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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...

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...

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...

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

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...

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...