ABB 615 Series - Page 459

GFCrelease
PICKUP
TRIP
Resettimer
Triptimer
Resetdelaytime
Pickupdelaytime
Pickupdelaytime
IG
VG
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.
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 453
Technical Manual