3.8 Fault recorder FLR
3.8.1 Function block
GUID-313A171A-40C7-4329-9C87-1E6A7D704479 V1 EN
Figure 21: Function block
3.8.2 Functionality
The protection relay has the capacity to store the records of 128 latest fault events. Fault
records include fundamental or RMS current values. The records enable the user to
analyze recent power system events. Each fault record (FLTRFRC) is marked with an up-
counting fault number and a time stamp that is taken from the beginning of the fault.
The fault recording period begins from the pickup event of any protection function and
ends if any protection function trips or the pickup(s) is restored before the trip event. If a
pickup is restored without a trip event, the pickup duration shows the protection function
that has picked up first.
Pickup duration that has the value of 100% indicates that a protection function has tripped
during the fault and if none of the protection functions has been tripped, Pickup duration
shows always values less than 100%.
The Fault recorded data Protection and Pickup duration is from the same protection
function. The Fault recorded data trip time shows the time of the actual fault period. This
value is the time difference between the activation of the internal pickup and trip signals.
The actual trip time also includes the pickup time and the delay of the output relay. The
Fault recorded data Breaker clear time is the time difference between internal trip signal
and activation of CB_CLRD input.
If some functions in relay application are sensitive to start frequently it
might be advisable to set the setting parameter Trig mode to “From trip”.
Then only faults that cause an trip event trigger a new fault recording.
The fault-related current, voltage, frequency, angle values, shot pointer and the active
setting group number are taken from the moment of the operate event, or from the
beginning of the fault if only a pickup event occurs during the fault. The maximum current
value collects the maximum fault currents during the fault. In case frequency cannot be
measured, nominal frequency is used for frequency and zero for Frequency gradient and
validity is set accordingly.
1MAC059074-MB A Section 3
Basic functions
615 series ANSI 93
Technical Manual
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