What Happens In A Substation During The Replacement Of A High-voltage Disconnect Switch?

When performing hv isolator switch replacement work on large substation facilities, the relevant 220kV busbars are typically not maintained in a normally energized state. This is an abnormal operating mode set up for maintenance operations. During the entire high voltage electrical isolator replacement process, the substation operation dispatch adjusts the connection topology, switching the power transmission path of the affected section from the original standard operating mode to a specific standby or maintenance mode. Using bypass lines and other isolator high voltage equipment, the busbar section is disconnected and isolated, allowing the replacement work to be carried out in an electrically disconnected state. This arrangement stems from industry-standard considerations and professional operational practices regarding the safety requirements of primary equipment operation.