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Identifying Transformer Faults with DGA
Mar 21, 2017
IMAGINE trying to explain power transformer fault detection to your child’s second grade class or to a CFO who does not have a technology background. The conversation < ...
Read MoreTransformer Reliability and Dissolved-Gas Analysis
Authors: J.J. Dukarm and M. Duval 2016 CIGRE Canada Conference October 17, 2016 Dissolved gas analysis (DGA) is widely used for transformer condition screening and assessment. Conventional DGA prac ...
Read MoreTDCG, TCG, ETCG, ESHL, etc.
TOA4’s gas analysis report contains several alphabet-soup items which are explained here along with a couple of related items. In each case we start with the text label you see on the page or report, ...
Read MoreTOA4’s DGA Summary Report
One of the download links at the bottom of the equipment list page provides a DGA Summary report in .csv format. To use the summary report, first filter and sort the equipment list to show the equipme ...
Read MoreTOA4’s Fluid Quality Index (fqindex)
The S. D. Myers Inc. laboratory reports the ratio of interfacial tension (IFT) and acid number as an indicator of the exte ...
Read MoreTOA4 Online Q&A
What is the difference between kv_ratings and ratedkv in TOA4? The ratedkv field — a “legacy” field inherited from TOA3 — is numeric and designates the rated kV of a piece of equip ...
Read MoreTOA4 In-Service Equipment Filter
Each equipment item has an “In-service” checkbox – visible when editing the item – which should be checked if the equipment is in service and unchecked if the equipment is not in service, i.e., retire ...
Read MoreTOA4 Online Mobile Access
If you are a TOA4 Online user and have a web-enabled cell phone, Blackberry, or PDA, you might like to try out TOA4’s new mobile access feature. Point your phone’s web browser to the TOA4 Online addre ...
Read MoreHoney, I deleted all my data!
Early one Monday morning a TOA4 Online user reported, not too cheerfully, having “accidentally” deleted all of the equipment (and therefore all of the test data too) from her company’s TOA4 database. ...
Read MoreCommon 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 ...
Read MoreThermodynamic 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 diss ...
Read MoreRemember 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 completin ...
Read MoreCluster Assessment for Online DGA Monitoring
Jul 21, 2015
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 event ...
Read MoreA 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: Di ...
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