Behavior of the corona current in coaxial systems with negative corona under controlled pressure conditions

This paper studies the behavior of the corona effect in dry air and coaxial configuration for different pressure values. The study is conducted in a system of four parallel-connected coaxial cylinders placed inside a controlled pressure chamber. During the tests, DC current is measured through the coaxial system for various pressure values when a voltage, higher than the corona onset, is applied; then, a mathematical model that describes the behavior of the corona current as a function of pressure and applied voltage is obtained. The mathematical model accurately reproduces the behavior observed during the measurements.