No sign of any bird or object causing a fault, but there indeed was a lot of heat. These 100 kva 227/480 volt transformers can push a good amount of load But why didn’t the fuse blow when this “fault” occur? Weird?!?
Sometimes you can only guess what happened. Often I wish I was standing there to watch it happen. Instead I show up after the fact and replace the transformer and now the farmer can get to watering again.