GE B90 UR Series Instruction Manual page 208

5.5 GROUPED ELEMENTS

PATH: SETTINGS GROUPED ELEMENTS
 BUS ZONE 1
 DIFFERENTIAL
5
Up to four zones of bus differential protection are provided, depending on the software options. The operation of these ele-
ments is completely dependent on the dynamic bus replica, which must be defined first. Both restrained (biased) and unre-
strained (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 (refer to the Bus zone 1 differential scheme logic figure in
this section).
5-94

SETTING GROUP 1(6)
BUS ZONE 1 DIFF
FUNCTION: Disabled
BUS ZONE 1 DIFF
MESSAGE
PICKUP: 0.100 pu
BUS ZONE 1 DIFF
MESSAGE
LOW SLOPE: 25%
BUS ZONE 1 DIFF
MESSAGE
LOW BPNT: 2.00 pu
BUS ZONE 1 DIFF
MESSAGE
HIGH SLOPE: 60%
BUS ZONE 1 DIFF
MESSAGE
HIGH BPNT: 8.00 pu
BUS ZONE 1 DIFF
MESSAGE
HIGH SET: 15.00 pu
BUS ZONE 1 DIFF
MESSAGE
SEAL-IN: 0.400 s
BUS ZONE 1 DIFF SUPV:
MESSAGE
On
BUS ZONE 1 DIFF TRIP:
MESSAGE
Off
BUS ZONE 1 DIFF BLK:
MESSAGE
Off
BUS ZONE 1 DIFF
MESSAGE
TARGET: Latched
BUS ZONE 1 DIFF
MESSAGE
EVENTS: Disabled
B90 Low Impedance Bus Differential System
 
BUS DIFFERENTIAL BUS ZONE 1)(4) DIFFERENTIAL
Range: Disabled, Enabled
Range: 0.050 to 2.000 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 SETTINGS
5.5.3 BUS DIFFERENTIAL
GE Multilin