Daily Timewaster wrote a post on Pacific Gas and Electric's plan to intentionally black out regions when high winds are predicted.
PG&E was quoted as saying "... a transmission line that snapped in windy weather probably started last year’s Camp Fire..."
I have seen various electrical failure modes in my life. They are usually of short duration as limit switches and fuses kicked in.
The power signature of a snapped transmission line would not be an overload but a sudden under-load. The thermal profile would be metal arcing high overhead where there is little risk of it igniting a fire, then the hot wire falling to the ground and shorting. The most likely breaking point would be where the wire hangs from the insulator on the pole.
Do power transmission transformers kick-out when there is a sudden loss of current or gross imbalance in current between the two output sides of the transformer?
The other question I have is, do you see more snapped power poles or snapped transmission lines?