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  1. schweiko

    GE SR745 OLTC position correction

    I have to install two GE SR745 Xfmr management relays (main and backup)to protect one transsformer. My transformer is provided with OLTC with one set of resistors indicating the tap position to the protection. The question is if it's possibible to connect this one set of resistors to two SR745.
  2. schweiko

    Absence on zero sequence polarising voltage

    The earth fault protection needs for correct directional discrimination a a minimum Vo voltage. (Typical 50 mV). I see that you have a very high fault resistance (only 500 A fault current). According to your information the "normal" ground fault level should be 400 MVA. This denotes a...

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