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A New Possible Partial Discharge Detection Technique using Electro-optic Effect

In this work, it is proposed new PD(partial discharge) detection technique using electro-optic effect, for which partial discharges generated from needle-plane electrode in air were detected through optical measuring system by use of $LiNbO3_3$ electro-optic crystal. As a result, it is noticed that PD measurable phase intervals are limited by the asymmetrical D-E hysteresis loop of the crystal with defects and half-wave voltage. However, both number of measured PD pulses and their amplitude were increased with applied voltage, which likely implies that it is possible to detect PD through newly proposed electro-optic method.