5.18
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Metering and Monitoring
Through-Fault Event Monitor
The date entries in the examples for the THE H and THE D commands are
dependent on the Date Format setting DATE_F. If setting DATE_F = MDY,
enter the dates as in the above examples (Month/Day/Year). If setting
DATE_F = YMD, enter the dates Year/Month/Day.
If the requested THE hourly or daily profile records do not exist, the relay
responds: Invalid Record. If there are no data in the hourly or daily profile
buffers, the relay responds:
No Data Available.
Thermal Monitor
Reset Functions
(THE R, THE C, and
THE P Commands)
The THE C (Clear Thermal Archives Function) command clears the daily
profile archives, hourly profile archives, and the thermal event archives.
The THE R (Reset Thermal Function) command clears all the thermal
archives (daily profile data, hourly profile data, and thermal event data) and
resets the total accumulated loss-of-life value to its preset value (if it exists) or
zero.
Using the THE P n (Load Preset Value of Total Loss of Life) command, the
user can preset the initial loss-of-life values for each phase of the monitored
transformer. The command must be followed by a value between zero and 100
percent. This command initializes the total loss-of-life value to the preset
value entered by the user, clears all the thermal archive data, and restarts the
thermal element.
Through-Fault Event Monitor
Figure 5.6 shows a distribution feeder fault beyond the protection zone of the
SEL-387-5 and SEL-387-6 Relays. Nevertheless, the fault current passes
through the transformer bank, subjecting the windings to mechanical stress
and the winding insulation to thermal stress. The more feeders on a
distribution bus, the more the transformer bank is exposed to these through
faults.
THE D (or H) 2/17/00 3/07/00 Enter THE D (or H) followed by two dates (2/17/00
chronologically precedes 3/07/00 in this example) to
display all the records (if they exist) between (and
including) those dates. The records display with the
latest record (3/07/00) at the beginning (top) of the
report and the oldest record (2/17/00) at the end
(bottom) of the report.
THE D 3/07/00 2/17/00 Enter THE D (or H) followed by two dates (3/07/00
chronologically follows date 2/17/00 in this example)
to display all records (if they exist) between (and
including) those dates. The records display with the
latest record (3/07/00) at the beginning (top) of the
report and the oldest record (2/17/00) at the end
(bottom) of the report.
Table 5.2 Using the THE Command to Access Data Reports (Sheet 2 of 2)
Example THE Serial Port
Commands
Format
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