Statistical analysis of audible noise generated by AC corona discharge from single corona sources

• Published in: High voltage Vol. 3; no. 3; pp. 207 - 216
• Main Authors: Li, Xuebao, Wang, Jing, Lu, Tiebing, Cui, Xiang
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 01.09.2018; Wiley
• Subjects: A-weighted sound pressure level; AC corona discharge; AC voltage modulation; acoustic noise; alternate current corona discharge; audible noise; corona; frequency-domain; frequency-domain analysis; instantaneous voltages; negative half cycle analysis; numerical analysis; numerical fitting method; positive half cycle analysis; pulse amplitude; Research Article; single corona sources; sound pressure pulses; SPL; statistical analysis; statistical distributions; stochastic processes; stochastic simulation method; time-domain analysis; time-domain waveforms; tones emission; A-weighted sound pressure level; alternate current corona discharge; AC voltage modulation; sound pressure pulses; statistical distributions; SPL; audible noise; pulse amplitude; instantaneous voltages; numerical analysis; single corona sources; stochastic processes; corona; frequency-domain; negative half cycle analysis; positive half cycle analysis; time-domain analysis; time-domain waveforms; frequency-domain analysis; AC corona discharge; numerical fitting method; tones emission; stochastic simulation method; statistical analysis; acoustic noise
• ISSN: 2397-7264; 2397-7264
• DOI: 10.1049/hve.2017.0159

Time-domain waveforms of sound pressure pulses generated by alternate current (AC) corona discharge from single corona sources are measured. The pulse amplitude and time interval of sound pressure pulses in positive and negative half cycles are analysed separately due to large differences of the sound pressure pulses in positive and negative half cycles. The influences of instantaneous voltages on the pulse amplitude and time interval are obtained, and statistical distributions of pulse amplitude and time interval are also obtained. Besides, empirical formulas of the pulse amplitude and time interval are derived by numerical fitting method. Based on the statistical results, stochastic simulation of the sound pressure pulses is conducted, and the validity of the simulated results is given by comparing the frequency-domain results and A-weighted sound pressure level (SPL) with the measured ones. Finally, the stochastic simulation method is used to discuss modulating influence of AC voltage on the tones emission from AC corona discharge. Besides, the influence of the measurement time on the resultant SPL is also discussed on the basis of the stochastic model. In order to insure the SPL independent of the measurement time, the measurement time should be larger than 0.2 s.