On Wed, 1 May 2013 22:03:48 -0700 (PDT), harry
wrote:

Changing tappings on transformers does not help with any load changes.

Yes it does. It's the primary means of voltage control on the UK distribution
networks. It is one of the key parts of demand reduction to control stability on
the grid during an unexpected loss of generation.

BTW, I worked for years in an EB and never came a cross a local
transformer that changed tappings automatically. You'll have to
explain how that works.
None of the transformers round here do.

It happens at the bulk supply points. Usually at the first point on the network
where the voltage drops below 132kV.


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