A transformer used for output of high-voltage and high-power converters

Abstract

The invention relates to a transformer for an output of a high-voltage high-power converter. The transformer comprises an iron core, a high-voltage coil, a low-voltage coil and insulating structures, wherein the high-voltage coil and the low-voltage coil are respectively wound on core limbs of the iron core; the insulating structures are respectively arranged among the iron core, the high-voltage coil and the low-voltage coil; the high-voltage coil is of a two-limb parallel structure and is also of a multilayer cascade structure; the low-voltage coil is divided into a plurality of parts; the parts of the low-voltage coil are connected in series in a crossed mode; each part of the low-voltage coil is of a single-layer cascade structure; the parts of the low-voltage coil are uniformly distributed on a plurality of core limbs; an air path with the length of 15 to 25mm is arranged in the middle of a primary part of the iron core; combined transposed conductors are used as lead wires of the high-voltage coil and the low-voltage coil; the turn insulation of the high-voltage coil and the low-voltage coil is respectively of a non-woven fabric and polyimide paint film dual-insulation structure; and resin is poured on the the non-woven fabrics. Due to the adoption of the parts of the transformer, the electrical endurance, the insulation life and the structural life of the transformer are ensured under the operation conditions of operation modes of pulse width modulation waveform switched into a primary side of the transformer, the impact voltage variation du / dt of not lower than 6,000V / mus, the voltage variation (0 to 20kV) and the frequency variation (0 to 300Hz) and the like.

Description

technical field [0001] The invention relates to an output transformer technology, in particular to a transformer used for the output of a high-voltage high-power converter and a detection method for its impact resistance strength. Background technique [0002] At present, the transformers in the prior art usually operate under the condition of rated voltage level, rated frequency (50 Hz) and sine wave, and the transformers in the prior art are not suitable for the transformer connected to the output terminal of the converter. In particular, it cannot meet the requirements for output transformers of high-speed maglev traffic with several MVAs to tens of MVAs of high-power traction converters. [0003] As a transformer connected to the output terminal of the converter, the design and manufacture of the transformer in the prior art cannot satisfy the pulse width modulation waveform connected to the primary side of the transformer, the change of impulse voltage du / dt not less th...

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Problems solved by technology

[0002] At present, transformers in the prior art usually operate under rated voltage level, rated frequency (50Hz), and sine wave conditions, and transformers in the prior art are not suitable for connecting to Transformer at the output of the converter

In particular, it cannot meet the requirements of output transformers for high-speed maglev traffic with several MVAs to dozens of MVAs and high-power traction converters

[0003] As a transformer connected to the output terminal of the converter, the design and manufacture of the transformer in the prior art cannot satisfy the pulse width modulation waveform connected to the primary side of the transformer, the change of impulse voltage du / dt not less than 6000 V / μs, and the change of high-voltage side voltage (0~20kV), frequency change (0~300Hz) operation mode and other requirements

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