GE N60 Instruction Manual page 214

5.4 SYSTEM SETUP
Class M filtering functionality is derived from the draft IEEE C37.118 specification and may be subject to
change when the standard is published.
NOTE
c) CALIBRATION

PATH: SETTINGS SYSTEM SETUP
 PMU 1
 CALIBRATION
5
This menu contains user angle calibration data for the phasor measurement unit (PMU). This data is combined with the fac-
tory adjustments to shift the phasors for better accuracy.
• PMU 1 VA... IG CALIBRATION ANGLE: These settings recognize applications with protection class voltage and cur-
rent sources, and allow the user to calibrate each channel (four voltages and four currents) individually to offset errors
introduced by VTs, CTs, and cabling. The setting values are effectively added to the measured angles. Therefore, enter
a positive correction of the secondary signal lags the true signal; and negative value if the secondary signal leads the
true signal.
• PMU 1 SEQ VOLT SHIFT ANGLE: This setting allows correcting positive- and negative-sequence voltages for vector
groups of power transformers located between the PMU voltage point, and the reference node. This angle is effectively
added to the positive-sequence voltage angle, and subtracted from the negative-sequence voltage angle. Note that:
1. When this setting is not "0°", the phase and sequence voltages will not agree. Unlike sequence voltages, the
phase voltages cannot be corrected in a general case, and therefore are reported as measured.
2. When receiving synchrophasor data at multiple locations, with possibly different reference nodes, it can be more
beneficial to allow the central locations to perform the compensation of sequence voltages.
3. This setting applies to PMU data only. The N60 calculates symmetrical voltages independently for protection and
control purposes without applying this correction.
4. When connected to line-to-line voltages, the PMU calculates symmetrical voltages with the reference to the AG
voltage, and not to the physically connected AB voltage (see the Metering Conventions section in Chapter 6).
• PMU 1 SEQ CURR SHIFT ANGLE: This setting allows correcting positive and negative-sequence currents for vector
groups of power transformers located between the PMU current point and the reference node. The setting has the
same meaning for currents as the
5-84
 
PHASOR...
PMU 1 VA CALIBRATION
ANGLE: 0.00°
PMU 1 VB CALIBRATION
MESSAGE
ANGLE: 0.00°
PMU 1 VC CALIBRATION
MESSAGE
ANGLE: 0.00°
PMU 1 VX CALIBRATION
MESSAGE
ANGLE: 0.00°
PMU 1 IA CALIBRATION
MESSAGE
ANGLE: 0.00°
PMU 1 IB CALIBRATION
MESSAGE
ANGLE: 0.00°
PMU 1 IC CALIBRATION
MESSAGE
ANGLE: 0.00°
PMU 1 IG CALIBRATION
MESSAGE
ANGLE: 0.00°
PMU 1 SEQ VOLT SHIFT
MESSAGE
ANGLE: 0°
PMU 1 SEQ CURR SHIFT
MESSAGE
ANGLE: 0°
PMU 1 SEQ VOLT SHIFT ANGLE
N60 Network Stability and Synchrophasor Measurement System
PHASOR MEASUREMENT UNIT 1(4)
Range: –5.00 to 5.00° in steps of 0.05
Range: –5.00 to 5.00° in steps of 0.05
Range: –5.00 to 5.00° in steps of 0.05
Range: –5.00 to 5.00° in steps of 0.05
Range: –5.00 to 5.00° in steps of 0.05
Range: –5.00 to 5.00° in steps of 0.05
Range: –5.00 to 5.00° in steps of 0.05
Range: –5.00 to 5.00° in steps of 0.05
Range: –180 to 180° in steps of 30
Range: –180 to 180° in steps of 30
setting has for voltages. Normally, the two correcting
5 SETTINGS

PMU 1 CALIBRATION
GE Multilin