Duval Triangle 1 — Interactive DGA Calculator
Enter dissolved gas concentrations in ppm. The calculator normalizes CH₄, C₂H₄, and C₂H₂ to percentages and plots the result on the Duval Triangle with automatic fault diagnosis.
Gas Concentrations (ppm)
Duval Triangle 1 — IEC 60599 Annex B
Fault Zone Reference
| Zone | Fault Type | Temperature / Energy | Action |
|---|---|---|---|
| PD | Partial Discharge | Low energy | Monitor & trend. Investigate if increasing. |
| T1 | Thermal fault < 300°C | Low temperature | Schedule inspection. Check for overload. |
| T2 | Thermal fault 300-700°C | Medium temperature | Plan outage. Loose connection likely. |
| T3 | Thermal fault > 700°C | High temperature | Urgent. Carbonized paper risk. |
| D1 | Low-energy discharge | Spark / tracking | Investigate within 1 month. |
| D2 | High-energy discharge | Arcing — extreme | IMMEDIATE shutdown. Major failure risk. |
| DT | Mixed thermal + electrical | Combined fault | Investigate. May be fault in transition. |
📖 Read the Complete Duval Triangle Guide → 📊 All DGA Diagnostic Methods →