Secleting aluminum and stainless steel as electrode materials

we investigated the influence of electrode materials on the insulation characteristics of transformer oil. Then

we tested the switching and lighting impulse breakdown voltages of transformer oil between the electrode materials. Furthermore

we built an interrelated space charge measurement platform to measure the distribution of electric field and space charge in transformer oil between the two electrode materials. The test results show that the electrode material remarkably affects the impulse breakdown voltage of transformer oil. The switching and lighting impulse breakdown voltage between stainless steel electrode is much higher than that of aluminum electrode. The space charge injection quantity of aluminum electrode in transformer oil is more than that of stainless steel electrode when applied by switching impulse voltage. Thus

the electric field in transformer oil between stainless steel electrodes is more uniform than that between aluminum electrodes. By analyzing the effect of electrode material on the impulse breakdown voltage of transformer oil in the view of space charge

we believe that the difference in space charge injection ability of electrode material will lead to the different degree of electric field distortion in transformer oil that causes the difference in impulse breakdown voltage.