10.3
Date Code 20170927 Instruction Manual SEL-751 Relay
Analyzing Events
Event Reporting
Relay Word Bit TR
Refer to Figure 4.79. If Relay Word bit TR asserts to logical 1, an event report
is automatically generated. Thus, any Relay Word bit that causes a trip does
not
have to be entered in SELOGIC control equation setting ER.
Programmable SELOGIC Control Equation Setting ER
The programmable SELOGIC control equation event report trigger setting ER
is set to trigger event reports for conditions other than trip conditions (see
SET R in SET Command (Change Settings) on page 7.47). When setting ER
detects a logical 0 to logical 1 transition, it generates an event report (if the
SEL-751 is not already generating a report that encompasses the new
transition). The factory setting is shown in Event Report Settings on
page 4.207.
TRI (Trigger Event Report) Command
The sole function of the TRI serial port command is to generate event reports,
primarily for testing purposes. See TRIGGER Command (Trigger Event
Report) on page 7.57 for more information on the TRI (Trigger Event Report)
command.
Event Summaries
For every triggered event, the relay generates and stores an event summary.
The relay stores as many as 70 of the most recent event summaries (if event
report length setting LER := 15), as many as 17 (if LER := 64), or as many as
6 (if LER := 180). When the relay stores a new event summary, it discards the
oldest event and event summary if the event memory is full. Event summaries
contain the following information:
➤ The relay and terminal identification (RID and TID)
➤ The event number, unique event reference number, date, time,
event type, fault location, and frequency (see Table 10.1)
➤ The primary magnitudes of line, neutral and residual currents
➤ The primary magnitudes of the line-to-neutral voltages and
residual voltage (if DELTA_Y := WYE) or phase-to-phase
voltages (if DELTA_Y := DELTA)
➤ The hottest RTD temperatures
The relay includes the event summary in the event report. The identifiers, date,
and time information are at the top of the event report, and the remaining
information follows at the end (See Figure 10.3). The example event summary
in Figure 10.1 corresponds to the standard 15-cycle event report in
Figure 10.3.
=>>SUM <Enter>
SEL-751 Date: 02/03/2015 Time: 10:51:34.267
FEEDER RELAY
Serial No = 000000000000000
FID = SEL-751-X272-V0-Z006002-D20150103 CID = 2038
EVENT LOGS = 5
REF_NUM = 10016
Event: BG T
Location 64.2
Targets 11100001
Freq (Hz) 60.0
Figure 10.1 Example Event Summary
IMPORTANT: Clearing the
HISTORY report with the HIS C or
HIS CA commands also clears all event
data within the SEL-751 event
memory.
NOTE: The HIS CA command resets
the unique event reference number
to 10000.
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