Very nice report on the fire at North Hyde substation which took down Heathrow in March.
tl;dr:
* Fire was caused by moisture ingress in a high voltage bushing which was detected in 2018 but got lost in the system.
* North Hyde is an ageing substation which didn't have adequate protection against spread of fire
* Heathrow didn't think that a loss of grid feed was a plausible risk, so they assumed 10-12 hours was a reasonable recovery time from that.
Russ Garrett
in reply to Russ Garrett • • •Also missed that Heathrow published their own report last week:
heathrow.com/latest-news/kelly…
Nico
in reply to Russ Garrett • • •Heathrow: Power can fail? *surprised pikachu*
Steve Scott
in reply to Russ Garrett • • •I don't think I can get away with reading a 77 page document while at work, but the highlights certainly look interesting. One for later!
Certainly interesting that the suppliers don't necessarily know that there is CNI hanging off a particular substation