Petrova V. Withstand Нigh Voltage Insulation of Wood to the Effects of a Large Lightning Surge Current

Object of the research - electrophysical processes arising from the interaction of a high plasma channel large current pulse with a linear lightning softwood. Research objective - definition of electrodynamic resistance softwood used in wooden structures of insulation high-voltage technique , when exposed to large pulse current linear lightning. Research methods and apparatus - the fundamental tenets of the theory of Electrophysics and Electromechanics , methods of Computational Mathematics ( finite difference method for the numerical solution of differential equations , the sweep method for solving systems of linear algebraic equations ) , linear lightning current generator , a coaxial shunt capacitive voltage divider. The theoretical and practical results - developed design criterium electrodynamic resistance to wood to direct lightning strike, a method is tested on an electrodynamic solid insulation resistance to a large pulse current. Novelty - first developed computational and experimental method of determining such basic thermal and electrical characteristics of plasma channels of high-current spark discharges occurring in softwood as their radius, resistance, electrical conductivity of the plasma discharge channel , the maximum longitudinal electric field in the high-current plasma channel, the maximum pressure in the plasma channel , the maximum value of the electron temperature and the energy released in the plasma channel , first obtained the settlement criterion electrodynamic resistance "live" and "dead" softwood to the direct action of a large pulse current of lightning first obtained design formulas for determining the timing of the discharge circuit in high-current high-voltage generator artificial lightning impulse currents of electric explosion of metallic conductor; improved method for determining the resistances introduced " dead " and "live" pine timber in a low-impedance high-current discharge circuit of the pulse generator component of the current artificial lightning, have been further developed parodinamic and plasmodynamic fracture models pulp wood structure with direct hit in her line of lightning. The degree of implementation - in the development and creation of powerful high-voltage test equipment megavolt range, in the educational process in the disciplines of " high Voltage Equipment " and " Electric vehicles " at the Department of Engineering Electrophysics NTU "KPI". The scope of use - to predict the behavior of insulating structures high art of wood under the action of a direct lightning strike and settlement characterization of plasma channels sparks linear lightning .