Some grounding materials and parts near a hydro truck
Another view of the transformers. Damaged is on the left, new unit on the right
The box on the old transformer looks heavily damaged while the transformer itself doesn't look too bad
King Street West is shut down from Bay Street to Yonge Street
The vault is in front of the RBC building, just east of the Scotiabank building
The transformer is oil filled and consists of coils of wire wrapped around metal cores. It looks like the cable or connection might have failed and arcing of the high voltage would have caused the explosions. Fire and the arc would melt the plastic insulation of the cables and caused the heavy smoke. If power wasn't cut off immediately due to the fault current then the explosions would continue until power was switched away from the area or the cables degrade enough where they couldn't sustain the current flow. They would probably have to splice or replace some of the cables, put the new transformer into the vault, make the connections and perform switching operations to put the transformer and vault into service. I wouldn't be surprised if the work was done by late tonite or early Wednesday morning. We shall see if Toronto Hydro make public the reason for the equipment failure.
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