Reduction of audible noise using asymmetrical bundles for 1000 kV transmission lines: full-scale test results of Akagi test line

Tanabe, Kazuo; Takebe, T.; Isozaki, Masanori

doi:10.1109/61.517507

Cited by 18 publications

(11 citation statements)

References 8 publications

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“…In this case of a monopole, no additional term for the near field exists. This is different if one inserts the 'force' source (15) in (13), which results in…”

Section: Solutions Of the Wave Equationmentioning

confidence: 98%

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Mechanism of the tonal emission from ac high voltage overhead transmission lines

Straumann¹

2011

J. Phys. D: Appl. Phys.

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Foul weather conditions can lead to corona discharges on high voltage overhead transmission lines which are perceivable as an audible broadband crackling and hissing noise. In such situations this noise is often accompanied by a humming noise at twice the mains frequency (2f). While the crackling and hissing noise component was widely investigated in the past, the 2f-component went largely uncommented. Only a scant amount of literature suggests mechanisms explaining the occurrence of this emission, but these suggestions are either vague or controversial. In this paper a mechanism analogous to that of ion loudspeakers is presented, which describes the sound levels of audible 2f-emissions from high voltage model lines quantitatively in a satisfactory manner. While the broadband component of corona noise emissions has its immediate origin in the discharges themselves, the 2f-emissions arise from the drift of ions left behind by the discharges. Due to collisions with gas molecules, these ions cause in the sum a rise of heat in and a force applying on the neutral gas, thus producing the 2f-emissions. Depending on the situation, both can give rise to contributions of similar magnitude.

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“…In this case of a monopole, no additional term for the near field exists. This is different if one inserts the 'force' source (15) in (13), which results in…”

Section: Solutions Of the Wave Equationmentioning

confidence: 98%

“…In some of the vast amount of literature on audible noise from corona, the 2f -component was noted passim [5][6][7][8][9][10][11][12][13]. However, as it only contributes a minor share to the A-weighted level, the low-frequency tonal noise went largely unnoticed or uncommented.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of the tonal emission from ac high voltage overhead transmission lines

Straumann¹

2011

J. Phys. D: Appl. Phys.

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“…In this study, we build on the work of Miyajima and Tanabe [33] and focus on assessing whether the use of a superhydrophobic coating on an overhead line conductor will decrease audible noise. Using a semi-anechoic chamber, an analysis of audible noise in the frequency domain-with a focus on low-frequency hum-is made for multiple types of conductors that are treated with a superhydrophobic coating.…”

Section: Introductionmentioning

confidence: 99%

Experimental verification of the potential of superhydrophobic surfaces in reducing audible noise on HVAC overhead line conductors

Zhang

Cotton

et al. 2022

High Voltage

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Overhead line conductors can generate audible noise across a wide frequency spectrum as a result of elevated electric fields at the conductor surface. Such fields are enhanced by the presence of surface defects, insects, water drops and pollution. Within this paper, the impact of a superhydrophobic coating on the audible noise produced by an overhead line conductor is examined. Noise levels from a conductor coated with a superhydrophobic coating were compared to those from a bare conductor in a semi‐anechoic chamber. The conductors were energised at voltages to provide surface electric fields ranging from 6 kV/cm to 21 kV/cm (rms). With a continuous water spray system depositing droplets on the conductor surface, the frequency domain sound pressure level, overall sound pressure levels and corona discharge magnitude were measured. It is demonstrated that the use of a superhydrophobic coating reduced audible noise levels and corona discharge magnitude, especially at electric fields above 14 kV/cm. The image analysis suggests that the water drop size distribution and the position of surface droplets on the conductor circumference play an important role in the magnitude of audible noise.

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“…So a great deal of work has been done around the AN from UHV transmission lines [1][2][3]. Now the main study is concentrated on the AN measurement of different lines [4][5][6], such as working transmission lines, UHV test lines, UHV corona cage. Based on these test data, different prediction methods and formulas of corona audible noises have been developed for both ac and dc systems.…”

Section: Introductionmentioning

confidence: 99%

Analysis of sound characteristics produced by high voltage discharges under DC and pulsed voltages

Ren

Wang

Yan

et al. 2015

2015 IEEE Pulsed Power Conference (PPC)

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The mechanism of audible noise caused by corona discharge of UHV transmission lines is not well resolved. The sound characteristic produced by discharge is the foundation to analyze the intrinsic relation of audible noise and corona discharge. The experiment of sing point corona discharge under DC voltage was developed and the sound pressure produced by corona discharge was measured. The sound pressure in time domain was measured by capacitor microphone. The research results indicate the corona discharges in DC voltage are composed of a series of single discharge pulses. The rising edge and pulse width of single discharge pulse have relation to discharge voltage and electrode polarity. The corona discharge produces the sound pressure with a microsecond pulse lagging behind the single discharge pulse in their waveforms. The time delay between current pulse and sound pulse is mainly caused by sound propagation time from discharge spot to measurement spot. The nanosecond pulsed discharge platform was set up to study the relation of discharge parameter and sound characteristic. The sound pressure waveforms in different discharge parameters were obtained. Experiment results showed that pulsed discharge produce the similar sound pressure with corona discharge. The pulsed discharge platform could be used to study the mechanism of audible noise caused by corona discharge.

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Reduction of audible noise using asymmetrical bundles for 1000 kV transmission lines: full-scale test results of Akagi test line

Cited by 18 publications

References 8 publications

Mechanism of the tonal emission from ac high voltage overhead transmission lines

Mechanism of the tonal emission from ac high voltage overhead transmission lines

Experimental verification of the potential of superhydrophobic surfaces in reducing audible noise on HVAC overhead line conductors

Analysis of sound characteristics produced by high voltage discharges under DC and pulsed voltages

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