is detected. Since the voltage dependence differs between these functions,
SEQRFUF has two outputs for this purpose.
6.4.6 Signals
Table 511: SEQRFUF Input signals
Name Type Default Description
I_A SIGNAL 0 Phase A current
I_B SIGNAL 0 Phase B current
I_C SIGNAL 0 Phase C current
I
2
SIGNAL 0 Negative sequence current
U_A_AB SIGNAL 0 Phase A voltage
U_B_BC SIGNAL 0 Phase B voltage
U_C_CA SIGNAL 0 Phase C voltage
U
2
SIGNAL 0 Negative phase sequence voltage
BLOCK BOOLEAN 0=False Block of function
CB_CLOSED BOOLEAN 0=False Active when circuit breaker is closed
DISCON_OPEN BOOLEAN 0=False Active when line disconnector is open
MINCB_OPEN BOOLEAN 0=False Active when external MCB opens protected
voltage circuit
Table 512: SEQRFUF Output signals
Name
Type Description
FUSEF_3PH BOOLEAN Three-phase start of function
FUSEF_U BOOLEAN General start of function
6.4.7 Settings
Table 513: SEQRFUF Non group settings
Parameter
Values (Range) Unit Step Default Description
Operation 1=on
5=off
1=on Operation Off / On
Neg Seq current Lev 0.03...0.20 xIn 0.01 0.03 Operate level of neg seq undercurrent
element
Neg Seq voltage Lev 0.03...0.20 xUn 0.01 0.10 Operate level of neg seq overvoltage
element
Current change rate 0.01...0.50 xIn 0.01 0.15 Operate level of change in phase current
Voltage change rate 0.50...0.90 xUn 0.01 0.60 Operate level of change in phase voltage
Change rate enable 0=False
1=True
0=False Enabling operation of change based
function
Min Op voltage delta 0.01...1.00 xUn 0.01 0.70 Minimum operate level of phase voltage
for delta calculation
Table continues on next page
Section 6 1YHT530004D05 D
Supervision functions
598 615 series
Technical Manual
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