The OSKAR® Dynamic Voltage Restorer (DVR) has been developed to protect critical processes against voltage dips, voltage variations and phase deviations. Using advanced power electronics, the system corrects the mains voltage almost instantly without the need for batteries or supercapacitors.
This enables sensitive equipment and installations, such as MRI and CT scanners, variable frequency drives and critical control systems, to operate without interruption. Unplanned production downtime, quality losses and maintenance costs are therefore kept to a minimum.
As OSKAR® does not use energy storage, the system offers significant advantages compared with conventional UPS systems and solutions based on supercapacitors. It provides higher efficiency, requires less installation space and delivers considerably lower investment and maintenance costs.
Real-time voltage correction
As a Dynamic Voltage Restorer (DVR), OSKAR® continuously monitors the mains voltage and corrects voltage dips, overvoltages and phase deviations in real time.
With a response time of just 0.2 ms and a correction time of less than half a mains cycle (<10 ms), voltage disturbances are compensated almost instantly.
Depending on the configuration, the system can correct three-phase voltage dips down to 40% and single-phase voltage dips down to 60%. It also provides continuous voltage regulation of ±10%.
Robust industrial design
OSKAR® is built around a series transformer and a four-quadrant power converter with Active Front End (AFE) technology.
This ensures that the short-circuit capability of the installation is maintained and existing protection settings generally do not require modification.
The integrated redundant bypass ensures that the load remains energised during internal faults or maintenance. For applications where maximum availability is required, an optional service bypass is available.
Modular and future-proof
Thanks to its modular design, multiple systems can be connected in parallel, allowing the solution to easily scale with future power expansions.
With an efficiency of more than 98.5%, minimal maintenance requirements and no need for energy storage, OSKAR® provides an energy-efficient and highly reliable solution for industrial installations where a stable supply voltage is essential.
Technical features
- Dynamic Voltage Restorer (DVR)
- Continuous voltage regulation of ±10%
- Voltage dip correction down to 40% (three-phase) and 60% (single-phase)
- Response time: 0.2 ms
- Correction time: <10 ms
- Efficiency: >98.5%
- Overload capability: 150% for 30 seconds
- Active Front End (AFE) technology
- Modular design and parallel expandability
- Ethernet, FTP, Modbus and integrated data logging
Advantages compared with UPS systems
- ~70% lower cost
- ~70% smaller footprint
- ~70% lower maintenance costs
- 3 to 10 times higher efficiency
