Grechko V. Electromagnetic sensors for high-voltage electronic current transformer.

The оbject of research: intellectualization of electrical network. The purpose of research: development of a scientific and technical basis of construction of electromagnetic sensors for an electronic current transformer according to the concept of creation of intellectual electrical networks and requirements of the normative documents in this sphere. Methods of research: methods of mathematical modeling and circuit simulation, of theory of electrical circuits, of theory of measurement errors, of theory of similarity and physical modelling. Theoretical and practical results and innovations: metrological characteristics of sensors requirements are developed for measuring and protective electronic current transformer (ECT) outputs; necessary number of sensors of different functional purpose are substantiated; types of sensors of protective output of ECT according to International Electrotechnical Commission (IEC) standards are specified; selection of a material of cores of sensors is substantiated; instrument security factor generalized relationships are obtained; method of calculation of electromagnetic system of measuring sensor is worked out; analytical expressions for determination of peak value of magnetization current, time to its achievement and peak value of total error of current sensors for protection devices when applying double duty cycle of primary current initiation in compliance with IEC standards are derived; technique of calculation of parameters of sensor for protection in the mode of an automatic reclose of high-voltage electrical network is developed. A subject degree of introduction: introduction as "Technique of calculation of parameters of electromagnetic systems based on cores of nanocristalline and amorphous alloys and electric steels of current transformers with 10 kV rated voltage" and draft engineering specifications for current transformers (CTs) with 10 kV rated voltage and 0,2S accuracy class; applied by G. V. Kurdyumov Institute for Metal Physics (Kyiv) and LLC "Melta" for creation and production of CTs. Effectiveness of implantation: improvement of engineering-and-economical performance of CTs. Sphere of use: primary measuring current transducers.