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**Chris** · 10-08-2019, 08:04

The Grid’s automatic protection against a drop in frequency is to cut power to one or more of the distribution networks connected to it. This is what caused such widespread disruption. Within any given distribution area, critical systems might have continued to function if they were equipped with a working backup power supply.

There are no reports of either of the main Scottish distribution networks being severed from the Grid last night, so I’d say traffic light failures in Glasgow were a coincidence, unconnected to the general failure at National Grid.

10-08-2019, 08:04	#39
Chris Trollsplatter Cable Forum Team Join Date: Jun 2003 Location: North of Watford Services: Humane elimination of all common Internet pests Posts: 36,929	Re: Major power outage hits the country The Grid’s automatic protection against a drop in frequency is to cut power to one or more of the distribution networks connected to it. This is what caused such widespread disruption. Within any given distribution area, critical systems might have continued to function if they were equipped with a working backup power supply. There are no reports of either of the main Scottish distribution networks being severed from the Grid last night, so I’d say traffic light failures in Glasgow were a coincidence, unconnected to the general failure at National Grid.