available
– not available
O optional
WL Circuit Breaker
Function overview of the electronic trip units
677UTE847UTEsnoitcnuF cisaB
Parameter sets
Selectable between
parameter set A and B –
LCD
LCD, alphanumeric (4-line)
O –
–cihparg ,DCL
Communication
CubicleBUS integrated
Communication capability via
MODBUS or PROFIBUS
Metering function
Metering function capability with
Metering Function or
Metering Function PLUS
Display by LED
Trip unit active
Alarm
ETU error
L trip
S trip
-pirt I
N trip
G trip
(only with ground fault module) (only with ground fault module)
G alarm (only with ground fault module) (only with ground fault module)
Tripped by extended protection or
protective relay function
Communication
Signal contacts with external CubicleBUS modules
(opto or relay)
Overcurrent warning
Load shedding OFF/ON
Early signal of lon
g time trip (200ms)
Temperature alarm
Phase unbalance
Instantaneous trip
Short-time trip
Long-time trip
Neutral conductor trip
Ground fault protection trip
(only with ground fault module) (only with ground fault module)
Ground fault alarm (only with ground fault module) (only with ground fault module)
Auxiliary relay
ETU error
Protective Relaying Pick-up Accuracy
Phase Unbalance (I) 2% (5…50% I
n
)
Phase Unbalance (V) 2% (5…50% V
n
)
THD (I) +/- 3% (80…120% V
n
)
THD (V) +/- 3% (80…120% V
n
)
Overvoltage +/- 2% (80…120% V
n
)
Undervoltage +/- 2% (80…120% V
n
)
Under/Over Frequency +/- 0.1 Hz
Metering and Protective Relaying Accuracies
Metering Values Accuracy
(I) at 1 x I
n
+/- 1%
(V) at 1 x V
n
+/- 0.5%
(P) at 1x I
n
+/- 3%
(S) at 1 x I
n
+/- 2%
(Q) at 1 x I
n
+/- 3%
-
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