A Comparative Study of Empirical and Variational Mode Decomposition on High Voltage Discharges

Uzunoğlu, Cengiz Polat

doi:10.5152/iujeee.2018.1811

Cited by 4 publications

(2 citation statements)

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“…Zerocross Density Decomposition (ZCD) is a more recently developed technique [25] which is based on the concept of zero-crossings and is computationally more efficient than EMD. However EMD is more effective than DD in terms of accuracy and robustness when dealing with non-stationary signals [26]. Our algorithm does not split a time series into constituents as EMD or ZCD do and our method is less sensitive to noise because we use the Lomb-Scargle periodogram [13] to calculate periodicity, an algorithm which tolerates irregular sampling and missing data.…”

Section: Calculating Periodicity Intensity Using Time-lagged Overlapp...mentioning

confidence: 99%

Periodicity Intensity Reveals Insights into Time Series Data: Three Use Cases

Smeaton,

2023

Preprint

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Section: Calculating Periodicity Intensity Using Time-lagged Overlapp...mentioning

confidence: 99%

Periodicity Intensity Reveals Insights into Time Series Data: Three Use Cases

Smeaton,

2023

Preprint

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“…Although dielectric liquids are easy to implement in the insulating systems and provide electrical insulation effectively, they are very sensitive to impurities due to their specific chemical structure. In particular, pollutant materials within the structure such as solid particles [3,4], gas bubbles [5], or water droplets [6,7] greatly reduce the dielectric performance of insulating liquids [8]. There are many methods, such as, for example, the AC breakdown voltage and dielectric dissipation factor measurement, gas chromatography, and the determination of the moisture content in oil, which are used to estimate the condition of a given dielectric liquid [9,10].…”

Section: Introductionmentioning

confidence: 99%

Using the Method of Harmonic Distortion Analysis in Partial Discharge Assessment in Mineral Oil in a Non-Uniform Electric Field

et al. 2020

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In high-voltage equipment, it is vital to detect any failure in advance. To do this, a determination of the partial discharges occurring at different voltage types as well as at different electrode configurations is essential for observing the oil condition. In this study, an experimental setup consisting of a needle–semi-sphere electrode configuration immersed in mineral oil is prepared for laboratory experiment. In such a way, a non-uniform electric field is created and the leakage currents are monitored from the grounded electrode. A total of six different electrode configurations are analyzed during the tests by the use of hemispheres of different diameters as grounded electrodes and copper and steel pointed (medical) needle high-voltage electrodes. In the experiments, the partial discharges occurring at four different voltage levels between 5.4 and 10.8 kV are measured and recorded. The effect of the different electrode configurations and voltage levels on the harmonic distortion are noted and discussed. It is experimentally confirmed that it is possible to measure the leakage current caused by the partial discharges of the corona type in oil at the different metal points, creating high-voltage electrodes and different electric field distributions based on the proposed non-invasive measurement technique. The studies showed that there is a significant rise of even harmonic components in the leakage current during the increase in the partial discharge intensity with the 5th harmonic as dominant.

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