U.A.8
SEL-421 Relay User’s Guide Date Code 20090715
Firmware and Manual Versions
Firmware
SEL-421-R110-V0-Z003004-D20030918
SEL-421-1-R110-V0-Z003004-D20030918
➤ Added fast message protocol compatibility with the SEL-2600
RTD Module.
➤ Improved distance elements.
➤ Improved out-of-step logic.
➤ Increased free-form protection SELOGIC capacity from 100 lines
to 250 lines.
➤ Improved cross-country fault detection.
➤ Added high-speed distance elements to the Relay Word.
➤ Improved relay security features, including the addition of the
BADPASS Relay Word bit.
➤ Increased number of SELOGIC math variables displayed from 16
to all.
➤ Addressed condition in which if IRIG-B time source is used and
the date rolls over from December 31st to January 1st, the year
may not increment.
➤ Corrected file command error message.
➤ Fixed condition where the SEL-421 does not send the fast
message power-up bit in the status byte of the first message.
➤ Fixed condition in R109 where a file read of events or
compressed history using the no modem option may cause the
relay to become non-responsive.
➤ Fixed condition where significant communications traffic, i.e.,
M
IRRORED BITS at 38400 baud with an SEL-2701 Ethernet card
installed, may cause delays in servicing of low-priority
background tasks.
20030918
SEL-421-R109-V0-Z002003-D20030409
SEL-421-1-R109-V0-Z002003-D20030409
➤ Fixed condition where inverse-time overcurrent protection does
not operate for multiples of pickup setting greater than 50 when
U1, U2, U3, U5, C1, or C5 characteristic is selected.
20030409
SEL-421-R108-V0-Z002003-D20021216
SEL-421-1-R108-V0-Z002003-D20021216
➤ Fixed condition where protection and automation latch elements
may not restore to previous set state after loss of power.
20021216
SEL-421-R107-V0-Z002003-D20020918
SEL-421-1-R107-V0-Z002003-D20020918
➤ Modified handling of RTS signal with DNP protocol to properly
act as a transmit enable with a non-zero PREDLY setting.
➤ Enabled MIRRORED BITS communications loopback function.
➤ Added enable condition to pole open logic so that single-pole
open (SPO) indication does not operate for three-pole trip
applications.
20020918
SEL-421-R106-V0-Z002003-D20020819
SEL-421-1-R106-V0-Z002003-D20020819
➤ Corrected issue that causes front-panel display and serial port to
simultaneously lock up during settings save/rotating display
change.
➤ Corrected OFF value for phase-to-phase, phase-to-ground, and
ground quadrilateral distance zones.
➤ Corrected KEY1 and KEY3 pulse during relay warm start.
➤ Paused unsolicited Sequence of Events message during a file
transfer.
➤ Corrected the default value for the Ground Detection Factor for
DC Monitor 1.
20020819
SEL-421-R105-V0-Z002003-D20020621
SEL-421-1-R105-V0-Z002003-D20020621
➤ Updated values stored in the meter region of the communications
card database to be stored in volts rather than kilovolts.
➤ Updated values stored in the meter region of the communications
card database to be stored in volts rather than kilovolts.
20020621
SEL-421-R104-V0-Z002002-D20020528
SEL-421-1-R104-V0-Z002002-D20020528
➤ Corrected issue with update of Object 1 status for Object 2 default
map indices over 800.
➤ Increased DNP event buffer for Object Type 2 to 1024 from 512.
20020528
Table A.1 Firmware Revision History (Sheet 8 of 9)
Firmware Identification (FID) Number Summary of Revisions
Manual
Date Code
Courtesy of NationalSwitchgear.com
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