Transformer changing from three phases to single phase

Abstract

The invention discloses a transformer changing from three phases to single phase, aiming at solving the problems that three-phase balance of a power supply system is affected and the user operationalcost is increased when a flash butt welder is applied in the prior art. In the transformer changing from three phases to single phase, an external terminal comprises three power input ends and two power output ends; the internal structure comprises a first single-phase transformer and a second single-phase transformer, wherein a terminal of a primary winding of the first single-phase transformer is connected with a first phase power input end and the other terminal is connected with a midpoint of a primary winding of the second single-phase transformer; two terminals of a primary winding of the second single-phase transformer are respectively connected with a second phase power input end and a third phase power input end; a secondary winding of the first single-phase transformer and a secondary winding of the second single-phase transformer are connected in series between two power output ends; and the second single-phase transformer adopts a connection manner for enhancing the self-coupling degree of a second phase winding and a third phase winding.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a three-phase-to-single-phase transformer. Background technique [0002] The current high-power flash butt welding machine power supply is provided by a three-phase to three-phase common power transformer. [0003] In the process of realizing the present invention, the inventor found at least the following problems in the prior art: due to the high single-phase power of the welding machine, the three-phase transformer operates in single-phase mode during welding, resulting in a serious three-phase imbalance in the regional power supply system. At the same time, it also increases the operating cost of the user, that is, the capacity of the three-phase ordinary power transformer is increased by 1.5 times, and the basic electricity fee is also increased by 1.5 times. Contents of the invention [0004] The invention provides a three-phase-to-single-phase transformer, which wi...

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Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: because the single-phase power of the welding machine is relatively large, the three-phase transformer operates in a single-phase mode during welding, resulting in a serious unbalance of the three phases of the regional power supply system

At the same time, it also increases the operating cost of the user, that is, the capacity of the three-phase ordinary power transformer is increased by 1.5 times, and the basic electricity fee is also increased by 1.5 times

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