Wye Wye Transformer Installation??

[blackace15]

I have a 12470V Wye to 480V Wye transformer that I want to use since it is just sitting in storage.

Here is the scenario that I currently have:

• Current transformer is a 7200V Delta to 480V Wye that is fed from an overhead source.
• The overhead line is going to be removed from this locaiton and I have a nearby 12470V source on the primary side of a 12470V Delta to 480V Wye transformer.
• How can I connect the spare 12470V Wye transformer from the primary of the exisitng nearby feed?
• What neutral can I derive in the Wye Wye transformer?
• The Wye Wye transformer has NO H0 bushing but is internally grounded to the X0 bushing and has a switch to engage this connection.

I have attached picutres of the High/Low sides and the nameplate. I hope this is enough information to get an answer.

Thanks for the help!!!

 

[jaylectricity]

I'm not sure. Wye do you ask?

 

[hurk27]

If you look at the diagram in photo 3 you will see that the H0 and X0 are the same bushing.

 

[mbrooke]

I have a 12470V Wye to 480V Wye transformer that I want to use since it is just sitting in storage.

Here is the scenario that I currently have:

• Current transformer is a 7200V Delta to 480V Wye that is fed from an overhead source.
• The overhead line is going to be removed from this locaiton and I have a nearby 12470V source on the primary side of a 12470V Delta to 480V Wye transformer.
• How can I connect the spare 12470V Wye transformer from the primary of the exisitng nearby feed?
• What neutral can I derive in the Wye Wye transformer?
• The Wye Wye transformer has NO H0 bushing but is internally grounded to the X0 bushing and has a switch to engage this connection.

I have attached picutres of the High/Low sides and the nameplate. I hope this is enough information to get an answer.

Thanks for the help!!!

Depending on the grounding of the 12.47kv line it will determine whether or not its possible. Keep in mind a wye wye will pass neutral imbalance on to the primary side. If the secondary has a neutral load you will need a primary neutral that goes all the way back to the substation supply transformer.