Voltages in Disconnected Overhead Transmission Line, Induced by Electric and Magnetic Field of Operated Transmission Line

The paper proposes the algorithm for calculation of voltages in phases and wire of parallel disconnected overhead transmission line induced by electric and magnetic field of operating in coordinated load mode overhead transmission line. Two single-circuit 220 kV lines were taken as the studied ones. Disconnected line protected phase and part length in which this phase should be protected (1 km) are selected. This section is grounded by the ends to line towers. Disconnected line all other phases and lightning wires are grounded to one tower inside the protected area. Electric field effects determine by capacitive currents in grounding phases, wires, grounding devices and in the ground. Magnetic field effects determine by current in the circuit of protected phase and the generated in phases and wires part grounded by one side s longitudinal electromotive force. Equations for voltage distribution over the ground along each phase and wire in the protected and non-protected areas finding are compiled according to electric and magnetic impact schemes. Resulting voltage distribution along each part determine by received voltages electrical and magnetic components adding.