Start with the symptom, not the inspection name.
Many teams start by asking for a method they already know. That is understandable, but it can lead to the wrong scope if the symptom points somewhere else. A hot connection, insulation activity, and unstable supply can all create electrical risk, but they do not need the same test.
A better question is: what are we trying to understand, and what evidence would help us decide the next maintenance action?
Why this question matters.
Choosing the wrong method can create false confidence. A clean thermal scan does not prove there is no insulation issue. A partial discharge test does not explain every nuisance trip. A power quality logger may not identify a loose termination. Each method has a useful place and a clear boundary.
How the methods differ.
Electrical thermography
Best for finding abnormal heat patterns under load: loose connections, overload symptoms, phase imbalance signs, or components running hotter than expected.
Partial discharge testing
Best for assessing insulation-related activity, especially where medium-voltage or critical assets need deeper condition insight.
Power quality analysis
Best for supply-related symptoms such as unexplained trips, harmonics, voltage variation, overheating, nuisance faults, or unstable equipment behaviour.
Combined assessment
Useful when the symptom is unclear, the asset is critical, or the maintenance decision needs stronger evidence than one method can provide.
When one method may not be enough.
A facility may begin with thermography because it is visible and practical, then discover that the real question needs another method. For example, repeated overheating may point to a load or harmonic issue. A critical asset with no obvious heat pattern may still need insulation condition checks. A recurring trip may need power quality data instead of a thermal image.
This does not mean every site needs every test. It means the inspection path should follow the evidence.
What to prepare before asking for advice.
- The symptom: heat, trips, noise, smell, failure history, instability, or unknown risk.
- The asset type and voltage level where relevant.
- Whether the equipment can be inspected while operating under normal load.
- How critical the asset is to operation, safety, or production.
- Any previous inspection, maintenance, or failure records.
- What decision the evidence needs to support.
AMKA's view
The best inspection method is the one that can answer the actual maintenance question. Sometimes that is thermography. Sometimes it is PD testing or power quality analysis. Sometimes it is a staged scope that starts simple and escalates only when the evidence justifies it.