GFC
release
PICKUP
TRIP
Reset
timer
Trip
timer
Reset
delay
time
Trip
delay
time
Pickup
delay
time
Pickup
delay
time
IG
VG
GUID-D2629C82-34BA-4E64-99E8-B3541D5016B4 V1 EN
Figure 216:
Operation in “General EF” mode
Operation mode “Alarming EF” is applicable in all kinds of ground faults in ungrounded
and compensated networks, where fault detection is only alarming. It is intended to detect
ground faults regardless of their type (transient, intermittent or restriking, permanent, high
or low ohmic). The setting
Voltage pickup value
defines the basic sensitivity of the 67YN
function. In “Alarming EF” mode, the operate timer is started during the following
conditions.
•
Ground fault is detected by the GFC
•
Fault direction equals
Directional mode setting
•
Estimated stabilized fundamental frequency residual current exceeds the set
Min trip
current
level
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
451
Technical Manual
Summary of Contents for Relion 615 series
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