Tent B1: Increased availability
and more flexible operation through
modernization of turbine hydraulic system
Reference – Turbine Controls
Instrumentation, Controls & Electrical
SPPA-R3000 Turbine Controls
offers the perfect solution for the modernization
of control system and hydraulics for the turbines,
and restores Unit B1 of the Nikola Tesla B power
plant to optimal operational readiness.
The Result
■ Increased availability
and security of operation
by virtue of proven,
modern components
■ Improved flexibility and
greater precision in turbine
control through individual
valve actuation
■ Lower maintenance costs
as a result of the reduced
number of system
components
■ Safeguarding the unit's
lifetime due to modern
and reliable I&C technology
The Plant
The Termoelektrana Nikola Tesla B (Tent B)
lignite power plant lies on the Sava River,
upstream from Belgrade, and is operated by
Elektroprivreda Srbije (EPS). Its two power plant
units B1 and B2 are the country's largest, producing a total output of 1,240 MW. This equates
to around 1/5 of Serbia's electricity demand.
As one of the nation's largest power generation
facilities, the thermal power plant is of the
utmost importance to Serbian electricity supply.
The Task
After many years of operation, the BBC/Alstom
turbine in Unit B1 was showing signs of wear
and tear and spare parts were no longer obtainable. The increasing risk of unplanned plant
shutdowns due to an obsolete control system
prompted EPS to look for a concept to extend
the unit's lifetime and to modernize the turbine
hydraulics. The requirement was for a modernization solution that was perfectly to the situation
at the power plant and ensured reliable and
flexible operation of the plant. EPS again attached
great importance to finding an experienced and
reliable local partner, with proven technology
capable of both enhancing the plant's availability
and reducing maintenance costs.
Our Solution
During a planned 185-day plant shutdown
of Tent B1, Siemens carried out a modernization
of the turbine control and protection systems
of the 620 MW BBC/Alstom turbine, the lowpressure bypass stations, and the Boiler Feed
Pump Turbine (BFPT). SPPA-R3000 Turbine
Controls was implemented. SPPA-R3000 is the
perfect solution, with comprehensive automation
functions for gas and steam turbines from any
vendor, and is fully integrated into the unit's DCS.
In order to enable higher flexibility of operation
in the future and to prevent unplanned plant
shutdowns, in addition to the control technology,
worn-out and obsolete turbine hydraulics
components were also modernized. To improve
the control functionality of the input valves,
Siemens upgraded the adjustment drives of the
BBC/Alstom turbine. Through the use of new
control and automation devices, it is now
possible to individually actuate each turbine
valve, independently of the others. This has
resulted in improved flexibility and greater
precision in turbine control. The old unreliable
mechanical/hydraulic 2-channel protection
system was replaced with an electronic failsafe
3-channel protection system. All of the old
mechanical protection devices were removed,
and a new TÜV certificated IEC 61805
SIL 3 compliant 2-out-of-3 turbine trip block
was installed along with new field sensors
for recording protection criteria. Overall,
the number of system components was
reduced significantly. In conjunction with
the new SPPA-R3000 Turbine Controls,
the BBC/Alstom turbine can now be operated
flexibly and safely.
“Due to the modernization
of obsolete hydraulic we can
now run our turbines more
flexibly, once again using
them for reliable and efficient
operation of the plant.”
Vladimir Obradovic, Project Manager
EPS Srbija
siemens.com/sppa
Published by and copyright © 2014:
Siemens AG
Power and Gas Division
Freyeslebenstrasse 1
91058 Erlangen, Germany
For more information contact
sppa-r3000.energy@siemens.com
www.siemens.com/energy/sppa-r3000
Siemens Energy, Inc.
Instrumentation, Controls, & Electrical
1345 Ridgeland Parkway, Suite 116
Alpharetta, GA 30004, USA
R3MOST_FR_TurbHydr-TentB1-Serbia_e_V1-0
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