Overvoltage protection for a direct current transmission

Details Overvoltage protection for a direct current transmission Overvoltage protection for a direct current transmission

H - Electricity

02

H

321/91

H02H 7/125 (2006.01) H02H 3/38 (2006.01) H02H 7/127 (2006.01) H02H 7/26 (2006.01) H02M 7/757 (2006.01)

Patent

CA 1036668

ABSTRACT OF THE DISCLOSURE: Rectifier station for a high voltage direct current transmission line comprising a rectifier bridge with a control system. It is characterised in that in order to limit the di- rect voltage of the station in the event of disturbances on the transmission, the control system is provided with devices for sensing the direct voltage of the station and the derivative of this voltage. Those sensing devices are arranged to deliver signals to limit the voltage increase of the station when that voltage and derivative exceed given values by increasing the delay angle of the station. The control system comprises a summator for summing up the values of the voltage and derivative whereas the limiting signal is delivered when the sum exceeds a given value.

231629

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