FIELD: oil industry, intensified oil production by means of sucker-rod pumps under complex geological conditions. SUBSTANCE: centrifugal down-pump plant comprises downhole electric pump aggregate integrating electric motor and hydraulic protection, pump and cable line sunk into hole on rising tubing string, mouth equipment, control station and transformer. Lower part of plant houses electrode insulated from frame and electrically coupled to common point of windings of electric motor which are star-connected through diode assembly. Positive terminal of diode assembly is connected to electrode. EFFECT: increased efficiency of oil lifting under complex geological and technical conditions. 1 dwg
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