The gassing properties of aromatic hydrocarbons

摘要

Last year at this conference we discussed various methods for measuring the gassing properties of cable oils under electrical stress and described a modification of the Pirelli test designed for rapid and convenient operation. In using this apparatus on various natural and synthetic hydrocarbon oils, we have found a great diversity in gassing behavior, especially with changes in temperature. While the gassing coefficient of some oils is nearly unaffected by changing temperature, that of other oils changes rapidly and may actually reverse its sign. In some cases an increase in temperature will cause a gas-adsorbing oil to become gas-evolving; in other cases the reverse change may take place.