GE 850 - Page 511

CHAPTER 8: CONTROL SYNCHROCHECK (25)
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 8–39
DEAD BUS VOLTS MAX
Range: 0.00 to 1.50 x VT in steps of 0.01 x VT
Default: 0.20 x VT
The setpoint establishes a maximum voltage magnitude for the Bus Voltage. Below this
magnitude, the Bus Voltage input used for Synchrocheck is considered “Dead” or de-
energized.
FAST PATH:
The Dead Bus voltage setting should not be higher than the Live Bus voltage setting.
DEAD LINE VOLTS MAX
Range: 0.00 to 1.50 x VT in steps of 0.01 x VT
Default: 0.20 x VT
This setpoint establishes a maximum voltage magnitude for the Line Voltage. Below this
magnitude, the Line Voltage input used for Synchrocheck is be considered “Dead” or de-
energized.
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
The Synchrocheck is blocked when the selected operand is asserted. Typically 52a (the
circuit breaker closed) contact is used to block Synchrocheck (Synchrocheck is needed
only when the circuit breaker is open). Synchrocheck can be also blocked when the relay
is tripping.
OUTPUT RELAY X
For details see Common Setpoints
.
EVENTS
Range: Enabled, Disabled
Default: Enabled
TARGETS
Range: Disabled, Self-reset, Latched
Default: Self-reset