Time-continuous Kerr electro-optic field mapping measurement under impulse voltage using array photodetector

Sima, Wenxia; He, Suqin; Yang, Qing; Guo, Hongda; Zahn, M.; Yang, Ming

doi:10.1063/1.4929504

Cited by 13 publications

(10 citation statements)

References 10 publications

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“…Furthermore, the is relatively significant for its high Kerr constant. In our previous works, [10][11][12][13][14] Kerr electro-optic measurement method is applied to investigate the space charge behaviors in liquid dielectrics such as propylene carbonate and transformer oil. Based on the space charge measurement results, the physical mechanism of space charge's effect on the breakdown process of liquid dielectrics is presented.…”

Section: Introductionmentioning

confidence: 99%

Effect of the electrode material on the breakdown voltage and space charge distribution of propylene carbonate under impulse voltage

Yang

Sima

et al. 2016

AIP Advances

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This paper reports three types of electrode materials (copper, aluminum, and stainless steel) that are used to measure the impulse breakdown voltage of propylene carbonate. The breakdown voltage of propylene carbonate with these electrode materials is different and is in decreasing order of stainless steel, copper, and aluminum. To explore how the electrode material affects the insulating properties of the liquid dielectric, the electric field distribution and space charge distribution of propylene carbonate under impulse voltage with the three electrode materials are measured on the basis of a Kerr electro-optic test. The space charge injection ability is highest for aluminum, followed by copper, and then the stainless steel electrodes. Furthermore, the electric field distortion rate decreased in the order of the aluminum, copper, and then the stainless steel electrode. This paper explains that the difference in the electric field distortion rate between the three electrode materials led to the difference in the impulse breakdown voltage of propylene carbonate.

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Section: Introductionmentioning

confidence: 99%

Effect of the electrode material on the breakdown voltage and space charge distribution of propylene carbonate under impulse voltage

Yang

Sima

et al. 2016

AIP Advances

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“…Applying the theory of ion migration and introducing the equation of thermal diffusion, O'Sullivan modeled and analyzed the charge transfer process in liquid dielectric [7]. Drawing the finding from precious researches and based on the electric field measurement results in propylene carbonate, Sima et al established charge injection and migration model based on the theory of electric double layer [8]. Qi et al explored the polarity effect of the positive and negative charge accumulation at the oil-paper insulation interface through measuring the distribution of electric field under DC voltage, AC-DC combined voltage and polarity reversal voltage, and pointed out the limitations of the widely-used Resistive-Capacitive model (RC model) [9]- [11].…”

Section: Introductionmentioning

confidence: 99%

Electric Field Distribution Characteristics and Space Charge Motion Process in Transformer Oil Under Impulse Voltage

Gao

Han

et al. 2019

IEEE Access

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The electric field and space charge dynamics characteristics in oil under impulse voltage are key factors to the transformer insulation design, which are mainly obtained through simulation, falling short of experimental verifications. Applying the Kerr electro-optic method, the present paper carried out an actual measurement for the electric field characteristics in transformer oil under impulse voltage and managed to obtain their correlations with an electrode material, voltage amplitude, and wave-front time, respectively. First, it was found that, under impulse voltage and in pure transformer oil, the aluminum electrode had the largest amount of charge injection, followed by stainless steel and then copper, which was attributed to the different work functions of metal elements in electrodes. Second, with the increase of voltage amplitude, the effect of the space charge on the intermediate electric field of the oil gap was first enhanced, then weakened, and eventually enhanced. Third, as the wave-front time was prolonged, the peak of electric field in transformer oil showed a downward trend. For instance, the peak value of the electric field was reduced by 17.6 % when the wave-front time was increased from 0.5 µs to 40.0 µs. The reason is that when the wave-front time is longer, the amount of injected charge grows larger and the weakening effect becomes stronger. Fourth, a charge dynamic motion model in transformer oil under impulse voltage was established to demonstrate its spatial-temporal effects on the electric field. Besides, this paper has clarified the source of the negative and positive charges in the transformer oil under impulse voltage by using the theories of field emission and field ionization. Moreover, the variation of electron mobility over-voltage amplitude, wave-front time, and spatial distribution was worked out to present the quantitative results of its motion process.INDEX TERMS Electric field, distribution characteristics, charge motion process, electron mobility, transformer oil, impulse voltage.

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“…Moreover, repetitive impulses can result in the accumulation of space charge if the interval time is not long enough. An array photodetector (APD) with high sensitivity is introduced in the measurement by our group to overcome these drawbacks [6,7]. Owing to the high time-resolution advantages of APD, we can obtain space charge distribution under a single impulse voltage and the random error and accumulative error are effectively avoided.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric injection and distribution of space charges in propylene carbonate under impulse voltage

Sima¹,

Chen²,

Sun³

et al. 2018

J. Phys. D: Appl. Phys.

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Space charge can distort the electric field in high voltage stressed liquid dielectrics and lead to breakdown. Observing the evolution of space charge in real time and determining the influencing factors are of considerable significance. The spatio-temporal evolution of space charge in propylene carbonate, which is very complex under impulse voltage, was measured in this study through the time-continuous Kerr electro-optic field mapping measurement. We found that the injection charge from a brass electrode displayed an asymmetric effect; that is, the negative charge injection near the cathode lags behind the positive charge injection near the anode. Physical mechanisms, including charge generation and drift, are analyzed, and a voltage-dependent saturated drift rectification model was established to explain the interesting phenomena. Mutual validation of models and our measurement data indicated that a barrier layer, which is similar to metal-semiconductor contact, was formed in the contact interface between the electrode and propylene carbonate and played an important role in the space charge injection.

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Time-continuous Kerr electro-optic field mapping measurement under impulse voltage using array photodetector

Cited by 13 publications

References 10 publications

Effect of the electrode material on the breakdown voltage and space charge distribution of propylene carbonate under impulse voltage

Effect of the electrode material on the breakdown voltage and space charge distribution of propylene carbonate under impulse voltage

Electric Field Distribution Characteristics and Space Charge Motion Process in Transformer Oil Under Impulse Voltage

Asymmetric injection and distribution of space charges in propylene carbonate under impulse voltage

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