6-20
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
METERING
CHAPTER 6: ACTUAL VALUES
6
This menu displays metered values for current and power demand. The "SRC 1" text is replaced by the name programmed
by the user for the associated source (see
SETTINGS
SYSTEM SETUP
SIGNAL SOURCES
).
The relay measures (absolute values only) the source demand on each phase and average three phase demand for real,
reactive, and apparent power. These parameters can be monitored to reduce supplier demand penalties or for statistical
metering purposes. Demand calculations are based on the measurement type selected in the
SETTINGS
PRODUCT SETUP
DEMAND
menu. For each quantity, the relay displays the demand over the most recent demand time interval, the
maximum demand since the last maximum demand reset, and the time and date stamp of this maximum demand value.
Maximum demand quantities can be reset to zero with the
CLEAR RECORDS
CLEAR DEMAND RECORDS
command.
6.4.2.9 Frequency metering
ACTUAL VALUES
METERING
SOURCE SRC 1
FREQUENCY
The metered frequency values are displayed in this menu. The "SRC 1" text is replaced by the name programmed by the
user for the associated source (see
SETTINGS
SYSTEM SETUP
SIGNAL SOURCES
).
SOURCE FREQUENCY
is measured via software-implemented zero-crossing detection of an AC signal. The signal is either a
Clarke transformation of three-phase voltages or currents, auxiliary voltage, or ground current as per source configuration
(see the
SYSTEM SETUP
POWER SYSTEM
settings). The signal used for frequency estimation is low-pass filtered. The final
frequency measurement is passed through a validation filter that eliminates false readings due to signal distortions and
transients.
SRC 1 DMD IB MAX:
0.000 A
SRC 1 DMD IB DATE:
2001/07/31 16:30:07
SRC 1 DMD IC:
0.000 A
SRC 1 DMD IC MAX:
0.000 A
SRC 1 DMD IC DATE:
2001/07/31 16:30:07
SRC 1 DMD W:
0.000 W
SRC 1 DMD W MAX:
0.000 W
SRC 1 DMD W DATE:
2001/07/31 16:30:07
SRC 1 DMD VAR:
0.000 var
SRC 1 DMD VAR MAX:
0.000 var
SRC 1 DMD VAR DATE:
2001/07/31 16:30:07
SRC 1 DMD VA:
0.000 VA
SRC 1 DMD VA MAX:
0.000 VA
SRC 1 DMD VA DATE:
2001/07/31 16:30:07
FREQUENCY
SRC 1
SRC 1 FREQUENCY:
0.00 Hz