Signals; Settings - ABB 615 series Technical Manual

Section 4
Protection functions
4.3.3.6
4.3.3.7
Table 444: 87LOZREF Group settings (Basic)
Parameter Values (Range)
Trip value 5.0...50.0
Table 445: 87LOZREF Group settings (Advanced)
Parameter Values (Range)
Minimum trip time 40...300000
Restraint mode 1=None
2=Harmonic2
Pickup value 2.H 10...50
548
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.

Signals

Table 442: 87LOZREF Input signals
Name Type
I_A SIGNAL
I_B SIGNAL
I_C SIGNAL
IG SIGNAL
BLOCK BOOLEAN
Table 443: 87LOZREF Output signals
Name Type
TRIP BOOLEAN
PICKUP BOOLEAN
BLK2H BOOLEAN

Settings

Unit Step
%In 1.0
Unit Step
ms 1
% 1
Default Description
0 Phase A current
0 Phase B current
0 Phase C current
0 Zero-sequence current
0=False Block signal for activating the blocking mode
Description
Trip
Pickup
2nd harmonic block
Default Description
5.0 Trip value
Default Description
40 Minimum trip time
1=None Restraint mode
50 The ratio of the 2. harmonic to fundamental
component required for blocking
1MAC059074-MB A
615 series ANSI
Technical Manual