Schweitzer Engineering Laboratories SEL-421-4, Instruction Manual

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10.5
Date Code 20171021 Instruction Manual SEL-421 Relay
Communications Interfaces
Communications Database
The TARGET region contains the entire visible Relay Word plus the rows desig-
nated specifically for the TARGET region. This region is updated every 0.5 sec-
onds. See
Table 10.5 for the Map. See Section 11: Relay Word Bits for detailed
information on the Relay Word bits.
The HISTORY region contains all information available in a History report for
the most recent 10 events. This region is updated within 15 seconds of any new
events. See
Table 10.6 for the Map.
The BREAKER region contains some of the information available in a summary
Breaker report. This region is updated every 15 seconds. See
Table 10.7 for the
Map.
Table 10.5 SEL-421 Database Structure—TARGET Region
Address
(Hex)
Name Type Description
3000 _YEAR int Four-digit year when data were sampled
3001 DAY_OF_YEAR int 1–366 day when data were sampled
3002 TIME(ms) long int Time of day in ms when data were sampled
(0–86,400,000)
3004 TARGET char[~240] Entire Relay Word with bit labels
Table 10.6 SEL-421 Database Structure—HISTORY Region
Address
(Hex)
Name Type Description
4000 _YEAR int Four-digit year when data were sampled
4001 DAY_OF_YEAR int 1–366 day when data were sampled
4002 TIME(ms) long int Time of day in ms when data were sample
(0–86,400,000)
4004 REF_NUM int[10] Event serial number
400E MONTH int[10] Month of event
4018 DAY int[10] Day of event
4022 YEAR int[10] Year of event
402C HOUR int[10] Hour of event
4036 MIN int[10] Minute of event
4040 SEC int[10] Second of event
404A MSEC int[10] Milliseconds of event
4054 EVENT char[60] Event type string
4090 GROUP int[10] Active group during fault
409A FREQ float[10] System frequency at time of fault
40AE TARGETS char[160] System targets from event
414E FAULT_LOC float[10] Fault location
4162 SHOT int[10] Recloser shot counter (sum of 1-pole and 3-pole)
416C SHOT_1P int[10] Single-pole recloser counter
4176 SHOT_3P int[10] Three-pole recloser counter
4180 CURR int[10] Fault current in primary amperes