dynamic voltage restorer - condensator … · 08 oskαr®-cooling system oskαr® powered by...
TRANSCRIPT
OSKαR® setting new standards in power quality.
Voltage dips in the electrical power supply are one of the main reasons for ex-
pensive unscheduled production outages. The voltage range of +-10 % of the
nominal voltage defined in EN 50160 has to be guaranteed by the utility only in
95 % of the 10 minute average values. Incidents which are shorter than 10 minu-
tes cannot be avoided and may not be criticized.
IEC 61000 2-8 describes the impacts of voltage dips. If the remaining voltage is
less than 85 % of the nominal voltage, typically problems with frequency conver-
ters and switch-mode power supplies will occur. According to own investigations
commercially available contactors are in an undefined status if the voltage goes
down to 80% of nominal voltage, even if the voltage dip lasts only for one period
(20 ms).
Also rugged consumers like asynchronous motors will be affected if the voltage
drops to less than 75 % of the nominal voltage for several periods.
OSKαR® keeps the grid vol-
tage highly dynamic at the
desired target value and the
load will ride through typical
voltage dips without even ta-
king notice. Typical voltage
dips will be passed through
brilliantly. Reach a new le-
vel of power quality with
OSKαR®!
OSKαR® ONLINE-SUPPLY-KORRECTION WITH ADAPTIVE REGULATION
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online-supply-korrection with adaptive regulation
DIRECT EFFECTSCircuit breakers of the utilities trip (typical reaction time 100-150 ms)
Local events spread through the mains
Contactors and relays drop off
Measuring devices and sensors detect wrong values
Frequency converters fails
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OSKαR® powered by Condensator Dominit
REASONS FOR VOLTAGE DIPS IN THE MAINS POWER SUPPLY
Short-circuits in the distribution grid
Strikes of lightening
Heavy loads
Big load changes
Switching operations of utilities
Turn on- and turn off of power plants
Instabele energie“production“ (wind-/solar farms) renewables
Birds and bird droppings
Other events
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CONSEQUENCESProduction processes stop
Production quality criteria are violated
Financial losses arise
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online-supply-korrection with adaptive regulation
OSKαR®-GRID-PROTECTION
Realtime voltage correction (< 1 ms)
Circuit power remains nearly unchanged
Voltage dips down to 40 % of the nominal voltage can be corrected
Efficiency > 98 %
Extended operation is possible
Protection against overvoltages
No energy storage needed
Minimal space requirements
Low purchase and maintenance costs
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PRO
PUMV
circuit breaker/fuse
LV
protected loads
PUMV
LV
protected loads
unprotected loads
PUMV
LV
To protect production processes, OSKαR® will
be connected between the supplying transformer
and the load(s). The short circuit power remains
nearly unchanged by adding OSKαR®. All selec-
tivity criteria for fuses and circuit breakers remain
unchanged. OSKαR® can be extended by modu-
les and is therefore sufficient for protecting single
machines as well as complete supply systems.
unprotected loads
OSKαR® is equipped with an online con-
trol which keeps the voltage continuously
at the desired value:
400 V ordered, 400 V delivered!
As soon as OSKαR® detects a difference
between the real voltage and the targed
voltage it starts to adjust with a reaction
time of 140 µs.
The voltage dip is fully corrected in less
than half a cycle.
3 phase voltage dips of up to 40 % and
overvoltages of up to 20 % are corrected.
OSKαR®-FUNCTION PRINCIPLE
incoming line transformer load
Bypass
DC-Bus
AC/DC-rectifier
DC/AC-inverter
DC-Bus
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OSKαR® powered by Condensator Dominit
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online-supply-korrection with adaptive regulation
rectifier-module
inverter-module
bypass-module
transformer cell
SET-UP
OSKαR® is executed as conventio-
nal switchgear where all components
necessary to ensure a perfect voltage
are mounted inside a cubicle. The seri-
al coupling (or injection) transformer is
located encapsulated in the lower sec-
tion of the cubicle and directly fixed on
the base. The power electronic modules
are located in the upper part of the cu-
bicle. The power electronics consist of
three functional units, one rectifier-, one
inverter- and a bypass-module. Further
technical details are described on
page 11.
transformer control
OSKαR® 300 kVA
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OSKαR®-COOLING SYSTEM
OSKαR® powered by Condensator Dominit
A sophisticated ventilation system is im-
plemented in order to remove the losses
during operation (≤ 3 kW) appropriately
out of the cubicle. In the lower section two
powerful fans guarantee a sufficient inco-
ming airflow which is guided directly into
the transformer compartment. This air-
flow is then guided between the backwall
and the segregation wall behind the power
electronic modules directly to the air out-
lets at the roof. Each power electronic mo-
dule has its own fans which blow air from
the middle part of the cubicle through the
modules. The hot air will be dissipated th-
rough the back-wall and ventilation grids
located in the upper part.
