Schweitzer Engineering Laboratories SEL-351A - Page 431

10.21
Date Code 20080213 Instruction Manual SEL-351A Relay
Serial Port Communications and Commands
Command Explanations
The angles are referenced to voltage V
A
{wye-connected} or V
AB
{delta-
connected} if the reference voltage is greater than 13 V secondary; otherwise,
the angles are referenced to A-phase current. The angles range from –179.99
to 180.00 degrees.
To view instantaneous metering values, enter the command:
=>MET X k <Enter>
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 X <Enter>
FEEDER 12 Date: 12/12/00 Time: 11:31:22.626
SUB B
A B C N G
I MAG (A) 30.302 36.558 29.254 7.454 7.526
I ANG (DEG) -2.02 -121.88 119.60 -115.20 -117.52
A B C S
V MAG (KV) 14.761 14.636 14.880 15.235
V ANG (DEG) 0.00 -119.95 120.94 29.93
AB BC CA Vbase
V MAG (KV) 25.452 25.448 25.790 0.000
V ANG (DEG) 29.89 -89.23 150.34
A B C 3P
MW 0.447 0.535 0.435 1.417
MVAR 0.016 0.018 0.010 0.044
PF 0.999 0.999 1.000 1.000
LAG LAG LAG LAG
I1 3I2 3I0 V1 V2 3V0
MAG 32.036 6.196 7.526 14.759 0.131 0.212
ANG (DEG) -1.47 106.38 -117.52 0.33 -59.08 157.40
FREQ (Hz) 60.00 VDC (V) 125.6
=>
MET D—Demand Metering
The MET D command displays the demand and peak demand values of the
following quantities:
Frequency FREQ (Hz) Instantaneous power system
frequency (measured on voltage
channel VA or from voltage V1)
Station DC VDC (V) Voltage at POWER terminals
(input into station battery monitor)
b
a
VS is not available in the SEL-351A-1.
b
VDC is not available in the SEL-351A-1.
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
)
3I
2
Negative-sequence current (A primary)
Power MW
A,B,C
Single-phase megawatts
(wye-connected voltage inputs only)
MW
3P
Three-phase megawatts
Courtesy of NationalSwitchgear.com