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What is HIGHSET differential protection?

  1. May 4, 2013 #1
    I know biased differential protection system. But one differential relay I have at work here has a feature called "Differential instantaneous highset overcurrent protection". Does anyone knows anything about it?
     
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  3. May 4, 2013 #2

    Simon Bridge

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  4. May 4, 2013 #3
    Thanks Simon.
    it appears high-set relays are used for radial feeder protection. I dont see what it has got to do with differential protection of transformer.
     
  5. May 5, 2013 #4

    Simon Bridge

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    Neither do I - but people will call things by whatever name they think will sell.
    You should have a good idea what high-set" means now though.
     
  6. May 5, 2013 #5
    High set just isn't a feature provided by a relay, it is just a method of setting relays. (Relays at the near ends are progressively set at higher pickup current value)
    So how can relays talk of having and not having high-set protection?
    I don't think I fully understand high-set yet.
     
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