PCCA Journal 1st Quarter 2014 - page 31

PCCA Journal|1
st
Quarter 2014
31
T
he first environmentally friendly transformer
in the 420 kV capacity range from Siemens
has been commissioned by the Baden-Wuert-
temberg power grid operator TransnetBW. The
world’s first power transformer insulated and
cooled using vegetable oil links the 380 kV extra-high voltage
level with the 110 kV grid of the subordinate distribution grid
operator in the Bruchsal substation. This ensures that the
power transported via the extra-high voltage lines to Bruchsal
is fed into the 110 kV grids of the distribution system operator
and that this power arrives safely and reliably at households
and industry throughout the region.
The special feature of this transformer is the material that
it is filled with. This marks the first time that vegetable oil
is used with this voltage category instead of mineral oil for
insulation and cooling. This vegetable oil is not only more
environmentally friendly, but is also much less flammable
than mineral oil.
“The use of this groundwater-neutral and bio-degradable
insulating oil with its high level of environmental compatibil-
ity was the decisive factor for us choosing this transformer,”
said Michael Schäfer, head of systems technology at Transnet-
BW. The insulating oil for this new transformer is produced
solely from renewable, plant resources and is completely
biodegradable.
This is but one of Siemens’ decisive contributions to envi-
ronmental sustainability. The new power transformer for the
Bruchsal-Kändelweg substation is the world’s first trans-
former at the 420 kV extra-high voltage level for which no
water hazard classification must be issued. As a result, this
transformer can be installed and operated in water conserva-
tion areas or in zones subject to strin gent environmental
protection restrictions.
“The properties of this vegetable oil are not only benefi-
cial to the environment, but also offer the customer cost
Continued on page 32
Siemens Delivers Vegetable Oil Transformer
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