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  1. mabdeltawab

    SOTF calculation

    @cranky108 @Fischstabchen I think the difference between SOTF and normal operation is that SOTF mandates instantaneous trip but normal operation can be instantaneous or based on IDMT is that correct?
  2. mabdeltawab

    Overcurrent relay and inrush current

    Bill it will be installed in RMU operating on around 13kv Regards Mohamed
  3. mabdeltawab

    SOTF calculation

    Usually for Overcurrent relay, we do DFT calculation on current samples to get the 1st Harmonic RMS then use it in further calculation to get the trip time based on either DTL or IEC/ANSI curves. What is the difference between SOTF calculation and normal calculation does the SOTF also based on...
  4. mabdeltawab

    Overcurrent relay and inrush current

    Dear All, I'm electronics engineer working on design on an overcurrent relay as per my understanding, the overcurrent relay calculation is based on fundamental harmonics RMS my questions are:- - Why do we need to care about inrush as long as it affects only 2nd Harmonic which is not used in...

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