Tracking Frequency - GE t60 Instruction Manual

6 ACTUAL VALUES
FREQUENCY
SRC 1
CURRENT HARMONICS
SRC 1
MESSAGE
MESSAGE
MESSAGE
Four identical Source menus are available. The "SRC 1" text will be replaced by whatever name was programmed by the
user for the associated source (see
The relay measures (absolute values only)
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
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.
are measured for each Source for the THD and 2nd to 25th harmonics per phase.
CURRENT HARMONICS
PATH: ACTUAL VALUES METERING

TRACKING FREQUENCY

The tracking frequency is displayed here. The frequency is tracked based on configuration of the reference source. The
is based upon positive sequence current phasors from all line terminals and is synchronously
TRACKING FREQUENCY
adjusted at all terminals. If currents are below 0.125 pu, then the
GE Multilin
SRC 1 FREQUENCY:
0.00 Hz
SRC 1 THD Ia:
Ib: 0.0 Ic:
SRC 1 2ND Ia:
Ib: 0.0 Ic:
SRC 1 3RD Ia:
Ib: 0.0 Ic:
↓
SRC 1 25TH Ia:
Ib: 0.0 Ic:
SETTINGS SYSTEM SETUP
SOURCE DEMAND
CLEAR RECORDS
settings). The signal used for frequency estimation is low-pass filtered. The
POWER SYSTEM
TRACKING FREQUENCY
TRACKING FREQUENCY:
60.00 Hz
T60 Transformer Management Relay
0.0
0.0%
0.0
0.0%
0.0
0.0%
0.0
0.0%
).
SIGNAL SOURCES
on each phase and average three phase demand for real,
CLEAR DEMAND RECORDS
is used.
NOMINAL FREQUENCY
6.3 METERING
SETTINGS PRODUCT SETUP
command.
6.3.4 TRACKING FREQUENCY
6-15
6