Bus Differential - GE B90 Instruction Manual

CHAPTER 5: SETTINGS
Each of the six setting group menus is identical. Setting group 1 (the default active group) is active automatically when no
other group is active.
If the device incorrectly switches to group 1 after power cycling, upgrade the firmware to version 7.31 or later to correct
this issue.

5.6.3 Bus differential

SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  BUS DIFFERENTIAL  BUS ZONE 1(6) DIFFERENTIAL
 BUS ZONE 1
 DIFFERENTIAL
Up to six zones of bus differential protection are provided, depending on the software options. The operation of these
elements is completely dependent on the dynamic bus replica, which must be defined first. Both restrained (biased) and
unrestrained (unbiased, instantaneous) bus differential protection functions are provided for each bus differential zone.
The biased bus differential function has a dual-slope operating characteristic (see figure below) operating in conjunction
with saturation detection and a directional comparison principle (see the logic diagram in this section).
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
 BREAKER FAILURE


 VOLTAGE ELEMENTS


 CURRENT ELEMENTS


 END FAULT PROTECTION


BUS ZONE 1 DIF

FUNCTION: Disabled
BUS ZONE 1 DIF

PICKUP: 0.100 pu
BUS ZONE 1 DIF

LOW SLOPE: 25%
BUS ZONE 1 DIF

LOW BPNT: 2.00 pu
BUS ZONE 1 DIF

HIGH SLOPE: 60%
BUS ZONE 1 DIF

HIGH BPNT: 8.00 pu
BUS ZONE 1 DIF

HIGH SET: 15.00 pu
BUS ZONE 1 DIF

SEAL-IN: 0.400 s
BUS ZONE 1 DIF SUPV:

On
BUS ZONE 1 DIF TRIP:

Off
BUS ZONE 1 DIF BLK:

Off
BUS ZONE 1 DIF

TARGET: Latched
BUS ZONE 1 DIF

EVENTS: Disabled
GROUPED ELEMENTS
See page 5-160
See page 5-168
See page 5-169
See page 5-176
Range: Disabled, Enabled
Range: 0.050 to 6.000 pu in steps of 0.001
Range: 15 to 100% in steps of 1
Range: 1.00 to 30.00 pu in steps of 0.01
Range: 50 to 100% in steps of 1
Range: 1.00 to 30.00 pu in steps of 0.01
Range: 0.10 to 99.99 pu in steps of 0.01
Range: 0.000 to 65.535 s in steps of 0.001
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
5
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