A.8
SEL-421 Relay Instruction Manual Date Code 20171021
Firmware, ICD File, and Manual Versions
Firmware
➤ Added web server capability to relays equipped with Ethernet.
➤ Improved relay password change management.
➤ Added mho Relay Word bits.
➤ Improved Ethernet communication when using UDP.
➤ Added Relay Word bits for relay access and main board jumper status.
➤ Added ACSELERATOR QuickSet template storage in relay nonvolatile
memory.
➤ Relay will now show the DNP settings labels for DNP Maps 1–5.
➤ Added EPORT setting to relay front serial port (PORT F).
➤ Improved undervoltage supervision for frequency (81) elements.
➤ Added Ethernet card IP address to front-panel HMI relay configuration
information.
➤ Increased number of analog quantities available to DNP reference map.
➤ SELBOOT was updated to S208 from S205.
➤ Added code to restart the relay in case of FPGA FAILURE.
➤ Changed the operating quantity for frequency tracking and undervoltage
supervision from the positive-sequence voltage to the alpha component
voltage. This change impacts the 81UVSP setting by a factor of 1.5 •2
for three-phase voltages (see Undervoltage Supervision Logic on
page 5.17 for more information).
➤ Updated the DNP Fault Time values so they can no longer report incor-
rect time stamps.
➤ Added over- and under-voltage elements.
SEL-421-4-R309-V0-Z014013-D20110923
SEL-421-5-R309-V0-Z014013-D20110923
➤ Improved performance of the Ethernet port.
➤ Reduced DNP current magnitude zeroing from 5% to 0.5% of I
NOM
.
20110923
SEL-421-4-R307-V0-Z014013-D20110628
SEL-421-5-R307-V0-Z014013-D20110628
➤ Fixed the relay file system to handle all errors that can happen during
FTP file transfers, including those that may occur with simultaneous
relay SHO or SET commands.
20110628
SEL-421-4-R306-V0-Z014013-D20101221
SEL-421-5-R306-V0-Z014013-D20101221
➤ Corrected a problem where the relay would not accept different CTRW
and CTRX ratio settings.
20101221
SEL-421-4-R305-V0-Z014013-D20100917
SEL-421-5-R305-V0-Z014013-D20100917
➤ Improved out-of-step handling during single pole-open condition. 20100917
SEL-421-4-R303-V0-Z014013-D20100520
SEL-421-5-R303-V0-Z014013-D20100520
➤ Improved the phase selection logic of the quadrilateral distance element. 20100520
SEL-421-4-R302-V0-Z013012-D20100319
SEL-421-5-R302-V0-Z013012-D20100319
➤ Corrected A-Phase analog quantity. 20100319
SEL-421-4-R301-V0-Z013012-D20100308
SEL-421-5-R301-V0-Z013012-D20100308
➤ Initial version. 20100308
Table A.1 Firmware Revision History (Sheet 7 of 7)
Firmware Identification (FID) Number Summary of Revisions
Manual
Date Code
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