Common TOA4 Import Problems

When you are trying to import test data into your TOA4 Online account, there can be various reasons why either TOA4 refuses to accept the data file or some of the data records don’t get imported. Here are some cases that users have encountered so far: File upload fails 1. Error parsing data file. Usually,… Continue reading

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Thermodynamic Estimation of Transformer Fault Severity

Authors:  F. Jakob and J.J. Dukarm Published in Power Delivery, IEEE Transactions vol.30, no.4, pp.1941-1948, Aug. 2015 doi: 10.1109/TPWRD.2015.2415767 Conventional practice for transformer dissolved gas analysis (DGA) is to use concentrations of several fault gases, with or without total dissolved combustible gas, for evaluating apparent fault severity. We suggest a simpler approach based on the… Continue reading

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Remember in TOA4 Online to Analyze New Data

When you import new test data in TOA4, the dialog that appears just after you click “Import test data” contains a checkbox that tells TOA4 to do an analysis immediately upon completing the import. Normally, this checkbox should be left “checked” unless you are importing many thousands of samples at once. Really huge import files should be… Continue reading

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Cluster Assessment for Online DGA Monitoring

Author James J. Dukarm 2015 CIGRE Canada Conference This paper describes a cluster assessment (CA) method for automatic detection, assessment, and logging of significant fault gas production events by enalysis of multi-gas online monitor data. When large numbers of transformers are monitored, automatic screening interpretation of the data is necessary. The automated interpretation of dissolved… Continue reading

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A Thermodynamic Approach to Evaluation of the Severity of Transformer Faults

Authors: F. Jakob, P. Noble, J.J. Dukarm, J.J Published in Power Delivery, IEEE Transactions on vol.27, no.2, pp.554-559, April 2012 doi: 10.1109/TPWRD.2011.2175950 Abstract: Dissolved gas analysis (DGA) has been used to classify the type and severity of faults in transformers. The method commonly used to identify severity is to measure the total fault gas concentration… Continue reading

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