Phase-shifting winding type voltage-regulating rectifier transformer and voltage regulating method thereof

Abstract

The invention belongs to the technical field of transformers and discloses a phase-shifting winding type voltage-regulating rectifier transformer and a voltage regulating method thereof. A transformer cabinet internally comprises a phase-A core limb, a phase-B core limb and a phase-C core limb which are wound by two groups of phase-A windings, phase-B windings and phase-C windings respectively. A long-side dotted terminal of a high-voltage-side base winding in each group of three-phase windings is serially connected with a short-side dotted terminal of an adjacent-phase phase-shifting winding, and a shunting tap of a high-voltage-side long-side terminal is serially connected with an opposite adjacent-phase short-side terminal via a tap switch, so that a closed phase-shifting loop is formed; shunting taps at the terminals of the windings are serially connected via tap switches to achieve switching voltage regulation; the low-voltage-side windings in star connection and in angular connection output multi-pulse electric energy definite in phase-shifting angle and regulatable in voltage to a rectifier. The phase-shifting winding type voltage-regulating rectifier transformer and the voltage regulating method thereof have the advantages that phase-shifting angles are definite, voltage regulating range and the number of winding tapping turns are matched well, and the voltage-regulating rectifier transformer is compact in structure and good in manufacturability, so that manufacturing cost and operating loss of the transformer are reduced.

Description

technical field [0001] The invention belongs to the technical field of transformers, and relates to a rectifier transformer, in particular to a rectifier transformer high-voltage side phase-shift voltage regulation technology. Background technique [0002] DC power supply systems are widely used in high energy consumption and electrochemical industries. In order to suppress harmonic pollution and improve the power factor, the larger the capacity of the rectifier transformer, the more pulses are required. In order to obtain more pulses, two or more 12-way output transformers are generally used to combine them, and the transformers are phase-shifted. Stagger the phase angles of the electrical signals output by two or more transformers. There are two problems here: the coordination of phase shifting and voltage regulation and the combination of multiple bodies. There are many methods for transformer phase shifting, but it is not easy to realize it when combined with voltage r...

AI Technical Summary

Problems solved by technology

There are two problems here: the coordination of phase shifting and voltage regulation and the combination of multiple bodies

Only changing the number of turns of the basic winding to meet the voltage requirements does not guarantee a constant phase shift angle

If the phase shift angle changes, it will affect the suppression of harmonics and the load balance of each phase

Transformers with simple combination of multiple bodies are often bulky and costly in materials

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