I've never seen 139 VAC to ground anywhere or 220/127V, for that matter. I thought utilities don't like to go lower than 0.95 PU (per-unit)? Don't 2 or 3 pole pigs make up your 3-phase Delta? Also, why would you divide 240VAC by the sqrt(3) to get 139V, when from the high leg to ground you would get 208V to ground?
