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My lecture notes about distribution systems/radial schemes say the following:

•In this scheme, feeders radiate from a substation in all directions and feed distributors at one end only.

• SA is the feeder which feeds the distributor BC at its end B.

The lecture includes the following picture of a radial scheme:

enter image description here

Question: How does this form a complete circuit ? Put differently, the service lines are not part of a circuit as far as I can see.

AKR
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Amr
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2 Answers2

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You are looking at a single-line diagram. Each of those feeders is actually a three-phase AC transmission line.

We draw three-phase circuits as single lines to simplify the drawing, because drawing three parallel lines for every single feeder clutters up the drawing and doesn't convey any extra information.

Li-aung Yip
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I found the single-line diagram of distribution networks very confusing, and this detailed diagram of IEEE-1992-13Bus clarifies everything.

https://mathworks.com/help/physmod/sps/examples/ieee-13-node-test-feeder.html

Compared to its single-line diagram:

enter image description here

Edward
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