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

Li, Qi; Rowland, S. M.; Dupere, Iain; Morris, Richard S.

doi:10.1109/tpwrd.2018.2825886

Cited by 19 publications

(15 citation statements)

References 37 publications

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“…When the rain droplet is under the electric field, the electric field force drives the movement and deformation of the rain droplet, which leads to the distortion of the field strength and changes the size of the electric field force [18,19]. The interaction between the two is a coupling problem of electricity and fluid dynamics, which is defined as electrohydrodynamics.…”

Section: Numerical Simulation Using the Finite Element Methods (Fem)mentioning

confidence: 99%

The Dynamic Behaviour of Multi-Phase Flow on a Polymeric Surface with Various Hydrophobicity and Electric Field Strength

Liu

et al. 2022

Polymers

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The dynamic behaviour of rain droplets on the insulator surface is a key measure to its reliability and performance. This is due to the fact that the presence and motion of rain droplets cause intensive discharge activities, such as corona and low current arcing, which accelerate the ageing process and flashovers. This article aims to investigate and characterize the movement of a rain droplet placed on an inclined insulator surface subject to an intensive electric field. The rain droplets’ movement on hydrophobic surfaces in the absence of an electric field is investigated. A high speed camera is used to capture the footage and finite element method (FEM) is used to simulate the multi-physics phenomenon on two polymeric surfaces, namely, silicon rubber (SiR) and PTFE (polytetrafluoroethylene). A ‘creepage’ motion was observed. The inception of motion and the movement speed are analysed in correlation with various surface conditions. Models are established to estimate the moisture and potential discharge characteristics on the inclined polymeric surfaces. They are further utilized to analyse the actual insulators subject to wet conditions.

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Section: Numerical Simulation Using the Finite Element Methods (Fem)mentioning

confidence: 99%

The Dynamic Behaviour of Multi-Phase Flow on a Polymeric Surface with Various Hydrophobicity and Electric Field Strength

Liu

et al. 2022

Polymers

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“…ð11Þ where e z is a unit vector in the z-direction. According to Figure 8, R < h and |h-R|→0, then Substituting into (9) thus yields…”

Section: Explanations For Variations Of Magnitude and Position Of The Maximum Electric Fieldmentioning

confidence: 97%

“…A simulation can accurately describe the dynamic deformation laws of pendant water drops under different influencing factors, which is difficult to carry out in the experiment. Besides, most simulation research studies on discharges are based on electric field analysis [9,10].…”

mentioning

confidence: 99%

Effects of dynamic deformation of pendant water drops on the electric field between hollow porcelain insulator sheds under extreme rainfall

et al. 2021

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Hollow porcelain insulators in substations are frequently confronted with rain flashovers under extreme rainfall. This study aims to investigate the spatial and temporal variation of electric fields between hollow porcelain insulator sheds affected by dynamic deformation of pendant water drops and effects of the dimensionless number of fluids, the Weber number (We) and the electric Bond number (Bo E ), on it for influencing factors' analysis. Flowelectric field coupling simulations were carried out to compute the magnitude and the position of AC electric fields between the sheds. The results show that the maximum electric field at a point in time (E tmax ) increases significantly after the breakup of the pendant water drop, and its position alters accordingly. For low We and Bo E , the global maximum electric field (E gmax ) increases with increasing We and Bo E , respectively. It is much closer to the adjacent sheds and occurs later than E tmax at the breakup of the pendant water drop (E bmax ). By contrast, E gmax decreases in different degrees at high We and Bo E , respectively. There is little difference between E gmax and E bmax in the position and the occurring time. The influence mechanism on the maximum electric field and discharges and the relationship between discharges induced by the pendant water drop and rain flashover are discussed. K E Y W O R D S dynamic deformation, electric field, hollow porcelain insulators, pendant water drop, rain flashoverThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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“…3a-c. Only two cycles of the waveforms are given in these figures. The de-noised waveforms of AN are obtained on the basis of de-noised method in [18]. Through the de-noised method, the background noise and reflection noise from laboratory can be effectively removed.…”

Section: Basic Characteristics Of An From Ac Corona Dischargementioning

confidence: 99%

“…Besides, when the conductor is under the wet condition, water droplets will accumulate on the surface of the conductor. The water droplets experience the dynamic deformation and vibration due to the AC electrostatic force [18]. The vibration of water droplets can also act as acoustic sources of the tones emission.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

et al. 2018

High Voltage

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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.

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

Cited by 19 publications

References 37 publications

The Dynamic Behaviour of Multi-Phase Flow on a Polymeric Surface with Various Hydrophobicity and Electric Field Strength

The Dynamic Behaviour of Multi-Phase Flow on a Polymeric Surface with Various Hydrophobicity and Electric Field Strength

Effects of dynamic deformation of pendant water drops on the electric field between hollow porcelain insulator sheds under extreme rainfall

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

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