Surface Breakdown Characteristics of Silicone Oil for Electric Power Apparatus

Wada, Junichi; Nakajima, A.; Miyahara, Hideyuki; Takuma, Tadasu; Okabe, S.; Kohtoh, M.; Yanabu, S.

doi:10.1541/ieejpes.125.1216

Cited by 6 publications

(9 citation statements)

References 6 publications

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“…du Pont de Nemours and Company). We have investigated the insulating properties of silicone oil itself for applications to electric power equipment [2,3].…”

Section: Introductionmentioning

confidence: 99%

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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“…du Pont de Nemours and Company). We have investigated the insulating properties of silicone oil itself for applications to electric power equipment [2,3].…”

Section: Introductionmentioning

confidence: 99%

Streaming Electrification Characteristics of Silicone Oil

Nakajima

Miyahara

Ishikawa

et al. 2008

IEEE Trans. Dielect. Electr. Insul.

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“…We previously verified that the breakdown strength in silicone oil for various insulation compositions is influenced by the SOV magnitude [3,6]. In the filler and improved filler models in which the filler or insulator Nomex ® touches the high-voltage electrode, the ratio between the BDV and E max differs, as shown in Figures 8 and 11.…”

Section: Consideration Of Stressed Oil Volume (Sov)mentioning

confidence: 63%

“…We previously investigated the surface breakdown characteristics of the TJ model, and verified that these are dependent on the E max of the TJ [6]. E max of the TJ is influenced by the relative permittivity of the insulator, and decreases when the relative permittivity of the insulator approaches that of silicone oil.…”

Section: Breakdown Strength Characteristics Of the Improved Filler Modelmentioning

confidence: 88%

“…A number of high-voltage gas-insulated switchgears have been installed that utilize compressed SF 6 , which has excellent insulating and arc-quenching properties. In electric power transformers, nonflammable SF 6 gas-insulated transformers are increasingly being applied instead of transformers containing mineral oil to prevent fires at indoor and underground facilities.…”

Section: Introductionmentioning

confidence: 99%

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Insulating System to Reduce the Amount of Oil in Electric Power Apparatus Using Silicone Oil

Miyahara

Nakajima

Ishikawa

et al. 2008

IEEE Trans. Dielect. Electr. Insul.

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The lightning impulse breakdown characteristics of various combinations of insulation material in silicone oil for use in electric power apparatus were investigated, with the aim of reducing the amount of oil required and thus the cost. Breakdown characteristics were investigated in a system in which an insulating filler was mixed with silicone oil. Tests were conducted on a sphere-plane electrode in a vertical arrangement and a sphere-sphere electrode in a horizontal arrangement. The relation between the breakdown strength and the electric field strength was clarified. Breakdown characteristics were also investigated in a system in which an insulator with low relative permittivity was inserted between a filler with high relative permittivity and the high-voltage electrode. Based on the findings, optimum conditions for the application of silicone oil to electric power equipment are proposed.

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“…Until now, we have investigated the insulating properties of silicone oil it self for the application to the electric power apparatus. [2,3] In this paper, we have investigated in consideration of the subject of the electric power apparatus also about the streaming electrification characteristics of insulating materials in the conditions through which silicone oil circulates. Until now, in the electric power transformer, the streaming electrification characteristics have been a problem and the characteristics in mineral oil have been investigated.…”

Section: Introductionmentioning

confidence: 99%