4.2.3.2
Function block
TRIP
PICKUP
IG
67NIEF
VG
BLOCK
BLK_EF
GUID-F7F1D35D-8897-422C-BF6F-0559BC64100F V1 EN
Figure 168:
Function block
4.2.3.3
Functionality
The transient/intermittent ground-fault protection function 67NIEF is a function designed
for the protection and clearance of permanent and intermittent ground faults in
distribution and sub-transmission networks. Fault detection is done from the residual
current and residual voltage signals by monitoring the transients.
The operating time characteristics are according to definite time (DT).
The function contains a blocking functionality. It is possible to block function outputs,
timers or the function itself, if desired.
4.2.3.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are “Enable” and “Disable”.
The operation of 67NIEF can be described with a module diagram. All the modules in the
diagram are explained in the next sections.
TRIP
Transient
detector
BLOCK
PICKUP
IG
VG
t
Timer 1
Fault
indication
logic
Blocking
logic
Timer 2
BLK_EF
Level
detector
GUID-500A035B-0431-4278-B5ED-DD22992685E4 V1 EN
Figure 169:
Functional module diagram
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
361
Technical Manual
Содержание Relion 615 series
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