RU200820U1 - TRANSFORMER VOLTAGE REGULATOR - Google Patents

Abstract

The utility model relates to the field of electrical engineering and can be used to adjust the voltage of a power transformer. The technical result of the utility model is the contactless voltage regulation of the transformer. The voltage regulator of the transformer contains a three-phase power transformer, a three-phase power autotransformer, capacitors, inductors, a load and wattmeters. the primary winding of a three-phase power transformer is connected through a capacitor with zero potential, and phase A of the transformer is connected to zero potential through an inductor, the secondary winding of a three-phase power transformer is connected in parallel with the load and another three-phase capacitor, as well as three-phase inductance.

Description

The utility model relates to the field of electrical engineering and can be used to adjust the voltage of a power transformer.

Known three-phase transformer with voltage regulation under load, containing switching devices of the branches of the adjusting winding in phases with position sensors and their output circuits, circuits for phase control switching devices and control circuits "ABOVE", "BELOW", characterized in that the output circuits of position sensors are connected to the inputs of the I1 element, the output of the I1 element is connected to one of the inputs of the I2 element, the control circuits "ABOVE", "BELOW" are connected to the second input of the I2 element, the output of the I2 element is connected to the input of the NOT element and the control circuits of the switching devices in the "SIMULTANEOUSLY" mode ", and the output from the element is NOT connected to the control circuits of switching devices in the" PHASE "mode (patent for invention of the Russian Federation №2159477).

The known transformer is the closest to this utility model.

The disadvantage of this transformer is the mechanical way of switching the regulating terminals of the windings, which is the cause of arc formations and, as a consequence, failure of the contact system.

The technical result of the utility model is the contactless voltage regulation of the transformer.

The specified technical result is achieved by the fact that in a voltage regulator of a transformer containing a three-phase power transformer, a three-phase power autotransformer, capacitors, inductors, a load and wattmeters ACCORDING TO A USEFUL MODEL, the primary winding of a three-phase power transformer is connected in parallel to one three-phase capacitor, a three-phase power transformer and through a power autotransformer with a three-phase AC voltage source, phase C of the primary winding of a three-phase power transformer is connected through a capacitor with zero potential, and phase A of the transformer is connected to zero potential through an inductor, the secondary winding of a three-phase power transformer is connected in parallel with the load and another three-phase capacitor, as well as three-phase inductance ...

FIG. 1 is a schematic diagram of a transformer voltage regulator;

FIG. 2 shows a vector diagram of the EMF, voltages and currents of the transformer voltage regulator;

FIG. 3 shows a vector diagram of a transformer with an active - inductive load;

FIG. 4 shows a vector diagram of a transformer with an active - capacitive load.

The transformer voltage regulator contains a three-phase power transformer 1 (Fig. 1), a three-phase power autotransformer 2, capacitors 3-5, inductors 6, 7, load 8 and wattmeters 9, 10, and the primary winding of the three-phase power transformer 1 is connected in parallel to one three-phase capacitor 3, a three-phase power autotransformer 2 and through wattmeters 9, 10 with a three-phase AC voltage source, phase C of the primary winding of a three-phase power transformer is connected through a capacitor 4 with zero potential, and phase A of the transformer is connected to zero potential through an inductor 6, the secondary winding of a three-phase power transformer transformer is connected in parallel with load 8 and another three-phase capacitor 5, as well as three-phase inductance 7.

The transformer voltage regulator works as follows. As shown in the vector diagrams of the transformer, FIG. 3 and FIG. 4, depending on the nature of the load of the transformer, the voltage value of the secondary winding changes. With an active-inductive load (Fig. 3), the voltage decreases, and with an active-capacitive load, it increases. Therefore, at increased voltage, to reduce it, three-phase inductance 7 is turned on, and at low voltage, to raise it, three-phase capacitance 5 is turned on. Power autotransformer 2 creates a zero potential to connect single-phase capacitor 4 and inductance coil 6. These elements create currents in antiphase to line voltages and load currents at the input and adding up to the latter, reduce the resulting values of the total currents in phases A and C. Three-phase capacitor bank 3 compensates for reactive power of an inductive nature at the input.

Claims (1)

A transformer voltage regulator containing a three-phase power transformer, a three-phase power autotransformer, capacitors, inductors, a load and wattmeters, characterized in that the primary winding of a three-phase power transformer is connected in parallel to one three-phase capacitor, a three-phase power autotransformer and through wattmeters with a three-phase AC voltage From the primary winding of a three-phase power transformer it is connected through a capacitor with zero potential, and phase A of the transformer is connected to zero potential through an inductance coil, the secondary winding of a three-phase power transformer is connected in parallel to the load and another three-phase capacitor, as well as three-phase inductance.

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