The importance of statistical characteristics of partial discharge data

Application of pulsed x-ray induced partial discharge measurements

“…First reports on xray application to PD detection were published in the 60`s [6] and more recent works can be found in [7][8][9][10]. In [8] a strong influence of continuous x-ray irradiation on the partial discharge mechanism and pattern was observed.…”

“…Figure 1). This assumption of ionized gas molecules in the void has been made in previous experiments using x-ray triggered PDs [6][7][8][9][10][11][12].…”

Investigating the inception mechanism of pulsed x-ray triggered partial discharges by time resolved measurements

“…The measured phase resolved PD patterns did not differ from the naturally triggered ones [13]. The main difference of PXIPD to the XIPD shown in [6][7][8][9][10] is that the X-ray pulse supplies only the start electrons for the first PD, the subsequent PDs are not supported by the X-ray beam.…”

“…Niemeyer et al [9] used continuous X-rays for PD inception at artificially produced spherical voids (~ 0.2 mm) in transparent epoxy. Small spherical voids showed PD only during X-ray application, thus no sustainable PD development was possible without X-ray for voids in this size range.…”

X-ray triggered PD measurements in small sized spherical voids at the detection limit

“…For industrial applications like factory outgoing tests, however, testing time has to be reduced to a minimum and therefore immediate inception after voltage application is highly desirable [4]. In order to overcome the time lag, X-rays were suggested to supply starting electrons artificially in the moment of voltage application [5][6]. As continuous X-rays can have negative impact on PD mechanism and measurements, ultrashort X-ray pulses were found to overcome the limits of continuous X-rays [7][8].…”