EDR-5000 IM02602007E
Commissioning: Loss of Potential
Object to be tested:
Testing the
LOP.
Necessary means:
Three-phase current source and
Three-phase voltage source.
Procedure part 1:
Examine if the output signals »LOP BLO « (200ms delay) and »LOP« only become true if:
•Any of the three-phase voltages becomes less 0.01*Vn Volt
and
•The residual voltage is less than 0.01*Vn Volt or the %V2/V1 ratio is greater 40%
and
•All three-phase currents are less than the load current / overcurrent detection (I<) setting.
and
•The residual current is less than 0.1 Ipu (rated current)
and
•The offline detection has not detected a dead busbar (No current, no voltage measured).
Successful test result part 1:
The output signals only become true if all the above mentioned conditions are fulfilled.
Procedure part 2:
Assign the »LOP« or »LOP BLO« output signals to all protection element that should be blocked by
LOP
(e.g.:
Undervoltage Protection, Voltage Restraint...).
Test if those elements are blocked if the LOP modules issue a blocking signal.
Successful test result part 2:
All elements that should be blocked in case of LOP are blocked if the conditions (Procedure part 1) are fulfilled.
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