7-22
Serial Port Communications and Commands
Date Code 20020129
SEL-387E Instruction Manual
MET P
Displays peak demand ammeter data, in primary amperes
MET RD n
Resets demand ammeter for Winding n (n = 1, 2, 3, A)
MET RP n
Resets peak demand ammeter values for Winding n
(n = 1, 2, 3, A)
MET SEC
Displays winding current metering data, with magnitude and
phase angle, in secondary and voltage quantities
Use the
MET XXX n
command, where n is a positive integer, to repeat the MET XXX report n
times. For example, to display a series of eight meter readings, type
MET 8 <ENTER>.
If the Analog Input Label settings (IAW1, etc.) have been renamed, these will appear in the
report as set.
MET E (Energy Metering)
Access Levels 1, B, 2
The
MET E
command initiates the energy metering function. The element runs every second,
using the average value of the last 16 cycles of the previous second to calculate energy
quantities. This function is explained more fully in
Section 5: Metering and Monitoring
, where
a sample report also is shown.
MET H (Harmonic Metering)
Access Levels 1, B, 2
The
MET H
command is different from the normal metering functions, in that it uses one full
cycle of unfiltered data, at 64 samples per cycle, to provide a snapshot of total harmonic content
of all 12 analog inputs. It uses a Fast Fourier Transform technique to provide secondary
quantities for all harmonics from 1 (fundamental) to 15.
This function is explained more fully in
Section 5: Metering and Monitoring
, where a sample
report also is shown. If the Analog Input Label settings (IAW1, etc.) have been renamed, these
will appear in the report as set.
OPE n (Open)
Access Levels B, 2
The
OPE n
command asserts the OCn Relay Word bit. This bit must be included in the TRn trip
logic setting for Breaker n in order for opening to take place. This logic is described in
Section 4: Control Logic.
To open circuit Breaker n by this command, type
OPE n<ENTER>
. The prompt “Open Breaker
n (Y/N) ?” is displayed. Then “Are you sure (Y/N) ?” is displayed. Typing
N <ENTER>
after
either of the above prompts aborts the opening operation with the message “Command Aborted.”
If both questions are answered
Y<ENTER>
, the breaker will be opened, an automatic message
summarizing the trip will be sent, an Event Report will be created, and the TRIP LED on the
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