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5 SETTINGS
c) PHASE TIME OVERCURRENT (ANSI 51P)
PATH: SETTINGS
GROUPED ELEMENTS
PHASE TOC1
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The phase time overcurrent element can provide a desired time-delay operating characteristic versus the applied current or
be used as a simple definite time element. The phase current input quantities may 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" (refer to the Inverse Time overcurrent
curves characteristic sub-section earlier for details on curve setup, trip times, and reset operation). When the element is
blocked, the time accumulator will reset according to the reset characteristic. For example, if the element reset characteris-
tic is set to "Instantaneous" and the element is blocked, the time accumulator will be cleared immediately.
The
setting can be dynamically reduced by a voltage restraint feature (when enabled). This is accom-
PHASE TOC1 PICKUP
plished via the multipliers (Mvr) corresponding to the phase-phase voltages of the voltage restraint characteristic curve (see
the figure below); the pickup level is calculated as 'Mvr' times the
is disabled, the pickup level always remains at the setting value.
GE Multilin
SETTING GROUP 1(6)
PHASE TOC1
FUNCTION: Disabled
PHASE TOC1 SIGNAL
SOURCE: SRC 1
PHASE TOC1
INPUT: Phasor
PHASE TOC1
PICKUP:
1.000 pu
PHASE TOC1
CURVE: IEEE Mod Inv
PHASE TOC1
TD MULTIPLIER:
PHASE TOC1
RESET: Instantaneous
PHASE TOC1 VOLTAGE
RESTRAINT: Disabled
PHASE TOC1 BLOCK A:
Off
PHASE TOC1 BLOCK B:
Off
PHASE TOC1 BLOCK C:
Off
PHASE TOC1
TARGET: Self-reset
PHASE TOC1
EVENTS: Disabled
C70 Capacitor Bank Protection and Control System
5.6 GROUPED ELEMENTS
PHASE CURRENT
PHASE TOC1(6)
Range: Disabled, Enabled
Range: SRC 1, SRC 2
Range: Phasor, RMS
Range: 0.000 to 30.000 pu in steps of 0.001
Range: See Overcurrent Curve Types table
Range: 0.00 to 600.00 in steps of 0.01
1.00
Range: Instantaneous, Timed
Range: Disabled, Enabled
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
setting. If the voltage restraint feature
PHASE TOC1 PICKUP
5
5-121
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