Theory and Application of Pulsed X-ray Induced Partial Discharge Measurements for HV-Equipment
نویسنده
چکیده
The statistical time lag of partial discharge (PD) inception was eliminated by using short X-ray pulses (duration 50 ns) for triggering. It was shown that the X-ray pulses provide the necessary start electrons to start an avalanche by gas ionisation. Phase resolved PD (PRPD) measurements were performed at low electric field levels with self-produced spherical voids in epoxy samples. Even very small voids were detected without statistical time lag and no significant difference between the PRPD patterns after X-ray pulse triggering and naturally incepted PDs was observed. A minimum X-ray dose which is needed to provide at least one start electron in the void for successful PD inception was experimentally determined. Further, in order to study the effect of the X-ray pulse on the triggering and on the discharge mechanism, time-resolved PD measurements with an ultra-wideband detection circuit were made. Particular emphasis was placed on the effect of the X-ray dose on the PD mechanism and its differences to a naturally incepted PD without X-ray application.
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Pulsed X-ray Induced Partial Discharge Measurements (pxipd)
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