GE 845 Instruction Manual page 277

CHAPTER 4: SETPOINTS
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845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
INSTANTANEOUS DIFF FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
INST DIFF PICKUP
Range: 3.00 to 30.00 x CT in steps of 0.01 x CT
Default: 10.00 x CT
This setting defines the pickup level of the differential current required for operation.
INST DIFF BLOCK
Range: Any FlexLogic operand
Default: Off
INST DIFF OUTPUT RELAYS
Range: Do Not Operate, Operate
Default: Do Not Operate
The menu includes a list of available output relays to be set for operation or no
operation upon protection operation.
The output relays selected under the Breaker menu for breaker trip need to be reselected if
the Percent Differential function is set to "Trip". These output relays will not be operational
even if selected to operate if the Percent Differential function is set to "Configurable".
EVENTS
Range: Disabled, Enabled
Default: Disabled
TARGETS
Range: Disabled, Self-Reset, Latched
Default: Latched
Figure 4-50: Percent and Instantaneous Differential Protection Logic Diagram
PROTECTION
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