Directional Ground-Fault Protection 67/51N, 67/50N; Identification; Function Block; Functionality - ABB 615 series Technical Manual

Section 4
Protection functions
4.2.2
4.2.2.1
4.2.2.2
4.2.2.3
4.2.2.4
326

Directional ground-fault protection 67/51N, 67/50N

Identification

Function description
Directional ground-fault protection, low
stage
Directional ground-fault protection, high
stage

Function block

67/51N
IG TRIP
PICKUP
VG
I
2
U
2
BLOCK
ENA_MULT
RCA_CTL
GUID-7CA3F40E-E448-4D5D-8D1C-59F2D1DDF29C V1 EN
Figure 150: Function block

Functionality

The directional ground-fault function 67/51N, 67/50N is used as directional ground-fault
protection for feeders.
The function picks up and trips when the operating quantity (current) and polarizing
quantity (voltage) exceed the set limits and the angle between them is inside the set
operating sector. The trip time characteristic for low stage (DEFLPDEF) and high stage
(DEFHPDEF) can be selected to be either definite time (DT) or inverse definite minimum
time (IDMT).
In the DT mode, the function trips after a predefined trip time and resets when the fault
current disappears. The IDMT mode provides current-dependent timer characteristics.
The function contains a blocking functionality. It is possible to block function outputs,
timers or the function itself, if desired.

Operation principle

The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are "Enable" and "Disable".
IEC 61850 IEC 60617
identification identification
DEFLPDEF I0> ->
DEFHPDEF I0>> ->
67/50N
TRIP
IG
PICKUP
VG
I
2
U
2
BLOCK
ENA_MULT
RCA_CTL
1MAC059074-MB A
ANSI/IEEE C37.2
device number
67/51N
67/50N
615 series ANSI
Technical Manual