Novel on-load-tap-changing combined rectifier auto-transformer with independent ends

Abstract

A novel on-load-tap-changing combined rectifier auto-transformer with independent ends comprises a regulating transformer and two rectifier transformers. Phases of the regulating transformer are the same in structure. The regulating transformer comprises a high-tension coil, a front-end auto-regulating winding, a tail-end auto-regulating winding, a front-end on-load tap changer and a tail-end on-load tap changer. The front-end auto-regulating winding and the rear-end auto-regulating winding are combined ad connected to the front end of the high-tension coil of the regulating transformer and are connected with the same in parallel. The front-end and rear-end auto-regulating windings supply variable voltage to high-tension coils of the rectifier transformers through tap changing so as to achieve rough voltage regulating. The tail-end auto-regulating winding and the tail-end on-load tap changer are combined and connected to the tail ends of the high-tension coils of the rectifier transformers so as to achieve fine voltage regulating. The rough tap changer and the fine tap changer are fully isolated, regulating range is wide, regulating is multilevel, output of low voltage is smooth, operating performance is stable, harmonic wave generated by rectification can be reduced, power factor and production efficiency of rectifier systems are increased, and manufacturing cost is lowered.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a new type of novel combined rectifier transformer with independent on-load self-coupling and voltage regulation at the first and last ends. Background technique [0002] At present, the self-coupling voltage regulating rectifier transformer usually adopts the following methods: 1. Put the voltage regulating switch at the end of the self-coupling wiring for voltage regulation; 2. Put the voltage regulating switch at the first end of the self-coupling wiring for voltage regulation. The common problems of both solutions are: [0003] 1. The voltage regulating switch is used for coarse adjustment, and the voltage difference of each stage of the low-voltage output of the rectifier transformer is relatively large. When the output voltage is required to be fine-tuned, the voltage regulating switch of the transformer cannot meet the requirements, and can only be controlled by a saturated re...

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Problems solved by technology

[0003] 1. The voltage regulating switch is used for coarse adjustment, and the voltage difference of each stage of the low-voltage output of the rectifier transformer is relatively large. When the output voltage is required to be fine-tuned, the voltage regulating switch of the transformer cannot meet the requirements, and can only be controlled by a saturated reactor or by adjusting the thyristor of the rectifier cabinet. angle to fine-tune the output;

[0004] 2. When using a saturable reactor to adjust the output voltage, there are many operation failures of the saturated reactor, and the manufacturing cost is also high; when using a thyristor to adjust the output voltage, the increase of the control angle causes the power factor of the entire rectification system to drop

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