36 - Voith Hydro

As the unit has to be integrated in
the existing structures of the power
house, design of the turbine and
generator held some challenges.
Just to give an example: the draft
tube diffuser of the unit had been
built in the 1980s, when the plant
was commissioned. Thus, certain
main dimensions and hydraulic
boundary conditions for the turbine
design were heavily constrained
or even fixed by existing structures.
Moreover, the existing powerhouse
crane is only able to lift up
to 1,000 tons which sets a weight
limit to the turbine and generator.
The impressive diameters of these
components are 7.1 meters (turbine)
and 13.9 meters (generator
stator core diameter), respectively.
After the tests in Heidenheim, the
École Polytechnique Fédérale de
Lausanne in Switzerland, which
maintains one of the rare indepen-
May 2008 I 17 I HyPower
dent testing laboratories for
hydraulic machines in the world,
cross-checked the test results
Voith Siemens Hydro produced in
its facilities. The successful result:
BC Hydro asked Voith Siemens
Hydro to proceed.
BC Hydro is studying the option
to add yet another Francis unit
for Revelstoke and two additional
units for Mica, a plant approximately
100 kilometers further north, in
order to meet the growing demand
in Canada’s Western Province of
British Columbia.
Revelstoke hydro power station has
an installed capacity of 1,840 MW
with provisions for an ultimate
capacity of around 2,864 MW.
To date, the powerhouse has four
large generating units in service
since 1984. Each unit has a capacity
of 460 MW.
Project Info
Voith Siemens Hydro Montreal was awarded
a contract by BC Hydro for supplying a new
512 MW-Francis turbine and a 532 MVAgenerator
for Unit No. 5 for Revelstoke in
October 2006. Its commissioning is targeted
for October 2010. The contract value is
48 million Euros.
Author
Pierre Séguin
Head of Marketing,
Montreal, Canada
Pierre.Seguin@vs-hydro.com
CANADA
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