Super-large volume loading voltage regulation autotransformer

Abstract

Core and winding assemblies in constant magnetic flux and variable magnetic flux are setup in the disclosed transformer. There are common winding, excitation winding (1) and regulating winding in the former core and winding assembly, and there are series winding and excitation winding (2) in the latter core and winding assembly. The said common winding is cascaded to series winding. The excitation winding (1), excitation winding (2) and regulating winding are connected in series. Changing connected number of turns between excitation winding (2) and regulating winding or direction of magnetic field can change voltage output from transformer. Comparing with single core and winding assemblies of variac, the disclosed transformer possesses advantages of large capacity and high ability of anti vibration potential.

Description

technical field [0001] The invention relates to an autotransformer, in particular to an autotransformer with adjustable voltage when super-large capacity is loaded. Background technique [0002] At present, the commercially available three-phase autotransformer has a single-body transverse flux structure. Each core column is equipped with a common coil, a series coil and a voltage regulating coil to form an auto-coupling connection circuit. When the number of turns of the series coil is small, it is found that When it is subjected to lightning shock waves or power grid overvoltage shock waves, an oscillation potential three times higher than the normal value will be generated on the voltage regulating coil, which will easily cause inter-line and inter-turn insulation breakdown and cause short-circuit accidents. Most people use reinforced insulation to solve their technical problems, but this makes the design more difficult, the production cost increases, the product weight i...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the existing three-phase autotransformer voltage regulating coil high oscillation potential, difficult to deal with insulation between lines and turns, high production cost, heavy weight, complex process, low product quality pass rate and when the number of turns in series is small To a certain extent, the insulation problem of the above-mentioned conventional structure cannot be designed. The present invention provides a super-large-capacity self-coupling on-load tap changer, which not only reduces the oscillation potential, but also can adjust the working voltage and line-to-line , The inter-turn insulation level is easy to guarantee, the short-circuit fault is reduced, the safety factor is improved, and the service life is long

Images