What happens to lines flowing towards a station when a line flowing towards it is lost?

When a line flowing towards a station is lost, the lines that remain operational will increase their flow to compensate for the loss. This phenomenon occurs due to the principles of power system operation, where the overall load demand must still be met.

In a transmission system, all lines have specific capacities, and they work together to transport electricity to a substation or load center. When one line is taken offline or experiences a failure, the electric current that was flowing through that line must be redistributed among the remaining operational lines. This redistribution often leads to an increase in the load on those operational lines as they take on the additional current to maintain balance in the system.

The system's automatic controls and protection mechanisms adjust the flows accordingly, ensuring that the demand continues to be met, assuming that the remaining lines have sufficient capacity to handle the increased load. Thus, the correct understanding of system behavior in response to a line loss is that the flow on the remaining lines towards the station will indeed increase.