch, the outputs of the first voltage regulator are connected respectively to the inputs of the phase shifter, the first, second and third outputs of which are connected to the same inputs of the mapping unit neither the polarity, the outputs of the third voltage regulator, respectively, are connected to the fourth and fifth inputs of the polarity matching unit, and the switch outputs are connected to the load and the voltage indicator connected in parallel.