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This work presents a study of Dissolved Gas Analysis in samples of mineral insulating oil, corrosive or suspicious corrosive according to the test ASTM D1275B. The results showed that the change of the properties of the attacked surfaces causes a malfunction in the transformer. It seems from the results that the DGA should be consider as important diagnostic tool for the presents of corrosive factors...
In this paper an experimental work regarding power quality in existing dc traction systems is presented and evaluated. The measurements were performed in two substations of the Athens-Piraeus Electric Railways (ISAP), according to the European standard EN 50160 and EN 61000, using 3 wire connection systems. The examined traction system use 600V DC. The main supply systems usually consist of a medium...
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