High voltage device
View Patent ↗The invention relates to a high voltage device for providing electrical insulation of a conductor extending through the device. The device includes a hollow insulator; a conductor extending through the hollow insulator; a field gradient decreasing arrangement including a condenser core and a voltage grading shield. The condenser core and the voltage grading shield are arranged around the conductor inside the hollow insulator in a manner so that the voltage grading shield is arranged around at least part of the condenser core.
1. A high voltage device for providing electrical insulation of a conductor extending through the device, the device comprising:
a hollow insulator;
a conductor extending through the hollow insulator;
a field gradient decreasing arrangement comprising a condenser core and a voltage grading shield, the condenser core and the voltage grading shield being arranged around the conductor inside the hollow insulator in a manner so that the voltage grading shield is arranged around at least part of the condenser core.
2. The high voltage device of claim 1 , further comprising
a flange for connecting the high voltage device to a grounded plane; wherein
the condenser core comprises a plurality of coaxially arranged foils extending along the axial direction of the conductor, wherein at least one foil is arranged to have a potential which is, out of the potentials of the plurality of foils, most similar to the potential of the flange; and wherein
the voltage grading shield extends, in the axial direction of the conductor, beyond at least one end of the at least one foil(s) arranged to have a potential that is most similar to the potential of the flange.
3. The high voltage device of claim 1 , wherein
the voltage grading shield extends beyond at least one end of the condenser core in the axial direction of the conductor.
4. The high voltage device of claim 1 , further comprising
a high voltage shield arranged around the conductor at at least one end of the con-denser core.
5. The high voltage device of claim 1 , further comprising
a flange for connecting the high voltage device to a grounded plane; wherein
the voltage grading shield is arranged to extend on both sides of the flange in the axial direction of the conductor.
6. The high voltage device of claim 1 , further comprising
a flange for connecting the high voltage device to a grounded plane; wherein
the voltage grading shield is confined to one side of the flange in the axial direction of the conductor.
7. The high voltage device of claim 5 , wherein the voltage grading shield is electrically connected to the flange.
8. The high voltage bushing of claim 1 , wherein
the hollow insulator contains an insulating gas, such as SF 6 .
9. The high voltage device of claim 1 , wherein
the condenser core comprises resin impregnated paper providing insulation between foils.
10. The high voltage device of claim 1 wherein the high voltage device is a bushing, such as a wall bushing or a trans-former bushing.
11. A transformer station comprising a device according to claim 1 .
12. A High Voltage Direct Current station comprising a device according to claim 1 .