Thinking about Marshall Meadows again, (as we drifted into a slightly off topic discussion in the recent thread about the Berwick OHLE damage), I thought it worth asking a question here.
Now we usually refer to “grid supplies” but it seems Marshall Meadows has a pair of 33 kV supplies from the local area substation at Cocklaws. (They’re presumably single phase supplies - Google Streetview clearly shows two independent rows of wooden posts, each carrying one pair of conductors).
View attachment 84727
It is the substation that has the incoming 132 kV supply from the 400 kV grid near Eccles (Borders).
My source of info ”Open Infrastructure Map”:
https://openinframap.org/#2/26/12
View attachment 84726
I read somewhere that there were two aspects to the Marshall Meadows work, strengthening the supply and installing SFCs. The latter are 3 phase devices as we’ve been discussing, so is there an implication that the whole overhead post run from Cocklaws will have to be converted to a 3 phase supply? If so, how would this be done quickly without supply interruption? Could they reconnect at either end and effectively use the same conductors in a 2+1 configuration?