According to "World Energy Outlook 2020", power generation using renewable energy resources is expected to grow rapidly over the next decades ...
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SUSTAINABILITY According to "World Energy Outlook 2020", power generation using renewable energy resources is expected to grow rapidly over the next decades ABSTRACT Power transmission plays a crucial role in the future energy transition. Siemens Energy recognises trends in energy transition with sustainable power transmission, thus started developing technologies that are actively shaping the path to a cli- mate-friendly future. Siemens Energy offers transformers and components for best-in-class renewables integra- tion while keeping the transmission grid reliable and resilient. KEYWORDS climate-friendly, eco-friendly, energy transition, power transmission, sus- tainability 116 TRANSFORMERS MAGAZINE | Volume 8, Issue 2 | 2021
Advertorial
Shaping
the energy
transition with
sustainable
power
transmission
The energy transition is a
tremendous global task
T
he Paris Agreement, a legally Power transmission plays
binding international treaty on a crucial role in the energy
climate change, was adopted by transition
196 parties end of 2015 and en-
tered into force on 4 November 2016. It In their annual report “World Energy
was agreed to limit global warming to Outlook 2020,” the International Energy
well below 2 °C, preferably to 1.5 °C, Agency (IEA) draws alternative scenar-
compared to pre-industrial levels. ios of the future energy landscape. The
However, the newest UN emission re- COVID-19 pandemic has caused an
port, published end of 2020, stated that ongoing huge disruption to the energy
the world is on course for more than sector, and there is a wide range of en-
a 3 °C spike, even if climate commit- ergy future scenarios. According to the
ments are met. In order to limit global outlook, global energy demand might
warming, all countries worldwide need rebound to its pre-crisis level in early
to rapidly reduce global greenhouse 2023, or even later, depending on when
gas emissions as fast as possible. About the pandemic is brought under control,
42 % of global CO2 emissions in 2018 and it is still unclear how much efforts
accrued in electricity and heat pro- countries and companies will put in in-
duction (source: IEA in 2018). For the creasing the sustainability of the energy
necessary energy transition, not only system. However, the outlook at all the
do governments have a special respon- scenarios shows that power generation
sibility in creating the right framework using renewable energy resources is
conditions but also the energy sector expected to grow rapidly over the next
has a central role in actively shaping decades, with solar and wind expecting
the path to a climate-friendly future by the highest growth in global electricity
providing necessary technologies. generation.
w w w . t ra n sfo r m e r s - m a g a z i n e . co m 117
SUSTAINABILITY
Siemens Energy offers two technologies of mission grids will be further extended
by implementing a lot more high-voltage
step-up transformers, especially for wind direct current (HVDC) systems, AC- and
applications: fire resistant GEAFOL® trans- DC-offshore grids, and extended AC- and
DC-onshore grid connections. Siemens
formers up to 40.5 kV and FITformer® WIND Energy’s portfolio already comprises most
of the relevant elements and is continu-
transformers up to 66 kV ously expanded through innovation.
To integrate renewable energy sources
into the transmission grid, the generat-
The IEA points out that the backbone future – in a sustainable, affordable and ed electricity needs to be converted to
of today’s power systems, the electricity reliable manner. the requisite voltage level by a step-up
grids, might develop as the weak link transformer. Siemens Energy offers two
in the energy transformation. Even in technologies of step-up transformers,
Siemens Energy offers trans
the Stated Policies Scenario, without specially designed for wind applica-
any additional efforts than already an- formers and components for best- tions: fire resistant GEAFOL® cast-resin
nounced to increase the sustainability in-class renewables integration transformers of up to 40.5 kilovolts (kV)
of the energy system, IEA sees an 80 % while keeping the transmission and FITformer® WIND transformers
increased demand for transmission grid reliable and resilient of up to 66 kV, with ester, a flame-re-
and distribution grid expansion in the tardant, and biodegradable insulating
next decade compared to the previous Undoubtedly, the society needs a massive fluid. Both types are compact, environ-
decade. Companies like Siemens Ener- expansion of renewable energies to com- mentally friendly, and extremely reliable.
