Yatseyko A. Diagnostic of isolation of high-voltage current transformers under the working voltage

Object of research: physical and chemical processes of high-voltage isolation ageing. Purpose of work: development of scientific and technical bases of construction means for complex diagnostics of isolation of high-voltages current transformers (TC) under the working voltage for the increase of reliability of their exploitation in electrical power networks. Research methods: methods of analysis of linear electric circles, numeral methods of integration of differential equations with the use of computer simulation, the theory of full-scale experiment and statistical processing of experimental data. Theoretical and practical results and novelty: the new method of diagnostics of isolation state of current transformers under the working voltage has offered; the calculation model of internal high-voltage isolation of current transformers has improved; the possibility of conducting measuring of resistance of current transformers isolation on a direct current and incrementation of tangent of angle of dielectric losses under working voltage has offered and substantiated. Object and level of implementation: results of dissertation work are used in the educational process of Lviv National Polytechnic University and implemented in check-out phase of operation on one of the substations of NPC "Ukrenergo" Western Power System. Efficiency of implementation: increase of information awareness of the systems of isolation diagnostics. Sphere of the use: diagnostics of isolation of current transformers.