We inject 5 Amp from termination of current transformers on prp to MKV. we find the values (4.8, 4.8, 3.8) A. We swap phase a , phase c the problem transferred.

Then we try to change (PTBA , TCEB , ribbon cable JV). After each change make measuring, we didn't find change in the value -change (TCCB board) the value become 4.3 A.

The question is we change all things on the direction of signal from PRP to MKV where the problem? why the phase C is lower?

Thanks,
GSA

 

First, what is prp (PRP)?

Second, I don't see where you've tried directly connecting your current injection to the Mark V PTBA terminal board. Have you done that? Or only from the "prp" through the interconnecting wiring?

Third, when you say you swapped A and C, did you do that by reconnecting the field wiring at the PTBA? Wouldn't that point to some problem with the field wiring?

Have you meggared the field wiring between the PTBA and the "prp"?

 

GSA... what is generator's voltage and MVA?

Phil Corso