POWER TAKEOFF DEVICE AND PIPELINE ELECTRIC HEATING SYSTEM CONTAINING SUCH DEVICE Russian patent published in 2024 - IPC F16L53/35 H05B3/56 H05B6/10 

FIELD: electric heating.

SUBSTANCE: disclosed group of inventions relates to electrical heating systems, as well as to secondary power sources, in particular to devices for power takeoff from a heating conductor. Power take-off device contains two current transformers with channels and secondary windings, to the output terminals of which a load is connected through the control unit. Conductor is laid through the channels of the current transformers, which is connected by means of connecting couplings to a heating conductor connected to an alternating current source. Current transformers are located in connection box or remote cabinet. In the version, the inductive-resistive heating conductor includes a central conductor, an inner insulating layer and a ferromagnetic outer conductor located coaxially above them. Connection box is made of a current-conducting material with magnetic properties and is connected to an external ferromagnetic conductor. Pipeline electric heating system comprises heating conductor connected to AC source and power takeoff device.

EFFECT: efficient power takeoff from heating conductor of various systems of electric heating of pipelines without local reduction of linear power of heating in zone of transformer installation, as well as essential modifications of electric heating system.

18 cl, 7 dwg