GE G60 Instruction Manual page 563

CHAPTER 6: ACTUAL VALUES
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
 DEMAND
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
6.4.3.9 Frequency metering
ACTUAL VALUES  METERING  SOURCE SRC 1  FREQUENCY
 FREQUENCY
 SRC 1
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
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  POWER SYSTEM
frequency measurement is passed through a validation filter that eliminates false readings due to signal distortions and
transients.
6.4.3.10 Current harmonics and THD metering
ACTUAL VALUES  METERING  SOURCE SRC 1  CURRENT HARMONICS
 CURRENT HARMONICS
 SRC 1
This menu displays metered current harmonics values. The "SRC 1" text is replaced by the name was programmed for the
associated source (see
SETTINGS  SYSTEM SETUP  SIGNAL SOURCES
for the total harmonic distortion (THD) and 2nd to 25th harmonics per phase.
6.4.3.11 Voltage harmonics and THD metering
ACTUAL VALUES  METERING  SOURCE SRC 1  VOLTAGE HARMONICS
 VOLTAGE HARMONICS
 SRC 1
This menu displays metered voltage harmonics values. The "SRC 1" text is replaced by the programmed name for the
associated source (see the
SETTINGS  SYSTEM SETUP  SIGNAL SOURCES
To extract the 2nd to 25th voltage harmonics, each harmonic is computed on a per-phase basis, where:
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CLEAR RECORDS  CLEAR DEMAND RECORDS
SRC 1 FREQUENCY:

0.00 Hz
SETTINGS  SYSTEM SETUP  SIGNAL SOURCES
settings). The signal used for frequency estimation is low-pass filtered. The final
SRC 1 THD Ia: 0.0

Ib: 0.0 Ic: 0.0%
SRC 1 2ND Ia: 0.0

Ib: 0.0 Ic: 0.0%
SRC 1 3RD Ia: 0.0

Ib: 0.0 Ic: 0.0%

SRC 1 25TH Ia: 0.0

Ib: 0.0 Ic: 0.0%
SRC 1 THD Va: 0.0

Vb: 0.0 Vc: 0.0%
SRC 1 2ND Va: 0.0

Vb: 0.0 Vc: 0.0%
SRC 1 3RD Va: 0.0

Vb: 0.0 Vc: 0.0%

SRC 1 25TH Va: 0.0

Vb: 0.0 Vc: 0.0%
SETTINGS  PRODUCT SETUP
).
). Current harmonics are measured for each source
menu).
METERING
command.
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