Abstract
Concentrations of population and business activities result in high energy demand in urban areas. This requires the construction of underground substations. Oil-free, nonflammable, nonexplosive equipment is recommended for underground substations. For this reason, gas-insulated transformers have been developed. A diagnostic method for gas-insulated transformers is thus required. This paper provides an experimental survey of the main components of decomposition gas generated by various faults in gas-insulated transformers carried out through simplified model tests. The phenomena of overheating and partial discharges are modeled, taking the actual materials related to each fault into account. For example, CO, CO2, and aldehydes are produced by overheating of pressboards and PET films. The amount of gas produced increases with rising temperature. While various gases are produced from a partial discharge, the principal components are SO2 and SOF2. These results will be used to develop a diagnostic method for gas-insulated transformers. © 1999 Scripta Technica, Electr Eng Jpn, 130(1): 48–58, 2000
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