Regeneration of Transformer Insulating Fluids Using Membrane Separation Technology

Safiddine, Leila; Zafour, Hadj-Ziane; Rao, U. Mohan; Fofana, I.

doi:10.3390/en12030368

Cited by 25 publications

(6 citation statements)

References 24 publications

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“…This process is based on the removal of acidic elements, water and aging by-products in the oil using adsorption processes with activated bentonite as adsorbent. Figure 3 shows the adsorption processes, which include drying, filtering, sedimentation, and removing impurities [27,28]. The regeneration treatment is conducted in accordance with IEC 60422 Standard [29].…”

Section: Experiments Preparationmentioning

confidence: 99%

The Correlation of Transformer Oil Electrical Properties with Water Content Using a Regression Approach

Abdi

Harid

Safiddine³

et al. 2021

Energies

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An experimental investigation is conducted to measure and correlate the impact of the water content on the electrical characteristics of the mineral oil for transformers, particularly the breakdown voltage, the resistivity, and the dielectric dissipation factor. Regression method is carried out to compare the results obtained through laboratory experiments with those predicted using an analytical model. A treatment to reduce water content in oil involving filtration, degassing and dehydration using a SESCO mobile station was applied to the new, regenerated, and used oil samples in service. The breakdown voltage, the resistivity, and the dielectric dissipation factor of the samples were measured. Regression analysis using an exponential model was applied to examine the samples electrical properties. The results show that, after treatment, the breakdown voltage and resistivity increase as the water content decreases, unlike the dielectric dissipation factor which exhibits a decreasing trend. This trend is found to be similar for the three oil samples: new, regenerated, and used. The results of the regression analysis give close agreement with the experimental results for all the samples and all studied characteristics. The model shows strong correlation with high coefficients (>90%).

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Section: Experiments Preparationmentioning

confidence: 99%

The Correlation of Transformer Oil Electrical Properties with Water Content Using a Regression Approach

Abdi

Harid

Safiddine³

et al. 2021

Energies

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“…Abdi et al [16] have conducted experiments to measure and correlate the effect of water content on the electrical properties of mineral oil and observed that after treatment, the breakdown voltage is increased as water content decreases. Safiddin et al [17] have taken the used transformer oil and with the help of the membrane separation technology process its life is enhanced by eliminating carboxylic acids.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of moisture and sonication time on dielectric strength and heat transfer performance of transformer oil based Al2O3 nanofluid

Babu¹,

Kumar²,

Babu³

2021

IJATEE

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Power transformer's role is very much critical in transmission and distribution of electricity to the consumers from power stations. The insulating liquid is crucial to the performance of the transformer [1]. Transformers expose to various stresses like thermal, electric, and chemical during their operation. Periodical check-ups and maintenance of insulating oil in the transformer are very much required to prevent sudden failure [2]. One of the most detrimental elements to transformer paper and oil insulation is moisture. It weakens the dielectric and lowers the partial discharge (PD) inception voltage, affects the electrical characteristics [3]. Aging and external causes are the two most important variables that encourage moisture intrusion in transformers. The moisture equilibrium characteristics of oil and paper insulation are well-known and broadly applied to estimate how much moisture is involved. *Author for correspondence Oil, on the other hand, can loses its insulating properties if it is polluted by moisture, particles, or a combination of the two [4]. Moisture contamination is thought to happen when voltage load taps are changed, allowing moisture and gases to absorb. The deterioration of the paper insulation between the transformer windings causes particle pollution [5].Transformers are built to withstand large loads, such as emergency and cold load pickup circumstances. As the load on the transformer grows, the internal temperature rises which in turn reduces the transformer's typical life expectancy. This process might take anything from months to years. Characteristics of a good cooling liquid include high thermal conductivity, low viscosity, high specific heat, high dielectric strength (in case of direct liquid cooling), high surface tension, chemical inertness, chemical stability, low freezing point, and melting points, and low cost. Insulating liquids need to retain their electrical and thermo-physical properties for a long time [6]. But in practice, after using those oils for a long time they lose their properties. In order to

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“…Subsequently, these aging products will continue to accelerate the aging process. Instead of replacing insulating oil, the regeneration of insulating oil is a promising method that prolongs the transformer life and reduces carbon emissions [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

One-Step Electrical Insulating Oil Regeneration on Electret PVDF/BaTiO3 Composite Nanofibers

et al. 2022

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Insulating oil is a pivotal component of power transformers, but it suffers from aging byproducts during service operation. The aging byproducts from the degradation of oil insulation tend to induce insulation failure, which poses a significant threat to the security of the power grid. Therefore, the regeneration of insulating oil is required to prolong the useful life of insulating oil and hence be of economic and ecological interests. Typical in-use oil regeneration routes employ multi-step procedures. In this work, a one-step regeneration method using a PVDF/BaTiO3 composite membrane is proposed. BaTiO3 endows the composite membrane with improved hydrophobicity and an electret state. The regeneration performance of the PVDF/BaTiO3 nanofiber membrane was assessed by considering the acid value, moisture content, dielectric loss factor tan δ, and the AC breakdown voltage of the refreshed oil. The test results showed that the filtration efficiencies toward formic acid and moisture were up to 77.5% and 60.6%, respectively. Moreover, the dielectric loss factor tan δ of the refreshed oil decreased evidently at a power frequency, and the AC breakdown voltage rose from 23.7 kV to 38.9 kV. This suggests that the PVDF/BaTiO3 composite membrane may be employed efficiently, and it minimizes aging byproducts via the one-step filtration.

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Regeneration of Transformer Insulating Fluids Using Membrane Separation Technology

Cited by 25 publications

References 24 publications

The Correlation of Transformer Oil Electrical Properties with Water Content Using a Regression Approach

The Correlation of Transformer Oil Electrical Properties with Water Content Using a Regression Approach

Effect of moisture and sonication time on dielectric strength and heat transfer performance of transformer oil based Al2O3 nanofluid

One-Step Electrical Insulating Oil Regeneration on Electret PVDF/BaTiO3 Composite Nanofibers

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