ABB 615 Series - Settings; Signals

the neutral current IG_2H / IG. Typically, the second harmonic content of the neutral
current at the magnetizing inrush is higher than that of the phase currents.
4.3.3.6 Signals
Table 442: 87LOZREF 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
IG SIGNAL 0 Zero-sequence current
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
Table 443: 87LOZREF Output signals
Name Type Description
TRIP BOOLEAN Trip
PICKUP BOOLEAN Pickup
BLK2H BOOLEAN 2nd harmonic block
4.3.3.7 Settings
Table 444: 87LOZREF Group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Trip value 5.0...50.0 %In 1.0 5.0 Trip value
Table 445: 87LOZREF Group settings (Advanced)
Parameter
Values (Range) Unit Step Default Description
Minimum trip time 40...300000 ms 1 40 Minimum trip time
Restraint mode 1=None
2=Harmonic2
1=None Restraint mode
Pickup value 2.H 10...50 % 1 50 The ratio of the 2. harmonic to fundamental
component required for blocking
Section 4 1MAC059074-MB A
Protection functions
548 615 series ANSI
Technical Manual