Calculation of Inductive Voltage and Current for 500 kV Double Circuits Transmission Lines on Single Tower

Coupling between phase lines is strong in 500 kV double circuits on single tower. There are higher inductive voltages and inductive currents on the non-energized lines while another line is energized. On the basis of theoretical analysis, inductive voltage and inductive current are calculated by the EMTP programme. According to simulation results, conclusion can be drawn as follows: both electromagnetic inductive current and electromagnetic inductive current are directly proportional to power which is transmitted on energized line; both electromagnetic inductive voltage and electrostatic inductive current are directly proportional to length of transmission lines; Electrostatic inductive current has no connection with power which is transmitted in energized line; Electrostatic inductive voltage has no connection with power and length. Current on earth lines has no connection with location of earth lines. Transposed lines can not reduce inductive voltage over non-energized lines, but can reduce inductive current on non-energized lines greatly.