Asea Brown Boveri Ab

Arb Power Systems Ab

Yuri Iossel

Alexey Poliakov

Heiko Gebhardt

Grigory Kazarov

Veijo Koski

A land electrode has at least one feeding element connected to an electrode line of a high voltage direct current (HVDC) transmission system. The land electrode is in electric contact with a conducting medium and further comprises at least two electrically non-conducting element barriers, spaced apart along the feeding element. Between the element barriers, an active part of the surface of the feeding element is formed, which active part is in electric contact with the conducting medium. The element barriers have a substantial extension outwards from the active part of the surface of the feeding element into the first conducting medium, so as to homogeneize the current distribution along the active part of the surface of the feeding element.

Land electrode for a high voltage direct current transmission system

A sea electrode (,) for grounding of a high voltage direct current transmission system comprises an electrically conducting electrode body (,) for connection to the transmission system and at least one ballast (,) located above the electrode. The electrode further comprises a layer (,) of an electrically non-conducting material, located above the electrode body and extending over it, so as to influence the maximum electrical field strength not to exceed a desired level at a point (P) at the edge of the non-conducting layer and thereby also in the sea water outside a zone (,) located below the non-conducting layer and in a vertical direction limited by the edge of the non-conducting layer.

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Helsinki, Finland

Yuri Iossel