Balancing three-phased to one-phased voltage transformer

FIELD: electric engineering, possible use for powering various equipment.

SUBSTANCE: the balancing three-phased to one-phased transformer of alternating voltage contains input and output contacts, to which a transformer is connected which has primary windings in all three phases and two secondary windings in phases A and C. Primary windings are connected in a "zigzag". Windings of phases A and B, B and C, and also C and A are connected respectively. Secondary windings in phases A and C are coupled oppositely and are connected to output contacts.

EFFECT: reduction of stabilized power and asymmetry of primary currents and voltages.

1 dwg

 

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

Known symmetrise device, feeding a single-phase load, containing a three-phase transformer system rectifier-inverter [1]. Disadvantage: large difficulty.

It is known device for balancing a three-phase network when powered single-phase load, containing a three-phase transformer [2]. The drawback is the difficulty caused by the presence of three windings on the output, and a considerable asymmetry of the primary currents.

Closest to the present invention is a three-phase transformer AC voltage containing the input and output terminals which are connected to the transformer primary winding in all three phases and two secondary phases a and C. the Disadvantage: large installed power transformer equipment and significant asymmetry of the primary currents and phase voltages [3].

The purpose of the invention is the reduction of installed power transformer equipment and reduction of the asymmetry coefficient of the primary currents and phase voltages.

This objective is achieved in that the primary winding of three-phase transformers are connected according to the scheme zigzag, and are connected to the windings of phases a and B, b and C, C and A, and the secondary windings of phases a and C are included meetings of the but and is connected to the output terminals.

Thus the proposed device complies with the criteria of the invention of "novelty."

Comparison of the proposed technical solution is not only the prototype, but also with other technical solutions in this field of technology not found in them the features distinguishing the claimed technical solution to the prototype that allows to make a conclusion about the technical solutions according to the criterion of "significant differences"

Figure 1 shows a diagram of the device.

Balancing three-phase-single-phase transformer AC voltage contains the input terminals A1, B1, C1 and output terminals A2 and C2, three-phase-single-phase transformer 1 having a primary winding connected in the circuit zigzag, 2 and 3, and are connected to the winding 2 phase a winding 3 phase, winding 2 phase winding 3 phase and winding 2 phase winding 3 phase A. Secondary winding phases a and C connected in opposite and connected to the terminals A2 and C2.

2 shows the scheme of balancing three-phase-single-phase transformer when working in autotransformer mode.

Balancing three-phase-single-phase transformer works as follows. When the supply from the mains or from an independent source, such as a diesel generator three-phase AC voltage, is included in "zigzag" of the primary winding 2, 3, output phase voltage is removed from VK is uchenykh counter windings of phases a and C. The magnitude of this voltage is determined by the transformation ratio of the transformer 1. Due to this inclusion of the primary windings 2 and 3, when the counter in the "zigzag" included windings 2 and 3 phases a and b, and C and C and a, And the output voltage is removed from phases a and C, the asymmetry of the primary currents and voltages are minimal.

Technical and economic efficiency of the proposed solution lies in the fact that from the three-phase supply network or from a stand-alone three-phase source voltage, for example, a diesel generator when the unbalance of the input rumors up to 20% can be obtained at the output of the single-phase power up to 80% of the power supply network (stand-alone diesel generator).

Sources of information

1. A. C. the USSR № 1372473, M, CL, H02J 3/26 NM 5/32 1985.

2. Gnero. The electric machine. Part 1, "Energy", Moscow, 1974, str, 2-152.

3. Gnero Electric machine. Part 1, "Energy", Moscow, 1974, str, 2-157.

Balancing three-phase-single-phase transformer AC voltage containing the input and output terminals are connected to a transformer having a primary winding in all three phases and two secondary windings in phases a and C, characterized in that, in order to reduce the installed capacity and reduce the asymmetry coefficient of the primary currents and phase voltages, the primary winding connected in Xe is zag, and connected to the windings of phases a and b, b and C, C and A, and the secondary winding in phases a and C are included counter and is connected to the output terminals.



 

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