Electrical breakdown characteristics in non-uniform electrode system with bakelite barrier under the lightning ımpulse voltage

Analysis of breakdown mechanism based on contact area and field enhancement factor of different electrode‐material combinations

“…There are many experimental and simulation studies in the literature that examines the effectiveness of barrier systems according to electric field non-uniformity, barrier shape, barrier location and ambient conditions. [12][13][14][15][16][17][18] According to the studies which investigate the influence of the barriers on different electric field structures, the dielectric barriers are more effective in the electrode systems with high non-uniformity, as they modulate the field distribution and increase the breakdown voltage of the system significantly. 13,15,18 Several studies have been conducted to investigate the effect of electrode structure on the breakdown performance of solid insulating materials.…”

“…The simplified expression of non-uniform electric fields as a function of applied voltage, specimen thickness and electrode curvature radius is shown in Equation (14).…”

“…Also, the breakdown strength of a gas‐insulated gap can be increased by inserting solid dielectric barriers between high voltage and ground electrodes. There are many experimental and simulation studies in the literature that examines the effectiveness of barrier systems according to electric field non‐uniformity, barrier shape, barrier location and ambient conditions 12‐18 . According to the studies which investigate the influence of the barriers on different electric field structures, the dielectric barriers are more effective in the electrode systems with high non‐uniformity, as they modulate the field distribution and increase the breakdown voltage of the system significantly 13,15,18 …”