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'Catastrophic failure' that led to Heathrow power outage revealed
A power outage that shut Heathrow Airport earlier this year, causing travel chaos for more than 270,000 passengers, was caused by a "catastrophic failure" of equipment in a nearby substation, according to a new report.
Experts say the fire at the North Hyde Substation, which supplies electricity to Heathrow, started following the failure of a high-voltage electrical insulator known as a bushing, before spreading. The failure was "most likely" caused by moisture entering the equipment, according to the report.
National Grid, which owns the substation, missed two opportunities to prevent the failure, experts found, the first in 2018 when a higher-than-expected level of moisture was found in oil samples. Such a reading meant "an imminent fault and that the bushing should be replaced.
Amir Nisi
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