Another I'm ashamed I have forgotten post.

[Pete999]

When Phasing out a 400v 3 phase supply and you test between (RYB ) times so please forgive the inaccuracy, R on one side and R on the other you would expect to see 0 volts on your approved voltage tester.
Why is it that when you do the same test on an HV (11kV) Supply and you go between R to R you see approximately 50% of the 11kV ? Like I said something only encountered once or twice and for the life of me I can't recall.

 

[Toneyz]

Just a completely wild guess anything to do with one being star and the other Delta probably talking out of my backside on this one Pete.

 

[Pete999]

Just a completely wild guess anything to do with one being star and the other Delta probably talking out of my backside on this one Pete.

Not sure Mate, mind keeps running this around far to befuddled to think about it now to be honest, but thanks for the input, it is a possibility though, never gave that idea much thought, it was just something I had forgotten, and you know that can ruin your day.

 

[Toneyz]

Might help if you draw it out.

 

[StephenRowley]

We don't do phasing on our HV kit at work but college we where always told it, Phase to Phase should have zero volts even at medium voltages.

 

[Deleted member 26818]

Is it because the two conductors are from different transformers that are out of sync?

 

[StephenRowley]

Is it because the two conductors are from different transformers that are out of sync?

auto transformer will produce a 180degree phase shift but you would just shift your phases over to maintain the correct phase alignment.