How do you generate online sag?

Answer 1

A power line's 'sag' is the perpendicular distance between the lowest part of a conductor and an imaginary line drawn between the cross arms of two adjacent poles or towers. Sag varies with temperature, increasing as the temperature increases, due to the expansion of the conductor. Sag is necessary to reduce the strain applied to the conductor and its insulators. Regardless of the amount of sag, the lowest point along the conductor must never fall below the clearance height established for the voltage level of the line. The amount of sag is established by the surveyor/draughtsman responsible for profiling the line, and set by the linesmen erecting the line.