[3] Resin Insulator with tested Voltage at 6.0 kV
This testing is applied the AC high voltage at 6.0 kV intothe electrode. The gap length of electrode is 10 mm by using resin insulator. Fig. 13, Fig. 14 and Fig. 15 show PD patternof symmetrical shape, semi-symmetrical shape and unsymmetrical, respectively. The PD value is low same as oil because the resin electrode is placed in parallel place. It does not have the area to generate the electric stress.