Fourier Transform Infrared (FTIR) Spectroscopy Analysis of Transformer Paper in Mineral Oil-Paper Composite Insulation under Accelerated Thermal Aging

Munajad, Abi; Subroto, Cahyo; Suwarno, &

doi:10.3390/en11020364

Cited by 166 publications

(56 citation statements)

References 32 publications

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“…On the other hand, the molecular interactions between the acidic oil and the cellulosic polymers are evident by an absorption band at 1729.55 cm −1 (C=O stretching of the vibrations of a group ester) and 1207.95 cm −1 (stretching of the vibrations of the bridge C-O-C) [20]. Generally, all the acidic oils represent characteristics bands situated in the spectral region between 1700 cm −1 and 1730 cm −1 [25]. This is due to the vibrations that are attributable to the functional group C=O which confirms the presence of carboxylic acids.…”

Section: Fourier Transform Infrared Spectrometrymentioning

confidence: 99%

Regeneration of Transformer Insulating Fluids Using Membrane Separation Technology

et al. 2019

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Oxidation of oil/paper insulation initiates premature aging and introduces carboxylic acids with eventual increase in oil acidity, which hampers the properties of the oil. In this paper, a membrane separation technology-based purification process for aged insulation oil has been evaluated and reported. The intent of the present study is to eliminate carboxylic acids, dissolved decay contents and other colloidal contamination present in aged oil and enhance the useful life of oil. The potential of the membrane treatment process has been demonstrated using Ultraviolet Visible Infrared Spectroscopy and Fourier Transform Infrared Spectroscopy diagnostic measurements for oil and membrane. Additionally, membrane retention properties like membrane flux, retention coefficient, sorption time and membrane mass have been analyzed to understand the treatment process. To further evaluate the performance of the membrane and effectiveness of the treatment process, acidity, dielectric dissipation factor, relative permittivity, and resistivity measurements of the oil before and after filtration have been also reported. The proposed membrane purification method has been tested for Algerian utility in-service oil samples. It is inferred that, membrane filtration method is a simple and effective method for treatment of aged oils and aids in extending the remnant life of the oil. The procedure is economically attractive because of increasing prices for transformer liquids, cost effective and environmentally sounds.

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Section: Fourier Transform Infrared Spectrometrymentioning

confidence: 99%

Regeneration of Transformer Insulating Fluids Using Membrane Separation Technology

et al. 2019

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“…4 ( Figure 2). According to Munajad et al (2018), the intensities for peak absorbance was correlated with the temperature. The intensities for peak No.…”

Section: Functional Groupsmentioning

confidence: 99%

Effect of the different encapsulation methods on the physicochemical and biological properties of Clitoria ternatea flowers microencapsulated in gelatine

Liew¹,

Zin²,

Maidin³

et al. 2020

Food Res.

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Clitoria ternatea flowers are known as butterfly pea flowers which contain many bioactive compounds and can be found in tropical countries. However, the bioactive compounds are easily lost when exposed to various environmental conditions. Encapsulation technologies are introduced to provide maximum protection to the encapsulated bioactive compounds. The main objectives of this study were to determine the physicochemical properties of C. ternatea flowers encapsulated in gelatine prepared using different encapsulating methods and the microbiological properties of the best encapsulating methods for C. ternatea flowers with gelatine. In this study, the moisture contents for ultrasonic spray dried powders recorded the lowest (5.94±0.44%) while samples of convection oven recorded the highest (14.33±1.30%). However, the ultrasonic spray dried powders demonstrated the highest total flavonoid contents, but convection oven dried powders showed the lowest. The results for total anthocyanin contents were similar to total flavonoid contents. The highest encapsulation efficiency based on anthocyanin contents was found in freeze dried powders (95.75±0.24%). These results showed the same antioxidant activity (DPPH assay) with the highest percentage inhibition of freeze dried powders and the lowest percentage inhibition of ultrasonic spray dried powders. The phytochemical functional group that revealed from Fourier Transform Infrared spectroscopic (FTIR) analysis also indicate the presence of high amount of phenolic compounds in freeze dried powders although with ‘collapse building’ shape with fibrillary structure. The freeze dried powder showed the highest L* value (45.62±0.54), yet ultrasonic spray dried powders highest a*, b* and C* value. Thus, the analysis for microbial properties was carried out on freeze dried powders as freeze dryer was chosen as the best encapsulating methods. The freeze dried powders showed inhibition against gram positive and gram negative bacteria such as Bacillus cereus, Staphylococcus aureus, Escherichia coli and Salmonella enterica and fungi such as Aspergillus niger and Candida albicans. The current study demonstrated the potential of using gelatine to encapsulate technique to retain antioxidant compounds in gelatine encapsulated C. ternatea flowers. This finding provides useful information on the use of different encapsulated methods for the development of functional food products for gelatine encapsulated flowers of C. ternatea.

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“…In short, it is worth emphasizing that the present analysis finds its application in various recent developments concerning the thermal images and IR technology such as the thermal imaging and three-phase induction motor [28], infrared analysis based fault detection [29], single-phase induction motor [30], and infrared thermography and CFD modelling [31]. In the light of Fourier transforms, artificial neural networks, and real-time analysis, the scope of this research continues towards the infrared spectroscopy and accelerated thermal aging [32], aerial infrared imagery, and convolutional neural network [33], 3D printing thermoplastics [34] and their nonuniformity corrections, see [35] towards the neural network regression.…”

Section: Introductionmentioning

confidence: 95%

Optimized Passive Defense Measures via IR Imaging

Tiwari

Hadzieva

Pogarčić

2018

ASI

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In this paper, we study IR spectroscopy system design by optimizing the radiation energy in the plane of the surface temperature and wavelength. We provide infrared system designing criteria towards the formation of the optimized image of an arbitrary radiating body. As per this formulation, we find that an optimal image arises via an intrinsic statistical measure as late time thermal effects. We also outline the qualitative characteristics of the thermal radiation energy and associated quantities undermining its stability. This classifies (un)stable radiation zone detection towards cutting edge IR based information theory research & development in designing of thermal detectors. Finally, we discuss perspective applications of the IR technology, ensemble averaging, digital coding, and formation of an optimal thermal image.

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Fourier Transform Infrared (FTIR) Spectroscopy Analysis of Transformer Paper in Mineral Oil-Paper Composite Insulation under Accelerated Thermal Aging

Cited by 166 publications

References 32 publications

Regeneration of Transformer Insulating Fluids Using Membrane Separation Technology

Regeneration of Transformer Insulating Fluids Using Membrane Separation Technology

Effect of the different encapsulation methods on the physicochemical and biological properties of Clitoria ternatea flowers microencapsulated in gelatine

Optimized Passive Defense Measures via IR Imaging

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