Chris Game wrote:

Wanderer said:

A system transformer failure ay Hurst in Kent, followed some 7
seconds later by a fault on a 275kv underground cable between
their New Cross and Wimbledon substations.

Apparently two unrelated faults seven seconds apart. Stretching
coincidence a bit far don't you think?

Not really. The system may be designed to tolerate either fault in
isolation, but both together cause a failure.

You don't know how many times similar problems have occurred in the
past, but gone unnoticed because there was no impact on customers.


Matthew.