Comparative studies of the stability of various fluids under electrical discharge and thermal stresses

Loiselle, L.; Fofana, I.; Sabau, J.; Magdaleno-Adame, Salvador; Olivares-Galván, J. C.

doi:10.1109/tdei.2015.7311022

Cited by 34 publications

(26 citation statements)

References 13 publications

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“…Nevertheless, when sampling temperature rises, it increases the aging by-products on oil samples that pointedly increase the dielectric dissipation factor of oil samples, resulting in higher conductivity, because the conductivity of oil is directly proportional to its dissipation factor. [32][33][34] For all sampling temperatures, the specific resistivity of KOWC is much higher than MOWC as shown in Figure 4. The resistivity of oil samples are gradually decreased with the increase in operating temperature, because it causes degradation of insulating materials.…”

Section: Resultsmentioning

confidence: 86%

“…For all sampling intervals, the dielectric dissipation factor of MOWC is much higher than KOWC as shown in Figure , since the bond between carbon and hydrogen is easily broken under thermal stress, whereas Karanja oil has higher viscosity and density, which limit the dissociation rate of oil molecules. Nevertheless, when sampling temperature rises, it increases the aging by‐products on oil samples that pointedly increase the dielectric dissipation factor of oil samples, resulting in higher conductivity, because the conductivity of oil is directly proportional to its dissipation factor …”

Section: Resultsmentioning

confidence: 99%

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Feasibility analysis of Karanja oil as alternate liquid dielectrics for distribution transformers

Mariprasath

Kirubakaran

Kumar³

2017

Int. Trans. Electr. Energ. Syst.

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Summary Traditional mineral oil is used as a liquid dielectric in distribution transformers. Because of its limited fire‐resistant characteristics and biodegradability and also because of the lack of fossil fuels, the search for alternate liquid dielectrics for distribution transformer is essential. This research work has been proposed on nonedible Karanja oil as a liquid dielectric for distribution transformers. Hence, the electrical properties, physical properties, and chemical properties of Karanja oil with catalyst are measured at the temperatures of 40°C, 60°C, 80°C, 100°C, and 120°C as per the international standards; results are compared with mineral oil. From the experimental analysis, it is found that an electrical characteristic of Karanja oil with catalyst is better than mineral oil with catalyst. Furthermore, Karanja oil with catalyst has much higher acidity than others, but it is beneficial. Also, Karanja oil with catalyst has low‐relative water content than mineral oil with catalyst. However, the viscosity of the oil with catalyst is much higher than mineral oil; so care must be taken for designing the cooling tubes of a transformer.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Feasibility analysis of Karanja oil as alternate liquid dielectrics for distribution transformers

Mariprasath

Kirubakaran

Kumar³

2017

Int. Trans. Electr. Energ. Syst.

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“…Viscosity is another important thermodynamic parameter in design calculations for heat transfer by either natural convection in smaller self-cooled transformers or forced convection in larger units with pumps and the impregnation process [96]. It is the resistance of oil to flow under the force of gravity.…”

Section: Heat Transfer Propertiesmentioning

confidence: 99%

Review of Physicochemical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

et al. 2016

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Abstract:A power transformer outage has a dramatic financial consequence not only for electric power systems utilities but also for interconnected customers. The service reliability of this important asset largely depends upon the condition of the oil-paper insulation. Therefore, by keeping the qualities of oil-paper insulation system in pristine condition, the maintenance planners can reduce the decline rate of internal faults. Accurate diagnostic methods for analyzing the condition of transformers are therefore essential. Currently, there are various electrical and physicochemical diagnostic techniques available for insulation condition monitoring of power transformers. This paper is aimed at the description, analysis and interpretation of modern physicochemical diagnostics techniques for assessing insulation condition in aged transformers. Since fields and laboratory experiences have shown that transformer oil contains about 70% of diagnostic information, the physicochemical analyses of oil samples can therefore be extremely useful in monitoring the condition of power transformers.

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“…Besides, both esters are characterized by the ability to absorb water from the insulating paper, which is desirable from the point of view of paper aging. Additionally, higher electrical permittivity of esters (3.2-3.3) compared with that of mineral oils (2.2-2.4) results in a more uniform electrical field distribution in a paper-dielectric liquid insulating system [4,5,[8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The commonly adopted approach in the assessment of esters is based on the comparison of ester features with features of mineral oil registered in the same testing conditions [2][3][4][8][9][10][11][13][14][15][16][17]. Among the features of the streamers developing in dielectric liquids, the most important are the streamer shapes, currents, and light waveforms, as well as propagation velocity.…”

Section: Introductionmentioning

confidence: 99%

Streamer Propagation and Breakdown in a Very Small Point-Insulating Plate Gap in Mineral Oil and Ester Liquids at Positive Lightning Impulse Voltage

Rózga

2016

Energies

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This article presents the results of comparative studies on streamer propagation and breakdown in a point-insulating plate electrode system in mineral oil and two ester liquids. The studies were performed for a 10-mm gap and a positive standard lightning impulse. The work was focused on the comparison of light waveforms registered using the photomultiplier technique. The results indicated that both esters demonstrate a lower resistance against the appearance of fast energetic streamers than mineral oil. The reason for such a conclusion is that the number of lightning impulses supplied to the electrode system for which the above-mentioned fast streamers appeared at a given voltage level was always higher in the case of ester liquids than mineral oil. In terms of breakdown, the esters tested were assessed as more susceptible to the appearance of breakdown in the investigated electrode system. The number of breakdowns recorded in the case of esters was always greater than the corresponding number of breakdowns in mineral oil. This may be supposed on the basis of the obtained results that imply that, in both synthetic and natural ester, the formed breakdown channel, which bridged the gap through the surface of pressboard plate, is characterized by higher energy than in the case of mineral oil.

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Comparative studies of the stability of various fluids under electrical discharge and thermal stresses

Cited by 34 publications

References 13 publications

Feasibility analysis of Karanja oil as alternate liquid dielectrics for distribution transformers

Feasibility analysis of Karanja oil as alternate liquid dielectrics for distribution transformers

Review of Physicochemical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Streamer Propagation and Breakdown in a Very Small Point-Insulating Plate Gap in Mineral Oil and Ester Liquids at Positive Lightning Impulse Voltage

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