Hitachi Energy Ltd

Hitachi Energy Switzerland Ag

Abb Schweiz Ag

Abb Power Grids Switzerland Ag

Jedrzej Banaszczyk

Jan Czyzewski

Lukasz Matysiak

Darren Dale Tremelling

Wojciech Piasecki

Rudi Velthuis

Patrick Meier

Adam Michalik

Rongsheng Liu

Andrzej Rybak

Urs Kruesi

Krzysztof Kasza

Elio Perigo

Bartlomiej Adamczyk

Wojciech Wysocki

Lukasz Bachorz

Roger Hedlung

Marcin Tarnowski

Jan Ostlund

Michal Rzepecki

Lars Sjogren

Pawel Grysztar

The present disclosure relates to a condenser bushing including a condenser core and electrically conductive field-grading layers, which are embedded in insulating material of the condenser core and arranged around a central channel for conductor extending along an axis defining an axial direction, while an electric connection is provided to at least one of the field-grading layers, wherein pairs of neighbouring field-grading layers with the insulation material between them form sections of the condenser core of axial lengths Lthrough Land with capacitances Cthrough C, characterized in that a shape of at least one of the field-grading layers deviates from cylindricality in order to reduce non-uniformity of electric field stress of the condenser bushing compared to a corresponding condenser bushing with the cylindrical field-grading layers forming sections of the axial lengths Lthrough Land with capacitances Cthrough C.

Condenser bushing

The present disclosure relates to a bushing including an electrical conductor comprising a terminal at a first end of the bushing. The bushing also includes an electrically insulating condenser core arranged around the conductor and defining a central longitudinal through-hole through which the conductor extends. The bushing also includes a plurality of concentric field-grading layers arranged in the condenser core, comprising an inner field-grading layer and an outer field-grading layer. The bushing also includes an electrically conductive head electrically connected with the conductor passing there through, forming a gas-tight cap of the first end of the bushing outside of the condenser core, sealingly engaging a circumferential lateral outer surface of the condenser core and sealingly engaging the conductor. The bushing also includes an electrically conductive connection between the inner field-grading layer and the head.

Bushing with electrically conductive head mounted on condenser core

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

Growing community of inventors

Lodz, Poland

Jedrzej Banaszczyk