Tap changer and a transformer arrangement comprising the tap changer
AssigneeHitachi Energy Ltd
InventorsTommy Larsson, Jean Louis Gérard Mathae
Life of this patent
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Abstract
The disclosure relates to a tap changer arranged to be connected to a regulating winding of a rated regulation voltage. The tap changer comprises a diverter switch, a tap selector and a set of tap changer contacts. The tap selector and the diverter switch are encapsulated in a shielding structure arranged to shield the tap selector and the diverter switch from an external electrical field, the shielding structure being arranged to be electrically connected to a connected tap of the regulating winding. The disclosure further relates to transformer arrangement comprising at least one such tap changer.
Claims18
A tap changer arranged to be connected to a regulating winding of a rated regulation voltage, the tap changer comprising:
- a diverter switch;
- a tap selector;
- and
- a set of tap changer contacts;
- wherein the tap selector and the diverter switch are encapsulated in a shielding structure arranged to shield the tap selector and the diverter switch from an external electrical field, the shielding structure being arranged to be electrically connected to a connected tap of the regulating winding;
- wherein the shielding structure comprises a first compartment and a second compartment separated by an electrically insulating barrier, and wherein the first compartment comprises a first insulating medium and the diverter switch, and wherein the second compartment comprises a second insulating medium and the tap selector.
A transformer arrangement comprising:
- a transformer having at least one regulating winding of a rated regulation voltage, the at least one regulating winding having taps;
- at least one tap changer, having a shielding structure, the at least one tap changer arranged to be connected to a regulating winding of a rated regulation voltage, each of the at least one tap changer comprising:
- a diverter switch;
- a tap selector;
- and
- a set of tap changer contacts, wherein the tap selector and the diverter switch are encapsulated in the shielding structure arranged to shield the tap selector and the diverter switch from an external electrical field, the shielding structure being arranged to be electrically connected to a connected tap of the regulating winding;
- and
- wherein each of the at least one tap changer is electrically connected to a respective regulating winding such that its shielding structure is electrically connected to a connected tap of the respective regulating winding;
- wherein the shielding structure comprises a first compartment and a second compartment separated by an electrically insulating barrier and wherein the first compartment comprises a first insulating medium and the diverter switch and wherein the second compartment comprises a second insulating medium and the tap selector.
Dependencies are inferred from the claim text.