SF6-INSULATED DEVICE OPERATED AT LOW TEMPERATURES Russian patent published in 2015 - IPC H01H33/56 

FIELD: electricity.

SUBSTANCE: invention is related to core and dead-tank SF6-circuit breakers, measuring transformers, cells of gas-insulated switchgear (GIS) of indoor and outdoor design with air-SF6 inputs. The device includes a heater, a hollow insulator and tube inside the hollow insulator, the above insulator and tube are interconnected hermetically by their lower parts directly or by means of other components, at that the cavity formed between the tube and insulator is at least partially filled with electric insulating fluid. Convective motion of fluid ensures heat transfer from the heater to all elements of the device insulating construction thus preventing SF6 condensation and reduction in gas density. The cavity includes at least one partition and is limited by an elastic wall additionally. Introduction of partitions in the above cavity and placement of partitions in it promotes intensified convective motion and allows decrease in powerful heating.

EFFECT: reduced energy costs for maintenance of SF6 devices operability during winter time and increased operational reliability.

8 cl, 2 dwg