Practical Aspects of Recognition of Electric Type Defects on the Analysis Results of Gases Dissolved in Oil
Keywords:Analysis of gases dissolved in oil, Gas ratio, Graphic images, Defect type, Partial discharges, Spark discharges, Creeping discharges, Arc, X-wax, Authenticity of recognition
Background. Recognition of the type of defects in high-voltage oil-filled equipment, based on the analysis of gases dissolved in oil, using the values of the criteria that are regulated by the normative document in force in Ukraine, doesn’t always allow us to establish the correct diagnosis. Given that misdiagnosis can lead to accidental damage, ways to improve the reliability of defect type recognition are considered.
Objective. The aim of the paper is to increase the reliability of recognition of the type of defects in high-voltage oil-filled equipment, based on the analysis of gases dissolved in oil using the normative document in force in Ukraine.
Methods. A comparative analysis of the values of the ratios of gases and graphical images, for 31 types of electrical defects, for 808 units of oil-filled equipment was performed. A brief description and values of the ratios of gases and graphic images for defects, the recognition of which causes difficulties with the use of the normative document in force in Ukraine, is given.
Results. It is established that in real operation conditions the values of the diagnostic criteria used to recognize the type of defects can significantly differ from the values regulated by the normative documents in force both in Ukraine and abroad. Moreover, for some defects, the values of the gas ratios simultaneously correspond to different defects, and the reference graphic images are absent, which considerably complicates the procedure for their recognition. To eliminate these drawbacks, graphical images and ranges of values of gas ratios are offered, which allow us to recognize a greater number of varieties of defects, compared to the normative document in force in Ukraine, 31 instead of 6.Conclusions. The ranges of values of gas ratios obtained and given in the work and the graphic images of defects are a diagnostic scheme, the practical use of which makes it possible to significantly expand the range of defects recognized by the analysis of gases dissolved in oil and thereby improve the operational reliability of high-voltage oil-filled equipment.
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