4 Protection Functions and Specifications
4-52
L-PRO 4000 User Manual
D02706R02.30
Swing
Recording
The relay records dynamic system responses allowing the user to analyze sys-
tem stability and to provide a larger context for fault analysis. Swing records
contain positive sequence phasor measurements and system frequency calcu-
lated at a rate of 1 phasor per cycle. Swing records can extend to 2 minutes in
duration.
The quantities recorded are:
• Positive sequence impedance (magnitude)
• Positive sequence voltage (magnitude)
• Positive sequence current (magnitude)
• 3-Phase Reactive Power (Vars)
• 3-Phase Real Power (Watts)
Event
Recording
The event recording provides permanent storage for the event log. The user can
create an event record automatically or manually. When the event auto save is
enabled, an event record is created approximately every 250 events.
The user can initiate an event manually through the Relay Control Panel.
Record
Initiation
Recording can be initiated automatically by the relay when a fault or abnormal
condition is detected. Set the relay to initiate a fault record on activation of any
of its trip or alarm functions or on assertion of any external digital inputs.
The assignment of fault record initiation to the various relay functions is done
through the relay’s Output Matrix settings.
A recording can also be initiated manually through the Relay Control Panel.
The commands Trigger Fault, Trigger Swing and Trigger Event are available
under the following path:
Relay Control Panel > Records
Also the relay display provides the option to initiate Fault Recording, under the
following path:
Main Menu > Records > Fault Recording
A swing record can take a couple of minutes to produce due to the
long post-trigger time.
Summary of Contents for L-PRO 4000
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