Description
2.9 Self-monitoring and diagnostics
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
179
Tripping time
The time required from exceeding the limit values to actuation of the tripping solenoid is
determined, displayed and evaluated as the tripping time. If the determined tripping time
is within the specified tolerances, the test is passed.
Mechanical system
During the test, the F5 tripping solenoid, the breaker latching mechanism, and the main
contacts are also checked for proper functioning. If a BSS200 Breaker Status Sensor is
present and active, the opening of the main contacts is automatically detected and
signaled. If there is no BSS200, then the tester must confirm the opening of the main
contacts in the software. If the main contacts are open, the test is passed.
A test trip has no influence on the electrical wear of the main contacts, but is counted as
a mechanical operating cycle.
Note
Influence of the thermal memory of
the 3WA air circuit breaker on the test results
Since the protective function is not affected by the test, the thermal memory of the
circuit breaker may affect the test results if tested several times.
This can lead to the test result being outside the to
lerances and being evaluated as an
To prevent this, turn off the thermal memory before testing or compare the system
behavior during repeated testing with and without thermal memory to avoid errors.
Test report
Each software-assisted test is stored in the SENTRON powerconfig configuration
software and a test report can be generated. The test report can be printed out or saved
as a PDF.
The ability to print test reports depends on the license.
All results, protection parameters and statistics of the self-monitoring functions are
stored in the test report. Thus, the system of the 3WA air circuit breaker is completely
documented until the next inspection and maintenance.
Each test is stored in a test log file in the 3WA air circuit breaker. You can read out the
test log file using the SENTRON powerconfig configuration software. Thus, you can
always see when the 3WA air circuit breaker was last tested and what the test result
was.
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