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As an alternative insulating liquid of mineral oil, the silicone oil is widely used in the high voltage apparatuses where fireproofing and environment must be considered. Both the thermal aging and moisture threaten the reliability of the oil-paper insulating system. As a nondestructive measurement method, the frequency domain spectroscope (FDS) property of the electric apparatus has been used to...
Based on the platform designed for thermal aging test of oil-paper insulation system, the problem of thermal aging of solid insulation used in the oil-paper insulation of power equipment has been studied. The method of Frequency Domain Spectrum (FDS) has been applied to obtain frequency domain dielectric response properties of oil immersed paper insulation, and an unscrambling method according to...
To quantificationally apply the results of polarization and depolarization currents (PDC) measurement for condition evaluation of oil-paper insulation in power transformer, the differential time-domain spectroscopy (DTDS) theory and the extraction technique of sensitive characteristic parameters are introduced. A set of oil-immersed paper samples are thermally acceleratedly aged at high temperature...
New techniques are necessitated to be introduced for the diagnosis of large oil-immersed power equipments for the disadvantages of traditional methods such as not very good operability and accuracy. The Frequency Domain dielectric Spectroscopy (FDS) for the diagnosis of oil-paper insulation is presented in this paper. Specimens and on-site equipments under different conditions are measured using FDS...
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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