Computation of Ionized Environment of Unipolar HVDC Transmission Lines Using Gas Bimolecular Collision Theory
M. Raja Nayak, Koritala Chandra Sekhar · 2024
Corona on HVDC line conductor establishes the ionized current environment in the corridor of the transmission line at ground levels. The ionized ionic current environment of high potential dc lines may be categorized by propagation of the space charges, propagation of the ionic currents and enhanced electrical field distribution in line corridor. This paper presents the solution of the unipolar corona equation i.e. poisson’s equation by the estimation of the generated space charge ion magnitude during the corona discharge using the concept of gas bimolecular collision theory. The concept of gas bimolecular collision theory utilizes the ambient climatic parameter effects on the evaluation of the propagation of the ionized current at ground levels which is major drawback of current computational approach. Multiple experimental studies on DC transmission lines are carried out in the indoor and outdoor laboratory of CPRI on reduced scale down experimental models at various high potential dc supply conditions. To the same experimental model configurations, experimental measurements are compared with the computed results developed by the authors. The calculated corona generated ionic current magnitudes are exactly matched with those measured experimentally for both indoor and outdoor laboratory model measurements.