6-18 L90 Line Current Differential System GE Multilin6.3 METERING 6 ACTUAL VALUES6The 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 SETTINGS ÖØ SYSTEM SETUP ÖØ SIGNALSOURCES).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 statisticalmetering purposes. Demand calculations are based on the measurement type selected in the SETTINGS Ö PRODUCT SETUPÖØ DEMAND menu. For each quantity, the relay displays the demand over the most recent demand time interval, the maxi-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 CLEAR RECORDS ÖØ CLEAR DEMAND RECORDS command.i) FREQUENCY METERINGPATH: ACTUAL VALUES ÖØ METERING Ö SOURCE SRC 1 ÖØ FREQUENCYThe 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 SETTINGS ÖØ SYSTEM SETUP ÖØ SIGNAL SOURCES).SOURCE FREQUENCY is measured via software-implemented zero-crossing detection of an AC signal. The signal is either aClarke transformation of three-phase voltages or currents, auxiliary voltage, or ground current as per source configuration(see the SYSTEM SETUP ÖØ POWER SYSTEM settings). The signal used for frequency estimation is low-pass filtered. Thefinal frequency measurement is passed through a validation filter that eliminates false readings due to signal distortions andtransients.If the 87L function is enabled, then dedicated 87L frequency tracking is engaged. In this case, the relay uses the METERINGÖØ TRACKING FREQUENCY Ö TRACKING FREQUENCY value for all computations, overriding the SOURCE FREQUENCY value.MESSAGE SRC 1 DMD IC MAX:0.000 AMESSAGE SRC 1 DMD IC DATE:2001/07/31 16:30:07MESSAGE SRC 1 DMD W:0.000 WMESSAGE SRC 1 DMD W MAX:0.000 WMESSAGE SRC 1 DMD W DATE:2001/07/31 16:30:07MESSAGE SRC 1 DMD VAR:0.000 varMESSAGE SRC 1 DMD VAR MAX:0.000 varMESSAGE SRC 1 DMD VAR DATE:2001/07/31 16:30:07MESSAGE SRC 1 DMD VA:0.000 VAMESSAGE SRC 1 DMD VA MAX:0.000 VAMESSAGE SRC 1 DMD VA DATE:2001/07/31 16:30:07 FREQUENCY SRC 1SRC 1 FREQUENCY:0.00 Hz
