Dual extended delta progressive-reduction voltage regulating rectifier transformer

Abstract

The invention relates to a rectifier transformer, in particular to a double-extension triangular step-down voltage-regulating rectifier transformer. It includes the basic winding of the main transformer in the main transformer, the phase-shifting winding of the main transformer, the primary winding of the modulation in the voltage regulating transformer, the secondary coarse winding of the modulation, the fine winding of the secondary modulation, and the multi-level coarse and fine adjustment with load points. The switch is connected, and the secondary coarse-tuning winding of the modulation includes 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 connected in series, and the 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 delta connection to form a double-extended triangle connection The insulation level of the line, the secondary windings of the modulation and the primary winding of the main transformer to the ground is low; the insulation level of the switch is low, and the cost is low; the overall loss of the rectifier transformer is small, energy-saving and environmentally friendly, and the output voltage needs to be adjusted in a wide range of levels.

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 ...

AI Technical Summary

Problems solved by technology

This connection method lowers the insulation level of the voltage regulating winding and the primary winding of the main transformer to the ground, and the insulation level of the switch is high. The manufacturing is cumbersome, the loss is large, and the cost is high.

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