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  • Users: Meinkaun
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  1. Meinkaun

    Resistvity-Zone of Measurement

    Jghrist, I noticed a lot of contribution from you on grounding issues on this forum and thanks for responding to my question. A word of advise from a GURU like you would go a long way. What I understood from your response is that The uniformity in terms of depth only matters up to Zone of...
  2. Meinkaun

    Resistvity-Zone of Measurement

    Hi,... I am using ETAP for grounding grid simulation. Very shortly, we are arranging for the resistivity tests and I have done some reading to understand these IEEE approved methods. Most of the commercially available softwares including ETAP, SKM, WinIGS have two options: 1) Two Layer Model...
  3. Meinkaun

    Inrush current based on XFMR rating

    Hi,... I am working on a basic feeder protection involving a new 10/12.5 MVA ONFA 69/13.8 KV transformer. The %Z of transformer is 6.4%. I am using ETAP for simulation. Now, When I have to input the value of inrush current, the typical value is 12 times I(full load current). Now what I am...
  4. Meinkaun

    High and Low Gr. System

    Thanks david beach. when you said rated line to line, Does that means MCOV should be line to line or rating of L.A should be line to line? I beleive rating of L.A is different from MCOV. Thanks
  5. Meinkaun

    High and Low Gr. System

    Grateful Cuky2000. The debate is some what related actually. selection of a L.A. based on high resistance or low resistance grounding system. My system is 44 Kv/13.8 KV star grounded 159 ohms I(Gf)50A there is a pole line of approx. 1 km from the sec. of transformer 13.8 KV. what would be your...
  6. Meinkaun

    High and Low Gr. System

    Hi, I am sure many have answered this before: Is this thubm rule or there is a logic behind this assumption: 1. Low resistance grounded system: 0-25 A 2. High resistance grounded system-25-600 A Will it be correct to say, if I limit my ground fault current to 50 A, it will be a High...

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