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Please consider adding the following topic if there is time during the Workshops at 2008 CDEGS User Group Meeting.
On a recent field trip to our latest SVC installed at Allegheny Power's Black Oak 500/138KV EHV Substation (see article interviewing ABB at http://www.fortnightly.com/pubs/02012008_TheBigBuild.pdf) to study it for our next planned SVC, I learned that there are different methods used for the ground grid due to the large reactors installed there. We were told that the grid is sort of a radial layout like spokes of a wheel. And that all metallic objects were not grounded as in a typical transmission substation; there were limited grounds in selected locations on things like fences. This was due to circulating currents. This was done by ABB our consultant so there was no one there that could really explain the grounding system in detail.
My suggestion is to discuss at an introductory level the theory and techniques involved and any special considerations required in the grounding of an SVC facility.
Thank you,
Bob Slebodnik
Sr. Engineer, EHV Engineering
Allegheny Power TRAILCo.
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