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The synergic effects of bubble formation and partial discharge activity in oil-paper insulation are investigated. By controlled lab experiments and Finite Element Computation, the bubble emission rate under various level of partial discharge is studied. The intensification of electric field due to the presence of bubble in oil-paper insulation is calculated. Finally, the partial discharge activity...
Being a part of the power cable network, the cable terminal is more likely to have issues. And these problems usually derive from production or installation. In a regular PD check, an internal discharge caused by a design flaw in the cable terminal was found. And this design has been widely applied in the real practice. Aiming at this kind of defects, this paper figured out the causes of the fault,...
In the Partial Discharge (PD) measurement on transformer, the discharge quantity is calculated from the offline calibration. The calibrating waveform is standardized by IEC 60270:2000 with a rise time < 60 ns, or an equivalent up-band frequency > 6MHz. But the PD measuring instruments in use are standardized by the same document with an up-band frequency less than 500 kHz. Most of the energy...
Following the investigation of two recent transformer failures in winding insulation, researchers have carried out experiments to identify the cause of the failure, which was found to be the partial discharge initiation between transformer winding turns under harsh environment and its development to breakdown under normal operation condition over a long period. Further studies were carried out to...
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