CHAPTER 5: SETTINGS FLEXLOGICB30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-1875Figure 5-96: FlexElement input mode settingFLEXELEMENT 1 PICKUP — This setting specifies the operating threshold for the effective operating signal of the element. Ifset to “Over,” the element picks up when the operating signal exceeds the FLEXELEMENT 1 PICKUP value. If set to “Under,” theelement picks up when the operating signal falls below the FLEXELEMENT 1 PICKUP value.FLEXELEMENT 1 HYSTERESIS — This setting controls the element dropout. Notice that both the operating signal and thepickup threshold can be negative, facilitating applications such as reverse power alarm protection. The FlexElement can beprogrammed to work with all analog actual values measured by the relay. The FLEXELEMENT 1 PICKUP setting is entered inper-unit values using the following definitions of the base units.Table 5-23: FlexElement base unitsUnit DescriptionBREAKER ACC ARCING AMPS(Brk X Acc Arc Amp A, B, and C)BASE = 2000 kA 2 × cycleBREAKER ARCING AMPS(Brk X Arc Amp A, B, and C)BASE = 1 kA 2 × cycleBUS DIFFERENTIAL RESTRAININGCURRENT(Bus Diff Mag)IBASE = maximum primary RMS value of the +IN and –IN inputs(CT primary for source currents, and bus reference primary current for bus differential currents)
