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Distribution Systems: Primary Circuits

Primary Circuits
Primary circuits are the distribution circuits that carry power from substations to local load areas. They are also called express feeders or distribution main feeders. The distribution feeder bay routes power from the substation to the distribution primary feeder circuits.

In the photo of the distribution main feeder the primary circuit is fed underground to a nearby distribution system overhead line. The yellow cables are the primary feeder lines going underground.


Figure 1. 3phase distribution feeder bay
Figure 1. 3phase distribution feeder bay

Figure 2. Distribution main feeder
Figure 2. Distribution main feeder
Figure 3. Overhead primary feeder
Figure 3. Overhead primary feeder
Figure 4. Distribution primary feeder underbuild
Figure 4. Distribution primary feeder underbuild

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