Interlaboratory comparison of high direct voltage resistor dividers

A 150-kV divider from the National Measurements Laboratory of Australia was used as a travelling standard in comparison tests against standard dividers maintained at the Korean Research Institute of Standards and Science and the National Research Council of Canada. Results are presented in terms of the relative ratio changes between these dividers and the transfer standard under high voltages. In addition to establishing the relative agreement in high direct voltage measurements, the comparison tests were shown to be especially valuable for evaluating the ratio drifts of the dividers under prolonged application of high voltage.