ABB 615 series Technical Manual page 459

1MAC059074-MB A
615 series ANSI
Technical Manual
VG
IG
GFC release
Trip timer
Reset timer
PICKUP
TRIP
Reset delay time
Pickup delay time
GUID-8ED1EC6A-214F-4837-A8BA-EBDA8299F785 V1 EN
Figure 217: Operation in "Alarming EF" mode
Operation mode "Intermittent EF" is dedicated for detecting restriking or intermittent
ground faults. A required number of intermittent ground fault transients set with the Peak
counter limit setting must be detected for operation. Therefore, transient faults or
permanent faults with only initial fault ignition transient are not detected in "Intermittent
EF" mode. The application of "Intermittent EF" mode is limited to low ohmic intermittent
or restriking ground faults.
In the "Intermittent EF" mode, the operate timer is started when the following conditions
are met.
Pickup delay time
Section 4
Protection functions
453