Sel 411L - Page 613

Date Code 20151029 Protection Manual SEL-411L Relay
Section 8
P.Protection Manual
Oscillography, Events, and SER
The relay features comprehensive power system data analysis capabilities.
The relay provides these useful analysis tools:
➤ Data Processing on page P.8.2
➤ Triggering Data Captures and Event Reports on page P.8.4
➤ Duration of Data Captures and Event Reports on page P.8.5
➤ Oscillography on page P.8.7
➤ Event Reports, Event Summaries, and Event Histories on
page P.8.14
➤ Sequential Events Recorder (SER) on page P.8.31
➤ Signal Profiling on page P.8.33
An event is a representation of the operating conditions of the power system at
a specific time. Events include instances such as a relay trip, an abnormal
situation in the power system that triggers a relay element, or an event capture
command.
Information from oscillograms, relay event reports, and SER data are very
valuable if you are responsible for outage analysis, outage management, or
relay settings coordination.
The relay accepts an IRIG-B clock input for high-accuracy timing. When a
suitable external clock is used (such as the SEL-2407), the relay synchronizes
the data acquisition system to the received signal. Knowledge of the precise
time of sampling (as shown in COMTRADE files) allows comparisons of data
across the power system. Use a coordinated network of synchronized relays to
create moment-in-time “snapshots” of the power system. These data are useful
for determining power system dynamic voltage and current phasors,
impedances, load flow, and system states.
The relay can also perform the PMU (Phasor Measurement Unit) function of
gathering synchrophasor data when the relay is in high-accuracy timekeeping
mode (HIRIG).