GE T60 Instruction Manual page 352
Transformer protection system
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SYSTEM SETUP
5.5.8.14 Voltage triggering
SETTINGS SYSTEM SETUP PHASOR MEASUREMENT UNIT PHASOR MEASUREMENT UNIT 1 PMU 1
TRIGGERING PMU 1 VOLTAGE TRIGGER
PMU 1 VOLTAGE
TRIGGER
5
This element responds to abnormal voltage. Separate thresholds are provided for low and high voltage. In terms of
signaling its operation, the element does not differentiate between the undervoltage and overvoltage events. The trigger
responds to the phase voltage signal of the Phasor Measurement Unit (PMU) source. All voltage channels (A, B, and C or AB,
BC, and CA) are processed independently and can trigger the recorder. A minimum voltage supervision of 0.1 pu is
implemented to prevent pickup on a de-energized circuit, similarly to the undervoltage protection element.
PMU 1 VOLT TRIGGER LOW-VOLT
source. 1 pu is a nominal voltage value defined as the nominal secondary voltage times VT ratio. The comparator applies a
1% hysteresis.
PMU 1 VOLT TRIGGER HIGH-VOLT
source. 1 pu is a nominal voltage value defined as the nominal secondary voltage times VT ratio. The comparator applies a
1% hysteresis.
PMU 1 VOLT TRIGGER PKP TIME
PMU 1 VOLT TRIGGER DPO TIME
when using the recorder in the forced mode (recording as long as the triggering condition is asserted).
5-170
Figure 5-85: Frequency trigger logic
PMU 1 VOLT TRIGGER
FUNCTION: Disabled
PMU 1 VOLT TRIGGER
LOW-VOLT: 0.800 pu
PMU 1 VOLT TRIGGER
HIGH-VOLT: 1.200 pu
PMU 1 VOLT TRIGGER
PKP TIME: 0.10 s
PMU 1 VOLT TRIGGER
DPO TIME: 1.00 s
PMU 1 VOLT TRIG BLK:
Off
PMU 1 VOLT TRIGGER
TARGET: Self-reset
PMU 1 VOLT TRIGGER
EVENTS: Disabled
— Specifies the low threshold for the abnormal voltage trigger, in per-unit of the PMU
— Specifies the high threshold for the abnormal voltage trigger, in per-unit of the PMU
— Use to filter out spurious conditions and avoid unnecessary triggering of the recorder.
— Use to extend the trigger after the situation returns to normal. This setting is of importance
Range: Enabled, Disabled
Range: 0.250 to 1.250 pu in steps of 0.001
Range: 0.750 to 1.750 pu in steps of 0.001
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Enabled, Disabled
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
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