Table of Contents

1. Introduction to Three-Phase UPS Systems
2. Working Principle of Three-Phase UPS Systems
3. Advantages of Three-Phase UPS Systems
4. Kelida Company Solutions
5. Conclusion
6. References

Introduction to Three-Phase UPS Systems

Three-phase Uninterruptible Power Supply (UPS) systems are critical components in industrial and commercial power management. They provide continuous power by converting stored energy in batteries into AC supply during primary power source failures. These systems ensure that critical equipment continues to operate without interruption.

Working Principle of Three-Phase UPS Systems

The operation of a three-phase UPS system involves several key components and processes:

1. Rectifier: Converts incoming AC power to DC power and charges the battery bank. Typical rectification efficiency is around 95%.
2. Battery Bank: Stores electrical energy. Battery voltage levels can range between 192V and 480V, depending on system design.
3. Inverter: Converts DC power back to AC. It typically operates at an efficiency of 94-96%, and outputs clean three-phase power at 400V±1%, 50Hz or 60Hz.
4. Static Switch: Provides instantaneous switchover from utility to battery power, generally less than 4-5 milliseconds, to prevent loss of power during transition.

The three-phase UPS handles load balancing across three phases, typically maintaining a power factor greater than 0.9.

Advantages of Three-Phase UPS Systems

• Higher capacity for large load support, up to several hundred kilowatts.
• Increased efficiency with typical values above 90% under full load conditions.
• Improved capability to handle non-linear loads and harmonic distortions.
• Reduction in conductor size due to balanced load distribution among phases, lowering cabling costs.

Kelida Company Solutions

Kelida provides a range of three-phase UPS systems designed for robustness and reliability. Their solutions feature:

• Advanced Monitoring: Real-time diagnostics and remote monitoring capabilities via integrated software suites.
• Scalability: Modular design allows scalability from 30 kVA to 500 kVA, catering to evolving power demands.
• Environmental Adaptability: Operates efficiently in varied environmental conditions with an operational temperature range from 0°C to 40°C.
• High Fault Tolerance: N+1 redundancy configuration options ensure continuous service even during component failures.

Conclusion

Three-phase UPS systems are essential for ensuring power stability in environments with substantial and critical electrical demands. Their design accommodates large, diverse loads with high efficiency and reliability. Companies like Kelida provide well-engineered solutions that address both present and future needs.

References

• IEEE Standard for Uninterruptible Power Supply Systems.
• Manufacturer’s Handbook on UPS Systems, Edition 2023.
• Technical Documentation by Kelida Company.