Converter Station
First Claim
1. A converter station for connecting an AC system to a bipolar HVDC transmission line, said station comprising:
- two converters each having a DC-side thereof connected to a respective one of two poles of said transmission line on high potential and to a neutral bus for that pole of a DC neutral arrangement in common to the converters on zero potential by being earthed, and having an AC-side connected to said AC system,said DC neutral arrangement having a member connecting to at least one electrode line and the arrangement being provided with first DC breakers enabling breaking of a first current path from the neutral bus of one pole to the neutral bus of the other pole at bipolar operation of the station for changing to monopolar operation thereof,the station also comprising a control device adapted to control a said changing from bipolar to monopolar operation by controlling a said first DC breaker to open said current path between said two neutral buses and establish a current path to said electrode line connecting member for diverting the current from said one pole thereto,wherein said DC neutral arrangement has in said first current path at least two first DC breakers connected in series and adapted to act as a backup for each other would the other thereof fail to break said first current path upon a control of said control device to change from bipolar to monopolar operation.
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Accused Products
Abstract
A converter station for connecting an AC system to a bipolar HVDC transmission line. A DC neutral arrangement is provided with first DC breakers enabling breaking of a first current path from a neutral bus of one pole of the transmission line to a neutral bus of another pole at bipolar operation of the station for isolation of a faulty section and changing to monopolar operation/metallic return thereof. The DC neutral arrangement has in the first current path at least two first DC breakers connected in series and adapted to act as a backup for each other would the other thereof fail to break the first current path upon a control to isolate a faulty section by changing from bipolar to monopolar operation.
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Citations
13 Claims
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1. A converter station for connecting an AC system to a bipolar HVDC transmission line, said station comprising:
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two converters each having a DC-side thereof connected to a respective one of two poles of said transmission line on high potential and to a neutral bus for that pole of a DC neutral arrangement in common to the converters on zero potential by being earthed, and having an AC-side connected to said AC system, said DC neutral arrangement having a member connecting to at least one electrode line and the arrangement being provided with first DC breakers enabling breaking of a first current path from the neutral bus of one pole to the neutral bus of the other pole at bipolar operation of the station for changing to monopolar operation thereof, the station also comprising a control device adapted to control a said changing from bipolar to monopolar operation by controlling a said first DC breaker to open said current path between said two neutral buses and establish a current path to said electrode line connecting member for diverting the current from said one pole thereto, wherein said DC neutral arrangement has in said first current path at least two first DC breakers connected in series and adapted to act as a backup for each other would the other thereof fail to break said first current path upon a control of said control device to change from bipolar to monopolar operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification