GE Multilin g60 Instruction Manual page 258
Ur series generator protection system
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5.4 SYSTEM SETUP
•
PMU 1 VA... IG CALIBRATION MAGNITUDE: These settings recognize applications with protection class voltage and
current sources, and 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,
enter a multiplier greater then 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:
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 date at multiple locations, with possibly different reference nodes, it may be more
beneficial to allow the central locations to perform the compensation of sequence voltages.
3.
This setting applies to PMU data only. The G60 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
angles are set identically, except rare applications when the voltage and current measuring points are located at differ-
ent windings of a power transformer.
e) PMU TRIGGERING OVERVIEW
5
PATH: SETTINGS
SYSTEM SETUP
PMU 1
TRIGGERING
Each logical phasor measurement unit (PMU) contains five triggering mechanisms to facilitate triggering of the associated
PMU recorder, or cross-triggering of other PMUs of the system. They are:
•
Overfrequency and underfrequency.
•
Overvoltage and undervoltage.
•
Overcurrent.
•
Overpower.
•
High rate of change of frequency.
The pre-configured triggers could be augmented with a user-specified condition built freely using programmable logic of the
relay. The entire triggering logic is refreshed once every two power system cycles.
5-98
PMU 1 SEQ VOLT SHIFT ANGLE
PHASOR...
PMU 1 USER
TRIGGER
PMU 1 FREQUENCY
MESSAGE
TRIGGER
PMU 1 VOLTAGE
MESSAGE
TRIGGER
PMU 1 CURRENT
MESSAGE
TRIGGER
PMU 1 POWER
MESSAGE
TRIGGER
PMU 1 df/dt
MESSAGE
TRIGGER
G60 Generator Protection System
setting has for voltages. Normally, the two correcting
PHASOR MEASUREMENT UNIT 1
See page 5-99.
See page 5-99.
See page 5-100.
See page 5-101.
See page 5-102.
See page 5-104.
5 SETTINGS
PMU 1 TRIGGERING
GE Multilin
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