High-voltage power inverter of the generator “Energy-2” for electromagnetic soundings and monitoring of the earthquake source zones

Abstract

Development of powerful generators of the alternating current working from an industrial network in a wide spectrum of ULF-ELF frequencies range (0.1–200 Hz) is a prospective direction of researches in the field of creation of effective means for electromagnetic monitoring of earthquakes focuses. The present article is devoted to description of the successive stage of works on creation of generator “Energy-2” with capacity up to 200 kW, operating from an industrial three-phase network of 380 V voltage and frequency of 50 Hz. The schematic concept, element base and parameters of the output high-voltage power inverter of up to 1100 V voltage and 400 A current are described. In the course of designing the design documentation was developed, the drawings and circuits were made, the accessories were got, bearing structures were manufactured in skilled-industrial workshops, as well as heat-protective units radiators and ventilators, settlement-theoretical works and computer modeling was carried out. The main basic element of novelty was development of the system providing the programmed (arbitrary) form of current signals in a wide spectrum of frequencies from 0.1 to 200 Hz at power consumption of up to 200 kW. The created unit of the high-voltage inverter is designed for installation in the car body of motor vehicle ZIL-131 in the set with other units of multipurpose generator “Enerrgy-2” with the capacity of up to 200 kW. The important feature of the inverter is its multifunctionality. It permits to use the generating complex Energy-2 for monitoring of earthquake focuses in one of three modes frequency sounding, formation of the field or induced polarization. Selection of on of three monitoring modes depends on the characteristics of seismically active environment and purposes of the Earth crust sounding.