Title :
A Thermodynamic Approach to Evaluation of the Severity of Transformer Faults
Author :
Jakob, Fredi ; Noble, Paul ; Dukarm, James J.
Author_Institution :
State Univ., Sacramento, CA, USA
fDate :
4/1/2012 12:00:00 AM
Abstract :
Dissolved gas analysis (DGA) has been used to classify the type and severity of faults in transformers. The method commonly used to identify severity is to measure the total fault gas concentration and its rate of change, without regard to the relative concentrations of individual gases. Thermodynamic analysis indicates that the energy required to form gases increases in the order CH4 <; C2H6 ≤ CO ≤ C2H4 <; H2 ≪ C2H2. Based on these results, an energy-weighted dissolved gas analysis (EWDGA) is proposed, where concentrations of individual gases are multiplied by a weighting factor that is proportional to the energy required to produce each gas. Statistical calculations are used to show that EWDGA is more sensitive to high-energy faults than simple DGA, hence minimizing the damage caused by those faults.
Keywords :
chemical analysis; fault diagnosis; sensitivity; thermodynamics; transformer oil; damage minimization; energy-weighted dissolved gas analysis; fault gas concentration; gases concentrations; high-energy faults; statistical calculations; thermodynamic approach; transformer faults severity; Carbon; Compounds; Gases; Oil insulation; Power transformers; Sensitivity; Thermodynamics; DGA gases; DGA thermodynamics; Dissolved gas analysis (DGA) energy; IEEE DGA guide; fault severity; faults in oil;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2011.2175950