U.A.5
Date Code 20090715 User’s Guide SEL-421 Relay
Firmware and Manual Versions
Firmware
SEL-421-R115-V0-Z006006-D20051107
SEL-421-1-R115-V0-Z006006-D20051107
Note: This firmware version requires the use of R108 or later firmware
on any installed SEL-2701 Ethernet card.
➤ Added DNP3 LAN/WAN support when using the SEL-2701
Ethernet Card.
➤ The STATUS A command will now include information on how
many Telnet sessions are active.
➤ Added second file transfer session to allow access to SEL-2701
settings files (SET_DNPn.TXT) via FTP.
➤ Fixed the Trip Unlatch logic to ignore 52AA2 logic when
NUMBK =1.
➤ SET_DNPn.TXT files from the SEL-2701 are now available in
the relay file system and can be accessed via FTP or the ASCII
FILE command.
➤ Added time-stamped SER data from the relay into TARGET
region of the SEL-2701 DNP3 database.
➤ Fixed IRIG/HIRIG time synchronization problem to properly
lock onto the incoming time signal after a year rollover.
➤ Enhanced the LOP logic to accommodate a corner case scenario.
If SPO bit is set to three-pole tripping and 52AAn status shows
breaker is open, even though it is closed (due to removing dc or
settings mistake) and phase current is below the open pole
detection then LOP will assert.
➤ Enhanced the PORT 5 command to allow transparent access to
the SEL-2701 user interface from the host relay.
20051107
SEL-421-R114-V0-Z005005-D20050805
SEL-421-1-R114-V0-Z005005-D20050805
➤ Adjusted processing to make synchrophasor analog quantities
contemporaneous with streamed synchrophasor data.
➤ Improved POTT logic to speed up tripping in WIF applications
(ELOP := Y1).
➤ Added independent two-breaker reclosing (E79 := Y1).
➤ Added single- and three-pole open interval supervision condition
logic (SPOISC, SPOISD, 3POISC, 3POISD).
➤ Corrected issue where momentary setting of LOP can slow down
tripping in WIF applications (ELOP = Y1).
➤ Expanded front-panel target rows from 255 to 323.
➤ Removed scaling from floating point phasor magnitudes per
IEEE C37.118.
➤ Adjusted Second-of-Century (SOC) to Universal-Time-
Coordination (UTC) rather than local time.
➤ Corrected issue where incoming IRIG/HIRIG data is ignored for
two minutes after a year rollover.
➤ Provided autoscaling of voltage magnitudes on front-panel HMI.
➤ Corrected issue where daylight savings time (DST) or UTC offset
(TUTC) assertion could corrupt SOC value.
20050805
SEL-421-R113-V0-Z004005-D20050119
SEL-421-1-R113-V0-Z004005-D20050119
➤ Improvements for manufacturability. This firmware includes all
of the enhancements listed under R112, below.
20050119
Table A.1 Firmware Revision History (Sheet 5 of 9)
Firmware Identification (FID) Number Summary of Revisions
Manual
Date Code
Courtesy of NationalSwitchgear.com
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