Reset
time
Voltage
pickup
value
PICKUP
Transient
detection
VG >
Reset
timer
Res
et
tim
e
TRIP
Trip
delay
time
Reset
delay
time
Residual
voltage
VG
Residual
current
IG
Fault
direction
FWD
FWD
GUID-63841048-C490-4262-8840-EA06FD46E68C V1 EN
Figure 170:
Example of 67NIEF operation in ”Transient EF” mode in the faulty feeder
In the "Intermittent EF" mode the
TRIP
output is activated when the following conditions
are fulfilled:
•
the number of transients that have been detected exceeds the
Peak counter limit
setting
•
the timer has reached the time set with the
Trip delay time
•
and one additional transient is detected during the drop-off cycle
The
Reset delay time
starts to elapse from each detected transient (peak). In case there is no
TRIP
activation, for example, the fault disappears momentarily
PICKUP
stays activated
until the
Reset delay time
elapses, that is, reset takes place if time between transients is
more than
Reset delay time
. After
TRIP
activation, a fixed pulse length of 100 ms for
TRIP
is given, whereas
PICKUP
is reset after
Reset delay time
elapses
Section 4
1MAC059074-MB A
Protection functions
364
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
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