Phasor Measurement Unit Communications - GE D90 Plus Instruction Manual

PHASOR MEASUREMENT UNIT

Phasor Measurement Unit communications

536
Ia Angle, Ib Angle, Ic Angle, Ig Angle
Range: –5.00 to 5.00° in steps of 0.05
Default: 0.00°
These settings recognize applications with protection class voltage and current sources,
and allow the user to calibrate each channel (ground current and phase A, B, and C
currents) individually to offset errors introduced by VTs, CTs, and cabling. The setting
values are effectively added to the measured angles. Enter a positive correction if the
secondary signal lags the true signal. Enter a negative value if the secondary signal
leads the true signal.
Sequence Voltage Shift Angle
Range: –180 to 180° in steps of 30
Default: 0°
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 the following:
– When this setting value is not "0°", the phase and sequence voltages do not
agree. Unlike sequence voltages, the phase voltages cannot be corrected in a
general case, and therefore are reported as measured.
– 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.
– This setting applies to PMU data only. The D90
voltages independently for protection and control purposes without applying this
correction.
– 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.
Sequence Current Shift Angle
Range: –180 to 180° in steps of 30
Default: 0°
This setting allows correction of 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
Angle setting has for voltages. Normally, the two correcting angles are set identically,
except rare applications when the voltage and current measuring points are located at
different windings of a power transformer.
Select the Settings > Metering > Phasor Measurement Unit > Communication > Comm
Port menu to open the Phasor Measurement Unit communications window for port 1.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 11: METERING
Plus
calculates symmetrical
Sequence Voltage Shift