Corona simulation by the Popkov/Sarma models involve the Deutsch approximation of the invariance of the electric field direction. The paper implements the models to obtain current density and field profiles at the collector electrode for positive corona in wire-plane, paraxial-cylinder and point-plane gaps in air. The simulations are compared with experimental data and are found to give satisfactory agreement. Consideration is given to reasons why the Deutsch approximation yields low errors.
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