FIELD: power supply of electric circuit of borehole tool. SUBSTANCE: turbo-generator of equipment for examination of holes in process of drilling has body with hole for passage of fluid through turbo-generator, hydraulic turbine, unit of its support with pressure compensator and electric machine generator. Body of turbo-generator carries controller of flow rate of drilling fluid passing through hydroturbine. Unit of support of shaft of hydroturbine is placed into oil-filled protective body and electric machine generator is put into air atmosphere separated from oil-filled part by separator made from diamagnetic material mounted between driving and driven parts of magnetic clutch of contact-free rotation transmission from shaft of turbine to shaft of electric machine generator. EFFECT: enhanced operational reliability of turbo- generator. 1 cl, 2 dwg
