Evaluation of dissolved gas analysis and long-term performance of non-edible natural ester

Baruah, Niharika; Dey, Sujita Srichandana; Nayak, Sisir Kumar

doi:10.1109/tdei.2020.008768

Cited by 16 publications

(5 citation statements)

References 22 publications

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“…The absorption peaks at 2922.16 cm -1 and 2852.72 cm -1 represent the asymmetric stretching vibration of C-H of -CH 2 groups and the symmetric stretching vibration of CH 2 groups (Jacob et al, 2020;Jamo et al, 2019;Ramli et al, 2021), respectively. At the absorbance wave number 1741.72 cm -1 , a long and narrow, strong peak can be seen for all samples; it represents C=O stretching indicating the formation of ester (Baruah et al, 2020;Jacob et al, 2020;Maharana et al, 2019). The absorbance peaks at a wavenumber of 1168 cm -1 and 721.36 cm -1 indicated the presence of the C-O band stretching, establishing the existence of an ester (Ravulapalli et al, 2019).…”

Section: Characterisation Of Pure Pome Pome-based Sio 2 Nfs and Pome-...mentioning

confidence: 85%

Assessing Electrical and Physicochemical Performance of Chemically Modified Palm Oil as an Alternative Transformer Liquid

MASRA¹

2022

JOPR

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Numerous studies have been conducted on enhancing the dielectric properties of palm oil (PO) with the addition of nanoparticles (NPs). However, insufficient emphasis was given to its physicochemical properties, which are also critical for the function of an insulating liquid. The high viscosity of PO is one of the key factors which deteriorates the usage of natural ester in general, and PO in our case. This study was intended to investigate the performance of chemically modified PO by adopting a sequential transesterification process -NPs addition. The present work explored the transesterified PO blended with insulative (SiO 2 ) and semiconductive (ZnO) NPs at various concentrations (0.1-0.6 g L -1 ). The modified oils' dielectric strength and physicochemical properties (density, kinematic viscosity, and water content) were measured using standard testing methods. The results showed that the transesterification process effectively reduced the viscosity of PO, and adding ZnO NPs substantially impacted the PO in terms of AC breakdown voltage, with an optimum performance at 0.2 g L -1 concentration of 85% improvement. In contrast, while using SiO 2 , its breakdown voltage decreased irrespective of the concentration.

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Section: Characterisation Of Pure Pome Pome-based Sio 2 Nfs and Pome-...mentioning

confidence: 85%

Assessing Electrical and Physicochemical Performance of Chemically Modified Palm Oil as an Alternative Transformer Liquid

MASRA¹

2022

JOPR

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“…Researchers have demonstrated that the degradation suffered by the cellulosic materials is lower when the cooling fluid is a natural ester, derived from sunflower, rapeseed, soy or palm, instead of a mineral oil at similar conditions [16], [17], [19], [21], [22], [23]. The levels of degradation depended on the specific oil and the conditions of the study, not all the natural esters protected the insulation from degradation in the same degree [19], [24], and other natural esters of different origin (corn, peanut, coconut or mustard) showed worst performance [25], [26], [27], [28] The results with synthetic esters reflects slightly lower degradation than with the mineral oils [19], [29].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the conditions of the ageing usually vary. Only respecting the researches here cited, there are examples of thermal ageing carried out at 80 [29], 100 [29], 110 [16], 120 [16], [21], [24], [29], [32], [35], 130 [16], [19], 140 [32], [35], 150 [17], [22], [25], [33], 151 [23], 160 [23], [32], [33], 165 [22], 168,5 [23], 170 [33], [36], 180 [22], 200, 400 and 800 • C [37]. This dispersion is worsened if the moisture initial content is considered.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the Ageing Performance of Alternative Dielectric Fluids

et al. 2023

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Mineral oil has traditionally been used as a cooling fluid in power transformers, but its low biodegradability and low fire point have motivated the search of alternatives. In this work, six different dielectric fluids have been studied, including four vegetable liquids, from sunflower, rapeseed, soybean, and palm, one synthetic ester and a mineral oil used for comparison. These oils were subjected to an accelerated thermal ageing in glass vessels at 150 • C for four weeks (672 hours) in presence of Kraft insulating paper. Different oils parameters were measured during the ageing, i.e. breakdown voltage, dielectric dissipation factor, permittivity, DC resistivity, density, kinematic viscosity, flash and fire points, interfacial tension, acidity, and dissolved gases; additionally, the degree of polymerisation (DP) of the paper was measured. Results showed that the changes of the natural esters properties, except for the palm oil, were similar along the ageing time. Palm oil results were similar to those of the mineral oil, whereas synthetic ester showed a behaviour similar to natural esters. The kraft paper degradation was higher in the mineral oil, followed by the synthetic ester and the palm oil. No significant differences were found in the ageing with the natural esters.INDEX TERMS Insulating paper, natural esters, thermal ageing, transformers.

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“…Dissolved gases in transformer oil are related closely to the type of incipient insulation failure in oil-immersible power equipment [1,2]. Dissolved Gases Analysis (DGA) is one of the most effective techniques which can assess the state of oil-paper insulation [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Investigation on gas generation characteristics in transformer oil under vibration

Guo

Zhang

et al. 2022

IET Generation Trans & Dist

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Operating experience has shown that characteristic gases can be found in oil-immersed power transformers and high-voltage reactors under strong vibration without discharge or thermal faults occurring. This will cause misdiagnosis of Dissolved Gases Analysis (DGA). In this study, generation characteristics and mechanism of characteristic gases in transformer oil dependent on vibration are investigated. The results show that there is a vibration pressure threshold that makes characteristic gases such as hydrogen (H 2 ), methane (CH 4 ), ethylene (C 2 H 4 ), ethane (C 2 H 6 ), and acetylene (C 2 H 2 ) appear in transformer oil. The concentration of each characteristic gas increases with the increase of vibration pressure. Furthermore, misdiagnosis of insulation status which may be caused by vibration is illustrated based on Duval triangles method. Besides, vibration bubbling phenomenon in the experiment is observed. The generation mechanism of characteristic gases is analyzed with bubble dynamics under vibration. Higher vibration pressure induces cavitation processes and creates local thermal effects, which is the main reason for the generation of characteristic gases. A method based on combination of Duval triangle 1 and assistant triangle is proposed to distinguish characteristic gases generated by vibration from those generated by discharge and thermal faults. The results may provide theoretical support for fault identification and insulation state assessment of oil-immersed power transformers and high-voltage reactors.

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Evaluation of dissolved gas analysis and long-term performance of non-edible natural ester

Cited by 16 publications

References 22 publications

Assessing Electrical and Physicochemical Performance of Chemically Modified Palm Oil as an Alternative Transformer Liquid

Assessing Electrical and Physicochemical Performance of Chemically Modified Palm Oil as an Alternative Transformer Liquid

Understanding the Ageing Performance of Alternative Dielectric Fluids

Investigation on gas generation characteristics in transformer oil under vibration

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