Comparison between the audible noises generated from single corona source under DC and AC corona discharge

Li, Xuebao; Cui, Xiang; Lu, Tiebing; Wang, Donglai; Ma, Wenzuo; Bian, Xingming

doi:10.17775/cseejpes.2015.00031

Cited by 21 publications

(5 citation statements)

References 17 publications

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“…The electric field intensity distribution on the surface of the SR sample was also obtained and shown in figure 3. Considering the drift and absorption of the space charge under AC corona [22][23][24][25], we think that electric field induced by the applied voltage would play a more important role than the space charge. So, the space charges formed by corona were not included in the simulation model.…”

Section: Ac Corona Agingmentioning

confidence: 99%

Dielectric loss prediction of silicone rubber after moisture absorption under AC corona

Yuan¹,

Tu²,

Jiang³

et al. 2018

J. Phys. D: Appl. Phys.

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Silicone rubber (SR) is widely used in HVDC/HVAC external insulation equipment because of its excellent electrical insulation performance and good hydrophobicity. In this paper, the variation of dielectric loss of SR after moisture absorption under AC coronas of 8.1 kV cm −1 , 10.8 kV cm −1 , 13.5 kV cm −1 , 16.2 kV cm −1 , 18.8 kV cm −1 and 21.6 kV cm −1 was investigated, respectively. Then, an equivalence equation of time and electric field intensity of corona, which was inspired by a time-temperature equivalence principle, was put forward. The test results verified the validity of the equivalence equation of time and electric field intensity of AC corona in describing the trend of dielectric loss of SR after moisture absorption under AC corona. At last, the aging time, reaching different dielectric losses of SR after moisture absorption under AC coronas of 10.0 kV cm −1 , 15.0 kV cm −1 and 20.0 kV cm −1 , was predicted. This study would help to guide the operation and maintenance of the silicone rubber on external insulation equipment.

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Section: Ac Corona Agingmentioning

confidence: 99%

Dielectric loss prediction of silicone rubber after moisture absorption under AC corona

Yuan¹,

Tu²,

Jiang³

et al. 2018

J. Phys. D: Appl. Phys.

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“…The measured time-domain waveform consists of random sound pressure pulses with some fluctuations. And it should be the superposition of the corona-generated sound pressure pulses, background noise and reflection sound from the ground, 22 which can be expressed as…”

Section: A the De-noising Of The Measured Audible Noise In Time-domainmentioning

confidence: 99%

Propagation characteristics of audible noise generated by single corona source under positive DC voltage

Cui

et al. 2017

AIP Advances

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The directivity and lateral profile of corona-generated audible noise (AN) from a single corona source are measured through experiments carried out in the semi-anechoic laboratory. The experimental results show that the waveform of corona-generated AN consists of a series of random sound pressure pulses whose pulse amplitudes decrease with the increase of measurement distance. A single corona source can be regarded as a non-directional AN source, and the A-weighted SPL (sound pressure level) decreases 6 dB(A) as doubling the measurement distance. Then, qualitative explanations for the rationality of treating the single corona source as a point source are given on the basis of the Ingard’s theory for sound generation in corona discharge. Furthermore, we take into consideration of the ground reflection and the air attenuation to reconstruct the propagation features of AN from the single corona source. The calculated results agree with the measurement well, which validates the propagation model. Finally, the influence of the ground reflection on the SPL is presented in the paper.

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“…Test wires are placed in the center of the corona cage, and unipolar or bipolar wires are used to simulate transmission lines for DC [4,5] and single-phase wires for AC [6,7]. As the distance between the cage wall and the wire is closer than the distance Energies 2023, 16, 4564 2 of 15 between the line and the ground, a lower voltage is applied to the wire, and the field strength of the wire surface can also reach the surface field strength level of the actual line at a higher voltage level, thus showing the corona characteristics of the transmission line at higher voltage levels. Cage experiments have been well proven to be an effective way to study the environmental impact of transmission lines [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…It can be challenging to infer waveform information in the temporal mode from spectral measurements for corona noise with broadband characteristics. Temporal measurements provide unprocessed AN waveforms while retaining the detailed characteristics of the acoustic waveform, aiding the study of the mechanism of corona discharge AN [16]. On the other hand, the frequency domain characteristics can be obtained from the temporal signal calculation using signal analysis methods.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Method Assisted Audible Noise Detection for Overhead Line Conductors Using the Cage Experiment

Meng

et al. 2023

Energies

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Audible noise (AN) has been the main concern in recent years when considering electromagnetic environmental impact in designing overhead lines (OHLs). Driven by the increased demand of high voltage direct current (HVDC) transmission lines, a novel corona cage experiment is built in association with an acoustic simulation using the finite element method (FEM). The characteristics of the acoustic wave propagation within the testing hall are analyzed using FEM, and the optimized locations for AN detection are determined. On the basis of complying with measurement standards, the location of the measurement is selected to be closer to the sound source and further away from the reflecting surface, to generate more accurate measurement results. In the designated test hall for this paper, the influence of refraction and reflection of sound waves is not obvious. The attenuation of sound waves below 4 kHz is negligible, while for higher frequencies such as 4 kHz and 8 kHz it is significant. Finally, FEM simulation is used to optimize the location for measurement microphones, and further experiments are carried out to verify its accuracy.

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Comparison between the audible noises generated from single corona source under DC and AC corona discharge

Cited by 21 publications

References 17 publications

Dielectric loss prediction of silicone rubber after moisture absorption under AC corona

Dielectric loss prediction of silicone rubber after moisture absorption under AC corona

Propagation characteristics of audible noise generated by single corona source under positive DC voltage

Finite Element Method Assisted Audible Noise Detection for Overhead Line Conductors Using the Cage Experiment

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