U.A.22
SEL-421 Relay User’s Guide Date Code 20090715
Firmware and Manual Versions
Instruction Manual
Reference Manual
Section 1
➤ Updated Current and Voltage Source Selection, including new Figure 1.1 through Figure 1.4, and new
Table 1.1 through Tabl e 1.3.
➤ Updated Frequency Estimation, and added rate-of-change-of-frequency, DFDT, to Table 1.13 and
Figure 1.12.
➤ Added Time-Error Calculation.
➤ Updated pickup setting range for Inverse-Time Overcurrent Elements in Table 1.57.
➤ Renamed and clarified Trip During Open-Pole Time Delay.
Section 2
➤ Reorganized subsections.
➤ Clarifications made to Figure 2.10 and Figure 2.11. Updated Figure 2.15 to reflect changes made to the two
circuit breaker, three-pole auto-reclose logic.
➤ Added Voltage Checks for Auto-Reclosing and Manual Closing (in place of previous Voltage Checks
subsection).
➤ Reduced healthy voltage qualifying time from 15 to 6 cycles in Figure 2.28.
Section 3
➤ Added Multiple Setting Groups subsection to describe this feature already in the SEL-421.
Section 4
➤ Updated Tab l e 4.1 and Figure 4.2.
Section 5
➤ Updated Tab l e 5.2.
➤ Added Automatic Messages and Timeout subsections to describe these features already in the SEL-421.
➤ Removed Fast Message Synchrophasor information—now covered in Section 7.
Section 6
➤ Updated Tab l e 6.10 to include analog quantity information, and the new TECORR value (Object 40, 41;
Index 1).
➤ Updated Application Example to show DNP Map settings entry, including custom scaling.
Section 7
➤ Added new Section 7: Synchrophasors. Includes information on both IEEE C37.118 and SEL Fast Message
synchrophasor protocols.
Section 9
➤ Updated MET PM command description.
➤ Added SER CV, SER RV, and TEC commands.
Section 10
➤ Removed Global settings for Time and Date Management.
➤ Added Global settings for INT4 I/O Interface Board (Table 10.5, Table 10.8, and Table 10.10), Time-Error
Calculation (Table 10.12), and Synchrophasors (Table 10.3 and Table 10.14).
➤ Updated Group settings 51S1P, 51S2P, 51S3P (Table 10.50 through Table 10.52).
➤ Added PMU protocol option to Port settings (Table 10.90).
➤ Removed Port settings PMADDR and PMDATA.
Appendix A
➤ Updated tables with new Relay Word bits, and new row numbers for Relay Word bits above row 96.
Appendix B
➤ Reordered tables to match Appendix A (alphabetic list first).
➤ Added function subheadings to Table B.2.
➤ Added new analog quantities DFDT, TUTC, TQUAL, TECORR, TE, CTRW, CTRX, PTRY, PTRZ, and 66
synchrophasor measurement quantities.
20040602
User’s Guide
Appendix A
➤ Included information on new firmware R111.
Table A.5 Instruction Manual Revision History (Sheet 12 of 16)
Revision Date Summary of Revisions
Courtesy of NationalSwitchgear.com
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