| Abstrakt: |
Selective fragmentation, with applications in geology (rock fragmentation), demolitions (concrete disintegration), and ecology (processing the electric/electronic waste and the slag resulted after burning the household waste), and welding different materials by using electron beams are just two of the latest electrotechnologies that include special high voltage sources. This paper presents general aspects, designing and constructive elements, and experimental results for two high voltage sources included in the above-mentioned electrotechnologies: (1) source of high voltage repetitive impulses for selective fragmentation, and (2) DC source for feeding electron guns in welding installations. The first source is designed based on the classic Marx high voltage generator, with four stages, for the following parameters: impulse voltage of 200 - 300 kV, impulse rise-time of about 300 ns, and impulse repetition frequency of 3 - 10 Hz. The DC source for welding installations was built based on an original idea at a voltage of 3.3/6.5 kV, electrically isolated, and it is powered from battery. The conducted tests and experiments showed that this is a reliable solution with high-energy efficiency, which can successfully replace isolation transformers in welding installations thus allowing substantial space and material savings. [ABSTRACT FROM AUTHOR] |
