ABB 615 series Technical Manual page 370

Section 4
Protection functions
364
Voltage pickup value
Transient detection
Fault direction
VG >
Reset timer
PICKUP
TRIP
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
Residual voltage VG
Residual current IG
FWD FWD
Reset time
Reset delay time
Trip delay time
1MAC059074-MB A
Res
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615 series ANSI
Technical Manual