Two DNO 11Kv/400/230v transformers on different HV lines originally supplied two separate buildings on an industrial site. The two separate buildings are now one large steel framed one. So we have two DNO intakes and no clear demarcation within the installation. I remember reading somewhere about issues arising in such situations but cannot find the article. I am keen to establish if any issues are serious enough to seek alternatives. One of the intakes has a Biomass plant feed-in with g59 relay. Both intakes are circa 1MVA.
On the odd occasion where I've come across this before, usually the DNO baulk at the idea of two supplies into one building (demise) and cite earthing as their reasoning. As long as both the star points, one from each transformer, are solidly bonded together so there is one Earth potential, I don't really see the issue. Have you spoken to the DNO?
As you have multiple supplies by the sound of it via the biomass plant, I guess there is already labelling regards safe isolation etc but that might also need revisiting based on having another TX supply in the single building.
On the odd occasion where I've come across this before, usually the DNO baulk at the idea of two supplies into one building (demise) and cite earthing as their reasoning. As long as both the star points, one from each transformer, are solidly bonded together so there is one Earth potential, I don't really see the issue. Have you spoken to the DNO?
As you have multiple supplies by the sound of it via the biomass plant, I guess there is already labelling regards safe isolation etc but that might also need revisiting based on having another TX supply in the single building.
