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The
PICKUP
output is activated once
Pickup delay time
has elapsed.
TRIP
output is not
valid in the “Alarming EF” mode. Reset timer is started if any of the above three
conditions are not valid. In case the fault is transient and self-extinguishes,
PICKUP
output stays activated until the elapse of reset timer (setting
Reset delay time
).
In case detection of temporary ground faults is not desired, the activation
of
PICKUP
output can be delayed with setting
Pickup delay time
.
To keep the operate timer activated between current spikes during
intermittent or restriking ground fault, the
Reset delay time
should be set
to a value exceeding the maximum expected time interval between fault
spikes (obtained at full resonance condition). The recommended value is
at least 300 ms.
Section 4
1MAC059074-MB A
Protection functions
452
615 series ANSI
Technical Manual
Содержание Relion 615 series
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