GE B30 Instruction Manual page 325

5 SETTINGS
c) CT TROUBLE ZONE (ANSI 50/74)

PATH: SETTINGS CONTROL ELEMENTS
 CT TROUBLE ZONE 1

MESSAGE
MESSAGE
MESSAGE
MESSAGE
This element uses the differential current calculated in accordance with the bus configuration programmed under Bus Zone
1. Operation of this element is therefore completely dependent on the dynamic bus replica, which must be defined first. The
bus differential zones are defined using the path
CT problems in any of the circuits actually connected to the differential zone defined as Bus Zone 1.
The
CT TROUBLE ZONE 1 PICKUP
ferential current in a given phase remains above this level for the time interval defined by the
setting, CT Trouble is declared for the given phase by setting the appropriate FlexLogic output operand.
GE Multilin

MONITORING ELEMENTS
CT TROUBLE ZONE 1
FUNCTION: Disabled
CT TROUBLE ZONE 1
PICKUP: 0.100 pu
CT TROUBLE ZONE 1
DELAY: 10.0 s
CT TROUBLE ZONE 1
TARGET: Self-reset
CT TROUBLE ZONE 1
EVENTS: Disabled

SETTINGS
setting specifies the differential current level that defines an abnormal bus state. If the dif-
Figure 5–80: CT TROUBLE SCHEME LOGIC
B30 Bus Differential System
5.7 CONTROL ELEMENTS

CT TROUBLE ZONE 1(2)
Range: Disabled, Enabled
Range: 0.020 to 2.000 pu in steps of 0.001
Range: 1.0 to 60.0 s in steps of 0.1
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
 . The CT Trouble element 1 detects
SYSTEM SETUP BUS
CT TROUBLE ZONE 1 DELAY
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