Magnetic field of current transformer
Keywords:current transformer, a magnetic field, vector diagram, equivalent circuit, leakage flux, main magnetic flux, free part of the magnetic circuit, criterion of non-uniformity of magnetic flux distribution, current and angular errors of the transformer
Purpose. Development of equivalent circuits based on a detailed analysis of the magnetic field distribution in asymmetric CT structures and drawing up a mathematical model for calculating errors in relation to a multi-range built-in CT with a toroidal MC and a single-turn primary winding with different filling of the MC with turns of the secondary winding.
Methodology. Experimental study of the magnetic field distribution in a toroidal current transformer and transformer errors
Findings. The equivalent circuits of the current transformer, which adequately reflect the distribution of the magnetic field in the magnetic circuit of the transformer and a mathematical model for calculating the errors, were developed.
Originality. Based on the results of modeling in FEMM and experimental studies, the nature of the distribution of the magnetic field with partial filling of the magnetic circuit with turns of the secondary winding was determined, and equivalent circuits of the current transformer were developed.
Practical value. A mathematical model was developed for calculating the distribution of the magnetic field in the magnetic circuit and the transformer errors, on the basis of which a program for calculating the errors of current transformers was compiled.
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