four wire connection in delta system

[pukar12345]

Hi all,

Hi everyone,
I have voltage regulating transformer, 27.6kV/27.6Kv, Delta/ star.

This transformer need to connect in 4 wire system both sides (Supply and load)

I can connect 4 wire to star side of transformer. But in delta side of transformer where I should connect neutral wire?


Thanks all in advance for the reply

 

[dpc]

There's no neutral connection on the delta. Even though the voltages are the same, the secondary side is electrically separate from the primary. This is assuming this is a two-winding transformer.

You may wish to ground the primary side neutral, depending on your system configuration and grounding methods.



David Castor

http://www.cvoes.com

 

[pukar12345]

dpc

Thank you very much for the clue. In which condition we can ground the primary side neutral ? Is there any related links, useful books?

In my case, the Transformer is in substation and has mesh earthing. The primary side is coming from a transformer ( sytar/star with neutral ground) located in a 10 km far substation.

 

[dpc]

That will depend on the type of system (utility, industrial) and the grounding technique being used.

In the US, for a typical utility distribution feeder the neutral is grounded at just about every opportunity. But there are approaches where the neutral is only grounded at the source.

David Castor

http://www.cvoes.com