Research Article
Fuzzy Algorithm for Power Transformer Diagnostics
Table 2
Classification of faults by IEC method [
11].
| Fault type | Characteristic fault | | | |
| 1 | Normal ageing (N) | 0 | 0 | 0 | 2 | Partial discharge (PD) of low energy density | 0 | 1 | 0 | 3 | PD of high energy density | 1 | 1 | 0 | 4 | Discharges of low energy (D1) | 1-2 | 0 | 1-2 | 5 | Discharge of high energy (D2) | 1 | 0 | 2 | 6 | Thermal fault of low temperature (TL) < 150°C | 0 | 0 | 1 | 7 | TL between 150°C and 300°C | 0 | 2 | 0 | 8 | TL between 300°C and 700°C | 0 | 2 | 1 | 9 | Thermal fault of high temperature (TH) > 700°C | 0 | 2 | 2 |
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