Operating duty test of surge arresters for HVDC transmission systems

An operating duty test of a high-voltage (64 kV) dc arrester was performed in the field. The results obtained were compared with those of a laboratory test on a prorated section of thec same arrester (8 kV). This comparison demonstrated the validity of the equivalent prorated test method. In another operating duty test conducted under the severe condition of deblocking with full rectifier voltage against an open inverter end, the operating capabilities of a prorated section were demonstrated.