Electrostatic charging in transformer oils. Testing and assessment

Sierota, A.; Rungis, J.

doi:10.1109/94.326655

Cited by 45 publications

(17 citation statements)

References 46 publications

(73 reference statements)

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“…The streaming electrification mechanism of mineral oil has already been partially described [11][12][13]. The streaming electrification of oil is caused by the hydroxyl group of the insulating paper molecular structure (Cellulose).…”

Section: Conventional Streaming Electrification Mechanismmentioning

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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Section: Conventional Streaming Electrification Mechanismmentioning

confidence: 99%

Streaming Electrification Characteristics of Silicone Oil

Nakajima

Miyahara

Ishikawa

et al. 2008

IEEE Trans. Dielect. Electr. Insul.

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“…Since 1989, under CIGRE, an international research program of the Working Group 12/15-02 has been implemented [2][3][4]. In the USA, the problem of streaming electrification was dealt with by the Electric Power Research Institute (EPRI) in cooperation with the Massachusetts Institute of Technology (MIT), under the Static Electrification in Power Transformers project [5]. Originally, the ECT research was carried out on transformers subjected to acceptance tests at diagnostic stations [6].…”

Section: Introductionmentioning

confidence: 99%

Streaming electrification of mineral insulating oil and synthetic ester MIDEL 7131

Zdanowski

2014

IEEE Trans. Dielect. Electr. Insul.

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Determining the Electrostatic Charging Tendency (ECT) level of insulating liquids requires no large and therefore costly transformers or modelling systems. Small laboratory systems are characterised by simple design and methodology, low volume of liquid sample required for testing, low cost of construction and the following tests. This also applies to pipe flow systems. This paper presents comparative studies of the phenomenon of streaming electrification of mineral TRAFO EN insulating oil and MIDEL 7131 ® synthetic ester flowing through a pipe made of conventional cellulose paper and modern aramid paper. Electrification current vs. liquid flow speed was measured. The influence of pipe material was determined. Also the effect of temperature and sample aging time on the extent of the streaming electrification was studied. With the Abedian-Sonin model, volume density of the q w charge, which is a parameter describing ECT of insulating liquids, was determined.

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“…If the relaxation does not eliminate charge quickly enough, a static electrical field can be established, which may end in a static electrical discharge [19], [20]. This phenomenon has been reported as a significant factor in some transformer failures [3], [16], [21]. Static electrification is a function of many parameters including temperature and moisture but primarily the pressboard surface structure and oil condition, specifically the oil electrical charging tendency [22].…”

Section: Static Electrificationmentioning

confidence: 99%