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The following algorithm may work:

loop0:

For every busx in the subsystem of interest:

if bus is type 2, continue #skip generator bus
count the number of buses it is connected to      #<- this is a loop
only if busx is connected to one bus, add to list those branches containing busx, then extrude such busx.
increase +1 single_bus counter

go back to loop0 until there is no more busx connected to one bus (single_bus counter=0).

The following algorithm may work:

loop0:

For every busx in the subsystem of interest:

if bus is type 2, continue #skip generator bus
count the number of buses it is connected to      #<- this is a loop
only if busx is connected to one bus, add to list those branches containing busx, then extrude such busx.
increase +1 single_bus counter

go back to loop0 until there is no more busx connected to one bus (single_bus counter=0).

The following algorithm may work:

loop0:

For every busx in the subsystem of interest:

if bus is type 2, continue #skip generator bus
count the number of buses it is connected to      #<- this is a loop
only if busx is connected to one bus, add to list those branches containing busx, then extrude such busx.
increase +1 single_bus counter

go back to loop0 until there is no more busx connected to one bus (single_bus counter=0).

8/24: I re-wrote rimux's code since it did not work in v.32.C:\fakepath\radial1.gifv.32. - click on I posted the link, select the pic icon and rigth-click to download it, rename its extension to .py and run it after loading savnw case. code at my googledrive site (https://drive.google.com/drive/folders/0B7uS9L2Woq_7YzYzcGhXT2VQYXc) filename = brnradial.py. This version does not bypass radial generators, connected to the grid with a transformer.