An approach based on rough set theory for identification of single and multiple partial discharge source

Application of Joint Electro-Chemical Detection for Gas Insulated Switchgear Fault Diagnosis

“…When PD occurs in SF 6 gas, a portion of SF 6 molecules is decomposed and reacts with H 2 O and O 2 , which are impurities in SF 6 . Many kinds of chemical products are generated, such as SOF 4 , SOF 2 , SO 2 F 2 , SF 4 , SO 2 , CF 4 , CO 2 , HF [9], and so forth.…”

“…4, artificial defects were placed in the gas chamber filled with pressurized SF 6 . High voltage was applied to the artificial defects and PD was generated to decompose SF 6 , whose decomposition products were detected by a gas chromatograph (Varian CP-3800).…”

“…There are a variety of diagnostic approaches based on pulse current, acoustic, chemical, and ultra-high frequency (UHF) detection techniques [2][3][4][5][6][7][8][9][10]. However, each of these approaches can be performed effectively to some extent with its own limitations.…”

“…A major limitation encountered by UHF is the problem of discharge calibration. Lastly, more studies are needed for the chemical method of detecting SF 6 decomposition under PDs as it is a relatively new area. On the other hand, the diagnostic algorithms have not been completely resolved, despite their use for fault diagnosis, such as artificial neural networks (NN) [11], support vector machine (SVM) [12].…”

Threshold values determination in high-voltage equipment diagnosis insulation by registration methods of partial discharges

“…При исследовании частичных разрядов в трансформаторах, как и в любом другом высоковольтном оборудовании, в первую очередь необходимо правильно выбрать места для установки первичных преобразователей. Насколько корректно это будет сделано, настолько возможно эффективными будут последующие измерения частичных разрядов в изоляции [10,11].…”