5-176 C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUALSYSTEM SETUP CHAPTER 5: SETTINGS5This menu contains user angle and magnitude calibration data for the Phasor Measurement Unit (PMU). This data iscombined 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 currentsources, and they allow the user to calibrate each channel (four voltages and four currents) individually to offset errorsintroduced by VTs, CTs, and cabling. The setting values are effectively added to the measured angles. Therefore, enter apositive correction when the secondary signal lags the true signal and a negative value when the secondary signal leadsthe true signal.PMU 1 VA... IG CALIBRATION MAGNITUDE — These settings recognize applications with protection class voltage and currentsources, and they allow the user to calibrate each channel (four voltages and four currents) individually to offset errorsintroduced by VTs, CTs. The setting values are effectively a multiplier of the measured magnitudes. Therefore, entering amultiplier greater than 100% of the secondary signal increases the true signal, and a multiplier less than 100% value of thesecondary signal reduces the true signal.PMU 1 SEQ VOLT SHIFT ANGLE — This setting allows correcting positive- and negative-sequence voltages for vector groups ofpower transformers located between the PMU voltage point and the reference node. This angle is effectively added to thepositive-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 phasevoltages 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 morebeneficial to allow the central locations to perform the compensation of sequence voltages.• This setting applies to PMU data only. The C60 calculates symmetrical voltages independently for protection andcontrol purposes without applying this correction.• When connected to line-to-line voltages, the PMU calculates symmetrical voltages with the reference to the AGvoltage 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 ofpower transformers located between the PMU current point and the reference node. The setting has the same meaning forcurrents 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 powertransformer.5.5.7.11 PMU triggering overviewSETTINGS SYSTEM SETUP PHASOR MEASUREMENT UNIT PHASOR MEASUREMENT UNIT 1(2) PMU 1(2)TRIGGERING PMU 1 SEQ VOLT SHIFTANGLE: 0°Range: –180 to 180° in steps of 30 PMU 1 SEQ CURR SHIFTANGLE: 0°Range: –180 to 180° in steps of 30 PMU 1 TRIGGERING PMU 1 USER TRIGGERSee page 5-177 PMU 1 FREQUENCY TRIGGERSee page 5-177 PMU 1 VOLTAGE TRIGGERSee page 5-178 PMU 1 CURRENT TRIGGERSee page 5-179 PMU 1 POWER TRIGGERSee page 5-180 PMU 1 df/dt TRIGGERSee page 5-181
