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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
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