Schweitzer Engineering Laboratories SEL-351A - Page 430

10.20
SEL-351A Relay Instruction Manual Date Code 20080213
Serial Port Communications and Commands
Command Explanations
where k is an optional parameter to specify the number of times (1–32767) to
repeat the meter display. If k is not specified, the meter report is displayed
once. The output from an SEL-351A with wye-connected voltage inputs is
shown:
=>MET <Enter>
FEEDER 1 Date: 08/10/99 Time: 15:00:52.615
STATION A
A B C N G
I MAG (A) 195.146 192.614 198.090 0.302 4.880
I ANG (DEG) -8.03 -128.02 111.89 52.98 81.22
A B C S
V MAG (KV) 11.691 11.686 11.669 11.695
V ANG (DEG) 0.00 -119.79 120.15 0.05
A B C 3P
MW 2.259 2.228 2.288 6.774
MVAR 0.319 0.322 0.332 0.973
PF 0.990 0.990 0.990 0.990
LAG LAG LAG LAG
I1 3I2 3I0 V1 V2 3V0
MAG 195.283 4.630 4.880 11.682 0.007 0.056
ANG (DEG) -8.06 -103.93 81.22 0.12 -80.25 -65.83
FREQ (Hz) 60.00 VDC (V) 129.5
=>
MET X k—Extended Instantaneous Metering
The MET X k command displays the same data as the MET k command with
the addition of calculated phase-to-phase voltage quantities Vab, Vbc, and
Vca.
NOTE: See Small Signal Cutoff for
Metering on page 8.31 for metering
behavior with small signals.
Currents I
A,B,C,N
Input currents (A primary)
I
G
Residual-ground current
(A primary; I
G
=3I
0
= I
A
+ I
B
+ I
C
)
Voltages V
A,B,C,S
Phase-to-neutral voltage inputs
(kV primary) (wye-connected)
a
V
AB,BC,CA,S
Phase-to-phase voltages
(kV primary) (delta-connected)
a
V
AB,BC,CA
Calculated phase-to-phase voltages
(kV primary) (wye-connected)
Vbase Not used in the SEL-351A.
Always displays 0.000.
Power MW
A,B,C
Single-phase megawatts
(wye-connected voltage inputs only)
MW
3P
Three-phase megawatts
MVAR
A,B,C
Single-phase megavars
(wye-connected voltage inputs only)
MVAR
3P
Three-phase megavars
Power Factor PF
A,B,C
Single-phase power factor;
leading or lagging
(wye-connected voltage inputs only)
PF
3P
Three-phase power factor;
leading or lagging
Sequence I
1
, 3I
2
, 3I
0
Positive-, negative-, and zero-sequence
currents (A primary)
V
1
, V
2
Positive- and negative-sequence voltages
(kV primary)
3V
0
Zero-sequence voltage (kV primary,
wye-connected voltage inputs only)
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