Protective Elements
Commissioning of the Cold Load Pickup Module
Object to be tested:
Testing the
Cold Load Pickup
module according to the configured operating mode:
•I< (No current);
•Bkr state (Breaker position);
•I< (No Current) and Bkr state (Breaker position); and
•I< (No Current) or Bkr state (Breaker position).
Necessary means:
•Three-phase current source (if the Enable Mode depends on current);
•Ampere meters (may be needed if the Enable Mode depends on current); and
•Timer.
Test Example for Mode Bkr State (Breaker Position)
Mode I<: In order to test the tripping delay, start the timer and feed with an
abrupt change current that is distinctly less than the I<-threshold. Measure
the tripping delay. In order to measure the drop-out ratio, feed a current
with an abrupt change that is distinctly above the I<-threshold.
Mode I< and Bkr state: Combine the abrupt change (switching the current
ON and OFF) with the manual switching ON and OFF of the breaker.
Mode I< or Bkr state: Initially carry out the test with an abrupt changing
current that is switched ON and OFF (above and below the I<-threshold).
Measure the tripping times. Finally, carry out the test by manually
switching the breaker ON and OFF.
•The breaker has to be in the OFF position. There must not be any load current.
•The Status Display of the device shows the signal "CLPU.ENABLED“=1.
•The Status Display of the device shows the signal ”CLPU.I<“=1.
•
Testing the tripping delay and the resetting ratio:
•Switch the breaker manually ON and simultaneously start the timer.
•After the the »
t Max Block (Release Delay)«
timer has expired, the signal "CPLU.Enabled “=0 has to become
untrue.
•Write down the measured time.
•Manually switch the breaker OFF and simultaneously start the timer.
•After the
»t load Off«
timer has expired, the signal ”CPLU.ENABLED “=1 has to become true.
•Write down the measured time.
Successful test result:
The measured total tripping delays or individual tripping delays, threshold values, and drop-out ratios correspond
with those values specified in the adjustment list. Permissible deviations/tolerances can be found in the Technical
Data section.
877 MCDGV4 DOK-HB-MCDGV4-2E
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