Research Article
Multiparameter-Based Fuzzy Logic Health Index Assessment for Oil-Immersed Power Transformers
| | Serial no. | Oil quality parameter | Testing method/instrument | Standards |
| | 1 | Breakdown voltage (kV) | Megger OTS100AF and Foster OSTS100F (0–100 kV) | IEC 60156 |
| | 2 | Water content moisture (ppm) | Karl Fischer Titration (KFT) method Moisture-in-oil sensor | ASTM D1533 |
| | 3 | Acidity | Chemistry neutralization method | ASTM D947 |
| | 4 | Colour and appearance | Transmitted light and visual inspection | IEC-ISO 2049 ASTMD-1524 |
| | 5 | Dielectric dissipation factor (DDF) | Oil tan delta & resistivity test kit ex. MOTR | IEC 60247 |
| | 6 | Interfacial tension (IFT) | Tensiometer | ASTM D-971 |
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