VSL 1200 kV Reference Measuring System for Lightning Impulse Voltage Calibrations

VSL has developed a new reference measuring system with rated voltage of 1200 kV for on-site calibration of lightning impulse voltage up to 3000 kV. The new measurement standard was compared with reference measuring systems from other national metrology institutes in a special comparison campaign. Based on the results of the campaign, calibration and measurement capabilities were realized in testing voltage ( ), front time ( ) and time-to-half value ( ) with uncertainties of 0.7 %, 3.0 % and 1.5 % respectively up to 600 kV and 1.2 %, 5.0 % and 3.0 % respectively up to 1200 kV. Together with additional linearity experiments, VSL is now able to provide lightning impulse voltage calibrations up to 3000 kV on-site. This reference system has been used for the calibration and further tuning of a 4000 kV damped capacitive voltage divider from the Delft University of Technology to improve its voltage and time parameters measurement accuracy.