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• W2161185350 abstract "Partial discharges in oils are influenced by the actual dielectric properties of the liquid and especially degradation products may influence the phenomena. As a consequence of ageing processes in the liquid, oil molecules may be split into molecules of shorter lengths. The energy of a PD in the oil may heat the liquid locally and especially low molecular weight prod- ucts in the oil will evaporate and form a gaseous phase within the liquid. This second phase can be generated in solids as well as in liquids. In solids the pressure in this gas phase will increase in accordance to the concentration of gas molecules. In liquids, an increase of the concentration of molecules will lead to an extension of the gas volume until the pressure within the void corresponds to the external gas pressure. Consequently, in accordance to Paschen's law gas discharges may occur in this gas phase immediately (i.e. within µs) after a PD that generated the gas filled void. The sequence will be so quick that commonly used equipment may not be able to monitor these discharges separately. Analyses of the pulse shape of the PD signals after the band pass filter showed differences in accordance to the degree of ageing of the oils exam- ined. Possibilities to use characteristic parameters of the pulse shape for diagnostic purposes and especially their correlation to other dielectric properties will be discussed in detail. 1. Experimental Procedure and Data Analysis The PD behaviour of oils from transformers used in different power grids was analyzed using a needle-plane arrangement with an electrode gap of 10 mm and a needle electrode with a curvature of about 5 µm. The voltage was increased linearly with about 2.5 kVrms/min up to approximately 15 kVrms and then kept constant for about 7 h or until 4000 PD pulses had oc- curred, whichever came first. With different oils different PD rates were found. In general, the oils had comparatively low PD rates, so in some of the measurements within 7 h only 500 PD occurred. Consecutive PD measured in oils are not correlated, they appear with a statistical distribution over time. The PD pulses are sampled after passing the 40 - 400 kHz band pass filter of the PD detec- tor. The shape of the oscillating signals after the band pass filter can be characterized by pa- rameters such as the amplitudes I1, I2 and I3 of the first three peaks, their times of occurrence t1, t2 and t3 with respect to the trigger time, the zero crossings t4, t5 and t6 and the areas A1, A2 and A3 under the curve between the zero crossings, i.e. under the peaks. A special software extracts the analysis parameters, including those mentioned above, and creates a matrix for further processing. Figure 1 shows an impulse response of a calibration pulse (a damped oscillating signal) with these characteristic parameters." @default.
• W2161185350 created "2016-06-24" @default.
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• W2161185350 date "2010-03-30" @default.
• W2161185350 modified "2023-09-25" @default.
• W2161185350 title "Pulse Shape Analysis of PD Signals – an efficient Tool to Monitor the Condition of Oils" @default.
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• W2161185350 doi "https://doi.org/10.15676/ijeei.2010.2.1.4" @default.
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