NDLI: Characteristics of negative corona discharge using CWT with and without airflow

Content Provider	IEEE Xplore Digital Library
Author	Ichikawa, N. Okumura, K. Takahashi, Y.
Copyright Year	1994
Abstract	The Trichel pulse (TP) corona generated in the negative corona discharge has a regular interval and repetition of similar waveforms in nonuniform electric field in a needle-plane gap. An electron avalanche causes the TP. Its repetition is determined by accumulation of negative ions near a needle tip. The electric field intensity near a needle tip is weakened by the negative ions accumulated near the tip. Hence, it is required to clarify the influence of accumulated negative ions on the electric field intensity. We propose to use the continuous wavelet transformation (CWT) technique to study the dependence on both voltage and airflow, and the characteristics of the TP. In this study, the waveform of the TP is measured with a velocity of airflow from 0 to 7 m/s. From the experimental results, it is shown that the region of accumulated negative ions exists within 1 mm from the tip of needle electrode. Therefore, to understand the effect of accumulated negative ions near a needle tip, the authors investigated the influence of accumulated negative ions with and without airflow blown within 1 mm from the tip of the needle electrode using CWT. The repetition rate decreases with decreasing the applied voltage, and with increasing the velocity of airflow in front of the needle tip. The wavelet coefficients with airflow are larger than without airflow at 100 and 250 MHz; but 10 MHz, and the pulse interval for the wavelet spectrum between peaks with airflow is wider than without airflow. The characteristics of the TP waveform are well explained with both the wavelet coefficient and the averaged wavelet spectrum peak interval
Sponsorship	National Natural Science Foundation of China (NSFC) Region Centre Ville de Tours Conseil General D'Indre et Loire ABB IEEE Sandia National Laboratories TOSHIBA
Starting Page	34
Ending Page	40
Page Count	7
File Size	1068540
File Format	PDF
ISSN	10709878
Volume Number	12
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Corona Continuous wavelet transforms Needles Voltage Electrodes Wavelet coefficients Pulse generation Nonuniform electric fields Electrons Velocity measurement
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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