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Dissolved gas analysis
Dissolved gas analysis (DGA) is the study of dissolved gases in transformer oil.〔Herbert G. Erdman (ed.), ''Electrical insulating oils'', ASTM International, 1988 ISBN 0-8031-1179-7, p. 108〕
Insulating materials within transformers and electrical equipment break down to liberate gases within the unit. The distribution of these gases can be related to the type of electrical fault, and the rate of gas generation can indicate the severity of the fault. The identity of the gases being generated by a particular unit can be very useful information in any preventative maintenance program.〔(【引用サイトリンク】title=DISSOLVED GAS ANALYSIS OF MINERAL OIL INSULATING FLUIDS )〕
The collection and analysis of gases in an oil-insulated transformer was discussed as early as 1928. Many years of empirical and theoretical study have gone into the analysis of transformer fault gases.
DGA usually consists of sampling the oil and sending the sample to a laboratory for analysis. Mobile DGA units can be transported and used on site as well; some units can be directly connected to a transformer. Online monitoring of electrical equipment is an integral part of the smart grid.
== Oil ==
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