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Insulating oils are widely used in power transformers. The oil insulation degrades under multiple stresses during the transformer operation, which affects the insulation integrity and consequently could cause transformer failures. DC resistivity is one of the dielectric parameters of insulating oil for assessing transformer insulation conditions. This paper presents results of DC resistivity measurements...
Oil tests are crucial for condition assessment of transformers. Moisture, acidity, breakdown voltage, dissolved gas analysis and furans analysis are common oil tests carried out by utilities. IEC 60422 and IEC 60599 have specified some limit values for detecting any abnormalities based on oil tests. However, these limit values might not be suitable for all transformers at different ages or under different...
IEC 60897 (determination of lightning impulse breakdown voltage, LIBV) and IEC 61294 (determination of partial discharge inception voltage, PDIV) are designed with the purpose of evaluating insulating liquids' electrical property in a divergent field, and their current versions have existed for about two decades without revision. In view of the interest in the use of natural and synthetic esters in...
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