Single-phase and three-phase integrated excitation transformers

Abstract

The invention relates to a single-phase and three-phase integrated excitation transformer, which includes three single-phase excitation transformers and four sets of contactors with three output terminals; each set of contactors includes three synchronous contactors; the first set of contactors The contactor is connected between the first end of the output winding of the three single-phase excitation transformers and the three output ends, and the second set of contactors is connected between the second end and the third output end of the output windings of the three single-phase excitation transformers Between, the third group of contactors are interleavedly connected between the first end and the second end of the output windings of the three single-phase excitation transformers, and the fourth group of contactors are connected between the first and second ends of the output windings of the three single-phase excitation transformers. terminal and the first output terminal. The invention can simultaneously meet the requirements of single-phase or three-phase series resonance partial discharge test and has less wiring workload during use.

Description

technical field [0001] The invention belongs to the technical field of high-voltage testing, and in particular relates to a single-phase and three-phase integrated excitation transformer. Background technique [0002] The excitation transformer plays the role of initially increasing the input power supply voltage in the series resonance high-voltage test, and its capacity needs to be greater than the entire test capacity. When the original three-phase power transformer is used for the partial discharge test, it can be carried out in phases, that is, each phase is separately tested. Partial discharge test. At present, the partial discharge test of three-phase power transformers requires three phases to be carried out at the same time, so it is necessary to design an excitation transformer that can meet both three-phase and single-phase applications. [0003] In addition, due to the problem of heat dissipation, the linear variable frequency power supply currently available on...

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Problems solved by technology

[0003] In addition, due to the problem of heat dissipation, the linear variable frequency power supply currently available on the market can only achieve a maximum power of about 500kW. For large-capacity three-phase tests, the test capacity can reach 1.2MW, and three single-phase linear power supplies are required. Frequency conversion sources are combined into three-phase use, this requirement also requires the transformation of single-phase excitation transformer to meet the requirements of three-phase test

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