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Commissioning Example: Supervision Scheme 50BF
Object to Be Tested:
Test of the Breaker Failure protection (Supervision Scheme 50BF).
Necessary Means:
Current source;
Ammeter; and
Timer.
Procedure (Single-Phase):
For testing the tripping time of the BF protection, a test current has to be higher than the threshold value of one of the
current protection modules that are assigned to trigger the BF protection. The BF trip delay can be measured from the
time when one of the triggering inputs becomes active to the time when the BF protection trip is asserted.
To avoid wiring errors, checked to make sure the breaker in the upstream system switches off.
The time, measured by the timer, should be in line with the specified tolerances.
Successful Test Result:
The actual times measured comply with the setpoint times. The breaker in the higher-level section switches off.
When testing, the applied test current must always be higher than the
tripping threshold »I-BF« . If the test current falls below the threshold while
the breaker is in the "Off" position, no pickup will be generated.
Re-connect the control cable to the breaker!
EMR-4000
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