|Method||Gas Chromatography utilising both Flame Ionisation and Thermal Conductivity Detection|
The study of dissolved gases in transformer oils is key in understanding a vast array of faults that can occur in such a system, with difference faults generating unique proportions of certain gases, including overheating, arcing and partial discharge.
A small portion of each sample is transferred to a headspace vial and heated for liberate the gaseous components from the oil. Some of this gas is then injected into the gas chromatograph, where the compounds are separated, identified and quantified.
Results for levels of atmospheric gases (nitrogen and oxygen), carbon dioxide, carbon monoxide, hydrocarbons (acetylene, ethylene, methane and ethane) and hydrogen.
All results are presented in parts per million (ppm).
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