This is an amazing read. "When magnetic cores saturate and the field strays outside the core (see my first post), wires and insulation can overheat and in effe

This is an amazing read. "When magnetic cores saturate and the field strays outside the core (see my first post), wires and insulation can overheat and in effect burn. Hot spots manifest not as a flames (one hopes) but as chemical decomposition that forces gaseous byproducts into the oil, which can be monitored. In all of these eight transformers, degradation began right after storm activity and proceeded slowly, so that failure arrived in weeks or months rather than minutes."