The effect of partial discharge by-products on the dielectric frequency response of oil-paper insulation comprising of a small cavity

Kiiza, Respicius Clemence; Niasar, Mohamad Ghaffarian; Nikjoo, Roya; Wang, X.; Edin, Hans

doi:10.1109/tdei.2015.004424

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…Many previous researchers have investigated void PDIE characteristics by theoretical derivations, finite element simulations, and model experiments. Some of their results are summarized in figure 4 [5,6,11,22,[26][27][28][29][30][31][32][33][34]. For the sake of comparison, we used field intensity rather than voltage data in this study.…”

Section: Estimation Of Inception Field Intensitymentioning

confidence: 99%

Critical study of partial discharge inception in voids: statistical behavior to stochastic nature

Zhang¹,

Zhang²,

Jing-en³

et al. 2021

J. Phys. D: Appl. Phys.

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Although many studies have been done and advanced progress has been made in understanding partial discharge (PD) behavior in the void, this is not the case firinception of PD, especially its stochastic nature. The statistical behaviors of PD inception voltage (PDIV) and inception time delay (PDTD) inside the void were investigated in this study through repeated tests to observe the stochastic nature of PD inception. The results show that the PDIV and PDTD of the void are highly dispersed and obey Weibull and exponential distributions, respectively. The significant dispersion of PDIV can be attributed to the statistical time delay of PD inception. The lengthy inception delay is attributable to a lack of free electrons. The exponential distribution of PDTD indicates that free-electron generation is completely random; further, the stochastic nature of void PD inception is determined by the supply of free electrons. The test method (voltage rise rate, test time, and test time interval), void parameters (size, material, and surface condition), and background radiation determine PD inception by affecting the volume ionization or surface-emission process providing free electrons. Enhanced background ionization or significant increase in test voltage and test time allow for the effective detection of void defects during PD tests. This work contributes to an empirical understanding of the physical process of PD inception in voids and improving existing PD testing technologies.

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Section: Estimation Of Inception Field Intensitymentioning

confidence: 99%

Critical study of partial discharge inception in voids: statistical behavior to stochastic nature

Zhang¹,

Zhang²,

Jing-en³

et al. 2021

J. Phys. D: Appl. Phys.

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show abstract

“…The breakdown of turn-to-turn insulation occurs occasionally, and a failed transformer is difficult to repair. The aging of oil-immersed paper insulation is influenced by the electric field, temperature, moisture, oxygen, and other factors [6][7][8][9]. Among these factors, the damage caused by electrical aging cannot be ignored [10,11].…”

Section: Introductionmentioning

confidence: 99%

A Study of Electrical Aging of the Turn-to-Turn Oil-Paper Insulation in Transformers with a Step-Stress Method

et al. 2018

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This study investigates the electrical aging characteristics of oil-paper composite insulation. In this paper, a coils model and test system for oil-paper transformer insulation are designed. The electrical aging tests of the model coils at room temperature and operating temperature are performed using the step-stress method. A new method for estimating the unknown parameters in the inverse power exponent model is proposed, and the inverse power model life formula expressed by voltage and electric field strength is obtained. Considering the electrical aging process at the operating temperature, the allowable field strength of the inter-turn insulation of oil-immersed transformers can be improved. The new parameter estimation method proposed in this paper can be used to calculate the unknown parameters of the step-stress solid insulation aging model. This method has a clear physical meaning and can be solved easily. When the stressed voltage is below a certain threshold value, the life of the transformer coil turn-to-turn insulation grease oiled paper model is longer at operating temperatures compared with that at room temperature; when the voltage is higher than the threshold, it presents the opposite tendency.

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Influence of Partial Discharge on Dissipation Factor Measurement at Very Low Frequency

Morsalin

Phung

Danikas

2018

2018 Condition Monitoring and Diagnosis (CMD)

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The effect of partial discharge by-products on the dielectric frequency response of oil-paper insulation comprising of a small cavity

Cited by 5 publications

References 26 publications

Critical study of partial discharge inception in voids: statistical behavior to stochastic nature

Critical study of partial discharge inception in voids: statistical behavior to stochastic nature

A Study of Electrical Aging of the Turn-to-Turn Oil-Paper Insulation in Transformers with a Step-Stress Method

Influence of Partial Discharge on Dissipation Factor Measurement at Very Low Frequency

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