Hi 7anoter4,
I have downloaded the file and it has been very helpful.
Hi bacon4life,
The clearance I was referring to here was the Ground Safety Clearance (vertical). I live in PNG and we exclusively use the IEC and AS standards, I have settled on the ground clearance set out in the AS2067 in...
Dear experts,
I hope you can provide some insight with an issue I have.
My organisation is supervising a new substation that will import 50MW via 132kV transmission line and transformerd into 66kV for reticulation to the existing grid.
While reviewing the drawings for the 132kV switchyard, I...
Dear jghrist,
I appreciate your input here. I did not consider the the requirement to calculate the grid resistance, I now see how much of a pain that can be.
Thank you for the commentary on this.
Appreciative,
Yogima
Dear 7anoter4,
Appreciate sincerely your feedback.
I have covered item 1, item 2 and 3 are proving tricky as they refer to resistance calculation of vertical electrodes embedded in concrete.
For my case, am intending to use the rebars or run parallel copper conductor embedded horizontally in...
Dear experts,
I have not come across sufficient information to assist me in designing grounding system for a switchyard control building using IEEEStd80:2013.
I am seeking your expertise to advise me if my thoughts are incorrect?
1. GPR in concrete is different from GPR in soil.
2. a. What is...
Dear jghrist,
Please note in my above reply that the phase-ground fault I was referring to here is not via the pothead or any structure on the 11kV side for that matter as they are all bonded to the earth grid but via a direct phase-ground fault (fallen 11kV line, accidental short circuit via...
Dear jghrist,
Thank you for your comment. My replies to bacon4life and Kiribanda noted that there is a pothead located between the 11kV bushing of the transformer and the 11kV panels in the control building. If there was an accidental phase-ground connection/fault (highly unlikely) of the...
Thank you Bacon4life and Kiribanda,
I note both your comments.
After reading both replies I now believe the consultant designed for 26kA accounting for probable phase ground fault along the short span of overhead 11kV conductor that runs from the transformer's 11kV bushing to a pothead where...
Dear experts,
I have been reading the IEEE Std80:2013 (free version) and have compared it to one of our company's recent projects design files and have noted some issues I hope the experts can shed some light on. For example, the consultant had used the fault levels from the 11kV side to size...
