A.10
SEL-551 Relay Instruction Manual Date Code 20110408
Firmware and Manual Versions
Instruction Manual
Information about changes to earlier versions of the SEL-551 Instruction Manual is not available.
Section 4, Settings Sheets
➤ Added settings DMTC, PDEMP, NDEMP, GDEMP, QDEMP to Sheet 3 of 9.
➤ Added Relay Word bits PDEM, NDEM, GDEM, QDEM (see Table 4.3 and Table 5.5).
Section 5
➤ Added serial port and front-panel commands to access demand meter data [see MET D Command (Demand
Meter)].
➤ Modified Recloser Logic. Relay goes to the Lockout State for Open Command execution [see OPE Command
(Open)].
Appendix C
➤ Added fast meter messages A5C2, A5D2, A5C3, A5D3 for demand meter data.
➤ Increased the number of digital banks in the A5C1 message.
➤ Added demand meter Relay Word bits to the Compressed ASCII DNA command.
Table A.2 Instruction Manual Revision History (Sheet 8 of 8)
Revision Date Summary of Revisions
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