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TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01 4-75
Monday
, November 26, 2001 1:09 pm
Running Tests
With the TDR9000 properly connected to the test environment and the
Virtual Front Panel configured with the proper channels and values, a
first test can be run.
Running a First Trip/Close Test: Special Considerations
Special considerations include:
1. Run the First Trip test.
The TDR9000 records the test results after the circuit breaker is
tripped externally.
2. Run the First Close test, after making the following changes in the
preparations described above:
• Change the Analog Channel label in the Test Plan from Trip Coil
to Close Coil.
• Move the current probe measuring the Trip relay coil current to
measure the Close relay coil current.
• Change the Auxiliary Contact label in the Test Plan from 52CS/T
to 52CS/C.
• Move the Aux Contact channel cables on the circuit breaker from
across the 52CS/T contacts to across the 52CS/C contacts.
This serves as the trigger source for the First Close operation.
3. Repeat both the Trip and Close tests, alternating the connections and
labels as described in step 2, for comparison of the First Trip/Close
tests to subsequent tests.
To reduce time re-labeling of the Analog and Auxiliary Contact
channels when alternating between First Trip and First Close, the
channels being used to measure First Trip/Close relay coil current and
Trigger source contact state can be given a more generic label, such
as T/C Coil for the Analog channel and 52CS/T-C for the Auxiliary
Contact channel.