WHITEPAPER: Digital Fault Recorder Deployment at HVDC Converter Stations

On line continuous monitoring at HVDC Converter Stations is an important asset in determining overall system performance and an essential diagnostic tool when analyzing faults and unexpected behavior. Monitoring the AC supply, the secondary of the power transformers, the filter banks, the DC output, converter station control signals and the protection scheme provides an invaluable set of data showing the interaction of the DC system with disturbances and transients emanating from the AC supply.
Modern Fault Recorders are multi-function devices incorporating power quality measurements to the IEC61000-4-30 standard to class A accuracy. This allows continuous monitoring of the harmonics presented to the AC grid to ensure they remain compliant. Monitoring harmonic levels in the filter banks and secondary side of the power transformer will ensure currents do not exceed rated values.