A CHARGE SIMULATION-BASED METHOD FOR CALCULATING CORONA LOSS ON AC POWER TRANSMISSION-LINES

This paper presents a method to calculate the corona power loss and th e ground level electric field values for single- and three-phase power transmission lines. The charge simulation technique is applied in whi ch the surface charge on the stressed conductor(s) as well as the spac e charges around each conductor are represented by a discrete set of u nknown infinite line charges. Satisfying the properly chosen boundary conditions at the transmission line conductors results in a system of linear algebraic equations whose solution evaluates the unknown line c harges. The emission of ions from a conductor surface is assumed to ta ke place when the magnitude of the charge simulating its surface charg e exceeds an onset value based on the predetermined onset field values for both positive and negative half cycles. The simulation space line charges are displaced back and forth to the conductor by the action o f the electric field whose magnitude and direction depends on the simu lation charges in the conductor and in the surrounding space. Recombin ation process takes place whenever charges of opposite polarities meet together. The calculated corona power loss for single- and three-phas e power transmission lines agreed satisfactorily with those reported e arlier.