Simulating Open Delta Connection

[ExcEng]

This is my first post here.
I am working on some project, where the customer PT (sec.) is connected in open Delta. We need to test our system and need to mimic the open delta connection. I am using Omicron to simulate the voltage coming from the PT and can't simulate the open delta (with grounded B phase). The PT is going to UGE modules (Generator voltage modules).

Any ideas how I can do this. What do I need to put between the Omicron and my UGE modules?

Thank you

 

[ExcEng]

I forgot to mention why can't simulate open delta ( I get fault on the omicron).
This is for a static excitation system

 

[LionelHutz]

Use 2 control transformers to create the open delta. Often, the middle leg of the open delta is grounded and if this is your case then you are shorting one of the Omicron output phases.

 

[ExcEng]

Yeah, that what I was thinking.
Thanks. The light bulb lighted after I made the post

 

[pwrengrds]

I use phase A, B and neutral to simulate the open delta connection which reserves the C phase voltage for sync checks, but there are two ways of doing it.

1. Use A,B,N set A phase of the Omicron to 30 degrees and connect to A of the PT connection, Set B phase of the Omicron to 90 degrees and connect to C of the PT connection. Connect N to B phase. This will simulate the delta connection and if your current will be correct for power when A is set to an angle of 0.

2. Use A,B,C at 120 degrees apart. The only trick to this is that the grounded B phase will be be at negative voltage which may or may not work well depending on what else is connected.

David