Eaton EMR-4000 Installation, Operation And Maintenance Manual page 791

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 B
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 2 * Ipu (rated current)
•
and
The residual current is less than 0.1 Ipu (rated current)
•
and
No pickup of an IOC element (No pickup of a 50P[x] element)
•
and
The breaker is closed (Information from the Breaker module).
•
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 B
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.
« (200ms delay) and »LOP« only become true if:
LO
« output signals to all protection element that should be blocked by LOP (e.g.:
LO
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