Static electrification in power transformers: Correlation between charge generation and ECT-tanδ parameters for different oil-pressboard couples

Touchard, G.; Mas, P.; Paillat, T.; Moreau, O.

doi:10.1109/icdl.1999.798956

Cited by 14 publications

(7 citation statements)

References 2 publications

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“…Although the streaming electrification characteristics of flowing mineral oil in a transformer have been reported for a long time, data for silicone oil is scarce [4][5][6][7][8]. So, as part of a basic study, we have investigated the streaming electrification characteristics of flowing silicone oil at room temperature and studied the series for streaming electrification of insulators obtained from the differences between the equivalent work functions of the insulators [9].…”

Section: Introductionmentioning

confidence: 98%

Effect of temperature on the streaming electrification characteristics of silicone oil

Ishikawa

Yasuda

Igarashi

et al. 2009

IEEE Trans. Dielect. Electr. Insul.

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We have investigated the performance of silicone oil as an insulating medium with the aim of developing environmentally-friendly, flame-retardant electric power equipment. We have studied the streaming electrification characteristics of silicone oil during flow, with regard to its use in the cooling of electric power equipment, at temperatures from 30 to 130 °C. The effects of the insulator material on the charge density in the oil and on the accumulated charge density in the insulator were investigated. We use four kinds of insulators, including aramid paper, in these experiments. The silicone oil was negatively charged by streaming electrification, in contrast to conventional mineral oil. The magnitude of the accumulated charge density in the insulator was influenced by the kind of insulator. It was also found that the charge density in the silicone oil and the accumulated charge density in the insulator changed with increasing temperature. Moreover, we investigated the effect of the kinematic viscosity on the streaming electrification by performing experiments using oils with kinematic viscosities of 20 cSt and 50 cSt. We have considered the optimum combinations of silicone oil and insulator material.

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Section: Introductionmentioning

confidence: 98%

Effect of temperature on the streaming electrification characteristics of silicone oil

Ishikawa

Yasuda

Igarashi

et al. 2009

IEEE Trans. Dielect. Electr. Insul.

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“…To date, the streaming electrification characteristics have been investigated using mineral oil [4][5][6][7][8]. However, there exists no comparable information for silicone oil.…”

Section: Introductionmentioning

confidence: 99%

“…However, the Kyoto Protocol has designated SF 6 , as one of the greenhouse gases to be restricted. Because the global warming potential (GWP) of SF 6 gas is very high, there has been considerable research into alternative gases.…”

Section: Introductionmentioning

confidence: 99%

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Streaming Electrification Characteristics of Silicone Oil

Nakajima

Miyahara

Ishikawa

et al. 2008

IEEE Trans. Dielect. Electr. Insul.

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We present a study of the performance of silicone oil as an environmentally friendly and flame retardant insulating medium for electric power equipment. We have investigated the streaming electrification characteristics for flowing silicone oil for cooling of electric power equipment. As the initial step, the electric charge density accumulated in silicone oil and on the surface of the insulator is investigated simultaneously. We have used 5 types of insulating material for the experiment, including aramid paper. Silicone oil becomes negatively charged by streaming electrification, in contrast to conventional mineral oil, and the magnitude of the electric charge density on the insulating material is influenced by the kind of insulating material. As the second step, the streaming electrification characteristics of silicone oil were further examined using an insulator for which the work function is known. Based on these results, streaming electrification for various kinds of insulator and silicone oil is evaluated with respect to the work function. We consider the optimum combination of silicone oil and insulating material.

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“…As regards the aging of pressboard (PB) insulators, French researchers report that aged PB has a higher electric charge [3]; however, there are too few field data on the effect of PB aging.…”

Section: Introductionmentioning

confidence: 99%

Increase of static electrification in an aged oil‐immersed transformer

Kobayashi

Yajima

Yamada

et al. 2009

Electrical Engineering Japan

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Background We investigated the potential for selection bias due to non‐participation in the follow‐up of a large prospective cohort study. Methods Licensed pesticide applicators (52,395 private; 4,916 commercial) in the Agricultural Health Study provided demographic, health, and pesticide exposure information at enrollment (1993–1997) and in a 5‐year follow‐up telephone interview. Factors associated with non‐participation in the follow‐up were identified using multiple logistic regression. Potential for selection bias was evaluated by comparing exposure–disease associations between the entire cohort and the follow‐up subset. Results Sixty‐six percent of private and 60% of commercial applicators completed the follow‐up interview. Private and commercial applicators who did not complete the follow‐up reported at enrollment younger age, less education, lower body mass index, poorer health behaviors but fewer health conditions, and lower pesticide use. Estimates of exposure–disease associations calculated with and without non‐participants did not indicate strong selection bias. Conclusions Differences between non‐participants and participants in the follow‐up interview were generally small, and we did not find significant evidence of selection bias. However, the extent of bias may depend on the specific exposure and outcome under study. Am. J. Ind. Med. 53:486–496, 2010. © 2009 Wiley‐Liss, Inc.

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Static electrification in power transformers: Correlation between charge generation and ECT-tanδ parameters for different oil-pressboard couples

Cited by 14 publications

References 2 publications

Effect of temperature on the streaming electrification characteristics of silicone oil

Effect of temperature on the streaming electrification characteristics of silicone oil

Streaming Electrification Characteristics of Silicone Oil

Increase of static electrification in an aged oil‐immersed transformer

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