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  1. 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...
  2. 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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