gy recognised early that energy trans- bat climate change while also meeting the
mission and distribution would be one global energy demand. However, the in- The increasing use of renewable energy
major key to a successful energy trans- creased integration of fluctuating resourc- sources does not only lead to growing grid
formation, thus also started early to es also poses new challenges to the grid complexity but also to increasing power
develop technologies that are actively resulting in a higher demand for certain fluctuations. Shunt reactors are used for
shaping the path to a climate-friendly transmission technologies. Power trans- voltage control and reactive power com-
FITformer® WIND in the nacelle of an offshore wind turbine
118 TRANSFORMERS MAGAZINE | Volume 8, Issue 2 | 2021
Siemens Energy offers various products to cope with the increasing power fluctuations caused by the increasing infeed of renewable energy Variable shunt reactor pensation. They continuously adjust reac- tor power rating to actual needs. Variable shunt reactors by Siemens Energy are not only designed as compact units for ongo- ing adjustment to changes in grid condi- tions but are also low-maintenance units with minimal service demands. To reduce energy loss from long cables and extended grids, the voltage level should be maintained on the desired lev- el. This can be done by means of voltage regulators. These tapped autotransform- ers are a highly reliable solution for sta- bilising voltage fluctuation in the grid. Siemens Energy voltage regulators come in 1-phase or 3-phase models. Different cooling systems are available, and the reg- ulators can be applied to any electrical sys- tem to improve voltage quality. In an increasingly complex power gen- eration landscape and a growing energy market, the capability to control the flow of power is gaining crucial importance. This is the area where phase-shifting Voltage regulator w w w . t ra n sfo r m e r s - m a g a z i n e . co m 119
SUSTAINABILITY
Both Sensgear® and Sensformer® can be system, a solution for control and protec-
tion of power grids. The collected data of
enhanced with a digital twin feature, which Sensproducts® are analysed by expert al-
simulates the asset performance nearly gorithms offering enhanced substation re-
liability and increased asset productivity.
in real-time, offering temporary overloads
Both Sensgear® and Sensformer® can
without compromising on lifetime be enhanced with a digital twin feature,
which virtually simulates the physical
asset’s performance nearly in real-time
to increase productivity and availability,
transformers are implemented into AC chronous grids. Siemens Energy offers a offering temporary overloads without
grids. They protect lines, make grids more comprehensive portfolio of fit-to-purpose compromising on lifetime. This innova-
reliable, reduce transmission losses and HVDC systems and necessary equip- tion acts as a facilitator for operators and
thus contribute to the reduction of CO2 ment, e.g., highly reliable and tailored-to- managers, as it provides a life consump-
emissions. Phase-shifting transform- fit HVDC transformers and bushings. tion view of the assets and a full tempera-
ers are among the most economical and ture view of the transformer. In addition,
cost-efficient solutions for power-flow Another essential lever in transmission the digitalisation of assets enables preven-
management while avoiding expensive efficiency is grid management – there, tive detection of critical situations such
grid extensions. intelligent digital information systems act as gas and oil leakages, thereby avoiding
as a real accelerator. In 2020, Siemens En-
ergy launched Sensproducts® as a conse-
Siemens Energy supports
quent evolution of Sensformer®, digitally
grid operators to increase enabled transformers, and Sensgear® dig-
transmission efficiency itally enabled switchgear products. Sen-
sproducts® combine status information
Siemens Energy has been working hard to of Sensformer® and Sensgear® and form
improve the efficiency of its products over an agile system intelligence platform for
the last decades. Great progress was made, supporting system operators to manage
and to date, large power transformers grids and substations most efficiently. All
have peak efficiencies above 99.5 %. Mini- assets of a high-voltage substation trans-
mum energy efficiency requirements have mit data to a highly secure cloud-based
even been defined by authorities (e.g., Eco platform that offers a near real-time in-
design regulation (EU) No. 548/2014). formation channel parallel to the SCADA
(supervisory control and data acquisition)
For transmitting a large amount of power
over long distances, HVDC technology
offers the most efficient means. The solu-
tion can also be used to connect asyn-
Phase-shifting transformer
120 TRANSFORMERS MAGAZINE | Volume 8, Issue 2 | 2021
HDVC transformer
unplanned outages and emissions to the tion to an environmentally conscious and
environment. greenhouse gas-reduced power transmis-
sion.
