5-170 L90 Line Current Differential System GE Multilin5.6 GROUPED ELEMENTS 5 SETTINGS5b) NEUTRAL TIME OVERCURRENT (ANSI 51N)PATH: SETTINGS ÖØ GROUPED ELEMENTS Ö SETTING GROUP 1(6) ÖØ NEUTRAL CURRENT Ö NEUTRAL TOC1(2)The neutral time overcurrent element can provide a desired time-delay operating characteristic versus the applied currentor be used as a simple definite time element. The neutral current input value is a quantity calculated as 3Io from the phasecurrents and may be programmed as fundamental phasor magnitude or total waveform RMS magnitude as required by theapplication.Two methods of resetting operation are available: “Timed” and “Instantaneous” (refer to the Inverse time overcurrent curvecharacteristics section for details on curve setup, trip times and reset operation). When the element is blocked, the timeaccumulator will reset according to the reset characteristic. For example, if the element reset characteristic is set to “Instan-taneous” and the element is blocked, the time accumulator will be cleared immediately.Figure 5–90: NEUTRAL TIME OVERCURRENT 1 SCHEME LOGIC NEUTRAL TOC1NEUTRAL TOC1FUNCTION: DisabledRange: Disabled, EnabledMESSAGE NEUTRAL TOC1 SIGNALSOURCE: SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4MESSAGE NEUTRAL TOC1INPUT: PhasorRange: Phasor, RMSMESSAGE NEUTRAL TOC1PICKUP: 1.000 puRange: 0.000 to 30.000 pu in steps of 0.001MESSAGE NEUTRAL TOC1CURVE: IEEE Mod InvRange: See OVERCURRENT CURVE TYPES tableMESSAGE NEUTRAL TOC1TD MULTIPLIER: 1.00Range: 0.00 to 600.00 in steps of 0.01MESSAGE NEUTRAL TOC1RESET: InstantaneousRange: Instantaneous, TimedMESSAGE NEUTRAL TOC1 BLOCK:OffRange: FlexLogic™ operandMESSAGE NEUTRAL TOC1TARGET: Self-resetRange: Self-reset, Latched, DisabledMESSAGE NEUTRAL TOC1EVENTS: DisabledRange: Disabled, EnabledSETTINGNEUTRAL TOC1FUNCTION:Disabled = 0Enabled = 1SETTINGNEUTRAL TOC1SOURCE:INNEUTRAL TOC1BLOCK:Off = 0NEUTRAL TOC1CURVE:NEUTRAL TOC1TD MULTIPLIER:NEUTRAL TOC 1RESET:SETTINGSSETTINGIN ≥ PICKUPItNEUTRAL TOC1PICKUP:RUN827034A3.VSDFLEXLOGIC OPERANDSNEUTRAL TOC1 DPONEUTRAL TOC1 OPNEUTRAL TOC1INPUT:ANDNEUTRAL TOC1 PKP
