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Duval Pentagon Dashboard

Unified diagnostic dashboard for all Duval Pentagon methods

IEEE Std C57.104-2019 compliant 5-gas analysis for power transformers

Duval Pentagon Dashboard

Unified diagnostic dashboard for all Duval Pentagon methods

Step 1Select Transformer Oil Type

Choose the type of insulating fluid and transformer compartment

Mineral Oil (Main Tank): Traditional mineral-based transformer oil - main tank analysis

Pentagon 1 (IEEE 2019): 9-zone analysis (40% vertex)Pentagon 1 (CIGRE 2023) ★: 9-zone analysis (33.33% vertex)Pentagon 2 (IEEE 2019): 9-zone thermal (40% vertex)Pentagon 2 (CIGRE 2023) ★: 9-zone thermal (33.33% vertex)Unified Pentagon (CIGRE 2023) ★★: 11-zone combined method

Step 2Select Pentagon Tool

Choose the appropriate Pentagon diagnostic tool for your analysis

Step 3Pentagon Analysis

Enter gas concentrations and view diagnostic results

Selected Configuration:
Mineral Oil (Main Tank)Unified Pentagon (CIGRE 2023) ★★

Gas Concentrations

Total Gas
0ppm

Hydrogen

Recommended range: 0 to 150 ppm

Methane

Recommended range: 0 to 120 ppm

Acetylene

Recommended range: 0 to 35 ppm

Ethylene

Recommended range: 0 to 50 ppm

Ethane

Recommended range: 0 to 65 ppm
Enter gas values to begin analysis

About Pentagon Analysis

The Duval Pentagon methods use 5-gas analysis (H₂, CH₄, C₂H₂, C₂H₄, C₂H₆) to provide comprehensive transformer fault diagnosis. Pentagon 1 identifies the primary fault type, while Pentagon 2 provides detailed sub-classification of thermal faults. These methods are IEEE C57.104-2019 compliant and offer superior accuracy compared to traditional 3-gas triangle methods.

Learn more about Pentagon methods → →Contact us for professional analysis

About This Duval Pentagon Calculator

TriboTech's Duval Pentagon dashboard provides all 5 pentagon variants with full alternative fluid support. This is the only free online tool that includes Pentagon 3 with 4 different ester fluid types (Rapeseed, Soybean, Sunflower, Synthetic Ester) plus Pentagon 4/4b for advanced thermal fault analysis.

  • Pentagon 1: 10-zone mineral oil analysis using 5 gases (H2, CH4, C2H2, C2H4, C2H6)
  • Pentagon 2: Thermal fault sub-classification (S, O, C, T3-H zones)
  • Pentagon 3: Alternative fluids with 4 ester variants and 7 zones per fluid
  • Pentagon 4: Advanced thermal analysis for alternative fluids
  • Pentagon 4b: Partial discharge sub-zones (D1-P, D2-P) for alternative fluids
IEEE C57.104-2019
IEC 62770
IEC 61099

5 Pentagon Variants

Complete 5-gas DPM method coverage with IEEE-compliant zone geometries

4 Ester Fluid Types

Rapeseed, Soybean, Sunflower natural esters plus Synthetic Ester (Midel 7131)

Thermal Sub-Analysis

Pentagon 2, 4, 4b provide detailed thermal fault classification