Observation of AC surface discharge on insulating film by Pockelseffect

摘要

In order to design the insulation of high-voltage equipment, it isnecessary to develop a measurement method for understanding the timedependence of AC (50 Hz) surface discharge on an insulating material.The authors have developed a method by which one can obtain the surfacecharge pattern and density by means of an electrooptic Pockels effect inBSO (Bi₁₂SiO₂₀) crystal. They have improved theoptical system to obtain the time dependence of the AC (50 Hz) surfacedischarge pattern and density on an insulating film. The observed ACcharge distribution on a PET film surface is reported. The relationshipbetween needle-film gap size and residual surface charge pattern isdiscussed