Transformer Condition and Operational Risk Evaluation
Transformer Condition and Operational Risk Evaluation
复制标题
变压器状况和操作风险评估
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Hermann Filipot
中科院分区：
文献类型：
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作者：
C. Sumereder;R. Schmid;S. Kornhuber;T. Friedrich;G. Valtin;Hermann Filipot
In this joint project between five companies and two universities an algorithm for the evaluation of the condition and operational risk of aged power transformers was developed. In the first stage the operational dates and results of oil analysis investigations as well as maintenance measures of about 70 selected transformers were collected in a standardized scheme. These data were the basis for the further analysis of the technical condition. The oil analysis results according to IEC 60422 (chemical physical parameters) as well as IEC 60599 (dissolved gas analysis) were evaluated and interpreted automatically. In a second stage a diagnosis program for onsite measurements at most of the selected transformers was developed. For the diagnosis of the solid insulation system the winding resistance and winding insulation was measured and the polarization and depolarization current (PDC), frequency domain spectroscopy (FDS) and frequency response analysis (FRA) was applied. The tap changer and the bushings were tested with a resonance system. At the tank a visual inspection was done. At some transformers actual oil samples were taken and analysed by chemical parameters, DGA and furan analysis. All diagnosis and test results were evaluated and collected in the evaluation algorithm. At one transformer an end of life inspection was done in the site of a transformer manufacturer after a full diagnostic program onsite. The results of the diagnostic measurement onsite and the results of the inspection after opening the transformer corresponded excellent. The developed algorithm enables a view to the condition of each transformer and a comparison of the whole fleet. The operational risk of each transformer component is evaluated by bar graphs. If there were any critical components found recommendations for maintenance measures were worked out. The aim of this algorithm was to collect the operational history with the focus to find the actual condition and the operational risk of each transformer.
