Harmonic Distortion in Commercial Buildings: Causes, Risks & Solutions in Australia
Understand what harmonic distortion is, why it happens in modern buildings, and how to fix it before it leads to costly electrical issues.
Harmonic distortion is one of the most common and overlooked electrical issues in commercial buildings across Australia. As modern buildings rely more heavily on electronic equipment, variable speed drives and LED lighting, the quality of electrical power can deteriorate without proper management.
Micron Group regularly identifies harmonic-related issues through power analysis and implements solutions such as Static VAR Generators (SVG) to restore system performance and stability.
What Is Harmonic Distortion?
Harmonic distortion occurs when electrical current is drawn in a non-linear way, causing the normal sine wave of the power supply to become distorted. Instead of a smooth waveform, the current becomes irregular, which places additional stress on electrical infrastructure.
This issue is increasingly common in commercial buildings due to the widespread use of modern electronic equipment.
What Causes Harmonics in Commercial Buildings?
The primary cause of harmonic distortion is non-linear electrical loads. These are devices that do not draw current evenly from the power supply.
Common sources include:
- Variable speed drives (VSDs) used in mechanical systems
- LED lighting systems and electronic drivers
- Uninterruptible power supplies (UPS)
- Computers, servers and IT equipment
- Battery charging systems and electronic control equipment
As these systems become more prevalent, harmonic distortion becomes more likely if not properly managed.
Why Harmonic Distortion Is a Problem
Harmonics can have a significant impact on the performance and reliability of electrical systems. While they are often not immediately visible, their effects can build over time and lead to serious issues.
- Overheating of cables, switchboards and transformers
- Overloaded neutral conductors
- Nuisance tripping of circuit breakers
- Reduced efficiency of electrical systems
- Premature failure of equipment
- Increased maintenance and operational costs
In many cases, these issues are misdiagnosed or treated symptomatically without addressing the root cause.
How to Identify Harmonic Issues
Harmonic distortion cannot be accurately assessed through visual inspection alone. The most effective way to identify the issue is through professional power analysis.
Micron Group uses specialised monitoring equipment to measure harmonic levels and assess their impact on the electrical system over time. This allows for accurate diagnosis and targeted solutions.
How to Fix Harmonic Distortion
1. Static VAR Generators (SVG)
Static VAR Generators are one of the most effective solutions for managing harmonic distortion in modern buildings. In addition to correcting power factor, SVG systems can actively compensate for harmonic currents and stabilise the electrical system in real time.
Learn more about Static VAR Generator (SVG) solutions.
2. Harmonic Filters
In some applications, passive or active harmonic filters may be used to reduce specific harmonic frequencies within the system.
3. System Design and Load Management
Improving system design, balancing loads and upgrading infrastructure can also reduce the impact of harmonics.
When Should You Investigate Harmonics?
- Electrical equipment running hotter than expected
- Frequent breaker tripping or unexplained faults
- High energy consumption without clear cause
- Recent installation of VSDs or LED lighting systems
- Expansion of electrical load within the building
Micron Group Harmonic Analysis and Solutions Sydney
Micron Group provides expert harmonic analysis and power quality solutions across Sydney. Our team combines real-world engineering experience with advanced monitoring tools to diagnose and resolve electrical issues in commercial buildings.
From initial power analysis through to system design and implementation of solutions such as SVG systems, we deliver practical, results-driven outcomes.
Book a Power Quality Assessment
If your building is experiencing unexplained electrical issues or you suspect harmonic distortion, Micron Group can assist with a detailed assessment and tailored solution.
Phone: (02) 9221 6155
Email: reception@microngroup.com.au
Frequently Asked Questions
Are harmonics common in commercial buildings?
Yes, harmonics are increasingly common due to the widespread use of electronic equipment, LED lighting and variable speed drives.
Can harmonic distortion damage equipment?
Yes, over time harmonics can cause overheating, reduce efficiency and lead to premature failure of electrical components.
Do Static VAR Generators reduce harmonics?
Yes, many modern SVG systems can assist in reducing harmonic distortion while also correcting power factor.