Krukova N. Increasing of compensation efficiency of external magnetic field in the three-phase switchboard by symmetrizing its construction

Object of the research is electromagnetic processes in the three-phase switchboard. The dissertation purpose is increasing of efficiency at compensation of an external magnetic field in the three-phase switchboard. Research methods and equipment are follows: the theory of a stationary magnetic field is used for analysis of the three-phase switchboard external magnetic field; the magnetic moments method and piece-linear approximation methods are used for computation of contour's currents and their structural analysis; measuring methods are used for determination of the external magnetic field intensity and magnetic moment. Theoretical and practical results are: technique of currents and the magnetic moment analysis in the three-phase switchboard taking into account its spatial frame construction at estimation of the external magnetic field at designing; the improved automatic system for external magnetic field compensation with set phases gauges in the three-phase switchboard; recommendations on symmetrization of the three-phase switchboard construction, which performance provides increase of efficiency of the external magnetic field compensation. Novelty - an improved mathematical model of the three-phase switchboard as a source of the external magnetic field, in which its magnetic moment are represented by function of set parameters that are depended of set phases; the theoretical grounding of dependence of summarized magnetic moment value from set phases in the three-phase switchboard with the three-phase currents system and frame construction, i.e. the "magnetic-phase effect"; the method of piece-orthogonal approximation for computation of mutual inductance factors, used at determination of currents and magnetic moments in the three-phase switchboard; experimental confirmation of the "magnetic-phase effect". Degree of reduction to practice - results and recommendations of the work are used in scientific reports of the Scientific and technical centre of technical object's magnetism of the National Academy of Science of Ukraine, the proposed automatic compensation system are applied into "Converter" Production Association in Zaporozhye and at carrying out of educational process in the National Technical University "Kharkov Polytechnic Institute". Sphere of application - switchgears devices , three-phase switchboards.