Dual input auto-coupling 18-pulse rectifier transformer

Abstract

The invention discloses a double-circuit input self-coupling 18-pulse rectifier transformer. The double-circuit input self-coupling 18-pulse rectifier transformer is characterized in that three main winding coils of the double-circuit input self-coupling 18-pulse rectifier transformer are in delta connection with one another, and three connection points are a first group of input taps; a second group of input taps and a first group of output taps are respectively arranged on the three main winding coils; taps which are connected with a first phase shift winding coil and a second phase shift winding coil are arranged on the first main winding coil, taps which are connected with a third phase shift winding coil and a fourth phase shift winding coil are arranged on the second main winding coil, and taps which are connected with a fifth phase shift winding coil and a sixth phase shift winding coil are arranged on the third main winding coil; the first phase shift winding coil and the sixth phase shift winding coil are wound on a second core column, the second phase shift winding coil and the third phase shift winding coil are wound on a third core column, and the fourth phase shift winding coil and the fifth phase shift winding coil are wound on a first core column; the six phase shift winding coils have identical numbers of turns, and a second group of output taps and a third group of output taps are formed by output ends of the six phase shift winding coils; the locations of the taps which are connected with the phase shift winding coils are determined according to constant 20-degree phase shift angles.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to a dual-input self-coupling 18-pulse rectifier transformer. Background technique [0002] The multi-pulse rectification technology uses phase-shifting transformers to obtain voltage vectors with different phases. Different voltage vectors are passed through the rectifier bridge to obtain multiple sets of peak voltages and superimposed to form DC. The more voltage vectors with different phases, the better the output DC performance. As the rectifier transformer, the core device of multi-pulse rectification technology, the current research on multi-pulse rectifiers mainly focuses on three aspects: the method of reducing the THD value of the grid-side current, the adjustment method of the output DC voltage range, and how to reduce the rectifier voltage. volume and weight. In the ordinary auto-coupling 18-pulse rectifier transformer, the output voltages of the three g...

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Problems solved by technology

[0003] The purpose of the present invention is to propose a dual-input self-coupling 18-pulse rectifier transformer, which can realize random switching between two different input voltages while ensuring that the output voltage remains unchanged, and solve the problem of ordinary auto-coupling 18-pulse rectification. The unbalanced power distribution of the rectifier bridge after the transformer reduces the cost of the user in the selection of rectifier tubes

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