Modern commercial buildings are filled with energy-efficient technologies—but many of these devices introduce hidden electrical problems that reduce efficiency, shorten equipment life, and increase operating costs.
As LED lighting, Variable Frequency Drives (VFDs), switch-mode power supplies, computers, EV chargers, and other electronic equipment become more common, electrical systems are experiencing significantly higher levels of harmonic distortion than they were ever designed to handle.
The good news? These issues can often be identified, measured, and significantly reduced.
Traditional electrical loads such as incandescent lighting and electric resistance heaters draw current in a smooth sine wave that closely follows the utility voltage waveform.
Modern electronic equipment behaves differently.
LED drivers, VFDs, UPS systems, computers, battery chargers, and many HVAC controls draw current in short pulses rather than a smooth wave. These pulsed loads generate harmonics—additional frequencies that ride on top of the normal 60 Hz electrical system.
Instead of one clean sine wave, your electrical system becomes filled with multiple harmonic frequencies that create distortion throughout the building.
Today's commercial facilities may have dozens—or hundreds—of harmonic-producing devices.
Typical sources include:
Ironically, many of the technologies installed to improve energy efficiency can also create power quality challenges if the electrical system isn't designed to manage them.
Power quality problems often develop gradually, making them difficult to recognize until equipment failures or rising utility costs become noticeable.
High harmonic levels can contribute to:
Transformers serving nonlinear loads frequently operate at higher temperatures because harmonic currents create additional core and winding losses.
Triplen harmonics (3rd, 9th, 15th, etc.) from single-phase electronic loads add together in the neutral conductor instead of canceling.
High harmonic distortion can contribute to:
Electric motors supplied by distorted voltage operate hotter and less efficiently.
Distorted current waveforms can cause protective devices to trip unexpectedly, interrupting production.
Many facilities focus only on reducing kilowatt-hour (kWh) usage while overlooking the quality of the electricity flowing through their systems.
Poor power quality can increase costs through:
Although these costs don't appear as separate line items on a utility bill, they can significantly increase operating expenses.
Power quality professionals commonly evaluate harmonic performance using Total Harmonic Distortion (THD).
The two most common measurements are:
Current distortion is often much higher because nonlinear loads inject harmonic currents into the electrical system.
Monitoring both values provides valuable insight into the health of your electrical distribution system.
Improving power quality usually begins with a professional electrical assessment.
Solutions may include:
Each facility has unique electrical characteristics, making a professional evaluation essential.
The Powerhouse® Power Optimization System is designed to improve the performance of commercial electrical systems by optimizing voltage characteristics, balancing electrical phases, and reducing losses associated with poor power quality.
Depending on the electrical system, facilities may experience:
Rather than simply treating one symptom, Powerhouse works to improve the overall health of the building's electrical distribution system.
Powerhouse is especially effective in facilities such as:
If your building contains extensive LED lighting, Variable Frequency Drives, UPS systems, or other nonlinear electrical loads, a professional power quality assessment can identify hidden electrical inefficiencies.
Pacific Lamp Wholesale provides commercial power quality assessments and Powerhouse® Power Optimization solutions throughout the Pacific Northwest.
Contact us today to schedule your power quality evaluation and discover how improving power quality can increase efficiency, reduce operating costs, and extend the life of your electrical equipment.
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