Siemens Energy goes beyond
For centuries, power and distribution
product standards for a transformers have been filled with min-
greener future eral oil for electrical insulation and cool-
ing. However, if there is any leakage, it
Another step towards a greener power can be harmful to the environment and
grid is reduction of hazardous and pollut- in combination with sparks and oxygen,
ing materials within existing transmission easily combustible. Siemens Energy has
equipment. In the past years, manufac- been a leading transformer manufacturer
turers like Siemens Energy came up with using natural or synthetic esters instead
various alternatives that foster the transi- of mineral oil. These biodegradable ester
fluids are environmentally friendly, which
makes them the first choice for places
where high environmental standards are
required, such as offshore wind platforms.
Besides, ester fluids are extremely fire-safe
due to high flame and flashpoint values
and today also meet cold temperature en-
vironment specifications.
In 2020, Trench, a Siemens Energy
subsidiary, launched the first ester-im-
pregnated transformer bushings. These
bushings are filled with synthetic ester
as an insulating liquid, which ultimately
w w w . t ra n sfo r m e r s - m a g a z i n e . co m 121
SUSTAINABILITY
Transformer filled with eco-friendly ester oil
improves the aging resistance of the es- are biodegradable and thereby safe for chanical, and thermal characteristics and
ter bushing portfolio and can prevent the environment. have also proven to be particularly com-
several well-known failure modes of patible with the environment. With epoxy
conventional oil-impregnated bushings. Another sustainable product is the dry- resin insulation instead of a liquid insula-
Besides, they can mitigate the fire risk type transformer. The Siemens Energy tor, the GEAFOL® transformers are flame
and have an improved thermal class al- GEAFOL® cast-resin distribution trans- resistant and self-extinguishing. They are
lowing many options for overload oper- formers exceed the highest safety stan- also completely recyclable.
ation. Both natural and synthetic esters dards. They have excellent electrical, me-
SF6, the most popular gas to insulate in-
strument transformers, is a very potent
greenhouse gas, with a global warming
potential of 22,800 times that of CO2
over a 100-year period. Trench, a Siemens
Energy subsidiary, is one step ahead and
has introduced the world’s first instru-
ment transformers up to 420 kV with zero
global warming potential during opera-
tion. These instrument transformers use
clean air as an insulation medium – this is
not only environmentally friendly and re-
ducing the CO2 footprint, but also makes
the products maintenance-free and suit-
able for low-temperature applications at
-50 °C and below.
In 2020 Siemens Energy launched Pretact
EcoSafeTTM - the world’s first concept of a
fire-safe and explosion-proof substation.
Trench products: blue instrument transformer w/o SF6 gas and ester-impregnated It sets new standards in environment,
transformer bushings health, and safety to achieve a reliable fire-
122 TRANSFORMERS MAGAZINE | Volume 8, Issue 2 | 2021
safe solution for the entire substation and
all its products. Owing to its modular con-
cept, customers can choose from different
performance levels and features to adjust
the products to specific environmental
and safety needs.
The success of the energy
transition depends on
forward-thinking transmission
OEMs – like Siemens Energy
Energy transmission and distribution play
a key role in a successful energy transition.
Companies like Siemens Energy are ex-
panding their transmission technologies
and portfolio with high-efficient products
that go beyond currently valid standards
and enable the integration of renewables
by innovative products for securing grid
stability. At the same time, digitalisation is
implemented to support smarter and more
efficient utilisation of existing resources.
With Sensformer® and Sensgear®, Siemens
Energy is a pioneer in this area and is ex-
tending the portfolio rapidly.
The energy transition is a global task and
demands the commitment of every indi- GEAFOL® cast-resin distribution transformer
vidual. At the same time, everybody prof-
its from it – individuals, societies, but also
economies. The necessary technologies In 2020 Siemens Energy launched Pretact
are already available or are proactively in
development. Now it is up to all of us to
EcoSafeTTM - the world’s first concept of a
speed up the implementation! fire-safe and explosion-proof substation
Pretact EcoSafeTTM concept
w w w . t ra n sfo r m e r s - m a g a z i n e . co m 123
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