IDD®

IDD® IntellIgent DIagnostIc DevIces

IntroductionA family of continuous online diagnostic devices for power system apparatus intended to detect incipient problems with bushings/CTs, transformers, and circuit breakers. Now, progressive problems can be managed safely, and replacement can be deferred until corrective action can be scheduled efficiently.

• Rugged and Reliable – Designed to operate reliably in electrically noisy substa-tions and in extreme weather conditions.

• Self-Diagnostics – The firmware will monitor critical signals continuously for proper operation of the IDD. Indication of the malfunction is given locally as well as remotely.

• Web Browser PC interface – The IDD can be accessed via a standard web browser available on all PCs. No special software installation is required on the PC.

DescriptionThe IDD, Intelligent Diagnostic Device, is a cost-effective online diagnostic system used to monitor electrical apparatus in the field. Each IDD is intended to be apparatus spe-cific and can be mounted in existing enclo-sures or in optional enclosures available from Doble. The IDD is easy to install and, once configured, operates continuously. The IDD contains a state-of-the-art microprocessor-based signal processing module, a control panel for user interface, alert indications, an RS-232 serial port for local PC access, as well as options for remote communication.

The IDD software system acquires data through the data acquisition board and ana-lyzes this information using the field-proven expert diagnostic system. The software provides an assessment of the apparatus on a continuous basis. This eliminates the need for an external server or database. An IDD can be configured for analysis of various subsystems by simply installing the appropri-ate data acquisition board.

Features• Continuous Condition Assessment – The

status of the apparatus is constantly being evaluated by the field-proven diagnostic expert system, minimizing the need to per-

form routine testing.

• Early Identification of Problems – Refined signal processing and field-proven analysis will identify abnor-malities, anticipate failures, and eliminate false alerts.

• Prioritized Alerts – Based on the significance of the incipient problem, the analysis will issue an alert indicating the criticality of the problem, providing a tool to manage risk.

• Specifies Corrective Action – An alert identifies the problem and prompts corrective action required to resolve the problem.

• Simple and Easy Installation – A self-con-tained device which simply requires con-necting sensors, input power, and optional remote communication to complete instal-lation. Minimum outage time and resources are needed for installation.

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The firmware automatically detects the installed hardware and activates the appro-priate expert system analysis. IDD’s versatile design allows easy hardware and software upgrades in the field.

The alphanumeric display shows the highest level alert issued by the expert system. For detailed measurement, the IDD can be accessed via a local PC via an RS-232 port. A standard web browser is the only application required for viewing alerts and data, as well as configuring the IDD. The same functionality is also offered with the remote communication options. The IDD can be configured to display its web pages in the local language. Contact Doble for more information about which languages are currently available.

The IDD is designed to operate reliably under extreme weather conditions and electrical interference. The self-diagnostic continuously tracks the condition of the unit and issues an alert if an abnormality is detected.

The Doble DifferenceContinuous online diagnostic assessment of critical apparatus can help ensure optimal asset utilization by identifying the most appropriate and cost-effective corrective action.

With more than 80 years of high voltage apparatus expertise, Doble has designed and engineered the IDD with a built-in expert diagnostic system. The expert system, when appropriate, will issue a prioritized alert. The alert identifies any abnormalities in the apparatus and indicates the severity along with required corrective action. Alerts are classified in three categories: information, warning, and action. Action is the highest level of alert, requiring an immediate corrective response.

Built-in hardware and software diagnostics continuously monitor the IDD and the associated sensors to verify proper installation and functionality, making the IDD virtually maintenance-free. Indication of a problem is provided locally as well as remotely.

The IDD provides a Maintenance Mode feature, which allows the analysis to be placed on standby when the apparatus is out of service. This feature ensures the integrity of the analysis and prevents unnecessary alerts.

ProtocolCommunication with the IDD is viewable through any web browser and is accessible locally over the RS232 port or remotely through the Ethernet Modem, RS485, or RS232 connections. No additional software is required.

Remote Communication OptionsAn IDD can be configured with any of the fol-lowing remote communication options:

• Ethernet TCP/IP • RS485 supports DNP3 and ASCII • Modem • Supervisory I/O • RS232 supports DNP3 and ASCII

The Supervisory I/O offers a SCADA interface for the IDD. This communication option consists of four outputs and two inputs. The input serves to acknowledge and reset the alerts. The outputs are potential-free contacts that correspond to low, medium, and high alerts and the status of the IDD.

IDD ConfigurationOne IDD will support:

• 12 Bushings, 4 sets of 3

– Requires 2 Data Acquisition Boards – Each Data Acquisition Board accepts inputs from 6 Bushings – Maximum of 2 Data Acquisition Boards can be installed in an IDD

• 3 Inputs from moisture sensors

– Requires IDD Converter Module Type RS232/RS485, one for each sensor

• 3 Inputs from dissolved gas sensor

– Requires IDD Converter Module Type RS232/RS485, one for each sensor

Technical SpecificationsIDD Electrical Inputs:Input Measuring Range .............................................................................0 - 100mAAccuracy ........................................................................................ +/- 1% of readingResolution .........................................................................................................12 bitSampling rate .....................................................................................................5kHzIsolation between phases ............................................... 2500V RMS, for one minute

Power Supply: ......................................90 - 264 VAC, 47 - 63 Hz or 100 - 280 Vdc

Environment:Designed to meet:Surge withstand .................................................. ANSI/IEEE C37.90.1-1989 (R1994)ESD: EN 61000-4-2 Ambient Operating Temp ...............................................................-40° to 65° C Storage Temp ................................................................................-40° to 85° C Humidity .................................................................5% to 95% non-condensing

Physical Dimensions:17.25 in. H x 15.25 in. W x 3 in. D (438.2mm H x 387.4mm W x 76.2mm D) for controlcabinet mounting

Supervisory I/O: Four output contacts: ACTION ALERT! WARNING ALERT! INFORMATION ALERT! Self Monitoring Ratings: Switching 10A @ 240Vac resistive, 3A @ 240Vac inductive, 0.5A @ 125Vdc, 0.25A @ 250Vdc Dielectric Strength 3000Vac, coil to contacts, 1000Vac between contacts. Surge Strength .............................................................. 6000V, coil to contacts.

Two inputs: Remote ALERT! Acknowledge Remote ALERT! Reset Ratings: Input Range ...................................................... 12V to 300Vdc, 12V to 264Vac Input Current ........................................... 1mA @ 24Vdc, 2mA pk @ 264V RMS Isolation voltage .............................................................. 2500V RMS, 1 minute

Specifications are subject to change.

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Doble Engineering Company

85 Walnut Street

Watertown, MA 02472 USA

tel +1 617 926 4900

fax +1 617 926 0528For more information, email IDD@doble.com

MKT-SL-IDDB-01/10

Doble is certified ISO 9001:2000

Doble is an ESCO Technologies company