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online-supply-korrection with adaptive regulation
BYPASS
In the case of a short circuit on the
load side or under overload conditions
OSKαR® switches into bypass mode.
The Bypass protects the power electro-
nic components of OSKαR®. This also
insures, that the short circuit power on
the load side remains unchanged and
fuses and circuit breakers as well as
other protection equipment operate in
the usual way.
The multiply redundant designed
bypass ensureds, that the maximum
short circuit power is provided when it
is needed.
The short circuit power is an important
quality aspect of every electrical ener-
gy supply system regardless of whether
operation is disrupted or not. Harmonic
currents have a lower impact, the hig-
her the short circuit power is.
With its uk of < 2,5 %, the serial coup-
ling transformer of OSKαR® is dimen-
sioned for a short circuit power of 40
times of its rated power.
u Thyristor switch for bypassing
without any delay
u Bypass contactor for over-
load and short circuit
u Redundant 2nd bypass
contactor for short circuit on
the load side
OSKαR®-MEASURING RESULTS
Theory and practice must not necessarily
deviate from each other. The characteristic
curves taken into account for the OSKαR®
design have been proved in reality.
The achievable correction values of
OSKαR® are shown in the diagrams
for three-phase and single-phase volta-
ge dips. Measured values, monitored in
customer installations, show, that the sta-
ted correctional values are always achie-
ved by the system. The result of the con-
trolled output voltage has a difference to the
target voltage (with load) of about 0,625%.
Such a virtually ideal voltage characteris-
tic can never been seen in a grid without
OSKαR®.
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OSKαR® powered by Condensator Dominit
effective value of load current
effective value of load voltage (output L1)
effective value of load voltage (output L2)
effective value of load voltage (output L3)
effective value of supply voltage (incoming)
TECHNICAL DATA – OSKαR®
System concept
Rated power
Nominal network voltage
Rated frequency
Network configuration
Grid short circuit power
Correction range
Single-phase dips
Three-phase dips
Overload capability
Overload in bypass-mode
Accuracy of the output voltage
Accuracy during voltage dips
Reaction time
Transient time
System efficiency
Communication
Parametrization/Analysis
Degree of protection
Ambient temperature
Dimensions (w x d x h)
Weight
Power connection
Height of connection points
Door hinges
Ordering code
Options
modular
300 kVA*
400 V*
50/60 Hz ± 5 %
3-phase, TN
scalable
40% for 30 s and ± 10% continuously
40 % UN � 100 % (30 s)
60 % UN � 100 % (30 s), 50 % UN �90 % (15 s)
150 % IN (30 s)
20 kA / 150 ms, 40 kA / 10 ms
≤ ± 1 %
± 3 %
140 µs
< 10 ms
> 98 %
Ethernet (RJ45) / FTP-Server / Mail-Server / Modbus
touch panel / Log-SD-Card / Mail
IP 20D*
0 °C (min.), 40 °C (max.)
600 x 800 x 2282 mm (incl. socket)
900 kg
from the bottom
incoming 800 mm, outgoing 370 mm
right
OS 300 - 400 - 40 %
Maintenance bypass for bridging the system,
Measuring device for independent analysis Class A
* Other ratings on request
Subject to changes
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online-supply-korrection with adaptive regulation
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OSKαR® powered by Condensator Dominit
Depending on industrial sector and techno-
logy the costs for voltage dips vary in cha-
racter and height.
u Additional costs for adjustments
u Costs for reset or restart of
machines
u Costs for longer outages of the
production
u Logistic problems in extremely
sequenced production
u Maintenance and repair costs
in cases of damages
According to scientific studies, the
costs for one dip vary from a few thous-
and Euro in simple industrial processes
up to six figure sums in highly sensible
production segments such as semicon-
ductors and pharmaceutical producti-
on.
In general, all high technology pro-
duction lines and almost every process
where the torque and rotation speed of
motors have to be kept stable simulta-
neously are at particular risk.
RELEVANCE
online-supply-korrection with adaptive regulation
Pharmaceutical industry (climatisation)
Medical technology (MRI scanner, intracardiac catheter robots)
Big industrial plants
Coating processes (Voltage dips have a direct impact on the film
thickness, control problems)
Grinding processes (Voltage variations have a direct impact on the
quality of the process accuracy)
Measuring systems (high-precision processes which need a stable supply,
e. g. testing of ABS-systems)
Highly dynamic processes
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CONTACT DETAILS
Condensator Dominit GmbHAn der Bremecke 8 · D-59929 BrilonPhone +49 (0) 2961 782-0Fax +49 (0) 2961 782-36E-Mail [email protected] www.condensator-dominit.de
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online-supply-korrection with adaptive regulation
Condensator Dominit GmbH
An der Bremecke 8
D-59929 Brilon
Phone +49 (0) 2961 - 782-0
Fax +49 (0) 2961 782-36
E-Mail [email protected]
Web www.condensator-dominit.de