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In this paper, the rapid aging due to Partial Discharge (PD) activity was investigated in unaged and thermally aged oil-impregnated paper with a disk-shaped cavity between the sheets of paper. The PD inception voltage and the voltage for instantaneous breakdown were measured, and the time to breakdown was measured by applying voltages less than the instantaneous breakdown voltage. A comparison between...
Return Voltage Measurements are an efficient tool to measure the dielectric properties of an insulating system and thus to characterize the degradation of cellulose-oil insulations. They are widely used for the diagnosis of power cables. As a consequence of misinterpretations of the results in the past, the use Return Voltage Measurements for power transformers has been reduced. Nevertheless - performing...
Dielectric properties of oil-paper insulation transformer are influenced intensively by moisture; therefore, it is imperative to assess integral condition of oil-paper insulation for assuring normal operation of power transformers. As a non-destructive diagnostic technique, return voltage measurements have been introduced for the assessment of water content in transformer pressboard. This paper further...
Return Voltage Measurements are an efficient tool to measure the dielectric properties of an insulating system and thus to characterize the degradation of cellulose-oil insulations. They are widely used for the diagnosis of power cables. As a consequence of misinterpretations of the results in the past, the use Return Voltage Measurements for power transformers has been reduced. Nevertheless - performing...
Accurate condition assessment of power transformer is needed to guarantee transformer operation safely and reliably. In this paper the technique and application of return voltage measurement and some results of dielectric response measurements of several transformers was introduced. Voltage response measurements were performed on various transformers with different voltage grades, various operating...
Moisture and degradation of oil-immersed power transformer dielectric material are the key factors for its failures. Therefore, in this paper moisture content, aging degree and their influence on transformer dielectric material are discussed. Chemical analyses can provide direct information on parameters, however, most chemical analyses must be performed under laboratory conditions and for some chemical...
Return Voltage Measurements are an effective tool to characterize the degradation of cellulose-oil-insulations and are widely used for the diagnosis of power cables. For power transformers the use is not so widespread. Nevertheless the application on power transformers is also very promising, especially because the geometry of the insulation system in a power transformer is closer to the conditions...
Moisture and ageing in power transformer strongly influence the dielectric properties of oil/paper insulation system. Moisture measurement in oil sample generally gives inconclusive information since oil/paper moisture equilibrium is temperature dependent and takes a long time to be in equilibrium. Direct moisture measurement of paper sample is not practicable for in-service transformers. The measurement...
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