U.A.26
SEL-421 Relay User’s Guide Date Code 20090715
Firmware and Manual Versions
Instruction Manual
Reference Manual
Section 1
➤ Added Notes to flag the differences in the SEL-421-1 Relay.
➤ Included more explanation for settings ALTI and ALTV in Current and Voltage Source Selection.
➤ Corrected setting ORDER text in ORDER.
➤ Supplemented Series-Compensation Line Logic material.
Section 3
➤ Added Notes to flag the differences in the SEL-421-1 Relay.
Section 6
➤ Updated setting TIMERQ to reflect correct prompt and default (no change in the relay).
Section 9
➤ Added Notes to flag the differences in the SEL-421-1 Relay.
Appendix A
➤ Added Notes to flag the differences in the SEL-421-1 Relay.
Index
➤ Added index entries for configurable front-panel labels, SEL-421-1 Relay, and series-compensated line.
20010703 Initial version.
Table A.5 Instruction Manual Revision History (Sheet 16 of 16)
Revision Date Summary of Revisions
Courtesy of NationalSwitchgear.com
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