Calculation of Television Interference (TVI) for Unconventional High Surge Impedance Loading (HSIL) Transmission Lines

Television Interference (TVI) is a pivotal factor in high voltage transmission line design. TVI occurs because of corona discharges along the transmission line, causing signal deterioration and power loss. Conventional lines have the bundled conductors symmetrically placed on a circle, and the bundle radius is chosen such that the corona discharge effects are reduced. High Surge Impedance Loading (HSIL) transmission lines consist of a higher number of subconductors and a larger bundle radius, increasing line loadability. Conductor costs are reduced by using subconductors with smaller radii. The novel 500 kV unconventional HSIL line designed in this paper exhibits a potential to enhance the natural power of the line and differ from the conventional HSIL and the conventional lines in having asymmetrical bundled conductor configurations. For this unconventional HSIL line, TVI produced due to corona discharges on and around the line are calculated and compared to the conventional line. As a result of this study, we are taking a step forward toward the development of unconventional HSIL lines for modern power systems that will revolutionize power delivery.