Comparison of streaming electrification characteristics between an ester liquid and a mineral oil using rotating disc method

Liu, Q.; Liu, Z.; Yang, Guang

doi:10.1109/ceidp.2013.6748315

Cited by 3 publications

(5 citation statements)

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“…For the mineral oil, thermal aging facilitates the charge generation process whereas the same ageing process results in reduced leakage current measured in the aged ester liquid, which agrees with our previous findings using the rotating disc method [9].…”

Section: Discussionsupporting

confidence: 82%

“…It is evident that the ester liquid has a higher leakage current than the mineral oil. Similar findings have also been identified in previous studies [9][10][11]. The different streaming electrification characteristics of the two liquids have been linked to the differences in the liquids' chemistry [13].…”

Section: Influence Of Agingsupporting

confidence: 76%

“…In our previous study [9], a rotating disc method was employed to compare the streaming electrification characteristics between the same mineral oil and ester liquid. In the case of the mineral oil, the aging process increased the streaming current.…”

Section: Comparisons Between the Mineral Oil And The Ester Liquidmentioning

confidence: 99%

“…Thus it is significant to study the streaming electrification behaviors of the ester liquids. Up to now, a few publications have revealed that the ester liquids generally have a higher electrostatic charging tendency than the mineral oil [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…So far, the phenomenon has been extensively studied [5][6][7][8]. Results revealed that the streaming electrification phenomenon can be affected by many factors such as flow velocity, temperature, moisture and aging [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Comparisons of streaming electrification characteristics between an ester liquid and a mineral oil using pipe flow method

Huang

Liu

2016

2016 IEEE International Conference on Dielectrics (ICD)

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Abstract-Streaming electrification has been identified as one of the main failure reasons for large power transformers. Different measurement methods including pipe flow method, rotating disk method and mini-static tester have been proposed to investigate this phenomenon. In this paper, a small scale laboratory based pipe flow model is established. The streaming electrification characteristics of a conventional mineral oil and a synthetic ester liquid were compared. Parameters including flow velocity, pressboard condition and oil aging were studied. The results indicate that the ester liquid exhibits a much higher streaming current than the mineral oil at the investigated flow velocities. Aging of the oil facilitates the charging process in the mineral oil but decreases the streaming current in the ester liquid.

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Section: Discussionsupporting

confidence: 82%

Section: Influence Of Agingsupporting

confidence: 76%

Section: Comparisons Between the Mineral Oil And The Ester Liquidmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparisons of streaming electrification characteristics between an ester liquid and a mineral oil using pipe flow method

Huang

Liu

2016

2016 IEEE International Conference on Dielectrics (ICD)

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Understanding the Flow Electrification of Synthetic Ester fluid Adopting Spinning Disc Method

Amizhtan

Thangabalan

Sarathi

2021

2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)

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Streaming Electrification of Different Insulating Fluids in Power Transformers

2022

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This paper presents a detailed review of the streaming electrification phenomena of different insulating fluids for power transformers. The comparison of different techniques used to assess the charging tendency of fluids is discussed depending on the flow type (planar or centrifugal), volume of oil, and interface material. The charge separation between the insulating fluid and metallic/pressboard interfaces is explained in terms of the electrical double layer formation involving a fixed layer and diffuse layer. Based on the experimental results, the streaming electrification is observed to be a function of various factors such as speed, temperature, electric field, and surface roughness. Depending on the molecular structure of insulating liquids that come into contact with solid insulation at the interface, the streaming current can increase; hence, a suitable additive (benzotriazole, fullerene, Irgamet 39) is selected based on the type of fluid and charge polarity. The degradation of the insulating liquid upon ageing, which increases the streaming current and reclamation of such aged fluids using adsorbents (Fuller’s earth, activated carbon, bentonite, and alumina), is a possible method to suppress the static current through improving its dielectric properties. The nanofluids show a higher streaming current compared to base fluid with no change observed even after the reclamation process. The energization process using alternating current (AC) and direct current (DC) impacts the streaming phenomenon depending on its magnitude and polarity. The diffusion of sulfur compounds in the insulating liquid is another major hazard to transformers because the sulfide ions affect the physio-chemical reaction at the interface material, which is responsible for the formation of streaming current.

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Comparison of streaming electrification characteristics between an ester liquid and a mineral oil using rotating disc method

Cited by 3 publications

References 10 publications

Comparisons of streaming electrification characteristics between an ester liquid and a mineral oil using pipe flow method

Comparisons of streaming electrification characteristics between an ester liquid and a mineral oil using pipe flow method

Understanding the Flow Electrification of Synthetic Ester fluid Adopting Spinning Disc Method

Streaming Electrification of Different Insulating Fluids in Power Transformers

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