Machines failing… even though harmonics look normal? You might be dealing with “Supraharmonics.”

❓ Have you experienced any of these?

• Machines or electronic systems failing earlier than expected — even with UPS backup

• Computers or IEDs restarting on their own or behaving erratically without a clear cause

• PLC communication issues, unstable signals, or unreliable smart meter readings

• Capacitors overheating, failing frequently, or tripping without obvious reasons

• Transformers or cables running hotter than normal

• Cable insulation degrading faster than expected

• Light flicker or unusual electrical noise

• LED lighting with shorter lifespan despite “normal” conditions

• Breakers / RCDs tripping unexpectedly

• Protection relays mis-operating without actual faults

• Production systems or critical equipment stopping without warning

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👉 If your answer is “yes”

There is a high chance you are facing a problem that conventional measurement systems cannot see

And that is ⚡ Supraharmonics

Many of you are already familiar with Harmonics, a well-known power quality issue that has been studied and managed for years

But today…there is another phenomenon that has evolved beyond harmonics

👉 And it is becoming a real issue in modern electrical systems

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🔍 What are Supraharmonics?

Supraharmonics are distortions in waveforms in the frequency range of 2 kHz – 150 kHz

👉 In simple terms: they are high frequency disturbances generated by modern electrical equipment

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⚠️ Why is this problem becoming more visible “now”?

In the past:

• Power electronics mainly used diodes and thyristors

• Harmonic issues were concentrated at lower frequencies

But today:

• Solar, EVs, and automation systems are everywhere

• Systems rely heavily on switching devices and transistor-based converters

👉 The result: Even though low-frequency harmonics may decrease, new emissions appear at higher frequencies instead

👉 In short: New technologies solve old problems…but create new ones in a different frequency range

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🏭 Real-world sources

• Solar inverters

• EV chargers

• VFDs / drives

• LED / switching power supplies

• PLC communication systems

👉 Simply put: Almost every “modern” electrical device = a potential source

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👻 The biggest problem: you can’t see it

• Conventional instruments have frequency limitations (~kHz range)

• They are not designed to measure 2–150 kHz

👉 Which means:

The problem may already exist in your system

…but you have never seen it

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🌐 Why this will only get worse

Global trends:

• Renewable energy

• EV adoption

• Data centers

• Industry 4.0

👉 All of these = more power electronics

And that means: ⚡ Supraharmonics will definitely increase

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🔧 What should you do?

Short answer: 👉 You need to make it visible first

What is required:

• Measurement tools covering 2–150 kHz

• Continuous monitoring

• Correlating data with real system events

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🔍 Conclusion

Supraharmonics are not entirely “new”

But they are:

👉 Newly recognized

👉 And rapidly increasing

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📞 Call to Action

Don’t let an invisible problem

become the most expensive source of downtime in your system

📞 Contact our engineering team

to find the right tools to actually “see” this problem

📩 Contact us:

🌐 Website: https://www.truewatts.co.th

📧 Email: info@truewatts.co.th

▶️YouTube:TrueWatts Team - YouTube

📞 Tel: +66 64-409-6362