NDLI: The fast and slow signal components of partial discharges in SF/sub 6/ measurements of the electron and ion contributions to PD-signal

Content Provider	IEEE Xplore Digital Library
Author	Herbst, I. Pietsch, R.
Copyright Year	1994
Description	Author affiliation: ABB High Voltage Technol., Zurich, Switzerland (Herbst, I.)
Abstract	For many years the IEC 270 partial discharge (PD) measurement technique has been the international standard. To improve the ratio of PD signal to thermal amplifier noise and to reduce sensitivity to external noise, "ultra"-wideband techniques have been proposed as an alternative to IEC 270. This paper will show that in the absence of external noise the assumption of improved S/N is false and based on a general misconception of the PD signal characteristics. Partial discharge signals in gas-insulated systems (GIS) are usually said to be very fast signals in the nanosecond range, created by fast electrons. We measured not only a fast but also a slow signal component for a typical discharge source under normal GIS operating conditions. These signal components can be attributed to fast moving electrons and slow moving positive and negative ions. We found that the slow part of the PD pulse is 2-14 times larger than the electronic part (measured at 100 kHz, in IEC 270), and also that the ratio of these two parts depends strongly on pressure and geometry. Since the IEC 270 method integrates fast and slow signal components as well as the smaller consecutive pulses we find that the disadvantage of thermal noise is compensated for by the resulting increase in PD signal. Therefore the conventional technique can still be recommended in quality insurance testing of GIS.<>
Starting Page	283
Ending Page	287
File Size	502846
Page Count	5
File Format	PDF
ISBN	0780319427
ISSN	1089084X
DOI	10.1109/ELINSL.1994.401511
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-06-05
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Partial discharges IEC standards Geographic Information Systems Noise reduction Signal to noise ratio Electrons Pulse measurements Measurement techniques Measurement standards Partial discharge measurement
Content Type	Text
Resource Type	Article

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Determination of PD sensitivity of GIS using signal reduction measurements

Wavelet Packet Denoising of Partial Discharge Data

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Fundamental differences of the PD measurement according to IEC 60270 and in UHF range

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The fast and slow signal components of partial discharges in SF/sub 6/ measurements of the electron and ion contributions to PD-signal

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