9.21
Date Code 20081022 Instruction Manual SEL-787 Relay
Analyzing Events
Sequential Events Recorder (SER) Report
[15]
778.8 634.0 2.4 5.6 * 1. .. .. 1. ... . . .*
776.3 632.9 3.4 6.9 * 1. .. .. 1. ... . . .*
777.1 633.3 2.6 4.8 * 1. .. .. 1. ... . . .*
782.1 635.3 3.7 0.3 * 1. .. .. 1. ... . . .*
Figure 9.7 Example Standard 15-cycle Differential Event Report (EVE DIF1
Command) 1/4 Cycle Resolution
Sequential Events Recorder (SER) Report
The SER report captures relay element state changes over an extended period.
SER report data are useful in commissioning tests and root-cause analysis
studies. SER information is stored when state changes occur. The report
records the most recent 1024 state changes if a relay element is listed in the
SER trigger equations.
SER Triggering
Settings SER1 through SER4 are used to select entries in the SER report. To
capture relay element state changes in the SER report, the relay element name
must be programmed into one of the four SER trigger equations. Each of the
four programmable trigger equations allows entry of as many as 24 relay
elements; the SER report can monitor a total of 96 relay elements.
The relay adds a message to the SER to indicate power up or settings change
conditions:
Relay Powered Up
.
.
.
Relay Settings Changed
Each entry in the SER includes the SER row number, date, time, element
name, and element state.
SER Aliases
You may rename as many as 20 of the SER trigger conditions using the
ALIAS settings. For instance, the factory default alias setting 2 renames Relay
Word bit PB02 for reporting in the SER:
ALIAS2:= PB02 FP_LOCK PICKUP DROPOUT
When Relay Word bit PB02 is asserted, the SER report will show the date and
time of FP_LOCK PICKUP. When Relay Word bit PB02 is deasserted, the
SER report will show the date and time of FP_LOCK DROPOUT. With this
and other alias assignments, the SER record is easier for the operator to
review. See Relay Word Bit Aliases on page 4.107 for additional details.
Retrieving and
Clearing SER Reports
See SER Command (Sequential Events Recorder Report) on page 7.29 for
details on the SER command.
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