Directly High-Voltage Measuring System Based on Pockels Effect

摘要

To measure high voltage up to $pm$ 450 kV in the dc to GHz range, a new optical high-voltage measuring system using a Pockels crystal in a longitudinal modulation arrangement is developed. The maximum measurable voltage for conventional Pockels sensors has been limited by the half-wavelength voltage $V_{pi}$. In the new system, a two-wavelength dual laser system is introduced to expand measurable voltage up to the least common multiple of $V_{pi}$ for each light. The measured results for dc, ac, lightning impulse, and step voltages by the system are presented and compared with the predicted values.