Electrical Commissioning In Industrial Power Systems
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At first the blackout — which struck shortly after 11 a.m. July 26 when lightning knocked down a service pole at a generating plant in the city's north end — was expected to last four hours. By the time service was finally restored to all customers at 5:30 a.m this morning, it had lasted nearly 19.
What caused the fifteen hour discrepancy?
At first, Hydro One didn't know where to get the replacement pole.
"A 90-foot pole is pretty unusual and we don't use them in very many places," said Peter Gregg, spokesperson for Hydro One, adding that most poles are in the range of 25 to 30 feet.
For the first while, officials believed they would have to fly in a replacement. Finally, one was located in Milton and trucked in.
But that wasn't the reason for the big delay. Rather, it was what they found when they started to dig.
"The pole got there pretty quickly, but the difficulty we ran into was that the site (near the Leslie St. spit) had a lot of debris. It was unclaimed land and when we started drilling, we hit steel beams."
As the afternoon passed, Hydro officials kept moving back the estimated time required for the repair. At first, 3 p.m. was suggested. At 4 p.m., officials floated 7 p.m. and then midnight.
But it wasn't until midnight that Hydro One got the pole into the hole, nearly 12 hours after the lightning snapped the original pole.
Power was not fully restored until 5:39 a.m.
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