Voltage dips in the electrical power supply are one of the main reasons for expensive 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 minutes 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 converters 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 voltage highly dynamic at the desired target value and the load will ride through typical voltage dips without even taking notice. Typical voltage dips will be passed through brilliantly.

Cost effective solutions deliver optimised supply voltage
Improves efficiency of VFD operated equipment
Has a bypass mode to check efficiency
Payback typically achieved within 30 months
Measureable savings in energy consumption
Operating costs lowered by less failure of IGBT's/Electronic Card etc
Highly efficient as compared to SERVO technology
System concept
System concept
Rated power 300 kVA*
Nominal network voltage 400 V / 480 V / 220 V*
Rated frequency 50/60 Hz ± 5 %
Network configuration 3-phase, TN
Grid short circuit power scalable
Correction range 40 % for 30 s ± 10 % continuously
Single-phase dips from 40 % UN to 100 % UN for 30 s
Three-phase dips from 60 % UN to 100 % UN for 30 s
from 50 % UN to   90 % UN for 20 s
Overload capability 150 % IN (30 s)
Overload in bypass-mode 35 kA / 10 ms
Accuracy of the output voltage ≤ ± 1 %
Accuracy during voltage dips ± 3 %
Reaction time 220 µs
Transient time < halfwave
System efficiency > 98 %
Communication Ethernet (RJ45) / FTP-Server / Mail-Server
Parametrization/Analysis touch panel / Log-SD-Card / Mail
Degree of protection IP 20D*
Ambient temperature 0 °C (min.), 40 °C (max.)
Dimensions (w x d x h) 600 x 800 x 2282 mm (incl. socket)
Weight 900 kg
Power connection from the bottom, from the side, from behind,
Busbar connection with additional side cabinet
Height of connection points incoming 800 mm, outgoing 370 mm
Door hinges right
Options Maintenance bypass for bridging the system,
Measuring device for independent analysis Class A
* Other ratings on request
  Subject to changes

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