Schweitzer Engineering Laboratories SEL-351 - MET D - Demand Metering

Date Code 20001006 Serial Port Communications and Commands 10-21
SEL-351 Instruction Manual
Frequency FREQ (Hz) Instantaneous power system frequency (measured on voltage
channel VA)
Station DC VDC (V) Voltage at POWER terminals (input into station battery monitor)
The angles are referenced to the A-phase voltage if it 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 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-351
Relay with wye-connected voltage inputs is shown:
=>MET <ENTER>MET <ENTER>
FEEDER 1 Date: 02/01/97 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 D – Demand Metering
The MET D command displays the demand and peak demand values of the following quantities:
Currents I
A,B,C,N
Input currents (A primary)
I
G
Residual ground current (A primary; IG =3I0 = IA + IB + IC)
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
MVAR
A,B,C
Single-phase megavars (wye-connected voltage inputs only)
MVAR
3P
Three-phase megavars
Reset Time Demand, Peak Last time the demands and peak demands were reset
To view demand metering values, enter the command:
=>MET D <ENTER>
Courtesy of NationalSwitchgear.com