U.A.7
Date Code 20090715 User’s Guide SEL-421 Relay
Firmware and Manual Versions
Firmware
➤ Removed Time and Date Management settings from Global
settings class.
➤ Added SER CV and SER RV commands for clearing viewed
SER data.
➤ Added analog quantities CTRW, CTRX, PTRY, PTRZ, based on
the active group settings of the same name.
➤ Reduced minimum allowable pickup settings for the inverse-time
overcurrent elements to 0.05 • I
NOM
.
➤ Modified auto-reclose logic for two circuit breaker, three-pole
cycle state to include a check for enable conditions E3PR1 and
E3PR2 to properly handle reclose supervision after multi-phase
faults.
➤ Corrected error in logic for breaker monitor mechanical operating
time alarm that may have caused incorrect B1MSOAL operation.
Error introduced in firmware revision R110.
➤ Improved faulted phase identification logic performance for
isolated zero-sequence source conditions.
➤ Corrected port settings class handling of leading spaces in
M
IRRORED BITS
®
analog settings MBANAn.
➤ Reduced healthy voltage qualifying time from 15 to 6 cycles in
25ENBK1 and 25ENBK2 synchronism check enable logic.
➤ Corrected uncompensated synch check element logic for
25A1BK1, which may have caused incorrect assertion under test
conditions.
➤ Corrected issue where a conflict in DNP processing and
communications could suspend all relay communications.
➤ Corrected issue where incorrect scaling of stored values could
cause an erroneous drift in metered quantities.
➤ Corrected issue where incorrect scaling of stored values could
cause an erroneous drift in the metered slip frequency for
synchronism check.
➤ Added Security Enhancements when used with the SEL-2701
Ethernet Processor.
SEL-421-R111-V0-Z003004-D20040602
SEL-421-1-R111-V0-Z003004-D20040602
➤ Corrected issue where turning off power may cause a low-set
(less than 50% of I
NOM
) 50G or 67G element to inadvertently
operate.
➤ Corrected issue where the dc battery monitor may report incorrect
values for Vdc.
20040602
Table A.1 Firmware Revision History (Sheet 7 of 9)
Firmware Identification (FID) Number Summary of Revisions
Manual
Date Code
Courtesy of NationalSwitchgear.com
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