公开(公告)号：EP3528266A1

公开(公告)日：2019-08-21

申请号：EP18382087.7

申请日：2018-02-15

Applicant: ABB Schweiz AG

Inventor： Sánchez Lago, Luis ,  Roy Martín, Carlos ,  Murillo, Rafael ,  Cebrián Lles, Lorena ,  Nogués Barrieras, Antonio

IPC: H01F27/40 ,  H01F27/32 ,  G01R27/26 ,  G01R31/12

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.