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  • Users: Harry choi
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  1. Harry choi

    Ground fault trip device will be disabled.

    This is choi from Korea. I’m electrical engineer. Our client want to eliminate ground fault function in low voltage zone. TR : 6.6/0.38kV TR 2nd 3 phase short circuit current : 52kA TR 2nd Line to ground fault current : 51kA calculated by etap. Grounding system : TN-S —— ACB and MCCB have trip...
  2. Harry choi

    I have a basic question about IEEE...!

    I heard that 'special color book' in IEEE For example, IEEE 242 is buffer book, IEEE Std 142 is Green book. I don't know why this book is named by color. Because of 'Important'...?
  3. Harry choi

    Generator short circuit calculation

    I simulate 6.6kV generator's short circuit calculation in ETAP. Generator capacity is 3,900kW and rated voltage is 6.6kV. When I simulate SC, SC is just 2.7kA. I know that Short circuit calculation use the X''d If generator has small X''d, is that right generator's SC is small like this?

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