公开(公告)号：US20210050145A1

公开(公告)日：2021-02-18

申请号：US16970215

申请日：2019-02-14

Applicant: ABB Power Grids Switzerland AG

Inventor： Luis SÁNCHEZ LAGO ,  Carlos ROY MARTÍN ,  Rafael MURILLO ,  Lorena CEBRIÁN LLES ,  Antonio NOGUÉS BARRIERAS

IPC: H01F27/32 ,  H01F27/24 ,  H01F27/29 ,  H01F27/28 ,  G01R31/12 ,  G01R31/16

Abstract: Non-liquid immersed transformers and methods of measuring aging degree of the transformers' insulation are disclosed. The transformers comprise a solid insulation inside the conductive coil and one or more floating electrodes in the solid insulation. At least a part of the conductive coil and the one or more floating electrodes may form one or more capacitive elements, respectively. An electrical parameter, e.g. complex permittivity, of the capacitive element is measured and the aging degree is calculated as a function of the electrical parameter measurement.