Three phase

[janclaes47]

I always read on the forum that the high voltage lines are 3 phase, so I guess there must be a neutral somewhere also.

 

In front of my house runs a 3 wire high voltage line, of which 2 of the wires are connected to my single phase transformer.

 

When 2 wires are connected I assume that one is the live wire and the other the neutral, so that would mean that the high voltage lines at my location only have 2 phases.

 

Is that correct?

 

[Crossy]

No. The HV supply is delta connected, 3-phase, 3-wire (no neutral).

 

The transformer that drops it to 220V 3-phase, 4-wire is a delta/star configuration.

 

Your transformer is connected between two HV phases.

[Crossy]

Just to confuse you. This is also a single-phase transformer.

 

 

[Wirejerker]

Just to confuse you. This is also a single-phase transformer.
 

 

If your not confused already it’s also a SWER


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[janclaes47]

So where does the transformer get the neutral from, as I thought there always has to be a return.

[Crossy]

20 minutes ago, janclaes47 said:

So where does the transformer get the neutral from, as I thought there always has to be a return.

This isn't really the place to go in to 3-phase theory.

 

Put simply, the neutral current is the phasor addition of the line currents (which are displaced by 120^o each), if the system is balanced this result is zero. With a neutral current of zero there is no need for a wire so it's left out (saves 25% on cable cost).