To measure high voltage up to ± 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 voltageVπ. In the new system, a two-wavelength dual laser system is introduced to expand measurable voltage up to the least common multiple ofVπfor each light. The measured results for dc, ac, lightning impulse, and step voltages by the system are presented and compared with the predicted values.
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Kumada et al. (2013) studied this question.
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