Sensonics has completed the
retrofitting of two static
digital excitation systems at
Cruachan power station in
Scotland.

Sensonics worked with
Optimised Systems and
Solutions (OSyS) to replicate
the equipment fitted to unit
1 and unit 2 during previous
works.

The new system was
designed to offer high
availability by using separate
and diverse digital controller
hardware in combination
with dual thyristor bridges
providing 100% full
redundancy. These are all
backed up by duplicate
power supplies and
independent protective trips.

A power system stabiliser was
also included in the software
algorithm to ensure Grid
Code compliance.

For units 3 and 4,
Sensonics provided the same
OSyS equipment
configuration which were
fitted to units 1 and 2 in
2002.

Sensonics managed the
entire project on a turnkey
basis in terms of mechanical
design, manufacture, factory
testing and installation,
through to commissioning
the entire system in
conjunction with the OSyS
engineers.