2015
DOI: 10.3390/en8087690
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Measurement of the Relative Free Radical Content of Insulating Oils of Petroleum Origin

Abstract: Oil/paper insulation degradation in transformers involves chemical and physical changes in the materials. Some of the chemical reactions involve very reactive intermediates called free radicals. Free radicals play a major role in a wide variety of ageing processes. The detection of these reactive species in oil may, in principle, provide useful information for monitoring oil degradation. This manuscript details a laboratory technique, which determines the relative content of free radicals in insulating oils of… Show more

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Cited by 10 publications
(4 citation statements)
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“…This alteration is attributed to the complex chemical processes which are accelerated mainly by temperature, catalysts, moisture, metal particles and other compounds produced by ageing insulation (mainly cellulose). This, in turn, changes the chemical and physical properties of the oil, accelerating the ageing of the oil and the cellulose paper [16,17].…”
Section: Ageing Mechanism Of Insulating Oilmentioning
confidence: 99%
“…This alteration is attributed to the complex chemical processes which are accelerated mainly by temperature, catalysts, moisture, metal particles and other compounds produced by ageing insulation (mainly cellulose). This, in turn, changes the chemical and physical properties of the oil, accelerating the ageing of the oil and the cellulose paper [16,17].…”
Section: Ageing Mechanism Of Insulating Oilmentioning
confidence: 99%
“…Free radicals are very reactive and can adversely affect the chemical, physical, and dielectric properties of the insulating liquid [122,123]. The reactive free radical reagent, 2,2-diphenyl-1-picrylhydrazyl (DPPH), is added to a solution, the free radical concentration of which is to be determined [124]. The presence of free radicals in solution will increase the rate at which DPPH disappears from the background solution; the higher the free radical concentration in the test specimen, the faster DPPH disappears.…”
Section: Oil Condition Ddp (Au)mentioning
confidence: 99%
“…The presence of free radicals in solution will increase the rate at which DPPH disappears from the background solution; the higher the free radical concentration in the test specimen, the faster DPPH disappears. The relative free radical concentration of an insulating oil test specimen is determined as follows [124]: initially, the absorbance of the background solution of known concentration is recorded. Subsequently the decreasing absorbance of the oil specimen added to the background solution is plotted.…”
Section: Oil Condition Ddp (Au)mentioning
confidence: 99%
“…The process of decomposition of insulating oils under electric stress begins with the breakdown of unstable mineral oil molecules covalent bonds. Oxygen, moisture or other chemical reactive radicals can spontaneously be generated; the process being catalysed by heat [5, 6]. Free radicals are very reactive and can adversely affect the physicochemical and dielectric properties of the insulating oil.…”
Section: Introductionmentioning
confidence: 99%