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Three phase

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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?

 

image.thumb.jpeg.92790b0ad640e12315e9e62082094241.jpeg

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.

"I don't want to know why you can't. I want to know how you can!"

Just to confuse you. This is also a single-phase transformer.
 
A-SWER-Customer-Transformer.png&key=aae56174930ea7263b5af90924aec283ecb523eefc9a10853e5d02112ba6c33f
 

If your not confused already it’s also a SWER


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

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 120o 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).

 

"I don't want to know why you can't. I want to know how you can!"

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