SilverArc
Electrical
- Sep 20, 2006
- 82
Hi Everybody,
I had sneaked in an earlier post"Grounding in Rocky areas" and Jghrist was kind enough to answer my question there about the potential variation shown by dotted lines in fig. 1 found in the link below:
Hi Jghrist,
Thanks for these valuable comments. We dont have any body at our work, who has even a figment of imagination about grounding. So, I try to work out concepts on my own or some times people in this forum are kind enough to advise me.
After reading through explanation,
"The potential shown by the dashed lines is not the potential beneath the earth. This is the surface potential as it varies along a line on the surface and it is shown below the surface for convenience"
we have a uniform copper mesh below the substation, where an equal amount of current will flow, So The potential should be same also ?
I thought through it and came up with explanation. The variation in potential on the grid its self is depending on the fault happens. Is this the reason ?
Q# Why do we say the "Mesh potential"(the potential in the centre of the grid) is always maximum.
Q# Eventually to give more practical shape to my dilemna, I did a simulation in ETAP and came across the plot below for touch profile.
Could you please explain me, what are these red circles at different places. What do they highlight. I though a lot about it but could not get it.
Thanks.
I had sneaked in an earlier post"Grounding in Rocky areas" and Jghrist was kind enough to answer my question there about the potential variation shown by dotted lines in fig. 1 found in the link below:
Hi Jghrist,
Thanks for these valuable comments. We dont have any body at our work, who has even a figment of imagination about grounding. So, I try to work out concepts on my own or some times people in this forum are kind enough to advise me.
After reading through explanation,
"The potential shown by the dashed lines is not the potential beneath the earth. This is the surface potential as it varies along a line on the surface and it is shown below the surface for convenience"
we have a uniform copper mesh below the substation, where an equal amount of current will flow, So The potential should be same also ?
I thought through it and came up with explanation. The variation in potential on the grid its self is depending on the fault happens. Is this the reason ?
Q# Why do we say the "Mesh potential"(the potential in the centre of the grid) is always maximum.
Q# Eventually to give more practical shape to my dilemna, I did a simulation in ETAP and came across the plot below for touch profile.
Could you please explain me, what are these red circles at different places. What do they highlight. I though a lot about it but could not get it.
Thanks.