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ETMI can install and maintain Doble's IDD, Intelligent Diagnostic Device for Bushings and CTs.

This revolutionary online diagnostic package will continually monitor bushings and CTs. The IDD with its field-proven embedded expert system will detect abnormalities in the insulation system and when appropriate, will issue alerts. The IDD will display alerts locally and remotely. These IDDs will keep asset managers informed of the status of their bushings, providing them lead-time to determine the appropriate corrective action.

*Click on each image for larger view.

ETMI provided a turn-key IDD installation for the (3) single-phase GSU's at the Rawhide Generating station.

View of 230kv bushing tap adapter installation.
View of the installed conduit and bushing tap adapter for the 25kV bushing within the ISO phase bus duct.

Top view of Domino and Hydran valves and sensors installed on the lower cooler pipe.
Front view of the Domino, Hydran, and the communication converters for communication to the IDD.

ETMI installs IDD system on 3-phase Autotransformer.
This unit is an existing 230/115kV 150MVA with a tertiary. The system is designed to monitor its (9) bushings. A Doble domino was installed for moisture and oil temperature monitoring. A GE Hydran 201Ti sensor is used for hydrogen gas detection. SCADA contact indication and dial tone was incorporated for remote access.

As found control cabinet layout.
IDD unit installed on swing door with aux power panel mounted on side wall for IDD and oil sensor power. 

View of 230kV side rigid conduit and seal tight conduit system for bushing tap connection.

View of 115kV side conduit system.
View of Tertiary side conduit system.

As found lower radiator pipe and flange assembly.

Installation of 1" valve for Domino sensor and 1.5" valve for hydran sensor.
Overall oil sensor view with Domino display mounted on side of control cabinet. 

Electro-Test and Maintenance, Inc – home Doble Equipment Sales Agent Cooper Power Systems Authorized Service Center