Understanding the physico-chemical properties of thermally aged natural ester oil adopting fluorescent technique

Panigrahi, Suraj Kumar; Thakur, Shweta; Sarathi, R.; Mishra, Ashok Kumar

doi:10.1109/tdei.2017.006592

Cited by 14 publications

(13 citation statements)

References 31 publications

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“…This may be related to the decreased intensity of fluorescence with ageing. Further new decay products may form new chromophoric components due to which progressive redshift is being observed [31]. Fig.…”

Section: B Fluorescent Spectroscopic Study Of Thermally Aged Syntheti...mentioning

confidence: 98%

Fuzzy Based Condition Monitoring Tool for Real-Time Analysis of Synthetic Ester Fluid as Transformer Insulant

et al. 2022

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The present study deals with understanding insulation performance of thermally aged synthetic ester fluid through the measurements of corona inception voltage (CIV), fluorescent characteristics and dielectric loss. CIV tests were performed on thermally aged ester fluid, under AC voltage. The reduction in CIV was observed to be 54.3 % with the thermally aged ester fluid in presence of the magnetic field. Ageing temperature and time have exerted high influence on reduction in CIV. Statistical studies have shown high scatter in CIV data due to the combined effect of thermal ageing and magnetic field. Fluorescent spectroscopy studies have revealed a progressive shift in fluorescence maxima and a decrease in emission intensity with ageing time. Dielectric spectroscopy results have confirmed a reduction in dissipation factor due to thermal ageing. The drastic reduction in CIV values, shift in spectral data and increased dissipation factor after a certain duration of time and ageing temperature evidently indicate the degradation characteristics of insulation structures. A Fuzzy model is constructed to correlate the performance analysis of thermally aged synthetic ester using the results of above mentioned characterizations techniques in order to predict the key performance index and life time estimation of insulation structures.

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Section: B Fluorescent Spectroscopic Study Of Thermally Aged Syntheti...mentioning

confidence: 98%

Fuzzy Based Condition Monitoring Tool for Real-Time Analysis of Synthetic Ester Fluid as Transformer Insulant

et al. 2022

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“…As per the CIGRE references [19], the electrode size or the needle tip radius for liquid insulation studies can range from 3 to 100 µm with the ground electrode diameter is 50 mm. The gap distance between the needle and ground was maintained as 5 mm to investigate the performance of corona discharges for lower gap spacings and further it can also be compared with the previous research by the authors [16,20] where similar configuration was used for experiments.…”

Section: A High Voltage Source and Sensormentioning

confidence: 99%

“…Along with the above studies on PD detection, it is also essential to investigate the phase resolved partial discharge (PRPD) pattern under the effect of both electric and magnetic field with a statistical distribution on the breakdown voltage exhibited by the punga oil. An interesting aspect of fluorescent fiber-based sensing is that the vegetable oils are rich in vitamin E and unsaturated fatty acids that are fluorescent in nature, and its characteristics gets altered depending on the chemical structure of ester fluids [16]. The fluorescence spectroscopic measurements of insulating fluids should be performed pre-requisite to its installation inside the transformers, which enables proper selection of fluorescent fiber, for identification of incipient discharges in transformer insulation.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Impact of Magnetic Field on the Corona Discharge Activity in Punga Oil Using Fluorescent Fiber and UHF Sensor Techniques

Murugesan¹,

Amalanathan

Sarathi

et al. 2021

IEEE Access

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This paper reports the experimental investigation of the corona discharge activity of punga oil under the influence of a local magnetic field and different voltage profiles (AC and DC voltages) using fluorescent fiber sensor as well as UHF sensor technique. The corona inception voltage (CIV) of punga oil is higher under negative DC voltage followed by positive DC and AC voltage, with a marginal reduction in its CIV magnitude observed on the impact of external magnetic field. The dominant frequency of the UHF signal obtained under AC voltage shifted towards lower frequency (0.6 GHz) with the influence of magnetic flux density to about 85 mT. The rise time, pulse width and energy content of the fluorescent signal formed due to corona activity under AC voltage is found to vary under high magnetic fields confirming the inception results. The fluorescent signals formed due to corona discharge under both AC and DC voltages has its dominant frequency at 1 MHz with no shift observed in the presence of magnetic field. Also, there is no variation in the phase resolved partial discharge (PRPD) pattern observed due to corona discharge (with and without magnetic field) signal using both UHF sensor and the fluorescent sensor. The fluorescent fiber-based technique provides a better accuracy on detecting the corona discharges in punga oil at an early stage compared to conventional UHF sensor. The breakdown voltage of punga oil under different voltage profiles with and without the effect of magnetic field follows normal distribution. The dielectric dissipation factor and electrostatic charging tendency (ECT) of punga oil is observed to be higher than the limit set for insulating fluids towards power transformer operation.INDEX TERMS corona discharge, magnetic field, fluorescent fiber, UHF sensor, rise time, streaming current.

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“…With ageing, the concentration of chromophoric moieties in liquid matrix increases and they accumulate gradually to form larger carbonaceous particles. Hence the loss of fluorescence intensity is due to concentration-dependent quenching [36].…”

Section: Fluorescence Spectrummentioning

confidence: 99%

Understanding the influence of ambience on thermal ageing of natural ester liquid

Thakur¹,

Panigrahi²,

Mishra³

et al. 2019

IET Science, Measurement & Technology

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Understanding the physico-chemical properties of thermally aged natural ester oil adopting fluorescent technique

Cited by 14 publications

References 31 publications

Fuzzy Based Condition Monitoring Tool for Real-Time Analysis of Synthetic Ester Fluid as Transformer Insulant

Fuzzy Based Condition Monitoring Tool for Real-Time Analysis of Synthetic Ester Fluid as Transformer Insulant

Investigation on Impact of Magnetic Field on the Corona Discharge Activity in Punga Oil Using Fluorescent Fiber and UHF Sensor Techniques

Understanding the influence of ambience on thermal ageing of natural ester liquid

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