Under Voltage Three Phase Uninterruptible Power Supplies (UPS)
Description
Under Voltage Three Phase Uninterruptible Power Supplies (UPS) are designed to provide continuous, reliable power to critical systems by compensating for voltage sags and maintaining a stable power supply. These systems ensure that sensitive equipment remains operational during power disturbances by delivering a regulated output voltage.
Working Principle
Three-phase UPS systems operate by integrating with existing electrical systems to provide power conditioning, backup protection, and power distribution. They typically function in one of three modes: on-line or double-conversion, line-interactive, and off-line or standby. In the on-line or double-conversion mode, the load is continuously supplied from a power converter that receives input from a DC supply, ensuring uninterrupted power. Line-interactive systems work in parallel with conditioned AC power, only taking over full load power when the AC input fails. Off-line systems derive power directly from the power line until a failure occurs, at which point a battery-powered inverter takes over. These systems are useful because they maintain power quality and prevent disruptions in critical operations.
Applications
Three-phase UPS systems are commonly used in environments where power reliability is crucial. Specific applications include medical facilities where life-supporting systems must remain operational, data centers that require uninterrupted power for servers and storage systems, and industrial processing plants where power fluctuations can disrupt production lines. They are also essential in telecommunications to maintain network uptime and in emergency equipment to ensure availability during power outages.
Advantages over other Three Phase Uninterruptible Power Supplies (UPS)
One significant advantage of under voltage three-phase UPS systems is their ability to handle power sags effectively, which can be more frequent than complete outages. This capability ensures that sensitive equipment is protected from voltage fluctuations that could otherwise cause damage or data loss. Additionally, systems with low input Total Harmonic Distortion (THDi) can reduce the need for oversized generators and breakers, offering cost savings in infrastructure.
Limitations
A limitation of under voltage three-phase UPS systems is their dependency on battery life and maintenance. Batteries require regular checks and replacements, which can be costly and time-consuming. Furthermore, these systems may not be suitable for environments with extremely high power demands or where space constraints limit the installation of large battery banks.
Considerations
When selecting an under voltage three-phase UPS, consider the initial costs, which can be significant due to the need for high-quality components and installation. Operating expenses include regular maintenance and battery replacements, which are necessary to ensure system reliability. Durability and accuracy are critical, as these systems must consistently provide stable power. It's also important to evaluate the total cost of ownership, including potential savings from reduced infrastructure requirements due to low THDi.
from Fuji Electric Corp. of America
The UPS7000HX-T3U UPS Series includes 300, 400, and 500kVA, 480V 3-phase 3-wire transformer-less systems for critical applications such as data centers and medical facilities. [See More]
- Protection: Transient; Power Failure; Under Voltage; Unbalanced Loads
- Volt-Amp Rating: 300 to 500
- Technology: On-line (Double-conversion)
- Maximum Input Current: 409 to 682
from Fuji Electric Corp. of America
Fuji Electric ’s new UPS7300WX-T3U is an innovative transformer-less UPS designed for data centers and commercial applications, utilizing our patented RB-IGBT Technology and AT-NPC 3-Level Circuit Topology to deliver up to 97.5% efficiency and unparalleled reliability. [See More]
- Protection: Transient; Power Failure; Under Voltage; Unbalanced Loads
- Volt-Amp Rating: 225 to 330
- Technology: On-line (Double-conversion)
- Maximum Input Current: 307 to 439
from Fuji Electric Corp. of America
The UPS7400WX-T3U UPS Series utilizes expandable architecture to deliver any size unit from 225-1000kVA using 330 kVA modules, making it the ideal choice for data centers and other commercial applications. [See More]
- Protection: Transient; Power Failure; Under Voltage; Unbalanced Loads
- Volt-Amp Rating: 225 to 1000
- Technology: On-line (Double-conversion)
- Maximum Input Current: 409 to 682
from Huawei Technologies Co., Ltd.
The UPS5000-A is an online, double-conversion Uninterruptable Power Supply (UPS) that features high reliability, high efficiency, and high power density. The all-digital control technology provides excellent output in harsh work environments, which supplies uninterruptable power to large- and... [See More]
- Protection: Under Voltage
- Volt-Amp Rating: 30 to 800
from Eaton | Power Quality
The Eaton BladeUPS is a revolutionary power quality solution that is scalable and modular. BladeUPS expands power protection from 12 to 60 kW in a single 19-inch rack while reducing energy and cooling costs. Eaton also offers BladeUPS Preassembled Systems, the same great product, just simplified. [See More]
- Protection: Transient; Power Failure; Short Circuit; Surge; Voltage Sags; Under Voltage; Unbalanced Loads
- Volt-Amp Rating: 12 to 60
- Technology: On-line (Double-conversion)
- Wires: 4-Wire
from Huawei Technologies Co., Ltd.
This modular UPS is designed for large and medium data centers. All modules are hot-swappable, and each cabinet has a maximum capacity of 800 kVA. Maintenance or capacity expansion can be completed in approximately 5 minutes. Efificency is 95% at 20% load and 96% at 40% load. Power Module Capacity. [See More]
- Protection: Under Voltage
- Volt-Amp Rating: 25 to 800
from Eaton | Power Quality
The Eaton 9355 UPS provides premium double-conversion backup power and scalable battery runtimes for IT and electrical engineering infrastructure in corporate, healthcare, banking and industrial applications. Packing maximum battery runtime into a very small footprint, the 9355 UPS is a complete... [See More]
- Protection: Transient; Power Failure; Short Circuit; Surge; Voltage Sags; Under Voltage; Unbalanced Loads
- Volt-Amp Rating: 10 to 30
- Technology: On-line (Double-conversion)
- Half Load Runtime: 11 to 26
from Huawei Technologies Co., Ltd.
This modular UPS is designed for large and medium data centers. All modules are hot-swappable, and each cabinet has a maximum capacity of 800 kVA. Maintenance or capacity expansion can be completed in approximately 5 minutes. Efficiency is 96.5% at 20% load and 97% at 40% load. For a reliable,... [See More]
- Protection: Under Voltage
- Voltage: 380; 400V/415V
- Volt-Amp Rating: 50 to 800
- Operating Temperature: 32 to 104
from Eaton | Power Quality
The energy-efficient Eaton 9390 UPS provides backup power and scalable battery runtimes in a small footprint for mid-size data centers, medical equipment and other critical systems. With the groundbreaking Energy Saver System, the 9390 operates at 99% UPS efficiency and can pay for itself in three... [See More]
- Protection: Transient; Power Failure; Short Circuit; Surge; Voltage Sags; Under Voltage; Unbalanced Loads
- Wires: 3-Wire; 4-Wire
- Volt-Amp Rating: 20 to 160
- Voltage: 208; 380; 480; 600; 415 Volts