EDR-5000
IM02602007E
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.
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