Schweitzer Engineering Laboratories SEL-321 - Meter; Open

Date Code 20011026 Communications 3-15
SEL-321/321-1 Instruction Manual
=>>LOOP R <ENTER>
LOOP R <ENTER>LOOP R <ENTER>
LOOP R <ENTER>
Loopback is disabled.
=>>
METER
A METER report displays the phase-to-neutral and phase-to-phase voltages and currents in
primary kilovolts and amperes. It also displays real and reactive power in megawatts and
megavars. An example is shown below.
Use the METER command with a number to repeatedly display the meter data that many times.
To display a series of eight meter readings, type METER 8 <ENTER>.
=>METER <ENTER>
METER <ENTER>METER <ENTER>
METER <ENTER>
EXAMPLE: BUS B, BREAKER 3 Date: 02/01/93 Time: 15:15:24.640
A B C AB BC CA
I (A) 202 198 197 349 339 344
V (kV) 134.0 133.8 133.6 231.5 230.9 231.9
P (MW) 78.61
Q (MVAR) 13.85
=>
The METER command may also be executed from the front panel (see Meter Display under LCD
Functions and Front-Panel Commands).
OPEN
The 3PT element asserts in response to the OPEN command. If 3PT or TPA, TPB and TPC are
assigned to outputs with the SET L command, the command will trip the breaker. The 3PT
condition remains closed for a minimum duration (TDURD setting) starting with the rising edge
of the TRIP output. The 3PT condition drops out only if the trip unlatch conditions are met or if
you push the TARGET RESET button on the front panel.
If the TDURD setting is zero, the OPEN command is disabled.
To open the circuit breaker by command, type OPEN <ENTER>. The prompt "Open
BREAKER (Y/N) ?" is transmitted. Answering Y <ENTER> yields a second prompt: "Are you
sure (Y/N) ?" Answering Y <ENTER> again closes the TRIP output relay as described above.
If the port is designated AUTO, a summary event report is displayed.
If the Breaker Jumper (P7: J106) is not in place, the relay responds: "Aborted: Breaker Jumper
Not in Place."