![]() ![]() Other hydrocarbons provide a more detailed view on the kind of the defect. It can be seen that the hydrogen concentration always increases as the temperature increases thus making its concentration a good general indicator of the transformer state. The following picture is taken from the FIST 3-30 standard developed by the Bureau of Reclamation of the US department of the Interior and provides an overview of the gas generation rates dependent on the temperature. There is a clear dependency between the rates at which the gases are generated and the temperature of a spot inside the transformer that makes these gases generate. Such indicators provide a good possibility of a non-invasive transformer fault assessment. Carbon monoxide (CO) and dioxide (CO2) are generated as a result of paper decomposition. Such gases as hydrogen (H2), methane (CH4), acetylene (C2H2), ethylene (C2H4), and ethane (C2H6) are generated as a result of oil decomposition either due to the internal thermal or electrical faults inside the transformer. Certain transformer faults cause certain gases to be generated inside the transformer so the application of DGA is a widely accepted tool that can indicate which faults are emerging. This is a method to assess the overall state of a power transformer by measuring and analyzing the concentrations of gases dissolved in its oil. ![]()
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