In article , Cynic
wrote:
The 11kv ring is rarely closed but run with a deliberate open circuit to
limit fault levels.thus points are fed from one end or the other. If a
section suffers damage or requires operational intervention it can be
switched out and the remainder of the system can continue to operate by
selective switching.

when I worked for SESEB in the early 1960s, 11kV was a real ring

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle