4.206
SEL-751 Relay Instruction Manual Date Code 20170927
Protection and Logic Functions
Report Settings (SET R Command)
To use the automatic deletion and reinsertion function, proceed with the fol-
lowing steps:
Step 1. Set Report setting ESERDEL (Enable SER Delete) to Y to
enable this function.
Step 2. Select values for the setting SRDLCNT (SER Delete Count)
and the setting SRDLTIM (SER Delete Time) that mask the
chattering SER element.
Setting SRDLTIM declares a time interval during which the relay qualifies an
input by comparing the changes of state of each input against the SRDLCNT
setting. When an item changes state more than SRDLCNT times in an
SRDLTIM interval, the relay automatically removes these Relay Word bits
from SER recording. Once deleted from recording, the item(s) are ignored for
the next nine intervals. At the ninth interval, the chatter criteria is again
checked and, if the point does not exceed the criteria, it is automatically rein-
serted into recording at the starting of the tenth interval. You can enable or dis-
able the autodeletion function via the SER settings. Any autodeletion notice
entry is lost during changes of settings. The deleted items can be viewed in the
SER Delete Report (command SER D—refer to Section 7: Communications
for additional information).
SER Trigger Lists
To capture element state changes in the SER report, enter the Relay Word bit
into one of the four SER (SER1 through SER4) trigger equations. Each of the
four programmable trigger equations allows entry of as many as 24 Relay
Word bits separated by spaces or commas; the SER report accepts a total of 96
Relay Word bits. Table 4.101 shows the settings prompt and default settings
for the four SER trigger equations.
Relay Word Bit Aliases
Table 4.100 Auto-Removal Settings
Settings Prompt Setting Range Fa ctory Default
Auto-Removal Enable Y, N ESERDEL := N
Number of Counts 2–20 counts SRDLCNT := 5
Removal Time 0.1–90.0 seconds SRDLTIM := 1.0
Ta b le 4 .1 01 S E R
a
Trigger Settings
a
Use as many as 24 Relay Word elements separated by spaces or commas for each setting.
Setting Prompt Setting Name := Factory Default
SER1 SER1 := IN101 IN102 51P1T 51G1T 50P1P 50N1T 51N1T PB01
PB02 PB03 PB04
SER2 SER2 := CLOSE 52A CC
SER3 SER3 := 81D1T 81D2T
SER4 SER4 := SALARM
Table 4.102 Enable Alias Settings
Setting Prompt Setting Range
Setting Name :=
Fac to ry Default
Enable ALIAS Settings (N, 1–20) N, 1–20 EALIAS = 4
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