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  1. entropically

    Class A E VTs

    We've got some older Asea 33kV VTs sitting in storage that I'm considering installing. They're marked Class A E. Anyone got any ideas on what class this would translate to under the modern BS/IEC standards? Thanks.
  2. entropically

    PX CT specification

    For once we've got a project where I get to specify the CTs rather than just making do with whatever is already there. The CTs will supply a low-impedance transformer diff relay and I want to specify class PX so that I can ask for a high enough knee point to avoid saturation as much as...
  3. entropically

    S Class Protection CTs

    I've got a few 1960s/70s 33kV CBs with 15VA S10 CTs fitted. Can anyone tell me how what the 'S10' means? I'm guessing that it refers to a standard in use prior to the introduction ofuse of BS/IEC P class.

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