Abstract
The gaseous products from a power transformer under overloading were analyzed by means of a mass spectrometer. Substantial amounts of hydrogen, carbon dioxide and lower hydrocarbons were detected in the gas formed from the overloaded transformer, while no detectable amount of these compounds were found in the case of normal condition. These results suggest that the mass spectrometric analysis of the transformer gas is a convenient method for checking up the operating condition of the power transformer.
