Hitachi Energy Switzerland Ag

Abb Power Grids Switzerland Ag

Luis Sánchez Lago

Rafael Murillo

Antonio Nogués Barrieras

Carlos Roy Martín

Lorena Cebrián Lles

Rahul R Shah

Antonio NOGUÉS Barrieras

Carlos Roy MARTÍN

Lorena CEBRIÁN Lles

Dry-type transformers with insulating modules are disclosed. Example insulating modules include dielectric screens and supporting blocks. The supporting blocks support the dielectric screens over windings of the transformer. The dielectric screens have first substantially even portions configured to adapt in spaces defined by corresponding cylindrical barriers arranged between first and second windings of the transformers and second substantially even portions, transversal to the first portions and to the first windings of the transformers and extending outwards from the first portions and beyond the supporting blocks. The dielectric screens partly extend around a winding.

Insulating transformers

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.

Insulation of non-liquid immersed transformers

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Vigo, Spain

Luis Sánchez Lago