RU2313818C1 - Device for stabilization and balancing of three-phased voltage - Google Patents

Abstract

FIELD: engineering of devices for stabilizing and balancing three-phased voltage.

SUBSTANCE: device for stabilization and balancing of three-phased voltage contains executive element made in form of two serially coupled reducing and increasing transformers with magnetization winding for each phase and control block, connected to output clamps, in which primary windings of each one of two transformers are made according to "zigzag" circuit and coupled serially to each other, where one free contact of these windings is connected to input or output, and second free contacts form zero output contact for connection of phase loads.

EFFECT: reduction of stabilized power of transformation equipment.

1 dwg

Description

The invention relates to electrical engineering and can be used in power circuits of various equipment.

Known three-phase AC voltage stabilizer containing a balancing transformer [1].

A device for stabilizing and balancing a three-phase voltage, containing a three-phase transformer-thyristor regulating body [2]. Disadvantage: low reliability due to the possibility of short-circuited circuits during switching and damage to thyristor switches.

Closest to the proposed is a three-phase AC voltage stabilizer containing a control unit and an actuator based on two transformers with magnetization windings and primary windings connected in series with each other, and a balancing transformer [3]. Disadvantage: large installed capacity of transformer equipment.

The purpose of the invention is the reduction of installed capacity of transformer equipment.

This goal is achieved in that the primary windings of each of the transformers are connected in a zigzag circuit and in series with each other, with one free output of these windings connected to the input or output, and the second free outputs form a zero output terminal for connecting phase loads.

Thus, the claimed device meets the criteria of the invention of "novelty."

Comparison of the claimed technical solution not only with the prototype, but also with other technical solutions in this technical field did not reveal signs that distinguish the claimed technical solution from the prototype, which allows us to conclude that the technical solution meets the criterion of "significant differences".

The drawing shows a diagram of the device.

A device for stabilizing and balancing a three-phase voltage contains an actuator 1, consisting of two series-connected transformers 2 and 3 and having power secondary windings 4 and 5, as well as primary windings 6, 7 and 8, 9, respectively. In this case, the transformer 2 is step-down, and the transformer 3 is step-up. In addition, the transformers have magnetization windings 10, 11 and 12, 13 connected in opposite-sequence with each other to compensate for the variables of E.D.S. The windings 6, 7 and windings 8, 9 are included in the zigzag in series with each other. To regulate the bias currents of the actuating element, a control unit 14 is used, connected with the output terminals. Zero output for connecting phase loads - 15.

The device operates as follows.

When deviating from a given voltage value at the output of the stabilizer, the control unit 14 provides a redistribution of the bias currents in the windings 10, 11 in the step-down transformer 2 and in the bias windings 12, 13 in the step-up transformer 3, so that when the output voltage decreases, the bias current in step-down transformer 2 and increase in step-up transformer 3. This allows you to get an increase in the overall transformation ratio. When the output voltage increases, the action of the circuit is the opposite.

Since the zero terminal for connecting phase loads is the neutral wire of the windings of the three-phase step-down transformer 2, which are included in the “zigzag” and of the primary windings of the step-up transformer 3 connected in series with it, the windings of which are also included in the “zigzag”, which ensures phase voltage balancing relative to the zero Conclusion 15. When stabilizing linear (phase) voltages, simultaneous stabilization of phase (linear) voltages and improving the shape of the phase voltage curve are ensured. With this inclusion of windings, the transformers have a large resistance for currents of forward and reverse sequence and small for currents of zero sequence.

The technical and economic efficiency of the proposed technical solution is to exclude the use of a separate balancing transformer and its function is provided by step-down and step-up transformers.

Information sources

1. Electrical reference book. Moscow, Moscow Power Engineering Institute, 1998, p. 135, Fig. 24.19.

2. Patent of the Russian Federation No. 2215320, M. Cl. G05F 1/30, 2000.

3. A.s. USSR No. 1310787, M. Cl. H02M 5/12, 1985.

Claims (1)

A device for stabilizing and balancing a three-phase voltage, containing an actuator made in the form of two series-connected step-down and step-up transformers with a magnetizing winding for each phase, and a control unit associated with output terminals, characterized in that, in order to reduce the installed capacity of the transformer equipment , the primary windings of each of the two transformers are made according to the zigzag circuit and are connected in series with each other, with one free output their windings connected to the input or output, a second free conclusions form the zero output terminal for connection phase loads.