Interpreting Duval Triangle & Roger Ratios in Transformer Oil DGA Diagnostics

Detecting early stage partial discharge, arcing, and thermal insulation degradation before catastrophic transformer failure.

1. Dissolved Gas Generation Mechanisms

Under electrical and thermal stress, mineral insulating oil and cellulose insulation decompose into combustible gases: hydrogen (H2), methane (CH4), acetylene (C2H2), ethylene (C2H4), and ethane (C2H6).

2. Duval Triangle Diagnostic Method

By plotting percentage concentrations of CH4, C2H4, and C2H2 on a triangular coordinate chart, maintenance engineers pinpoint fault zones accurately—differentiating low-energy spark discharges from high-energy power arcs.

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