GE 845 Instruction Manual page 387

CHAPTER 4: SETPOINTS
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Path:
Setpoints > Monitoring > Functions > Demand > Current Demand
FUNCTION
Range: Disabled, Alarm, Latched Alarm, Configurable
Default: Disabled
MEASUREMENT TYPE
Range: Blk Interval, Exponential, Rolling Dmd
Default: Blk Interval
This setting sets the measurement method. Three methods can be applied.
THERMAL 90% RESPONSE TIME
Range: 5 min, 10 min, 15 min, 20 min, 30 min
Default: 15 min
This setpoint sets the time required for a steady state current to indicate 90% of the
actual value and allows the user to approximately match the response of the relay to
analog instruments. The setpoint is visible only if MEASUREMENT TYPE is "Thermal
Exponential".
TIME INTERVAL
Range: 5 min, 10 min, 15 min, 20 min, 30 min
Default: 20 min
This setpoint sets the time period over which the current demand calculation is to be
performed. The setpoint is visible only if MEASUREMENT TYPE is "Block Interval" or
"Rolling Demand".
PICKUP
Range: 10 to 10000 A in steps of 1 A
Default: 1000 A
This setpoint sets the Current Demand Pickup level.
BLOCK
Range: Off, Any operand from the list of FlexLogic operands
Default: Off
OUTPUT RELAY X
Range: Do Not Operate, Operate
Default: Do Not Operate
EVENTS
Range: Enabled, Disabled
Default: Enabled
MONITORING
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