Calculation of DC line-induced potential in the same corridor under different working conditions

When multiple lines are installed in the same corridor, high amplitude induced voltage may be generated between the lines, posing a danger to equipment and personal safety. Especially for high-voltage DC lines, when one circuit is in live operation and the other is in standby or maintenance status, a high induced potential will occur when the wire is not grounded. On the one hand, it will affect the insulation coordination and protection setting of the DC system. On the other hand, it will also affect the ion current and synthetic electric field on the ground. This article studies the calculation method of the induced potential of DC lines installed in the same corridor under different working conditions, establishes a calculation model for operating lines under different voltage conditions, and calculates and analyzes the influence of factors such as induced voltage, operating mode, and mutual spacing of DC lines installed in the same corridor.