Round-robin test on repetitive PD inception voltage of twisted-pairs

Six laboratories in Japan have performed round-robin test (RRT) on measurement of repetitive PD inception voltage (RPDIV) under well-controlled experimental condition. They used common twisted-pair sample, common impulse generator and common data sheet with normalized air pressure and temperature. Scatterings of data were small except in relative humidity. Stability of PD occurrences against repetitive impulses was investigated using all record of PD data stored in PC. This paper reports the test procedures and the results of the RRT for RPDIV measurement.