Hitachi Energy Switzerland Ag

Abb Power Grids Switzerland Ag

Jan Ostlund

Jan Czyzewski

Jedrzej Banaszczyk

Lukasz Bachorz

Bartlomiej Adamczyk

Wojciech Wysocki

Roger Hedlung

Marcin Tarnowski

The present invention refers to HV apparatus, in particular a HV dry current transformer, insulated with an insulating gel, or a voltage transformer, insulated with an insulating gel. The dry HV current transformer comprises at least two electrically conductive elements i.e. a head transformer cover, a head housing base, a core casing and a primary conductor. In the dry HV current transformer at least one of the electrically conductive elements has a coating made of solid insulating material separating the surface of the conductive elements from the insulating gel and adapted for limiting the electron emission from the conductive elements into the insulating gel. The voltage transformer comprises a bottom external housing, a bottom support flange, a core. In the voltage transformer at least one of the electrically conductive elements has a coating made of solid insulating material separating the surface of the conductive elements from the insulating gel and adapted for limiting the electron emission from the conductive elements into the insulating gel.

HV apparatus and a method of manufacturing such apparatus

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Ludvika, Sweden

Jan Ostlund