Testing transformer

Abstract

A testing transformer comprises a transformer body, a first primary winding, a second primary winding and a secondary winding, wherein the transformer body is an iron core which has a single-phase four-column structure; the single-phase four columns comprise side columns on two sides, a first iron core column and a second iron core column; the first iron core column and the second iron core columnare positioned in the middle; a first primary winding, a secondary winding and a second primary winding successively sleeve each of the first iron core column and the second iron core column from inside to outside; the winding directions of the windings of the first iron core column are opposite to the winding directions of the windings of the second iron core column; on the same iron core column, the winding directions of the first primary winding and the second primary winding must be opposite to the winding direction of the secondary winding, loose portions of wire turns of regions of theupper ends and the lower ends of the windings are located at the same position on the periphery, and ampere-turn balancing of each first primary winding, the corresponding second primary winding and the corresponding secondary winding is ensured. By adjustment of arrangement of the windings, the ability of bearing high current impact of the windings is increased, a single transformer body structure of the testing transformer is realized, and the weight, size and manufacturing cost of the whole transformer are greatly reduced.

Description

Technical field [0001] The invention belongs to the field of circuits, and specifically relates to a test transformer. Background technique [0002] In order to verify the ability of electrical products to withstand short-circuit currents, the testing organization will test and verify electrical products with high currents. Large current test transformers are equipment that provides the required voltage and current for this type of test. Its primary winding is connected to the generator, and the secondary winding is connected to the test sample, which converts the constant voltage output by the generator into the voltage required for the test, and outputs the required test current (tens of kA). [0003] The operating conditions of high-voltage test transformers are usually dozens or even hundreds of strong current tests per day. Therefore, the test transformer itself must have the ability to withstand large current shocks for a long time. This is the biggest difficulty in the desig...

AI Technical Summary

Problems solved by technology

The disadvantage is that the whole transformer is heavy in weight, large in size, high in manufacturing cost and poor in economy

[0005] The reason for adopting the double body structure is that no effective technical measures have been taken to improve the ability of the winding to withstand large current impacts, and the windings can only be arranged separately.

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