be installed. The damaged slot section was machined
out to allow the installation of an epoxy glass block
G11, which was machined to restore the stator slot profile to the correct dimensions.
Keith Barbier, Head of International Contracts and
Projects at Sulzer UK, comments: “The re-build process
is a very skilled and time-consuming task because pre-
cision is essential to achieving a high-quality finish. The
engineers worked round the clock to manufacture the
new coils and install them into the stator.”
Prior to the rebuild, the coils were stress tested to
earth in accordance with EN60034-1, tan delta tested
and interturn tested using EA Technical Specification
44-5 as the pass mark. At the same time, the rotor was
refurbished and then reassembled with the completed
stator before the final tests were completed.
After just 30 days the generator was back on site, being craned into position and reinstalled with all the ancillary equipment, before being put back into service.
Projects such as this have highlighted Sulzer as
a leading provider of engineering solutions to the
power generation sector, from on-going condition
monitoring to complete turnkey projects. With a
global network of repair centers capable of completing generator and turbine repairs, Sulzer ensures it
employs experienced engineers, equipped to complete projects on site if necessary.
The engineers worked round the clock to
complete the rebuild of the generator
The refurbishment of the stator included
eplacement of the coil retaining blocks