Doble TDR900 User Guide
72A-2612-01 Rev. A 09/06
19
Chapter 5
Breaker Timing Tests with T-Doble: Overview
This section gives an overview of basic connections and software to run a T-Doble test
on a breaker.
The Doble TDR900 Instrument comes complete with Windows ™ based software which
runs on a standard PC supplied by the user. As a minimum, 512 Mb of RAM are
recommended.
The software should be installed on the PC, in accordance with normal Windows™
software installation (See Section 6.2.)
TDR test preparations consist of:
• Preparing the breaker or other test object
• Preparing the Doble TDR900 Instrument
• Connecting the test leads and transducers
• Running a test
• Reviewing data
• Closing the software and powering down the TDR900
5.1 General Set Up Information
The TDR900 is ruggedly designed for field use; however, care should be taken during
transportation, use and storage of the equipment.
• Do not drop or throw the TDR900.
• Do not use the TDR900 or any transducer as a step or a platform.
• Do not expose the TDR900 to rain, snow, sand, excessive heat or dust.
• Always transport the TDR900 with protective cover in place.
• Always adhere to manufacturer’s circuit breaker specifications, industry
procedures and safety standards.
5.2 Preparing the Breaker – Off-Line Tests
Completely isolate the breaker to be tested from the power system using established rules
and safety guidelines. This requires that all bushings of all phases be disconnected from
any bus-bars and insulators.
Connections at the breaker cabinet and at the breaker terminals should only be made by
authorized and qualified personnel.
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