Structure the investigation
Transformer-related power-quality concerns may involve voltage variation, harmonics, imbalance, transients, interruptions, grounding, or loading. Record the symptom and operating condition before attributing a cause to the transformer.
Evidence to collect
| Evidence | Why it matters |
|---|---|
| Voltage and current trends | Shows steady-state and transient behavior |
| Load and motor schedule | Connects events to operating duty |
| Harmonic and imbalance data | Identifies non-linear or uneven loads |
| Transformer nameplate and taps | Establishes ratio, impedance, and operating basis |
| Protection and grounding records | Clarifies trips and fault paths |
Scope boundary
This guide does not diagnose a live system or assign corrective settings. A qualified power-quality engineer should verify measurements and recommendations.
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