# US 10,872,721 B2 · High voltage winding and a high voltage electromagnetic induction device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,872,721 B2 - Document ID: US10872721B2 - Status: Granted - Kind: B2 - Application number: 16/495,025 - Filed: 2018-02-08 - Published: 2020-01-09 - Granted: 2020-12-22 - Earliest claimed: 2017-03-24 - Assignees: ABB Power Grids Switzerland AG - Applicants: ABB Power Grids Switzerland AG - Inventors: Manoj Pradhan; Abdolhamid Shoory; Jonas Ekeberg; Venkatesulu Bandapalle; Rafael Murillo - Web page: https://patentgrep.com/patent/US10872721B2 ## CPC - H01F 27/32: Insulating of coils, windings, or parts thereof - H01F 27/24: Magnetic cores - H01F 27/288: {Shielding} - H01F 27/323: {Insulation between winding turns, between winding layers} - H01F 2027/329: {Insulation with semiconducting layer, e.g. to reduce corona effect} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A high voltage winding for a single electrical phase of a high voltage electromagnetic induction device, wherein the high voltage winding comprises: a first winding part, and a second winding part, wherein the first winding part comprises: a first conductor, a first solid electrical insulator circumferentially enclosing the first conductor, and a first semi-conductive sheath circumferentially enclosing the first solid electrical insulator, wherein the first semi-conductive sheath is earthed or connected to an electric potential that is lower than a rated voltage of the high voltage winding, and wherein the second winding part comprises: a second conductor, and a second solid electrical insulator circumferentially enclosing the second conductor and forming an outermost layer of the second winding part. ## Claims ### Claim 1 A high voltage winding for a single electrical phase of a high voltage electromagnetic induction device, wherein the high voltage winding comprises: a first winding part, and a second winding part, wherein the first winding part includes: a first conductor, a first solid electrical insulator circumferentially enclosing the first conductor, and a first semi-conductive sheath circumferentially enclosing the first solid electrical insulator, wherein the first semi-conductive sheath is earthed or connected to an electric potential that is lower than a rated voltage of the high voltage winding, and wherein the second winding part includes: a second conductor, and a second solid electrical insulator circumferentially enclosing the second conductor and forming an outermost layer of the second winding part. ### Claim 2 (depends on 1) The high voltage winding as claimed in claim 1, wherein the first conductor has a bushing connection end configured to be connected to a bushing, the first winding part being configured to be connected between a bushing and the second winding part. ### Claim 3 (depends on 1) The high voltage winding as claimed in claim 1, wherein the first solid electrical insulator is made of cross-linked polyethylene, XLPE. ### Claim 4 (depends on 1) The high voltage winding as claimed in claim 1, wherein the first solid electrical insulator is made of silicone rubber or epoxy. ### Claim 5 (depends on 1) The high voltage winding as claimed in claim 1, wherein the second solid electrical insulator is cast in an electrically insulating material. ### Claim 6 (depends on 5) The high voltage winding as claimed in claim 5, wherein the second solid electrical insulator includes a resin. ### Claim 7 (depends on 1) The high voltage winding as claimed in claim 1, wherein the second solid electrical insulator is made of Nomex®. ### Claim 8 (depends on 1) The high voltage winding as claimed in claim 1, comprising a second semi-conductive sheath circumferentially enclosing the first conductor, wherein the second semi-conductive sheath is arranged radially inwards of the first solid electrical insulator. ### Claim 9 A high voltage electromagnetic induction device comprising: a magnetic core including a limb, and a high voltage winding arranged around the limb and having: a first winding part, and a second winding part, wherein the first winding part includes: a first conductor, a first solid electrical insulator circumferentially enclosing the first conductor, and a first semi-conductive sheath circumferentially enclosing the first solid electrical insulator, wherein the first semi-conductive sheath is earthed or connected to an electric potential that is lower than a rated voltage of the high voltage winding, and wherein the second winding part includes: a second conductor, and a second solid electrical insulator circumferentially enclosing the second conductor and forming an outermost layer of the second winding part. ### Claim 10 (depends on 9) The high voltage electromagnetic induction device as claimed in claim 9, comprising a bushing, wherein the first winding part is connected between the bushing and the second winding part. ### Claim 11 (depends on 9) The high voltage electromagnetic induction device as claimed in claim 9, comprising a secondary winding, wherein the high voltage winding is a primary winding and the secondary side winding is arranged around the limb. ### Claim 12 (depends on 11) The high voltage electromagnetic induction device as claimed in claim 11, wherein the primary winding is arranged radially outwards of the secondary winding or the primary winding is arranged radially inwards of the secondary winding. ### Claim 13 (depends on 9) The high voltage electromagnetic induction device as claimed in claim 9, comprising a cable termination configured to connect the first winding part with the second winding part. ### Claim 14 (depends on 2) The high voltage winding as claimed in claim 2, wherein the first solid electrical insulator is made of cross-linked polyethylene, XLPE. ### Claim 15 (depends on 2) The high voltage winding as claimed in claim 2, wherein the first solid electrical insulator is made of silicone rubber or epoxy. ### Claim 16 (depends on 2) The high voltage winding as claimed in claim 2, wherein the second solid electrical insulator is cast in an electrically insulating material. ### Claim 17 (depends on 2) The high voltage winding as claimed in claim 2, wherein the second solid electrical insulator is made of Nomex®. ### Claim 18 (depends on 2) The high voltage winding as claimed in claim 2, comprising a second semi-conductive sheath circumferentially enclosing the first conductor, wherein the second semi-conductive sheath is arranged radially inwards of the first solid electrical insulator. ### Claim 19 (depends on 10) The high voltage electromagnetic induction device as claimed in claim 10, comprising a secondary winding, wherein the high voltage winding is a primary winding and the secondary side winding is arranged around the limb.