Effect of the electrode material on the breakdown voltage and space charge distribution of propylene carbonate under impulse voltage

摘要

This paper reports three types of electrodematerials(copper,aluminum, and stainless steel) that are used to measure the impulse breakdown voltage of propylene carbonate. The breakdown voltage of propylene carbonate with these electrodematerials is different and is in decreasing order of stainless steel, copper, and aluminum. To explore how the electrodematerial affects the insulating properties of the liquid dielectric, the electric field distribution and space charge distribution of propylene carbonate under impulse voltage with the three electrodematerials are measured on the basis of a Kerr electro-optic test. The space charge injection ability is highest for aluminum, followed by copper, and then the stainless steel electrodes. Furthermore, the electric field distortion rate decreased in the order of the aluminum,copper, and then the stainless steel electrode. This paper explains that the difference in the electric field distortion rate between the three electrodematerials led to the difference in the impulse breakdown voltage of propylene carbonate.