GE Multilin 850

CHAPTER 4: SETPOINTS PROTECTION
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–203
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
The element will be blocked, when the selected operand is asserted.
RESTORE FUNCTIONX
Range: Disabled, Close, Configurable
Default: Disabled
This setting enables the generator CB restoration function.
Output relay #2 “Close” only operates when the Close function is selected.
MIN VOLTAGE
Range: 0.05 to 1.50 x VT in steps of 0.01
Default: 0.95 x VT
Reclosing of the generator circuit breaker requires that the voltage measurement at the
network connection point must exceed the Minimum Voltage level.
MIN FREQUENCY
Range: 20.00 to 65.00 Hz in steps of 0.01
Default: 59.00 Hz
MAX FREQUENCY
Range: 20.00 to 65.00 Hz in steps of 0.01
Default: 60.50 Hz
Re-closing of the generator circuit breaker requires that the frequency measurement
must lie within the band defined by the Min Frequency and Max Frequency setpoints.
MIN CURRENT
Range: 0.00 to 1.00 x CT in steps of 0.01
Default: 0.50 x CT
Current that is greater than the minimum current level, as defined by the Min Current
setpoint, resets the CB restore command initiated by this element.
RESTORE INITIATE
Range: Off, any FlexLogic Operand
Default: Off
This parameter specifies any input (e.g. trip) which initiates the restoration function for
decoupling. When the assigned input drops to zero, it will start the Restore Delay timer
and release the command to re-close the generating unit CB. If the assigned input
becomes active, the Restore Delay timer resets and the restoring release deactivates.
If more than one input is required to initiate the restoration function, then the FlexLogic
builder must be used to build the required logic.
27Q INITIATE
Range: Off, On
Default: Off
When set to ‘ON’ this setting allows the initiation of the generating unit CB re-closing
from the UV Reactive Power protection function by using the operand ‘UV Var OP’.