Spectral Characteristics of Acoustic Noise from Metallic Protrusions and Water Droplets in High Electric Fields

Ianna, F.; Wilson, Gerald L.; Bosack, D. J.

doi:10.1109/tpas.1974.293830

Cited by 24 publications

(23 citation statements)

References 3 publications

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“…As discovered by F. Ianna et al in 1974 [6], strong correlation was found between current pulse frequency and the predominant frequency bands in the audible noise as well as radio interference. So the spectrum analysis of the two kinds of Trichel pulses can make a guidance of the researches in AN and RI caused by the transmission lien corona discharges.…”

Section: Spectrum Analysismentioning

confidence: 63%

The detailed characteristics of negative corona discharge pulse

Zhang

2014

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS)

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Trichel pulse is a typical negative corona current with a high regular form, its detailed characteristics has not been discussed. Moreover, the differences in a train of Trichel pulses also have significant influence on the spectrum of the pulsatile corona current and thus the audible noise and radio interference. In this paper, a serious of experiment was conducted on a scale model of transmission line to investigate the detailed characteristic of the difference in a train of Trichel pulses. Based on the thorough analysis of the experimental data, the difference between the first pulse and the rest pulses of a train of Trichel pulses were amply described.

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Section: Spectrum Analysismentioning

confidence: 63%

The detailed characteristics of negative corona discharge pulse

Zhang

2014

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS)

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“…A further classic experiment by Taylor quantified the maximum vertex angles developed before a liquid surface becomes unstable (resulting in ejection of small jets of fluid) [14]. Being inspired by Taylor's cone, a number of researchers conducted further investigations on this electro-hydrostatic phenomenon [15][16][17][18][19][20][21][22][23].…”

Section: Literature Reviewmentioning

confidence: 99%

The Impact of Water Droplet Vibration on Corona Inception on Conductors Under 50 Hz AC Fields

Rowland

Dupere

et al. 2018

IEEE Trans. Power Delivery

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Abstract--The relationship between the size of water droplets on the surface of AC high voltage conductors, their vibration and corona onset is investigated. Measurements have been carried out on individual droplets in high voltage experiments, including high speed photography, and discharge inception measurements. These have been correlated with acoustic emission from larger arrays of droplets on overhead transmission line conductors. A numerical model based on the finite element method has also been developed to simulate the vibration of the droplet enabling evaluation of the electric field and the characteristics of the droplet vibration. It is shown that the size of water droplet is critical in its mechanical response to the field and that corona does not necessarily occur when the droplet is deformed into its most conical state as is the case under DC fields. For larger droplets the phase shift between field and droplet vibration results in the maximum field occurring when the droplet is in a 'flattened' profile rather than when it is 'pointed'. The phase relationship between the droplet vibration and the electric field thus controls the onset of corona. It is argued that conductors which facilitate the development of small, uniform, stable droplets on their surface are the cause of abnormally high levels of low-frequency audible noise sometimes observed by transmission utilities. Moreover the narrow resonant response of the droplet may lead to a difference in acoustic emissions experienced between power utilities with 50 Hz and 60 Hz system frequencies.

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“…Most of the previous experimental investigations were mainly based on frequency-domain measurement [4][5][6][7]. The frequency-domain results were integrated effects of the repetitive audible noise pulses, and they could hardly reflect the pulse characteristics and the generation mechanism of the audible noise.…”

Section: Introductionmentioning

confidence: 99%

“…It should be pointed out that noise in audible frequency range i.e. 20 Hz-20 kHz is mainly concerned in order to protect the human health in the evaluation of audible noise from HVDC transmission lines, although the noise caused by DC corona discharge may contain ultrasonic components [4].…”

Section: Introductionmentioning

confidence: 99%

Time-domain characteristics of the audible noise generated by single corona source under positive voltage

Cui

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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This paper aims to investigate time-domain characteristics of the audible noise caused by single corona source under positive corona discharge. The obtained time-domain waveform of the audible noise consisted of a series of bipolar sound pressure pulses. After the background noise was successfully removed, the characteristics of audible noise pulses, such as amplitudes of each pulse, pulse rate and apparent duration time, were analyzed in this paper. Using the applied voltage and the onset voltage as variables, empirical formulas were derived from the measured results to predict the pulse rate and the amplitudes of the pulses. Furthermore, a typical waveform in the form of segmented double exponential function was developed to simulate the audible noise pulse. The rationality of the typical waveform was confirmed both in time domain and in frequency domain. Finally, some qualitative explanations for the generation of the bipolar pulse waveform of audible noise were given. Based on the remaining space charges characteristics, the influences of the applied voltage on the amplitude and pulse rate of the audible noise pulses were studied qualitatively.

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Spectral Characteristics of Acoustic Noise from Metallic Protrusions and Water Droplets in High Electric Fields

Cited by 24 publications

References 3 publications

The detailed characteristics of negative corona discharge pulse

The detailed characteristics of negative corona discharge pulse

The Impact of Water Droplet Vibration on Corona Inception on Conductors Under 50 Hz AC Fields

Time-domain characteristics of the audible noise generated by single corona source under positive voltage

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