Signals; Settings - ABB RELION 620 Series Technical Manual

1MAC504801-IB E
4.6.3.6
4.6.3.7
Table 352: 87LOZREF Group settings
Parameter Values (Range)
Trip value 5...50
Minimum trip time 40...300000
Restraint mode 1=None
2=Harmonic2
Pickup value 2.H 10...50
Table 353: 87LOZREF Non group settings
Parameter Values (Range)
Operation 1=enable
5=disable
Reset delay time 0...60000
CT connection type 1=Type 1
2=Type 2
620 series ANSI
Technical Manual
Blocking the starting of the restricted ground-fault protection at the magnetizing inrush is
based on the ratio of the second harmonic and the fundamental frequency amplitudes of
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 350: 87LOZREF Input signals
Name Type
I_A SIGNAL
I_B SIGNAL
I_C SIGNAL
I SIGNAL
0
BLOCK BOOLEAN
Table 351: 87LOZREF Output signals
Name Type
TRIP BOOLEAN
PICKUP BOOLEAN
BLK2H BOOLEAN

Settings

Unit Step
%In 1
ms 1
%In 1
Unit Step
ms 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 Trip value
40 Minimum trip time
1=None Restraint mode
50 The ratio of the 2. harmonic to fundamental
component required for blocking
Default Description
1=enable Operation Disable / Enable
20 Reset delay time
2=Type 2 CT connection type
Section 4
Protection functions
465