9-2
Event Reports and Sequential Events Reporting
Date Code 20010521
SEL-387E Instruction Manual
Changing the LER and/or PRE settings has no effect on previously stored nonvolatile reports.
Standard Event Report Triggering
The relay triggers (generates) a standard 15-, 29-, or 60-cycle event report when any of the
following occurs:
Relay Word bits TRIP1 through TRIP4 assert
Relay Word bits CLS1 through CLS3 assert
Programmable SEL
OGIC
®
control equation setting ER asserts to logical 1
PULSE
serial port/front-panel command executed for output contacts
TRIGGER
serial port command executed
Relay Word Bits TRIP1–TRIP4, CLS1–CLS3
Relay Word bits TRIPn (n = 1, 2, 3, or 4) would usually be assigned to an output contact for
tripping a circuit breaker (e.g., setting OUT101 = TRIP1). SEL
OGIC
control equation settings
TRn initiate the Trip Logic and control the assertion of Relay Word bits TRIPn (see Figure 5.7).
The Relay Word bit OCm (m = 1, 2, 3), initiated by the “Open breaker m” serial port command
OPE m
or the front-panel CNTRL/Open command, would normally be assigned to TRm.
Similarly, Relay Word bits CLSm (m = 1, 2, 3) would be assigned to an output contact for
closing a circuit breaker (e.g., setting OUT105 = CLS1). SEL
OGIC
control equation settings
CLm initiate the Close Logic and control the assertion of Relay Word bits CLSm (see Figure
5.8). The Relay Word bit CCm, initiated by the “Close breaker m” serial port command
CLO m
or the front-panel CNTRL/Close command, would normally be assigned to CLm.
Any condition that is set to trip in setting TRn, or to close in setting CLm, does not have to be
entered in SEL
OGIC
control equation setting ER. The assertion of Relay Word bit TRIPn or
CLSm automatically triggers a standard 15-, 29-, or 60-cycle event report.
Programmable SEL
OGIC
Control Equation Setting ER
The SEL
OGIC
control equation setting ER is set to trigger standard 15-, 29-, or 60-cycle event
reports for conditions other than tripping or closing conditions already listed in settings TRn or
CLm. When setting ER sees a logical 0 to logical 1 transition, it generates an event report (if it
is not already generating a report that encompasses the new transition). The factory setting is:
ER = /50P11 + /51P1 + /51Q1 + /51P2 + /51Q2 + /51P3
ER is factory set with definite-time and inverse-time overcurrent element pickups for phase- and
negative-sequence quantities on Windings 1, 2, and 3. Thus, at the inception of a fault,
whichever pickup asserts first will trigger a standard 15-, 29-, or 60-cycle event report.
Note the rising-edge operator symbol (/) in front of each of these elements. See
Section 4:
Control Logic
for more information on rising-edge operators and SEL
OGIC
control equations in
general.
Rising-edge operators are especially useful in generating an event report at fault inception, then
generating another event report later if a breaker trips on some time-delayed element.
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