GE C60 Instruction Manual page 387

CHAPTER 5: SETTINGS
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).
Current triggering
SETTINGS  SYSTEM SETUP  PHASOR MEASUREMENT UNIT  PHASOR MEASUREMENT UNIT 1(2)  PMU 1(2)
TRIGGERING  PMU 1(2) CURRENT TRIGGER
 PMU 1 CURRENT
 TRIGGER
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
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
Figure 5-94: Voltage trigger logic
PMU 1 CURR TRIGGER

FUNCTION: Disabled
PMU 1 CURR TRIGGER

PICKUP: 1.800 pu
PMU 1 CURR TRIGGER

PKP TIME: 0.10 s
PMU 1 CURR TRIGGER

DPO TIME: 1.00 s
PMU 1 CURR TRIG BLK:

Off
PMU 1 CURR TRIGGER

TARGET: Self-reset
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Enabled, Disabled
Range: Enabled, Disabled
Range: 0.100 to 30.000 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
SYSTEM SETUP
5
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