Double-extended-triangle descending voltage regulation rectifier transformer

Abstract

The invention relates to a rectifier transformer, and particularly to a double-extended-triangle descending voltage regulation rectifier transformer. The double-extended-triangle descending voltage regulation rectifier transformer comprises a main transformer basic winding and a main transformer phase-shifting winding in a main transformer, a voltage regulation transformer primary winding, a voltage regulation transformer secondary coarse tuning winding and a voltage regulation transformer secondary fine tuning winding in a voltage regulation transformer, and a multi-level coarse and fine tuning on-load tap-changer, wherein the voltage regulation transformer secondary coarse tuning winding comprises a first coarse tuning winding, a second coarse tuning winding, a third coarse tuning winding, a fourth coarse tuning winding and a fifth coarse tuning winding, all of which are connected in series; one or more of the first coarse tuning winding, the second coarse tuning winding, the third coarse tuning winding, the fourth coarse tuning winding and the fifth coarse tuning winding are connected to form a corner joint connecting line so as to a double-extended-triangle connection circuit; each secondary winding of the voltage regulation transformer and the primary winding of the main transformer have low insulation level for the ground; a switch insulation level is low, and the cost is low; the rectifier transformer is low in total loss and environmental friendly, and realizes large-range rank difference voltage regulation requirements on output voltage.

Description

technical field

[0001] The invention relates to a rectifier transformer, in particular to a double-extension triangular step-down voltage-regulating rectifier transformer. Background technique

[0002] Rectifier transformers include rectifier transformers for electrolysis, rectifier transformers for electric furnaces, and electric furnace transformers for silicon carbide in terms of applications. The salient features of the rectifier transformer structure are multi-pulse power supply and large-scale voltage regulation. In order to meet the load's requirements for DC voltage flatness and the AC grid side's requirements for harmonic current, etc., the rectifier device should use a multi-phase power supply and a circuit that conducts each phase in turn. To realize large-scale voltage regulation, a voltage regulating transformer with a certain voltage regulation method must be added before the rectifier transformer (ie, the main transformer).

[0003] The traditional pressure...

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