FIELD: mining industry. SUBSTANCE: system relates to wireless transmission of electric signals and/or electric power along bore-hole of underground drilling well downwards and back. System for transmitting electricity downwards along bore-hole of well uses wall of current-conducting pipe wound on drum. External surface of pipe is coated with electrical insulating material. Current-conducting pipe is made of metal. Usable in function of drum-wound pipe is operating pipe, hydraulic line of hydraulic power transmission system, flowing medium line, drilling pipe. Transmission of electric power from its source on surface to control device downward is carried out without any electric wiring. Application of system allows for establishing reliable and effective electric communication line which can be easily installed in bore-hole. EFFECT: higher efficiency. 10 cl, 4 dwg
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