GE L90 Instruction Manual page 493

6 ACTUAL VALUES
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The metered values for current and power demand are displayed in this menu. The "SRC 1" text will be replaced by what-
ever name was programmed by the user for the associated source (see
).
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
 menu. For each quantity, the relay displays the demand over the most recent demand time interval, the maxi-
DEMAND
mum demand since the last maximum demand reset, and the time and date stamp of this maximum demand value. Maxi-
mum demand quantities can be reset to zero with the
i) FREQUENCY METERING

PATH: ACTUAL VALUES METERING
 FREQUENCY
 SRC 1
The metered frequency values are displayed in this menu. The "SRC 1" text will be replaced by whatever name was pro-
grammed by the user for the associated source (see
is measured via software-implemented zero-crossing detection of an AC signal. The signal is either a
SOURCE FREQUENCY
Clarke transformation of three-phase voltages or currents, auxiliary voltage, or ground current as per source configuration
(see the 
SYSTEM SETUP
final frequency measurement is passed through a validation filter that eliminates false readings due to signal distortions and
transients.
If the 87L function is enabled, then dedicated 87L frequency tracking is engaged. In this case, the relay uses the
 
TRACKING FREQUENCY
GE Multilin
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
CLEAR RECORDS
 
SOURCE SRC 1
SRC 1 FREQUENCY:
0.00 Hz
SETTINGS
settings). The signal used for frequency estimation is low-pass filtered. The
POWER SYSTEM
value for all computations, overriding the
TRACKING FREQUENCY
L90 Line Current Differential System
SETTINGS

CLEAR DEMAND RECORDS
FREQUENCY
 
SYSTEM SETUP SIGNAL SOURCES
6.3 METERING
 
SYSTEM SETUP SIGNAL

SETTINGS PRODUCT SETUP
command.
).
METERING
value.
SOURCE FREQUENCY
6-19
6