PT Connection Question

[richanton]

I have a Square D Power Logic system that I wneed to connect PT's into. According to their diagrams, I can set it up as a 2PT,3CT 3 phase delta system.

The PT's I have are unusual(I think) in that they each have 6 leads. In the original circuit they were used in, they were wired such that 2 leads produced each phase voltage. In the Powerlogic System there is only 3 single wire connections and the V2 connection is ground. Has anyone wired a similar transformer in this configuration.

If I did this correctly, I attached a photo of the transformer.

http://files.engineering.com/getfil...78c5-4a5f-8d02-65fa7c7d02c6&file=DSCN0572.JPG

 

[DTR2011]

Hard to say what they are exactly. I would test them with a TTR or other methods to determine what the 6 wires are. Can you look back at the schematics and determine from the wire numbers what each wire is doing?

 

[scottf]

It looks like it's either a single secondary with multiple taps are 2 secondary windings with a tap.

As said above, use a TTR to find the desired ratio and use that.

To be safe though, you really need to verify the ratings and confirm that the VT is rated to be applied line-to-line on whatever voltage circuit you have.

 

[OffTap2020]

Looks like a one secondary, one tertiary winding.

OT