GE L30, Инструкция по эксплуатации

Страница: 389 / 702

CHAPTER 5: SETTINGS SYSTEM SETUP
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-175
5
This menu contains user angle and magnitude calibration data for the Phasor Measurement Unit (PMU). This data is
combined with the factory adjustments to shift the phasors for better accuracy.
PMU 1 VA... IG CALIBRATION ANGLE
— These settings recognize applications with protection class voltage and current
sources, and they 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 when the secondary signal lags the true signal and a negative value when the secondary signal leads
the true signal.
PMU 1 VA... IG CALIBRATION MAGNITUDE
— These settings recognize applications with protection class voltage and current
sources, and they allow the user to calibrate each channel (four voltages and four currents) individually to offset errors
introduced by VTs, CTs. The setting values are effectively a multiplier of the measured magnitudes. Therefore, entering a
multiplier greater than 100% of the secondary signal increases the true signal, and a multiplier less than 100% value of the
secondary signal reduces 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:
•
When this setting 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 L30 calculates symmetrical 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 (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
PMU 1 SEQ VOLT SHIFT 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.
5.5.8.11 PMU triggering overview
SETTINGS

SYSTEM SETUP

PHASOR MEASUREMENT UNIT

PHASOR MEASUREMENT UNIT 1

PMU 1
TRIGGERING

PMU 1 SEQ VOLT SHIFT
ANGLE: 0°
Range: –180 to 180° in steps of 30

PMU 1 SEQ CURR SHIFT
ANGLE: 0°
Range: –180 to 180° in steps of 30
 PMU 1

TRIGGERING

 PMU 1 USER

TRIGGER
See below


PMU 1 FREQUENCY
 TRIGGER
See page 5-176


PMU 1 VOLTAGE
 TRIGGER
See page 5-177

 PMU 1 CURRENT

TRIGGER
See page 5-178

 PMU 1 POWER

TRIGGER
See page 5-179


PMU 1 df/dt
 TRIGGER
See page 5-180