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Domestic commonly used in mechanical/composite drill rig, 3 ~ 4 diesel engine and vehicle and electric drill with 3 ~ 4 sets of diesel generator set grid as power. With oil prices rising, drilling cost increasing, and the complex structure of diesel engine, is out of order, large amount of maintenance, mechanical rig can't stepless speed regulation, the technical performance is poor, unable to better meet low pump speed, small displacement, such as cement grouting process requirement.My company developed for composite and mechanical/electric drill for oil change electricity scheme, using SVG static reactive power generator, using oil field area of 35 kv and 10 kv (6 kv power grid to power drill, truly green drilling zero emissions.