We have already determined the neutral problem is the fault of the POCO, but it has to be happening somehow on the primary side because many transformers are involved.
The Neutral has to be established at the secondary center- tap of the transformer. Maybe they bought a bunch of transformers with crappy center tap posts. We got a run of bad aux transformers in our newer substations. Most of them blew in the first 2 years.
I've wasted too much time trying to dream up a useful design that could counter the evil lifted neutral. It would have to have a 2 pole breaker almost as big as the main itself and be capable of huge current draw shifts between the legs to neutral. I don't see it as ever being a practical gizmo to install in a residence. i could see designing into a device where you could power a load from the hottest leg or phase combo.
Joe
