300 MVA EHV (extra high voltage) bank of mobile
resilience transformers for emergency response installed in 30 hours
Installation record proves plug and play transformers
cuts down replacement time from months to days
Siemens and Con
Edison of New York, Inc. have successfully installed an innovative and
versatile plug and play mobile resilience power transformer in record
time. While it usually takes several weeks to transport and install a new
power transformer on-site, the team completed transformer positioning and final
installation in only 30 hours.
is a matter that is very important for us as well as our customers – and in the
end, also for society,” said Dr. Beatrix Natter, CEO of Siemens Transformers.
“The fast-track installation time of our innovative plug and play mobile
resilience transformers is proof that our grid resilience concept is a real
first aid kit for emergency situations.”
resilience transformers were developed together with Con Edison as a part of
the Siemens Pretact® concept for maximum grid resiliency. Siemens delivered the
mobile resilience transformers late last year that will act as an emergency
measure in case of unplanned outages – like those caused by hurricanes – or for
were designed as single-phase units to be as compact and lightweight as
possible. For ease and quick installation, they are transported fluid filled
(transport weight of 216,000 lbs includes fluid) and equipped with plug and
play bushings and cable connections. The insulation fluid is ester, a synthetic
fluid derived from natural oils, instead of mineral oil, reducing the fire and
explosion risk as well as mitigating possible environmental threats.
Additionally, ester allows for operation at higher temperatures, which reduces
the unit’s size and weight. To be able to quickly connect the transformers to
different substations, they are designed in a versatile way and have
connections for several voltage levels (345 kV, 138 kV or 69 kV) and the
secondary connection may be made via bushing to an overhead bus or via a plug
in cable connection.
The assembly and
installation of the units was performed by three teams who were supported by
representatives from Siemens, Pfisterer & MR Reinhausen. The teams
disconnected the existing transformer from the station overhead bus and
installed transformer bushings and surge arresters, set up the pothead stands
and secondary cable connections, mounted and connected the common control
cabinet and set up the control cable connections between the transformers and
the relay house.
For easy storage
and fast deployment all accessories are containerized and allow for maximum
flexibility of setup depending on the specific location where the transformers
are needed. For example, the 138 kV connections to the bus were at a
distance of 150-220 feet from the units, but the easy to install cables and
pothead stands nevertheless allowed for a connection within just a few hours.
Distances up to 400 feet can be managed because of cable extension sockets that
are provided with the units. Even the common control cabinet can be placed over
150 feet away from the units and still be connected with all three transformers
within less than two hours. After installation, the commissioning team tested
the transformers and connections to the relay building, which marked the final
step of the fastest 300 MVA EHV transformer installation in history.
concept of Siemens Transformers combines several modules that assist
transformer operators in preventing transformer failures by dedicated service
measures, protecting transformers from harm like by natural disasters, and the
innovative mobile resilience transformers that offer a backup for unplanned
outages, just in case all other precautions fail, and support the coverage
during planned outages as well.
For further information on the Siemens Pretact® concept
for transformers, please see www.siemens.com/pretact.