
5.9
Date Code 20170814
Instruction Manual
SEL-700G Relay
Metering and Monitoring
Metering
Math Variable
Metering
The SEL-700G includes 32 math variables. When you receive your
SEL-700G, no math variables are enabled. To use math variables, enable the
number of math variables (between 1 and 32) you require, using the EMV
setting in the Logic setting category. Figure 5.9 shows the device response to
the METER MV M(ath) V(ariable) command with 8 of the 32 math variables
enabled.
RMS Metering
The SEL-700G includes root-mean-squared (rms) metering. Use rms metering
to measure the entire signal (including harmonics). You can measure the rms
quantities shown in Table 5.5.
RMS quantities contain the total signal energy including harmonics. This
differs from the fundamental meter (METER command) in that the
fundamental meter quantities only contain the fundamental frequency (60 Hz
for a 60 Hz system). Figure 5.10 shows the METER RMS command.
=>>
MET MV <Enter>
SEL-700G Date: 02/24/2010 Time: 15:26:40.866
GENERATOR RELAY Time Source: Internal
MV01 1.00
MV02 -32767.00
MV03 -1.00
MV04 0.00
MV05 1000.59
MV06 -1000.61
MV07 2411.01
MV08 2410.99
=>>
Figure 5.9
Device Response to the METER MV Command
Table 5.5
RMS Meter Values
Relay Option
RMS Meter Values
X-Side RMS Quantities
(model dependent)
➤
Input currents IAX, IBX, and ICX magnitudes
(A primary)
➤
Wye-connected input voltages (with respect to neutral):
VAX, VBX, and VCX magnitudes (V primary)
➤
Delta-connected input voltages: VABX, VBCX, and
VCAX magnitudes (V primary)
Y-Side RMS Quantities
(model dependent)
➤
Input currents IAY, IBY, and ICY magnitudes (A pri-
mary)
➤
Wye-connected input voltages (with respect to neutral):
VAY, VBY, and VCY magnitudes (V primary)
➤
Delta-connected input voltages: VABY, VBCY, and
VCAY magnitudes (V primary)
Other RMS Quantities
(model dependent)
➤
Synchronism-check voltage input (VS) magnitude (V pri-
mary)
➤
Neutral current input (IN) magnitude (A primary)
Содержание SEL-700G Series
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