Eaton EDR-5000 Nstallation, Operation And Maintenance Manual page 796

A minimum current supervision (I1 min) in the positive phase sequence system prevents unwanted operation of the
active-power supervision at lower power levels.
The release voltages determines from which voltage (line-to-line) on the UFLS will be released.
When using the power angle supervision (method 1):
Select » UFLS method = Power Angle Supervision.«
Set the angle » Power Angle« .
Select a suitable minimum current » I1 min« which prevents false tripping.
When using the pure active power supervision (method 2):
Select »UFLS method= Pure Active Power Superv.«
Set the active power threshold »P min « .
Select a suitable minimum current » I min« to prevent false tripping.
When the active power flow direction should not be taken into account (Method 3 – classical load shedding)
Set the parameter » UFLS method = No Pdir / Ex Pdir« .
When the active power flow direction indicated by an external signal (Method 4)
This might be used if no appropriate voltage transformers are available.
Set the parameter » UFLS method = No Pdir / Ex Pdir« .
Assign within menu [Protection Para/Global Prot Para/UFLS] onto parameter » Ex Pdir« a signal that indicates
the active power flow direction.
Under frequency threshold and tripping delay
The following parameters can be used as adaptive parameters in order to establish a non-discriminating load shedding
(please refer to section non-disrcriminating load shedding by means of adaptive parameters)
Set the under frequency threshold f<
Set the tripping delay » t-UFLS« . This timer will be started if the ULFS module is alarmed.
EDR-5000
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