Static on-load stepless voltage regulating transformer

Abstract

The invention discloses a static on-load stepless voltage regulating transformer, and belongs to the technical field of electrical control. In order to realize contactless stepless voltage regulation of the on-load voltage regulation transformer, a magnetic control voltage regulator which is formed by a three-phase three-column type magnetic control reactor without harmonic waves and a three-phase compensation transformer is connected in series with a three-phase transformer to form the static on-load stepless voltage regulation transformer. The three-phase compensation transformer is provided with a current winding and a voltage winding. And the three-phase three-column magnetically controlled reactor is connected in series with a current winding of the three-phase compensation transformer to form a current regulation and control unit. And the voltage winding is connected in series with the three-phase transformer. By controlling the current of the three-phase three-column magnetically controlled reactor, the current of the current regulation and control unit is linearly changed, so that the voltage of the voltage winding and the output voltage of the three-phase transformer are linearly changed. The circuit has the characteristics of low loss, long service life, high reliability and contactless and stepless voltage regulation.

Description

technical field [0001] The invention relates to a static on-load stepless voltage regulating transformer belonging to the technical field of electric control. [0002] technical background [0003] The existing on-load tap-changing transformers basically use on-load tap-changers to switch the taps of the transformer windings and implement step-by-step voltage regulation with contacts. Its shortcoming is that it is difficult for mechanical switches with contacts to break at the moment when the current crosses zero, so arcing and operating overvoltage are inevitable. Due to the mechanical drive / transmission mechanism and the forced repeated breaking of the contacts, mechanical fatigue, arc ablation and other problems are prone to occur, resulting in mechanical or electrical failures. Under the action of arc ablation, transformer oil is prone to electrochemical reactions and deterioration. Not only there are hidden concerns in terms of adjustment accuracy and reliability, but a...

AI Technical Summary

Problems solved by technology

Its disadvantage is that it is difficult for mechanical switches with contacts to break at the moment when the current crosses zero, so arcing and operating overvoltage are inevitable.

Due to the mechanical drive / transmission mechanism and the forced repeated breaking of the contacts, mechanical fatigue, arc ablation and other problems are prone to occur, resulting in mechanical or electrical failures. Under the action of arc ablation, transformer oil is prone to electrochemical reactions and deterioration

Not only there are hidden concerns in terms of adjustment accuracy and reliability, but also regular power outage maintenance and repairs are required, which not only increases the workload, but also increases the cost

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