Schweitzer Engineering Laboratories SEL-351A - Page 429

10.19
Date Code 20080213 Instruction Manual SEL-351A Relay
Serial Port Communications and Commands
Command Explanations
➤ Instantaneous
➤ Demand
➤ Energy
➤ Maximum/Minimum
➤ Synchrophasor
MET k—Instantaneous Metering
The MET k command displays instantaneous magnitudes (and angles if
applicable) of the following quantities:
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 k <Enter>
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
Wye-connected voltage inputs
(kV primary)
a
a
VS is not available in the SEL-351A-1.
V
AB,BC,CA,S
Delta-connected voltage inputs
(kV primary)
a
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)
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
b
VDC is not available in the SEL-351A-1.
Courtesy of NationalSwitchgear.com