A.3
Date Code 20100129 Instruction Manual SEL-751A Relay
Firmware and Manual Versions
Firmware
Table A.3 200 Series Firmware Revision History
Firmware Identification (FID) Number Summary of Revisions Manual Date Code
SEL-751A-R204-V0-Z003002-D20081124 ➤ Corrected firmware upgrade issue in firmware revision
R203 when upgrading relays with previous firmware ver-
sions R200–R202.
20081124
SEL-751A-R203-V0-Z003002-D20081104
➤ Corrected 55 element operation (an issue in firmware R201
only).
➤ Corrected VDC (VBAT) metering (an issue in firmware
R202 only).
20081104
SEL-751A-R202-V0-Z003002-D20081022
SEL-751A-R105-V0-Z002001-D20081022
➤ Updated IEC 61850 firmware to enhance security, stream-
line MMS processing, and improve TCP/IP connections.
➤ Improved security (see www.selinc.com/privacy.htm for
details).
20081022
SEL-751A-R201-V0-Z003002-D20080808
➤ Improved active Ethernet port selection logic during relay
startup (applies to dual redundant Ethernet port option
relays).
20080808
SEL-751A-R200-V0-Z003002-D20080627
➤ Added a four-shot automatic reclosing (79) option. 20080627
➤ Added synchronism-check voltage input (VS) and element
(25) option.
➤ Added synchronism voltage input (VS) based over- and
undervoltage elements (27S, 59S).
➤ Added new Ethernet port options.
➢ single fiber-optic Ethernet.
➢ dual fiber-optic or copper Ethernet ports with
FAILOVER or SWITCH modes.
➤ Added capability to support two Modbus TCP sessions.
➤ Added station dc battery monitor function.
➤ Added single-phase power, reactive power, apparent power,
and power factor metering when wye-connected PTs are
used.
➤ Improved VNOM setting resolution from (xxx) to two dec-
imal places (xxx.xx).
➤ Changed setting range for 27P1P and 27P2P settings from
(OFF, 0.60–1.00 x Vnm) to (OFF, 0.02–1.00 x Vnm).
➤ Extended 50 elements range as follows:
➢ 1 A nom (OFF, 0.10–20.00 A) from
(OFF, 0.10–19.20 A).
➢ 5 A nom (OFF, 0.50–100.00 A) from
(OFF, 0.50–96.00 A).
➤ Corrected MIRRORED BITS communication using
MBT-9600 modem.
Table A.4 100 Series Firmware Revision History (Sheet 1 of 2)
Firmware Identification (FID) Number Summary of Revisions Manual Date Code
SEL-751A-R104-V0-Z002001-D20080508 ➤ Revised I
N
scaling for the I
NOM
= 2.5 mA, high sense neu-
tral CT input, for proper operation of the 50N elements.
20080508
SEL-751A-R103-V0-Z002001-D20080325
➤ Corrected reporting of digital inputs (INXXX) during relay
power up to MMS for IEC 61850 protocol.
20080325
➤ Corrected setting change function using Modbus Function
Code 06 when voltage board is not installed.
➤ Corrected SER captures of digital input transitions.
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