PROTECTION DEVICE OF ELECTRIC SUBMERSIBLE PUMPING UNIT Russian patent published in 2007 - IPC F04B49/00 

FIELD: oil producing and processing industries; pump building.

SUBSTANCE: invention relates to method of protection of submersible pumping unit operating under conditions affecting serviceability of its systems, mainly, when operating in wells. Proposed protection device contains submersible electric motor connected with electrohydraulic pump, control unit and submersible electric motor switch-off device. Current transformer is installed in circuit o submersible electric motor to output of which time interval analyzer is connect to measure time intervals between measurements of current pulses of submersible electric motor when working member of electrohydraulic pump changes over from "working stroke" to "reverse stroke" and back. Time interval analyzer is connected by output through actuating circuit to control unit and, through the latter, to device switching off submersible electric motor with possibility of disconnection of submersible electric motor when preset value of time interval of change over of working member of electrohydraulic pump from "working stroke: to "reverse stroke" and back is exceeded.

EFFECT: improved reliability of protection device, reduced cost of equipment.

1 dwg