Establishment of DC High Voltage Standard at National Physical Laboratory

Abstract

In the beginning of this millennium National Physical Laboratory, New Delhi has established DC high voltage measurement facility up to 100 kV. It is a unique calibration facility in India. The main theme of this laboratory is to maintain and upgrade DC high voltage standards through continuous research and development. The principle of calibration is based on the comparison method .The ratio of standard divider is 100000/1 0 and uncertainty is 0.01%. The DC High Voltage standard is traceable to primary standard of voltage i.e., Josephson voltage standard with the expanded uncertainty of measurement at k=2.<br> The standard divider and the UUC divider are put in parallel and supplied with a HV source up to 100 kV. The output voltage at the lower end of the standard divider as well as UUC divider are measured with the help of two separate calibrated multimeters. Standard divider ratio is used to define the HV source voltage. In to days' world transmission by means DC high voltage is considered to be the most appropriate. Some of its important properties have been defined in this paper.