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Hear the difference –
Siemens Low Noise Transformers
Fit for the future
In every power supply network,
transformers are strategic nodes.
At their location, acoustic environmental protection has now, more
than ever, become crucially important. Limited space in cities and
strict noise control regulations
­require extra efforts, when building power transformers.
Siemens has answered this challenge for over half a decade and
achieved the best results in reducing transformer noise emission.
Areas of use
In acoustically sensitive urban
­locations, particular noise control
regulations apply. Siemens low
noise transformers are suitable
for installation:
•In urban, metropolitan and other
areas of high population density
•In sound sensitive areas
•In places where stringent noise
regulations apply
For Siemens, the reduction of
­acoustic pollution is also a matter
of principle.
Siemens turns down the volume with high power low noise
transformers:
Siemens low noise transformer history
Since 2004, Siemens has successfully
­designed, produced and tested low noise
transformers. In terms of their range and
variety, no other transformer manufacturer can compete with Siemens. These
Siemens transformers comply with one
of the hardest to reach noise and load
noise requirements: the New York City
M1-R Noise Performance Requirements:
Passing the New York City M1-R Noise
Performance Requirements
(2004–2005) and the new, even stricter
requirements (from 2007):
• 2004: 65 MVA transformer
from Siemens Nuremberg
• 2004: 65 MVA transformer
from Siemens Linz
• 2005: 420 MVA autotransformer
from Siemens Weiz
• 2007: 234 MVA phase shifting
transformer from Siemens Weiz
• 2007: 234 MVA autotransformer
from Siemens Weiz
• 2008: 93 MVA transformer
from Siemens Linz
• 2009: 234 MVA autotransformer
from Weiz & Nuremberg
• 2010: 420 MVA autotransformer
from Siemens Weiz
• 2010: 2 x 234 MVA autotransformers
from Siemens Weiz
• 2013: 234 MVA autotransformers
from Siemens Weiz
• 2013: 2 x 300 MVA phase shifting
transformer from Siemens Weiz
Low noise transformers –
Made in Austria
Siemens Transformers is a central figure
with its special skills in low noise issues.
Here, Siemens designed and produced
more low noise transformers then
­anywhere else:
• 2005: 4 units • 2006: 6 units
• 2007: 9 units • 2008: 8 units
• 2009: 7 units • 2010: 8 units
• 2011: 7 units • 2012: 10 units
• 2013: 18 units.
The constant advancements and dynamic
performance of Siemens Transformers
keeps its leading position in an everchanging transformer market.
All aforementioned noise requirements
were reached, even up to 420 MVA, and
Siemens is ready to meet any future
specifications.
The leader in compact low noise
transformer design
Since noise reduction is always a matter
of space, Siemens low noise transformers
feature the world’s most compact design.
While other manufacturers build enormous
noise protection housings, Siemens low
noise transformers are chosen for their
compact design which includes internal
and external noise reducing arrangements that help save floor space at full
low noise quality.
Answers for energy.
Reducing transformer noise
The load noise emitted by energized
transformers consists of no-load noise,
load current induced noise and cooling
equipment noise. The reduction of core
vibration, a classic noise source, is a major
task in low noise transformer design.
DC‑magnetization must be considered
to avoid amplification of core vibration.
The biggest challenge was the development of a calculation method for load
current noise as the understanding of
load current effects is the basis for noise
cancellation activities. Consistent research
in these methods as well as material
properties, has made Siemens’ low noise
transformers a great success to. Calculation models relating to magnetic forces,
magnetostriction and, in particular,
­dynamic mechanical models, were the
breakthrough innovation to gain the
­desired noise reduction. The figures below show the impressive results achieved
by Siemens low noise transformers.
Lowest noise worldwide
Up to 700 MVA and rising, no transformer
competitor can beat the results of Siemens’
ongoing research and development in
building transformers with the lowest
noise emissions worldwide. The list below
shows some examples from the broad
­variety of the successful Siemens Low
Noise Transformers in an outstanding
MVA range, of any transformer type, and
over a period of more than half a decade.
Low noise masterpiece
The power transformer shown on the
left is – at present – Siemens’ low noise
masterpiece. At a rated power of 420 MVA
this low noise autotransformer designed
in 2010 emits a sound pressure level of
merely 52.4 dB(A) at full load. A standard
design version of this transformer emits
76.3 dB(A). This shows that low noise
­design cuts noise emission by 23.9 dB(A)
which is perceived four times as quiet
as a standard design transformer by the
human ear.
Standard transformer design
vs. low noise transformer design / 420 MVA / sound pressure
Condition
Standard
design
[dB(A)]
Low noise
design
[dB(A)]
Noise
reduction
[dB(A)]
no-load
100% Urated
65.5
46.5
–19.0
cooler
fans, pumps
74.5
39.2
–35.3
load current
100% Irated
TOTAL
70.3
76.3
51.1
–19.2
52.4
–23.9
Siemens low noise transformers – references
Rated
power
MVA
183
Sound pressure level
at full load
[dB(A)]
100% Urated + 100% Irated
53.7
Transformer type
transformer
234
49.1
autotransformer
234
49.8
phase shifting transformer
242
51.1
transformer
300
53.4
transformer
300
420
500
575
700
53.7
52.4
55.2
58.9
50.0
phase shifting transformer
autotransformer
autotransformer
phase shifting transformer
phase shifting transformer
Year
Units
produced
2013
6
2007–2009
2013
2007
2010
2009
2011
2005
2007
2009
2011
2013
2005
2010
2008
2006
2006
6
4
5
6
2
6
2
1
1
Note: For the human ear 56 dB(A) sound pressure level is comparable with a domestic refrigerator.
Sound intensity measurement method is 2–4 dB(A) below sound pressure method.
Published by and copyright © 2014:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens AG
Energy Sector
Power Transmission Division
Transformers
Katzwanger Strasse 150
90461 Nuremberg, Germany
www.siemens.com/energy
Power Transmission Division
Printed in Germany
Dispo 19200, c4bs No. 7480
TH 101-140117 XX 472581 DB 0314X.X
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