The two papers listed were obtained from the on-line Transco library (now National Grid) and are all available for public inspection
They are the reports of two completely separate major failures of the 400kV 'supergrid' supply that occurred in 2003 and are a classic example of how several small incidents can cascade to a major problem.
Note the similaries between each event:
London 28 August 2003 - This was the widely publicised event that knocked out the Tube at rush hour and left commuters stranded
Hams Hall 5 Sept 2003 - Less well-known, similar set of causes just a few days later
The National Grid Co. site gives access to many interesting papers on electricity generation and bulk distribution. Look particularly at the "Key Documents" section.
- Equipment out of commission for regular servicing
- A failure that would normally have passed without incident
- A fault that remained unnoticed until it was triggered by other events