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  1. Electoman

    1-Ph Test Sets

    I am looking for a single phase test set to test high burden electromechanical relays. I've used the T1000 (ISA) and Multi-Amp, but because they are just modern variacs, the waveform distortion is so much that timing tests are not accurate anymore. For the other relays (e.g. Digital types), we...
  2. Electoman

    RIO Files

    Thanks, Aakhrinaam. I ended up doing the RIO File myself last week. You are right about learning more in the process. I wanted something to compare it to, but the test results obviously speak for itself. Happy, testing...
  3. Electoman

    RIO Files

    I forgot to add, this RIO file is to test the Transformer Differential function using the Omicron Test Set.
  4. Electoman

    RIO Files

    Does anyone know where I can find RIO (Relay Interface by OMICRON) files on the internet? I am specifically looking for the RIO file for a GE Multilin T60 transformer protection relay. SEL, Siemens and ABB have these files available, but I cannot find any for the new (UR Family) GE relays...
  5. Electoman

    Zero Sequence fault currents

    [thumbsup]Thanks guys, You helped me a lot. Much appreciated.
  6. Electoman

    Zero Sequence fault currents

    Guys, thanks for your replies so far. Let me try to give more information. I am testing a T60 (GE Multilin TX relay). GE provide a TX Diff calculation Excel sheet to help calculate the diff and restraint currents. They advise to unground the star points in the TX to test the pick-ups on a per...
  7. Electoman

    Zero Sequence fault currents

    Could anybody please explain the following: I am interested in the current distribution of a single-phase to ground fault on a YY transformer with both neutrals earthed. The PRAG explains that the currents for a A-E fault will be Ia=(2C1 + C0)I0, Ib= Ic= -(C1-C0)I0, where C0 and C1 are zero and...

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