Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

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10.20
SEL-351-5, -6, -7 Relay Instruction Manual
Date Code 20070117
Serial Port Communications and Commands
Command Explanations
➤
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 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>
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 with wye-connected voltage inputs is shown:
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)
V
AB,BC,CA,S
Delta-connected voltage inputs
(kV 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
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)