Generally, 21FL requires a minimum of two fundamental cycles of measuring time after
the fault occurrence.
illustrates typical behavior of fault distance estimate of
21FL as a function of time.
•
Immediately after the fault occurrence, the estimate is affected by initial fault
transients in voltages and currents.
•
Approximately one fundamental cycle after the fault occurrence, the fault distance
estimate starts to approach the final value.
•
Approximately two fundamental cycles after the fault occurrence, the stability
criterion for fault distance estimate is fulfilled and the TRIGG_OUT event is sent.
The recorded data values are stored at this moment.
GUID-2C1E2C55-B61A-4200-BC8E-0F6FC9036A56 V3 EN
Figure 421:
The behavior of fault distance estimate in time
5.7.4.4
Alarm indication
21Fl contains an alarm output for the calculated fault distance. If the calculated fault
distance FLT_DISTANCE is between the settings
Low alarm Dis limit
and
High alarm
Dis limit
, the
ALARM
output is activated.
The
ALARM
output can be utilized, for example, in regions with waterways or other places
where knowledge of certain fault locations is of high importance.
1MAC059074-MB A
Section 5
Protection related functions
615 series ANSI
823
Technical Manual
Summary of Contents for Relion 615 series
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