Ivanov V. Improvement of High Voltage Pulse Transformers with Semiconductor Switches for Electrotechnological Plants

The subject of the investigation is electromagnetic processes in pulsed generators of high voltage and great currents for technological electrical plants. The objective of the investigation is improvement of pulsed transformers with semiconductor switches to produce maximal amplitudes of voltage and currents. The methods of investigation are methods of electric circuits, original and traditional methods of measuring and statistic processing of the results. The theoretical and practical results: pulsed transformers with low leakage inductance and voltage up to 1 MV were created; the proposed circuit design with two pulsed transformers enabled to create compact pulsed voltage source with pulse rise time 250 ns on capacitance of 1 nF and voltage up to 1 MV; the compact high-voltage pulsed generator on the basis of pulsed transformer with semiconductor switches with pulse repetition frequency up to 50 000 p/s was made; recommendations on questions of electromagnetic compatibility of controlled semiconductor switches of electrotechnological plants in conditions of strong electromagnetic interference were given. Scientific novelty: voltage pulse rise time less 100 ns at capacitance 0.5 nF with voltage up to 1 MV from pulsed transformer on steel crosswise magnetic core was firstly experimentally obtained; magnetic core in pulsed transformer was improved which enabled to reduce leakage inductance to one-third by making it crosswise and separated disposition of windings, and rational distribution of magnetic flux;it was experimentally shown that there no fundamental limitations on voltage amplitude U at terminals of high-voltage winding of pulsed transformer with capacitive load if energy source is magnetization inductance with current amplitude in it; energy recuperation with help of semiconductor switches and rational selection of time moments of switching on and off these switches was firstly proposed and realized; operation modes of high-voltage generators on the basis of pulsed transformer with semiconductor switches as breaking switches that afford absence of short surges with inadmissibly high amplitude at semiconductor switch during its breaking were proposed and realized. The degree of introduction: the results of the investigation were intrduced in RDI "Molniya" STU "KPI", at PAT "Yasinovsk coke- chemical plant", in teaching process of STU "KPI". Field of application: at enterprises of coke and chemical industry, purification of gas emissions, in scientific and research institutes and in teaching process.