FIELD: mining.
SUBSTANCE: system (100, 200) comprises device (102, 202) for lifting liquid, located in well (106, 206) and comprising electric motor (108, 208), three-phase cable (114, 214) for connection of liquid lifting device with power supply (112, 212), at least one high-sensitivity differential current transformer (104, 203, 204) for generating unbalance signals (128, 227) representing unbalance current in at least one of the electric motor and the three-phase cable, wherein said at least one high-sensitivity differential current transformer is located so as to surround at least a portion of three-phase cable, and processing subsystem (136, 236) for monitoring the state of at least one of the liquid lifting device and the three-phase cable based on the unbalance signals.
EFFECT: technical result consists in improvement of efficiency of monitoring the condition of the liquid lifting device.
20 cl, 5 dwg
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