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Recent content by StarDeltaPower

  1. StarDeltaPower

    SEF Relay

    Thanks for the pointers. It's actually an SBEF really. I'll ensure that it is set to trip around 0.25s after when the LV and HV relays are expected to trip, and in turn trip both relays.
  2. StarDeltaPower

    SEF Relay

    I have a 1500kVA 11/0.415kV transformer, which has LV earth protection and upstream 11kV protection. The grading is at about 0.25s between the 2 curves under a fault on the LV side of the transformer. I have been asked to add an SEF relay to the LV side protection. Normally I would grade this...
  3. StarDeltaPower

    LV Restricted Earth Fault settings

    Hi all, I've got to do some REF settings for a 23MVA 66/11kV Dyn11 transformer with a 650A NER, with 1200/1A CTs on each phase and star point, and an ABB RET620 relay. I can find a million articles and guides on how to define high impedance REF values and resistors, but nothing on defining low...
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