4.207
Date Code 20170927 Instruction Manual SEL-751 Relay
Protection and Logic Functions
Report Settings (SET R Command)
To simplify your review of the information displayed in the SER record, the
relay provides the Alias setting function. Using the Alias settings, you can
change the way relay elements listed in the previous SER settings are dis-
played in the SER report. In addition, the Alias settings allow you to change
the text displayed when a particular element is asserted and deasserted. The
relay permits as many as 20 unique aliases, as defined by the Enable Alias Set-
tings (EALIAS) setting. Factory default alias settings are shown in
Table 4.103.
Define the enabled alias settings by entering the Relay Word bit name, a
space, the alias you want, a space, the text to display when the condition
asserts, a space, and the text to display when the condition deasserts.
See Table K.1 for the complete list of Relay Word bits. Use as many as
15 characters to define the alias, asserted text, and deasserted text strings. You
can use capital letters (A–Z), numbers (0–9), and the underscore character (_)
within each string. Do not attempt to use a space within a string because the
relay interprets a space as the break between two strings. If you want to clear a
string, simply type NA.
Event Report Settings
Event reports can be either 15 cycles, 64 cycles, or 180 cycles in length as
determined by the LER setting. For LER of 15, the prefault length, PRE, must
be in the range of 1–10. The relay can hold as many as seventy-nine 15-cycle
event reports, eighteen 64-cycle event reports, or six 180-cycle event reports.
ALIAS1 = PB01 FP_AUX1 PICKUP DROPOUT
Table 4.103 SET R SER Alias Settings
Setting Prompt Relay Word Bit Alias Asserted Text
Deasserted
Tex t
ALIAS1 := PB01 FP_AUX1 PICKUP DROPOUT
ALIAS2 := PB02 FP_LOCK PICKUP DROPOUT
ALIAS3 := PB03 FP_CLOSE PICKUP DROPOUT
ALIAS4 := PB04 FP_TRIP PICKUP DROPOUT
ALIAS5 –ALIAS20 NA
Table 4.104 Event Report Settings
Setting Prompt Setting Range Setting Name := Factory Default
EVENT TRIGGER SELOGIC ER := R_TRIG 51P1P OR R_TRIG 51G1P
OR R_TRIG 50P1P OR R_TRIG 50G1P OR
R_TRIG 51N1P OR R_TRIG CF
EVENT LENGTH 15, 64, 180 cyc LER := 15
PREFAULT LENGTH 1–175 cyc
a
a
The range shown is for LER := 180. The generalized range is 1 - (LER-5) cyc.
PRE := 5
NOTE: Event report data stored in
the relay is lost when you change the
LER setting, You must save the data
before changing the setting.
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