Total Harmonic Distortion (THD) in UPS Systems
Total Harmonic Distortion (THD) in UPS Systems
What Is Total Harmonic Distortion (THD)?
THD refers to waveform distortion in electrical systems caused by non-linear loadsdevices that draw current in short, irregular pulses rather than in a smooth sinusoidal waveform like the voltage.
Common non-linear loads include:
- Computers and servers
- Variable speed motors
- Switched-Mode Power Supply (SMPS) equipment
- Modern office electronics and telecom systems
Problems Caused by High THD
When THD levels are high, several system-wide issues can arise:
- Voltage distortion Sensitive equipment may malfunction or underperform
- Overheating Transformers, conductors, and internal components can overheat
- Breaker tripping False alarms and system interruptions may occur
- Reduced power quality and efficiency Energy losses increase; sensitive devices may be damaged
How UPS Helps Reduce THD
Filtering Harmonic Currents
- Modern UPS systems include harmonic filters that smooth current waveforms and prevent disturbances from reaching connected equipment
Power Factor Correction (PFC)
- Many UPS models come equipped with PFC technology
- PFC reduces excess current draw from the power supply, helping lower THD levels
Double Conversion Technology
- Online double-conversion UPS systems convert AC to DC and back to AC
- This process isolates connected equipment from input disturbances, delivering clean, low-THD power
Active Harmonic Compensation
- High-end UPS models can actively detect and mitigate harmonic frequencies in real time
- Maintains clean and consistent power output even with fluctuating nonlinear loads
Improved System Stability
- Lowering THD improves power system reliability
- Reduces risks of overheating, equipment failure, and unplanned downtime
Compliance with Power Quality Standards
- Controlling THD helps ensure compliance with industry standards like IEEE 519 and IEC 61000-3-2, which define acceptable harmonic distortion levels
UPS Models Designed for THD Management
UPS systems like the BCN True Online series and Riello UPS modelsincluding Sentinel Dual, Multi Sentry, and other advanced linesare engineered specifically for environments with high non-linear loads.
These models deliver clean, stable power suitable for sensitive electronic systems and IT infrastructures.
Summary
Harmonic distortion (THD) significantly affects electrical performance, especially in environments with multiple non-linear loads.
A UPS designed to minimize THD not only ensures better power quality but also protects your systems, extends equipment lifespan, and increases energy efficiency.
BT Connect offers high-performance UPS solutions from Riello UPS and BCN UPS, designed to manage THD and support non-linear load environments.
Our expert team provides personalized consultation to help you select the best UPS for your applicationensuring both power stability and long-term value.
