CHAPTER 5: SETTINGS GROUPED ELEMENTSB30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-2095The positive-sequence restraint must be considered when testing for pickup accuracy and response time (multiple ofpickup). The operating quantity depends on how test currents are injected into the relay (single-phase injection):Eq. 5-14NEUTRAL IOC1 FUNCTION — This setting enables and disables the neutral instantaneous overcurrent protection element.NEUTRAL IOC1 SIGNAL SOURCE — This setting selects the signal source for the neutral instantaneous overcurrent protectionelement.NEUTRAL IOC1 PICKUP — This setting specifies the neutral instantaneous overcurrent pickup level in per-unit values.NEUTRAL IOC1 PICKUP DELAY — This setting delays the assertion of the NEUTRAL IOC OP operands. It is used to achieve timingcoordination with other elements and relays.NEUTRAL IOC1 RESET DELAY — This setting specifies a delay for the reset of the neutral instantaneous overcurrent elementbetween the operate output state and the return to logic 0 after the input passes outside the defined pickup range. Thissetting is used to ensure that the relay output contacts are closed long enough to ensure reception by downstreamequipment.aNEUTRAL IOC1 BLOCK — Assertion of the operand assigned to this setting blocks operation of the neutral instantaneousovercurrent element.NEUTRAL IOC1 EVENTS — This setting enables and disables the logging of neutral instantaneous overcurrent events in thesequence of events recorder.Figure 5-106: Neutral IOC1 logic5.7.6 Ground current5.7.6.1 MenuSETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) GROUND CURRENT GROUND CURRENT GROUND TOC1See below GROUND TOC6 GROUND IOC1See page 5-211 GROUND IOC6
