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Duval Diagnostic Tools

Advanced transformer fault analysis using dissolved gas analysis

1Select Transformer Oil Type

Select Transformer Oil Type

2Select Diagnostic Tool

Choose the appropriate Duval tool for your analysis

3Gas Concentrations

Input the dissolved gas analysis results from your transformer

Gas Concentrations

ppm

Duval Triangle 1 requires: CH₄, C₂H₄, C₂H₂

Enter all gas values for comprehensive analysis across different tools

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Total Required Gases (CH₄, C₂H₄, C₂H₂)0.0 ppm
Total All Gases0.0 ppm
Selected Configuration:
Mineral OilDuval Triangle 1

About This Duval Triangle Calculator

TriboTech's Duval Triangle tool includes all 7 triangle variants in a single interface, making it the most comprehensive free DGA interpretation tool available online. This tool implements the latest CIGRE 2023 corrections including refined arcing sub-zones (D1-H, D1-P, D2-H, D2-P) and the OC-zone toggle for mineral oil carbonization detection.

  • Triangle 1: Primary mineral oil analysis (CH4, C2H4, C2H2)
  • Triangle 2: OLTC (On-Load Tap Changer) diagnostics
  • Triangles 3 & 3b: Alternative fluids (Silicone, Midel 7131, FR3, Biotemp)
  • Triangles 4 & 5: Low-temperature and thermal fault refinement
  • Triangles 6 & 7: FR3 natural ester specialized analysis
IEEE C57.104-2019
IEC 60599:2022
CIGRE TB 771

7 Triangle Variants

Complete coverage from primary mineral oil to FR3 natural esters

CIGRE 2023 Zones

D1-H/D1-P and D2-H/D2-P arcing sub-zones with partial discharge distinction

OC-Zone Toggle

Oil carbonization detection for mineral oil transformers