GE B90 Instruction Manual page 235

5 SETTINGS
SETTING
B90 FUNCTION:
Logic = 0
Protection = 1
SETTING
CT TROUBLE ZONE 1
FUNCTION:
Disabled = 0
Enabled = 1
SETTING
BUS 1A CT:
Current Phasor
SETTINGS
BUS 1A STATUS:
Off = 0
BUS 1A DIRECTION:
. . .
SETTING
BUS 1X CT:
Current Phasor
SETTINGS
BUS 1X STATUS:
Off = 0
BUS 1X DIRECTION:
c) ISOLATOR MONITORING

PATH: SETTINGS CONTROL ELEMENTS
 ISOLATOR 1

MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
Bus protection zone discrimination depends heavily on reliable isolator position feedback. Therefore, two isolator auxiliary
contacts – normally open and normally closed – must confirm the status of the isolator via the B90 contact inputs.
GE Multilin
AND
SETTINGS
CT TROUBLE ZONE 1
PICKUP:
RUN
Id1 > PICKUP
Figure 5–55: CT TROUBLE SCHEME LOGIC

MONITORING ELEMENTS
ISOLATOR 1
FUNCTION: Disabled
ISOLATOR 1 OPEN:
Off
ISOLATOR 1 CLOSED:
Off
ISOLATOR 1 ALARM
DELAY: 0.05 s
ISOLATOR 1 RESET:
Off
ISOLATOR 1
TARGET: Self-Reset
ISOLATOR 1
EVENTS: Disabled
B90 Low Impedance Bus Differential System
5.6 CONTROL ELEMENTS
SETTINGS
CT TROUBLE ZONE 1
PICKUP:
FLEXLOGIC OPERAND
t
CT TROUBLE1 OP
PKP
0
836759A3.CDR
 
BUS REPLICA ISOLATOR 1(48)
Range: Disabled, Enabled
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: 0.00 to 120.00 s in steps of 0.05
Range: FlexLogic™ operand
Range: Self-Reset, Latched, Disabled
Range: Disabled, Enabled
5
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