U.A.23
Date Code 20090715 User’s Guide SEL-421 Relay
Firmware and Manual Versions
Instruction Manual
20030918 Introduced new typographic and step instruction conventions in the Preface and applied them throughout the man-
ual.
User’s Guide
Section 1
➤ Added EA Certification statement to Specifications.
Appendix A
➤ Included information on new firmware R110 and instruction manual changes.
➤ Added EA Certification statement to Specifications.
Applications Handbook
Section 1
➤ Modified the application examples to include new information on communications-assisted protection
schemes and out-of-step logic.
Reference Manual
Section 1
➤ Added information (including new logic diagram figures) about communications-assisted protection
schemes, out-of-step logic, and trip logic.
➤ Updated Figure 1.65, Figure 1.66, and Figure 1.68.
Section 3
➤ Changed quantity of free-form protection SELOGIC.
➤ Updated Tab l e 3.6, Table 3.7, and Tab le 3.8.
Section 5
➤ Added new section on using the SEL-2600A RTD module.
Section 9
➤ Added OFF to the XC setting range.
Appendix A
➤ Added new Relay Word bits to support communications-assisted protection schemes, security, and the
SEL-2600 RTD module.
Appendix B
➤ Added analog quantities to support the SEL-2600A RTD module.
20030409
User’s Guide
Section 2
➤ Modified all of the installation instructions that include removing and reattaching the front panel to reflect
changes in the front-panel hardware.
➤ Replaced Figure 2.26 with latest rear-panel diagram.
Appendix A
➤ Included information on new firmware R109.
20021216
User’s Guide
Section 1
➤ Added Terminal Connection information.
➤ Corrected typographic error.
➤ Corrected pickup accuracy for Station DC Battery System Monitor.
Appendix A
➤ Included information on new firmware R108.
Applications Handbook
Section 1
➤ Corrected Equation 1.74.
Section 2
➤ Clarified synchrophasor measurement statement.
Table A.5 Instruction Manual Revision History (Sheet 13 of 16)
Revision Date Summary of Revisions
Courtesy of NationalSwitchgear.com
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