GE F35 Instruction Manual page 288

GROUPED ELEMENTS
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 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 is cleared immediately.
The
PHASE TOC1 PICKUP
accomplished 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
restraint feature is disabled, the pickup level always remains at the setting value.
5
5-162
PHASE TOC1

TARGET: Self-reset
PHASE TOC1

EVENTS: Disabled
setting can be dynamically reduced by a voltage restraint feature (when enabled). This is
Figure 5-75: Phase time overcurrent voltage restraint characteristic
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.1 0.2 0.3
Phase-Phase Voltage ÷ VT Nominal Phase-phase Voltage
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
PHASE TOC1 PICKUP
0.4 0.5 0.6 0.7 0.8 0.9
818784A4.CDR
F35 MULTIPLE FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
setting. If the voltage
1.0