ABB Relion 670 Series Applications Manual page 218

Section 8
Current protection
recover above the set value. To ensure a proper reset, the function is blocked two seconds after
the trip signal is issued.
ANSI12000183 V1 EN-US
Figure 98: Undervoltage seal-in of current pickup
8.16.3 Setting guidelines
Common base IED values for the primary current (
SBase ) are set in global base values for settings function GBASVAL.
power (
GlobalBaseSel : Selects the global base value group used by the function to define IBase , VBase and
SBase . Note that this function will only use IBase value.
8.16.3.1 Explanation of the setting parameters
Operation : Set to On in order to activate the function; set to Off to switch off the complete
function.
Pickup_Curr : Operation phase current level given in % of IBase .
Characterist : Selection of time characteristic: Definite time delay and different types of inverse
time characteristics are available; see Technical Manual for details.
tDef_OC : Definite time delay. It is used if definite time characteristic is chosen; it shall be set to 0 s
if the inverse time characteristic is chosen and no additional delay shall be added. Note that the
value set is the time between activation of the start and the trip outputs.
k : Time multiplier for inverse time delay.
tMin : Minimum operation time for all inverse time characteristics. At high currents the inverse time
characteristic might give a very short operation time. By setting this parameter the operation time
of the step can never be shorter than the setting.
Operation_UV : it sets On / Off the operation of the under-voltage stage.
212
I3P*
OR
V3P*
BLOCK
BLKOC
BLKUV
OR
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VRPVOC (51V)
TRIP
I3P* TROC TRIP
V3P* TROC
27 Trip
BLOCK 27 Trip
PICKUP
BLKOC PU_OC PICKUP
BLKUV PU_OC
27 PU
27 PU
IBase ), primary voltage ( VBase ) and primary
1MRK 511 401-UUS F
Trip output
t
ANSI12000183-1-en.vsd
GUID-2AE85EC4-669E-47C0-ADD4-3DBA83581096 v3
GUID-9B777E6D-602B-4214-9170-A44ED2D725BF v3
Bay control REC670
Application manual