Schweitzer Engineering SEL-387-0, Instruction Manual

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5.21
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Metering and Monitoring
Through-Fault Event Monitor
Figure 5.8 Cumulative I
2
t Alarm (Relay Word bit ISQTAL)
Through-Fault Event
(TFE) Serial Port
Command
The TFE command displays the following discussed data for each
individually recorded through-fault event:
➤
Date and time of the through fault
➤
Duration (seconds) of the through fault
➤
Maximum current (Amps primary) for each monitored current
input
The following cumulative values (updated for each new through-fault event)
are also displayed:
➤
Through-fault count
➤
Simple I
2
t calculation for each monitored current input
Relay response to the TFE command is:
=> TFE <Enter>
XFMR 1 Date: 02/12/04 Time: 18:59:49.130
STATION A
FID=SEL-387E-X300-V0-Z102102-D20040211
Number of Through Faults: 2 Last Reset: 02/10/04 19:56:22
Winding 1 Total I-squared-t (kA^2 seconds, primary):
A-phase B-phase C-phase
1.783 88.270 6.610
# Date Time Duration IA IB IC
(seconds) (A, primary max)
1 02/14/04 18:59:22.244 5.002 241 4158 260
2 02/11/04 11:37:55.495 30.834 220 241 451
In the above response, only two through-fault events have been recorded since
the monitor was last reset (most recent event listed first, labeled #1). Notice
also that Winding 1 is the winding whose current inputs are being monitored.
The TFE command just by itself (no parameters, as in the above example) can
list as many as 20 through-fault events. To list all the stored through-fault
events since the monitor was last reset, execute the
TFE A command. To list a
particular number of through-fault events, execute the TFE n command ( n = 1
to 1200; 1200 is the maximum number of through-fault events that can be
stored before overwriting begins).
ISQTAL
Relay
Word
Bit
Cumulative
Through-Fault
I
2
t Values for:
Setting
A-phase
B-phase
C-phase
ISQT