Bus Differential - GE b30 Instruction Manual

GROUPED ELEMENTS
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.

5.7.3 Bus differential

SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  BUS DIFFERENTIAL  BUS ZONE 1(2) DIFFERENTIAL
 BUS ZONE 1
 DIFFERENTIAL
5
Two zones of bus differential protection are provided. The operation of these elements is completely dependent on the
dynamic bus replica, which must be defined first. Both biased and unbiased bus differential protection functions are
provided for the 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).
5-168
 GROUND CURRENT


 BREAKER FAILURE


 VOLTAGE ELEMENTS


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 BLK:

Off
BUS ZONE 1 DIF

TARGET: Latched
BUS ZONE 1 DIF

EVENTS: Disabled
CHAPTER 5: SETTINGS
See page 5-187
See page 5-190
See page 5-199
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: Self-reset, Latched, Disabled
Range: Disabled, Enabled
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL