A review of the fundamental dielectric characteristics of ester-based dielectric liquids

Lashbrook, Mark; Györe, Attila; Martin, Ruth A.

doi:10.1016/j.proeng.2017.09.699

Cited by 18 publications

(9 citation statements)

References 3 publications

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“…This measurement geometry is not representative of CSE conditions. When comparing different insulating liquids, they give very similar results for a given electrode arrangement in this type of testing [2]. The aged silicone oil is reported to be more prone to partial discharges, which leads to decreased resistivity [3].…”

Section: Introductionmentioning

confidence: 60%

Characterization of Silicone Oil used in HV Cable Sealing Ends

Virtanen

George

Andritsch

et al. 2019

NORD-IS

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Existing polymeric cable sealing end (CSE) typically contain silicone oil as an insulating liquid between the cable core and the outside of the CSE. In recent years, a number of performance issues have been identified with silicone oil filled CSEs. To understand the reasons for the observed behavior of silicone oil, a range of characterization methods are reviewed, to allow investigation of the influence of moisture, potential chemical contaminants and the compatibility with CSE materials. The water content of all the oils studied was above the limit given in IEC 60836 (2015) for new silicone oil. There is no significant difference between the moisture content, whether the oil is used in CSE or new. Neither did the Fourier infrared (FTIR) spectroscopic analysis show difference between the oils. Preliminary results from gas chromatography connected to mass spectrometer (GC/MS) clearly show structural differences between unused expired oil and new oil samples particularly that species suspected to be cyclic siloxane appear to be present in the expired sample.

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Section: Introductionmentioning

confidence: 60%

Characterization of Silicone Oil used in HV Cable Sealing Ends

Virtanen

George

Andritsch

et al. 2019

NORD-IS

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“…The process of departing from using only mineral oils in favor of more ecological synthetic and natural esters can already be observed, even in the case of classical cellulose insulation in new power transformers [13,14]. Such a situation is imposed on one hand by more and more restrictive provisions pertaining to natural environment protection and the reduction of the use of petroleum products and on the other hand better electrical and physicochemical parameters of new esters [3,4,15,16]. Unfortunately, their higher price and lack of wide expert knowledge that science has in the case of mineral oils resulting from years of being in use constitutes a barrier limiting the use of these insulating liquids.…”

Section: Introductionmentioning

confidence: 99%

Analysis of High-Frequency Dispersion Characteristics of Capacitance and Loss Factor of Aramid Paper Impregnated with Various Dielectric Liquids

Wolny

2019

Energies

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This paper presents research results of the loss factor of high voltage insulation samples made of aramid paper impregnated with various types of insulating oil. The analysis was carried out in the high frequency domain in the range of 50 Hz to 1 MHz. The experiments were carried out for three impregnation types: mineral oil, synthetic ester and natural ester. The influence of temperature in the range of 20 °C to 100 °C, which is typical when using this type of insulation in power transformers, was taken into account. In addition, the process of influence of initial aging of aramid paper was simulated by heat soaking the samples before their impregnation at a temperature of 250 °C in multiple time intervals. Based on the analyses of dispersion characteristics of insulation sample loss factors, conclusions and recommendations for further diagnostics of aramid-oil insulations using the method described were delineated.

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“…The insulating fluid widely used in oilimmersed transformers is mineral oil. However, this fluid has started to be substituted especially in distribution transformers for alternative liquids such as natural and synthetic esters [3] mainly due to their higher biodegradability and fire safety properties [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Kraft And Diamond Dotted Paper Thermally Aged In Mineral Oil And Natural Ester: Mechanical Characterisation

Fernández-Diego

Ortiz

Carrascal

et al. 2019

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)

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Oil-immersed transformers, whose lifespan is defined by cellulose insulation's lifetime, utilize frequently mineral oil. However, this insulating fluid is being replaced by alternative liquids such as natural and synthetic esters. This replacement requires to guarantee a similar behavior of solid insulating materials immersed in them. Although there are different authors who have concluded that Kraft paper reduces its deterioration rate when it is immersed in biodegradable fluids, there are few works that have analyzed the effect of insulation liquids on the mechanical properties of other cellulosic materials such as diamond dotted paper (DDP) during laboratory tests. This paper shows a comparative analysis of four paper/oil specimens (a standard Kraft paper and a diamond dotted paper aged in both mineral oil and natural ester) under controlled laboratory accelerated thermal ageing. This work focuses on changes in mechanical properties such as the energy consumed per unit volume of the failure zone (ER), rupture strength (σR) and strain under ultimate strength (εcm).

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A review of the fundamental dielectric characteristics of ester-based dielectric liquids

Cited by 18 publications

References 3 publications

Characterization of Silicone Oil used in HV Cable Sealing Ends

Characterization of Silicone Oil used in HV Cable Sealing Ends

Analysis of High-Frequency Dispersion Characteristics of Capacitance and Loss Factor of Aramid Paper Impregnated with Various Dielectric Liquids

Kraft And Diamond Dotted Paper Thermally Aged In Mineral Oil And Natural Ester: Mechanical Characterisation

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