Three-phase 24 pulse wave double-extended-triangle output winding phase-shifting rectifier transformer

Abstract

The invention provides a three-phase 24 pulse wave double-extended-triangle output winding phase-shifting rectifier transformer which comprises primary windings, secondary windings and a core. A connection mode of the primary windings adopts triangle, star, hexagon or extended-hexagon connection, and the primary windings are improved in that rated voltage of the primary windings is high voltage or low voltage. The secondary windings are two groups extended-triangle windings which are unequal in turns, symmetrical and mutually unconnected, the two groups of secondary windings are both wound by metal foil or conductors after insulation, and the rated voltage of each secondary winding is low voltage or high voltage. The primary winding and the secondary windings are in concentric or up-down arrangement on a core limb in each phase, and the core is a three-phase core in the shape of two stacked blocks or a triangle. The three-phase 24 pulse wave double-extended-triangle output winding phase-shifting rectifier transformer has the advantages of high efficiency, less material consumption, small size, low cost, low internal loss and the like.

Description

technical field [0001] The invention relates to a three-phase rectifier transformer, in particular to a three-phase 24-pulse double-extension triangle output winding phase-shifting rectifier transformer. Background technique [0002] At present, in order to suppress the interference of the high-order harmonic current generated by the rectification device to the power grid, the multi-pulse phase-shifting rectification technology is often used. The main principle is to connect the secondary winding of the three-phase rectifier transformer into n-way (n-phase) AC output terminals with a certain phase difference, and connect it to the n-phase rectifier bridge, so that the current waveform in the DC output circuit of the rectifier bridge has 2n A pulsation waveform (abbreviated as pulse number). The higher the number of pulses, the smaller the AC component in the DC circuit, and the lower the high-order harmonic current content in the AC circuit on the primary side of the rectif...

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Problems solved by technology

The larger the number of transformers or the number of output winding groups, the larger the volume, the more material consumption, and the higher the cost and internal loss of the rectifier device

Moreover, its 12-phase rectification circuit uses four three-phase rectifier bridges connected in parallel. In order to prevent the actual maximum output voltage of the transformer from being higher than the input voltage of the three-phase rectifier bridge, a balance reactor and other devices must be added to the circuit to complicate the circuit. , reduces reliability and increases cost

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