Siemens 6MD85 Manual page 1069

[dwcbch03-300913, 1, en_US]
Figure 10-6
With the Use current-flow criterion parameter, you can also specify that a circuit-breaker test is only
executed if the current flowing through the circuit breaker does not exceed a specific current threshold
(Current threshold parameter). Otherwise, the circuit-breaker test is not started.
If the current-flow criterion is disabled, the current threshold is not evaluated. Then, the circuit-breaker
²
test is performed independent of the magnitude of current flowing through the circuit breaker.
NOTE
i
i
The circuit-breaker test does not perform a synchrocheck even if the synchrocheck has been configured in
the protection-function groups for circuit breakers. This may cause stability problems in the system during a
3-pole interruption. Therefore, a 3-pole circuit-breaker test should be very short, or not performed at all
under load.
You can start the test program as follows:
•
Via the device-control panel
•
Via DIGSI
•
Via communication protocols
•
Via control commands, which you can also connect in the CFC
The following figure illustrates operation of the circuit-breaker test in DIGSI.
[sccb_1-3pol, 1, en_US]
Figure 10-7
Select the function in the project tree on the left in the online access.
²
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Progress over Time of a Circuit-Breaker Test Cycle
Circuit-Breaker Test in the Test Suite in DIGSI
Functional Tests
10.5 Circuit-Breaker Test
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