Long-Term Sequential Characteristics of Negative Partial Discharge in Pressurized SF6 Gas
SF6 gas insulated electric power apparatus such as GIS and GIL have been operated under high gas pressure condition at around 0.5 MPa-abs[1,2]. Here, metallic particle contaminants in GIS would generate negative partial discharges (PD) firstly, because negative PD inception voltage is lower than positive one. In such high gas pressure condition, there is a possibility that breakdown occurs without replete positive PD precursor to it. In this case, only negative PD measurement could be a method for the insulation diagnosis. Therefore, in the commissioning process and under operation, it is important for the insulation diagnosis at the early stage to clarify the negative PD mechanism under high gas pressure condition.
KeywordsPulse Sequence Pulse Train Needle Electrode Partial Discharge Initial Electron
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