Voltage Summation Method for Determing the Voltage Dependence Ratio Variation of Precise High DC Voltage Dividers

Resently, the uncertainty of voltage ratio of a precise high DC voltage divider is determined by estimating the effects such as high voltage field, leakage currents, corona, temperature, ratio measurement at low voltage. By means of standard arms injection to measure the voltage dependence ratio variation, the uncertainty is hardly at the range of 10 -4 . The DC high voltage summation method is developed for measuring the voltage dependence ratio variation. As a result, for an experamental 500 kV DC voltage divider, the uncertainty is only 1 1×10 -5 .