Title :
Partial discharge activity in gas-insulated system under composite voltage
Author :
Sarathi, R. ; Dubey, Vishal ; Srinivasa, Y.G.
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol. Madras, Chennai, India
Abstract :
In the present study, the partial-discharge activity under nonstandard voltage formed by ac and dc voltages was studied. It is identified that the ac superposed with positive dc enhances the discharge activity in the medium and if the ac voltage is superposed with the negative dc, it can mitigate the discharge activity. The acoustic emission signal generated due to the partial discharges in gas-insulated systems under the composite voltage formed by ac superposed with dc voltage/ac/dc voltages, has a dominant frequency content at around 250 kHz.
Keywords :
SF6 insulation; acoustic emission; gas insulated substations; gas insulated switchgear; gas insulated transformers; partial discharges; acoustic emission signal; composite voltage; gas-insulated system; partial discharge; AC generators; Acoustic emission; Acoustic sensors; Corona; DC generators; Geographic Information Systems; Partial discharges; Power system reliability; Sulfur hexafluoride; Voltage; Acoustic emission; SF6 gas; composite voltage; gas-insulated system (GIS); partial discharge;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2005.855484
