DTA

Doble Engineering Company 85 Walnut St. Watertown, MA USA 02472-4037 Tel +1 617.926.4900 Fax +1 617.926.0528

Doble Test Assistant

The expert system also provides a list of recom-mended investigative procedures if questionable testresults are obtained. These investigative tests canquickly confirm the existence of a problem, if thereis one, eliminating the need for a second outage toinvestigate questionable results.

The DTA database, with nameplate data and results,provides a complete inventory of all tested appara-tus, useful for analysis across apparatus types andfor finding apparatus when manufacturers issueservice advisories. DTA also stores field diagnostictest data including turns ratio test, insulation resist-ance measurements, insulating fluid tests, dew pointand moisture content of SF6 gas, etc. DTA file man-agement capabilities include: copying, moving, andarchiving test data.

DTA contains reference data on an extensive list ofapparatus as well as exstensive on-line help

(DTA), a WindowsTM program, automatically col-lects M4000 test data, calculates power factor (tandelta), analyzes test results with expert system soft-ware, and stores test results in its database. DTAcompares test data to previous data and Doblespublished test data limits, applies temperature cor-rection curves, compares tests among similar unitsand provides ratings and messages explaining theratings. On-screen test procedures provide appara-tus diagnostic guidance for users in the field.

DTA contains standardized test procedures that pro-vide consistencies so that, regardless of the tester,the same test will be performed in a similar formatthat is clear and easy to understand.

DTA provides expert system analysis of each testresult, including an insulation rating (I-investigate,D-deteriorated, G-good, etc.) with an explanation asto how the rating was aquired.

Insulation condition assesmentwith expert System analysis feature

Corrective action recommendations

Built-in apparatus Templates andTest procedures

Apparatus performance limitsCorrection factors

Data Archiving, Reports, Trendingand Historical comparisons withrelationl database

Doble Test Assistant (DTA) Software and its expert system analysis feature, together with theDoble M4000 Automated Insulation Analyzer is the most advanced automated system fortesting and analyzing the power factor (tan delta) of high-voltage apparatus in the industry.

DTA and M4000 testing can greatly increase the reliability of power systems and safely extend the usefullife of apparatus, Dobles goal since its founding in 1920

The DTA expert system validates test results for proper use of the M4000 and rates insulationas I - investigate, D - deteriorated, and G - good, as shown in the Ratings (INS RTG) columnon the right of the test screen shown above

The DTA expert systems knowledge was developedfrom a data base of over 5 million test results andover seventy years of Doble Client Service experi-ence. It contains more than 3,700 rules and incor-porates up to 30 test characteristics. It also hasembedded temperature correction parameters thatautomatically adjust test results to a 20 C base.

When the expert system finds insulation ratingsother than Good, it recommends correctiveactions as shown on the above screen.

DTA consists of Field and Office modules. Fieldsupports all field testing operations. DTA Officetakes test results from the field systems and incor-porates them into its relational database. DTAOffice has capabilities for querying the database,and generating reports for determining trends, main-tenance scheduling, and apparatus inventory. DTAOffice also provides a safe backup of data that canbe shared across a network. DTA Software alsoallows users to send and receive DTA files, andquery the DTA database remotely over telephone

For more information, contact: Doble Engineering Company85 Walnut StreetWatertown, MA 02472-9107 USAT. 617.926.4900F. 617.926.0528www.doble.com

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