CHAPTER 5: SETTINGS GROUPED ELEMENTS
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL 5-195
5
Recloser curves
The C70 uses the FlexCurve feature to facilitate programming of 41 recloser curves. See the FlexCurves settings section
earlier in this chapter for details.
5.7.3.3 Phase time overcurrent (ANSI 51P, IEC PTOC)
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) PHASE CURRENT PHASE TOC1(6)
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.
The Phase TOC element can be used as a basic thermal overload protection element, using I
2
t curves. The thermal time
characteristic with I
2
t is based on the current squared, integrated over time during fault. The PHASE TOC 1 I2t RST operand is
asserted indicating that protected apparatus is cooled down and can be safely put back into service.
PHASE TOC 1
PHASE TOC1
FUNCTION: Disabled
Range: Disabled, Enabled
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
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