It is commonly accepted in power distribution circles that large (large substation-sized or larger — smaller substation-class transformers are much more readily replaceable) distribution transformers are vulnerable to overheating due to geomagnetically induced currents (say from a solar storm or EMP event). This damage appears to be largely heat-related insulation damage, though, and not something that renders the copper in the windings or the iron in the core unsalvageable though. Given that, would it be possible to restore some functionality to a transformer put out of operation by geomagnetic current overheating by:
- Draining and disassembling the transformer on-site
- Unwinding the existing windings and removing the damaged insulation materials
- Rewinding the windings using the existing copper and fresh insulation materials
- Reassembling and refilling the transformer
, or is this not feasible/possible to do to restore some functionality? I'm not expecting a field rewind to be 100% as it won't be a shop-quality job, but wouldn't it allow limited service to be restored more quickly than having the transformer "dead" until a replacement can arrive, months or years from the event happening?