Electric device with forced direct cooling
An electric device for connection to a high voltage includes an active part having a magnetizable core and at least one winding arrangement, each surrounding a core section of the core and having windings inductively coupled together, forming cooling channels in the windings. A boiler is filled with insulating fluid and the active part is completely disposed therein. The boiler has at least one insulating fluid inlet and at least one insulating fluid outlet interconnected by a circulation system outside of the boiler having a cooling unit and a pump for circulating the insulating fluid. The electric device has improved cooling achieved by each insulating fluid inlet being connected to a distributing unit, which is disposed on one of the end sides of the winding assembly, via an insulating fluid line extending in the boiler, the distributing unit distributing cooled insulating fluid to the cooling channels.
1 . An electric device for connection to a high voltage, the electric device comprising:
an active part having a magnetizable core with a core section and at least one winding arrangement surrounding said core section, said at least one winding arrangement having end sides and having windings coupled inductively to one another, said windings having cooling channels formed therein;
a boiler filled with an insulating fluid, said boiler completely enclosing said active part, said boiler having at least one insulating fluid inlet and at least one insulating fluid outlet;
a circulation system interconnecting said at least one insulating fluid inlet and said at least one insulating fluid outlet, said circulation system disposed outside said boiler and including a cooling unit and a pump for circulating the insulating fluid;
a distribution unit disposed at one of said end sides of said winding arrangement for distributing cooled insulating fluid to said cooling channels;
said distribution unit having a perforated plate bearing against a rear side of said intake unit, and said distribution unit is fitted with spacers on a side of said distribution unit facing away from said intake unit; and
an insulating fluid line extending in said boiler and connecting said at least one insulating fluid inlet to said distribution unit.
2 . The electric device according to claim 1 , wherein said insulating fluid line is a piece of tubing.
3 . The electric device according to claim 1 , wherein said insulating fluid line has an outlet orifice, said distribution unit has an intake unit with a front side facing said at least one insulating fluid inlet, said intake unit has a through opening configured to receive said outlet orifice, and said intake unit has a rear side provided with inner grooves.
4 . The electric device according to claim 3 , wherein said grooves have an annular shape and are connected to said through opening.
5 . The electric device according to claim 3 , wherein said distribution unit has through bores.
6 . The electric device according to claim 5 , which further comprises an outer sealing ring, said perforated plate, said spacers and said outer sealing ring delimiting distribution cavities each connected to at least one of said cooling channels.
7 . The electric device according to claim 6 , wherein said intake unit and said perforated plate are disks.
8 . The electric device according to claim 1 , wherein said distribution unit has a circular outer contour in a plan view.
9 . The electric device according to claim 1 , wherein said distribution unit is formed of an electrically non-conductive material.
10 . The electric device according to claim 1 , wherein said boiler has two metal end covers, and a central part formed of an electrically non-conductive material extends between said two metal end covers.
11 . The electric device according to claim 1 , wherein said spacers have a constant spacing therebetween, radiate toward a common center point and create sector-shaped cavities for uniform active distribution of the cooled insulating fluid.