5-190 B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUALGROUPED ELEMENTS CHAPTER 5: SETTINGS5Each of the six setting group menus is identical. Setting group 1 (the default active group) is active automatically when noother group is active.If the device incorrectly switches to group 1 after power cycling, upgrade the firmware to version 7.31 or later to correctthis issue.5.7.3 Bus differentialSETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) BUS DIFFERENTIAL BUS ZONE 1(2) DIFFERENTIALTwo zones of bus differential protection are provided. The operation of these elements is completely dependent on thedynamic bus replica, which must be defined first. Both biased and unbiased bus differential protection functions areprovided for the bus differential zone.The biased bus differential function has a dual-slope operating characteristic (see figure below) operating in conjunctionwith saturation detection and a directional comparison principle (see the logic diagram in this section). GROUND CURRENTSee page 5-209 BREAKER FAILURESee page 5-212 VOLTAGE ELEMENTSSee page 5-221 BUS ZONE 1 DIFFERENTIAL BUS ZONE 1 DIFFUNCTION: DisabledRange: Disabled, Enabled BUS ZONE 1 DIFPICKUP: 0.100 puRange: 0.050 to 6.000 pu in steps of 0.001 BUS ZONE 1 DIFLOW SLOPE: 25%Range: 15 to 100% in steps of 1 BUS ZONE 1 DIFLOW BPNT: 2.00 puRange: 1.00 to 30.00 pu in steps of 0.01 BUS ZONE 1 DIFHIGH SLOPE: 60%Range: 50 to 100% in steps of 1 BUS ZONE 1 DIFHIGH BPNT: 8.00 puRange: 1.00 to 30.00 pu in steps of 0.01 BUS ZONE 1 DIFHIGH SET: 15.00 puRange: 0.10 to 99.99 pu in steps of 0.01 BUS ZONE 1 DIFSEAL-IN: 0.400 sRange: 0.000 to 65.535 s in steps of 0.001 BUS ZONE 1 DIF BLK:OffRange: FlexLogic operand BUS ZONE 1 DIFTARGET: LatchedRange: Self-reset, Latched, Disabled BUS ZONE 1 DIFEVENTS: DisabledRange: Disabled, Enabled
