9.3
Date Code 20080918 Instruction Manual SEL-749M Relay
Analyzing Events
Event Reporting
Relay Word Bit TRIP
Refer to Figure 4.20. 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 SEL
OGIC 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 Table 7.41). When setting ER detects a logical 0 to logical 1
transition, it generates an event report (if the SEL-749M is not already
generating a report that encompasses the new transition). The factory setting is
shown in Table 4.49.
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 U.7.28 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 the most recent 22 (if event report length setting LER := 15)
or 4 (if LER := 64) event summaries. 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 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 required
The relay includes the event summary in the event report. The identifiers, date,
and time information is 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.
NOTE: Clearing the HISTORY report
with the HIS C command also clears all
event data within the SEL-749M event
memory.
NOTE: Figure 9.3 is on multiple
pages.
Courtesy of NationalSwitchgear.com
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