Abstract
The intent of this work is to understand the influence of low energy discharge electric faults in mineral oil and synthetic esters on liquid degradation and gassing tendency at different aging conditions (based on acidity values). A low energy discharge electric fault has been created by continuous discharge of 9 kV for five hours on the liquid surface using a suitable laboratory setup. Liquid degradation is reported by adopting UV spectroscopy, turbidity, and particle counter measurements. The gassing tendency is understood by dissolved gas analysis using Duval’s triangle and Duval’s pentagon methods for mineral oil and non-mineral oils accordingly. It is observed that the influence of low energy discharges on liquid degradation is higher in mineral oils than synthetic esters. The fault gasses in mineral oil are involved with electrical and thermal faults accompanied by stray gassing whereas only partial discharge activity is noticed for synthetic esters. Importantly, the existence of low energy discharge faults like corona discharges will involve a generation of excess high molecular weight products as compared to low molecular weight products that are soluble in liquid volume.
Highlights
Insulation defects in power transformers are the main cause for most system failures
Absorbance, turbidity, particle counter, and dissolved gas analysis measurements are performed on mineral oil and synthetic esters before and after surface discharge to understand the influence of low energy electric faults on liquid degradation and tendency of gassing at various aging conditions
It may be understood that synthetic esters exhibit a good stability as compared to mineral oils towards the degradation that is caused by corona discharges
Summary
Insulation defects in power transformers are the main cause for most system failures. The influence of liquid degradation and gassing tendency at different aging conditions of mineral oil vis-à-vis synthetic esters under different fault conditions will be of high-engineering importance. It should be mentioned that after subjecting liquids to low energy discharge, electric fault degradation is accessed by dissolved decay contents, turbidity, and particle count measurements. The results of the study of the influence of the low energy discharge electric faults on the liquid degradation and gassing tendency of mineral oil and synthetic esters for fresh and aged liquids are presented. Absorbance, turbidity, particle counter, and dissolved gas analysis measurements are performed on mineral oil and synthetic esters before and after surface discharge to understand the influence of low energy electric faults on liquid degradation and tendency of gassing at various aging conditions. The gas tendency of the liquids is reported by measuring the change in pressure of the test cell
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