Oil-immersed 54 pulse wave frequency conversion transformer for large-power high-voltage frequency conversion apparatus

Abstract

The invention relates to an oil-immersed 54 pulse wave frequency conversion transformer for a large-power high-voltage frequency conversion apparatus. High voltage employs three-phase input windings connected by use of a Y-shaped connection method, low voltage employs polyphase output windings connected by use of an extended triangular connection method, the low-voltage windings are divided into three large groups, and each large group comprises nine phase shift windings with phase shift angles respectively being +26.67 degrees, +20 degrees, +13.33 degrees, +6.67 degrees, 0 degree, -6.67 degrees, -13.33 degrees, -20 degrees and -26.67 degrees, the angle difference of each phase shift winding being 6.67 degrees; each phase is formed by connecting a plurality of power units in series; the high-voltage windings are also divided into three large groups, and the high-voltage windings and the low-voltage windings both employ crossover coil structures; and there are all together 81 windings at three phases of a secondary side, wires of low-voltage sleeves go out from the side wall of a fuel tank. According to the invention, a multiple-rectification technical design is employed, 54 pulse wave rectification of a single transformer is realized, input current harmonic waves of a system are substantially reduced, the radix of input currents is increased, and accordingly, the purpose of improving the input power factor of the system is improved; and the structure is reasonable, the manufacturing process is simple, the anti-short-circuit capability is high, the economic index is good, and the insulation reliability is good.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to an oil-immersed 54-pulse frequency conversion transformer for high-power high-voltage frequency conversion devices. Background technique [0002] An important technology in high-voltage frequency conversion speed regulation technology is multiple rectification technology. It uses isolation transformers to superimpose (series) multiple low-voltage modules to form high-voltage output. It is mainly composed of multiple power units and control units. Each power The unit is powered by a three-phase winding of a multi-winding isolation transformer. There is a phase difference between the secondary coils of this multi-winding isolation transformer, which realizes multiple inputs and eliminates the pollution of the harmonics generated by each unit to the power grid. , the isolation transformer is an indispensable and important component in the high-voltage frequency converter, and i...

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Problems solved by technology

Theoretically, the higher the number of pulses, the smaller the rectified voltage ripple and the smaller the harmonics, but the more phase-shifting units of the transformer, the more segments the winding needs to be segmented, the larger the space occupied, and the more complicated it is, so the difficulty of design and manufacture also higher

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