Sel 421 - Table 4.11 Communications Port Commands that Clear Relay Buffers

U.4.80
SEL-421 Relay User’s Guide Date Code 20090715
Basic Relay Operations
Readying the Relay for Field Application
Step 15. Set the relay (see Making Simple Settings Changes on
page U.4.13, Section 1: Protection Application Examples in the
Applications Handbook, and Section 1: Protection Functions in
the Reference Manual).
Step 16. Connect the relay for tripping/closing duty (see AC/DC
Connection Diagrams on page U.2.50).
Step 17. From Access Level 2, use a communications terminal to issue
the commands to clear the relay data buffers (listed in
Table 4.11).
Step 18. Connect the secondary voltage and current inputs (see User’s
Guide Section 2: Installation).
Step 19. Use the MET command or the
ACSELERATOR QuickSet HMI
to view relay metering to confirm secondary connections (see
Examining Metering Quantities on page U.4.33).
Table 4.11 Communications Port Commands That Clear Relay Buffers
Communications Port Command Tas k Pe r fo r m ed
MET RD Reset demand meter data
MET RP Reset peak demand meter data
MET RE Reset energy meter data
MET RM Reset maximum/minimum meter data
HIS CA Reset event report and history buffers
SER CA Reset Sequential Events Recorder data
Courtesy of NationalSwitchgear.com