Abstract
This paper reports three types of electrode materials (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 electrode materials is different and is in decreasing order of stainless steel, copper, and aluminum. To explore how the electrode material 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 electrode materials 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 electrode materials led to the difference in the impulse breakdown voltage of propylene carbonate.
Highlights
The insulating properties of a liquid dielectric are affected by the distribution of the internal electric field.[1,2] The quantity and mode of space charge injection have a great effect on the electric field distribution in the liquid dielectric
This paper reports three types of electrode materials that are used to measure the impulse breakdown voltage of propylene carbonate
This paper explains that the difference in the electric field distortion rate between the three electrode materials led to the difference in the impulse breakdown voltage of propylene carbonate
Summary
The insulating properties of a liquid dielectric are affected by the distribution of the internal electric field.[1,2] The quantity and mode of space charge injection have a great effect on the electric field distribution in the liquid dielectric. Some research institutions measured the distribution of the electric field and space charge in a liquid dielectric with different voltage forms and found that the presence of space charge distorted the initial electric field and had some influence on the insulating properties of the liquid dielectric.[3,4,5,6] The quantity and mode of space charge injection with different electrode materials is different, which affects the initial electric field to a different degree and may lead to the distinction in the insulating properties of the liquid dielectric. Research has shown that there is difference in the AC and impulse breakdown voltage with different electrode materials in the liquid dielectric such as water, liquid nitrogen and transformer oil.[7,8,9]
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