Methods for determining the scattering of transformer windings individually

• Main Author: Popov I. P.
• Format: Article
• Language: Russian
• Published: Murmansk State Technical University 2019-12-01
• Series: Vestnik MGTU
• Subjects: transformer; winding; scattering; inductive; capacitive; flux linkage; magnetic flux; трансформатор; обмотка; рассеяние; индуктивный; емкостный; потокосцепление
• Online Access: http://vestnik.mstu.edu.ru/show-eng.shtml?art=2045

The total leakage reactance of the transformer with concentric cylindrical windings depends on the thickness of the coils and the gap between them. Existing methods do not allow measuring reactance of scattering for each winding of a transformer separately, therefore, for simplicity they are often considered equal to each other. In fact, in relation to the case under consideration, they are essentially not equal. In fact, the calculation of the flux linkage of the external winding shows that its reactive scattering resistance is greater than the total scattering resistance of both windings. Two circumstances follow from this. First, the internal winding of the transformer absorbs magnetic flux to a greater extent than it scatters (scatters its magnetic flux, absorbs from the external winding). The second is that its (equivalent) scattering reactance is capacitive. The purpose of the study is to justify the possibility of experimental determination of the scattering reactance for each transformer winding separately. The relevance of the work is due to the widespread distribution of transformers. The dissipation reactance of each winding of the transformer individually can be determined by at least three experimental methods that give satisfactory agreement between the results. An almost paradoxical result is the capacitive nature of the scattering resistance of the inner winding of the transformer obtained only for concentric cylindrical windings. It should not be generalized to other types of windings. The presented experimental methods are not tied to the nature of the reactivity of scattering resistances. They are universal and can be used with any type of windings. The results obtained are recommended for use in the design and study of transformers.