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•
Transient is detected by the Transient detector (indicated with
PEAK_IND
output)
•
Ground fault is detected by the GFC at time of transient
•
Fault direction equals
Directional mode
setting
•
Estimated stabilized fundamental frequency residual current exceeds the set
Min trip
current
level
When a required number of intermittent ground-fault transients set with the
Peak counter
limit
setting are detected without the function being reset (depends on the drop-off time set
with the
Reset delay time
setting), the
PICKUP
output is activated. The
INTR_EF
output
is activated to indicate the fault type is intermittent or restriking ground fault. The operate
timer is kept activated as long as transients occur during the drop-off time defined by
setting
Reset delay time
.
The
TRIP
output is activated when
Trip delay time
has elapsed, required number of
transients has been detected, ground fault is detected by the GFC, fault direction matches
the
Directional mode
setting and estimated stabilized fundamental frequency residual
current exceeds set
Minimum trip current
setting.
The
Reset delay time
starts to elapse from each detected transient. Function is reset if time
between current peaks is more that
Reset delay time
or if the General Fault Criterion
release is reset. After
TRIP
output activation,
PICKUP
and
TRIP
outputs are reset
immediately at the falling edge of General Fault Criterion release, that is, when zero-
sequence voltage falls below
Voltage pickup value
. This should be considered if
“Intermittent EF" mode is applied in case ground faults are only alarmed to avoid
repetitive pickup and trip events.
To keep the operate timer activated between current spikes during
intermittent or restriking ground fault,
Reset delay time
should be set to a
value exceeding the maximum expected time interval between (obtained
at full resonance condition). The recommended value is at least 300 ms.
Section 4
1MAC059074-MB A
Protection functions
454
615 series ANSI
Technical Manual
Содержание Relion 615 series
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