Electrical outages. cyber attacks ?

Thanks for the clarifications Alan - they make sense.

 

No loads or generation were lost as a result of the line opening. Losses were as a result of the under-frequency excursion.

I think I was fooled by the statement in the executive summary (I really should stop reading them!) that said (my emphasis) "The lightning strike also initiated the operation of Loss of Mains (LoM) protection on embedded generation in the area and added to the overall power loss experienced."


If embedded generation was lost purely on frequency - which would have been seen equally right across the country - and as far as I can tell only some embedded generation was lost - then I guess it must have been down to slight differences in the trip settings on individual units (or tolerance in each unit's frequency measurement etc). If all units are intended to trip out on similar frequency changes then maybe only a slightly worse frequency situation would have led to a much larger proportion of embedded generation disconnecting - implying we might have been on the knife edge of a far worse situation?

 

The reasons behind the trip of the steam turbine at Little Barford are not currently in the public domain.

I guess you know more than you can say here! - I was just going by their public statement that it was "associated" with the lightning strike.


  - Andy.

Thanks for the clarifications Alan - they make sense.

 

No loads or generation were lost as a result of the line opening. Losses were as a result of the under-frequency excursion.

I think I was fooled by the statement in the executive summary (I really should stop reading them!) that said (my emphasis) "The lightning strike also initiated the operation of Loss of Mains (LoM) protection on embedded generation in the area and added to the overall power loss experienced."


If embedded generation was lost purely on frequency - which would have been seen equally right across the country - and as far as I can tell only some embedded generation was lost - then I guess it must have been down to slight differences in the trip settings on individual units (or tolerance in each unit's frequency measurement etc). If all units are intended to trip out on similar frequency changes then maybe only a slightly worse frequency situation would have led to a much larger proportion of embedded generation disconnecting - implying we might have been on the knife edge of a far worse situation?

 

The reasons behind the trip of the steam turbine at Little Barford are not currently in the public domain.

I guess you know more than you can say here! - I was just going by their public statement that it was "associated" with the lightning strike.


  - Andy.