- Location
- Placerville, CA, USA

- Occupation
- Retired PV System Designer

Well, for a start, consider that the word phase, in a delta, can be used either in terms of the phase wires (A, B, C) or in terms of the phase voltage seen by the load (AB, BC, CA).How is the return path provided incase of DELTA system?there are only 3 phases.so how is return path provided if we have a 3ph load for delta system.

The source for current between two phase wires will be the single coil joining those two wires in parallel with the series combination of the other two coils (which, naturally enough, produces the exact same voltage.) So one phase wire is the source and the other the return at any given moment for that line-to-line phase.

Just in case somebody gets concerned about what happens when you consider all three phases at once, the law of superposition tells us that we can consider the delta to be the equivalent of three separate single phase setups just sharing the same three wires, so there is no need to be concerned about "current flowing in both directions at the same time".