10.34
SEL-751 Relay Instruction Manual Date Code 20170927
Analyzing Events
High-Impedance Fault (HIF) Event Reporting
below the blank row are no longer in relay memory; these events appear in the
history report to indicate past power system performance. The relay does not
ordinarily modify the numerical or time order in the history report.
Viewing the HIF Event History
Access the history report from the communications ports by using the
HIS HIF command or the analysis menu within QuickSet. View and
download history reports from Access Level 1 and higher.
Use the HIS HIF command from a terminal to obtain the event history. You
can specify the number of the most recent events that the relay returns.
CHISTORY HIF
The SEL-751 provides Compressed ASCII event reports to facilitate event
report storage and display. SEL communications processors and the
ACSELERATOR Analytic Assistant take advantage of the Compressed ASCII
format. Use the CHIS HIF command to display Compressed ASCII event
history information.
High-Impedance Fault
Compressed Event
Report
The SEL-751 provides Compressed ASCII event reports to facilitate event
report storage and display. SEL communications processors and the
ACSELERATOR Analytic Assistant take advantage of the Compressed ASCII
format. Use the CEV HIF command to display Compressed ASCII HIF event
reports.
The relay generates compressed event reports to display analog data, and the
state of related Relay Word bits from the odd and nonharmonic HIF fault
detection algorithm and load reduction.
The relay provides user-programmable event report triggering conditions. An
event report is triggered for all conditions listed in the Summary HIF
command. When an event report is triggered for any of these conditions,
asserts Relay Word bit HIFREC, which stays asserted until the HIF event
Table 10.10 HIS HIF Command
Command Description
HIS HIF Return event histories with the oldest at the bottom of the list
and the most recent at the top of the list.
HIS HIF k Return the k most recent event summaries with the oldest at the
bottom of the list and the most recent at the top of the list.
HIS HIF C or R Clears the event and the event identifier is unaffected.
HIS HIF CA or RA Clears HIF event and history, also resets the event identifier so
that the next event generated has event identifier 10000.
=>>CHIS HIF <Enter>
"FID","0143"
"FID=SEL-751-X141-V0-Z001001-D20150315","08A3"
"REC_NUM","REF_NUM","MONTH","DAY","YEAR","HOUR","MIN","SEC","MSEC","EVENT","D
OWN
ED CONDUCTOR","GRP","184C"
1,10033,3,16,2011,15,57,17,900,"HIF Fault A,B","NO",2,"0B82"
2,10032,3,16,2011,15,53,21,727,"HIF Fault A,B","NO",2,"08EE"
3,10031,3,16,2011,14,29,24,269,"HIF Fault A,B","NO",1,"08F3"
4,10030,3,16,2011,13,57,55,952,"HIF Fault A,B","NO",1,"08F6"
5,10029,3,16,2011,12,41,59,983,"HIF Fault A,B","NO",1,"08FF"
Figure 10.14 Sample Compressed HIF History Report
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