Subfeeders
Subfeeders are electrical distribution lines that branch from a main feeder to supply transformers or local feeders, forming the next level of a power distribution network after a substation. They carry medium-voltage power from a primary feeder to distribution transformers or to a defined group of customers within a geographic area. In typical utility practice, a subfeeder serves a subset of customers fed by one or more transformers and may be configured radially or as part of a looped network to improve reliability.
Subfeeders play a key role in fault isolation and protection. If a fault occurs on a subfeeder,
Construction and operation commonly involve medium-voltage lines, often in the range of a few to tens of
Terminology and planning context vary by utility. Some references use “secondary feeder” or “tap line” for related