Sel 751A, Instruction Manual

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9.3
Date Code 20100129 Instruction Manual SEL-751A Relay
Analyzing Events
Event Reporting
detects a logical 0 to logical 1 transition, it generates an event report (if the
SEL-751A is not already generating a report that encompasses the new
transition). The factory setting is shown in
Event Report Settings on
page 4.124 .
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 7.42 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 77 of the most recent event summaries (if event
report length setting LER := 15); or, as many as 19 (if LER := 64). 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:
➤
Relay and Terminal Identification (RID and TID)
➤
Event number, date, time, event type, and frequency (see
Table 9.1 )
➤
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), optional Voltage Inputs
card required
➤
Hottest RTD temperatures, SEL-2600 RTD Module or internal
RTD card option required
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 9.3 ). The example event summary
in Figure 9.1 corresponds to the standard 15-cycle event report in Figure 9.3 .
=>>
SUM <Enter>
SEL-751A Date: 02/28/2007 Time: 13:58:23.629
FEEDER RELAY
Serial No = 2007XXXXXXXXXXX
FID = SEL-751A-R100-V0-Z001001-D20070410 CID = 5052
EVENT LOGS = 7
Event: Trigger
Targets 10000000
Freq (Hz) 60.0
Current Mag
IA IB IC IN IG
(A) 110.7 107.5 103.3 0.24 7.24
Voltage Mag
VAN VBN VCN VG
(V) 11476 11482 11503 150
=>>
Figure 9.1 Example Event Summary
IMPORTANT:
Clearing the
HISTORY report with the HIS C
command also clears all event data
within the SEL-751A event memory.
NOTE:
Figure 9.3 is on multiple
pages.