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F35 MULTIPLE FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
The phase time overcurrent element can provide a specified time-delay operating characteristic versus the applied current
or be used as a simple definite time element. The phase current input quantities can be programmed as fundamental
phasor magnitude or total waveform RMS magnitude as required by the application.
Two methods of resetting operation are available: “Timed” and “Instantaneous” (see the Inverse TOC Curve Characteristics
section earlier for details on curve setup, trip times, and reset operation). When the element is blocked, the time
accumulator resets according to the reset characteristic. For example, if the element reset characteristic is set to
“Instantaneous” and the element is blocked, the time accumulator clears immediately.
The
PHASE TOC1 PICKUP
setting can be reduced dynamically by a voltage restraint feature (when enabled). This is
accomplished via the multipliers (Mvr) corresponding to the phase-phase voltages of the voltage restraint characteristic
curve (see the figure); the pickup level is calculated as Mvr times the
PHASE TOC1 PICKUP
setting. If the voltage restraint
feature is disabled, the pickup level always remains at the setting value.
PHASE TOC1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
PHASE TOC1
INPUT: Phasor
Range: Phasor, RMS
PHASE TOC1
PICKUP: 1.000 pu
Range: 0.020 to 30.000 pu in steps of 0.001
PHASE TOC1
CURVE: IEEE Mod Inv
Range: see Overcurrent Curve Types table
PHASE TOC1
TD MULTIPLIER: 1.00
Range: 0.00 to 600.00 in steps of 0.01
PHASE TOC1
RESET: Instantaneous
Range: Instantaneous, Timed
PHASE TOC1 VOLTAGE
RESTRAINT: Disabled
Range: Disabled, Enabled
PHASE TOC1 BLOCK A:
Off
Range: FlexLogic operand
PHASE TOC1 BLOCK B:
Off
Range: FlexLogic operand
PHASE TOC1 BLOCK C:
Off
Range: FlexLogic operand
PHASE TOC1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
PHASE TOC1
EVENTS: Disabled
Range: Disabled, Enabled