GE 750 Instruction Manual page 254

S7 CONTROL
5 - 128
"Off": Dead source permissive is disabled.
"DB&DL": Dead Bus AND Dead Line.
"LL&DB": Live Line AND Dead Bus.
"DL&LB": Dead Line AND Live Bus.
"DL|DB": Dead Line OR Dead Bus.
"DLxDB": Dead Line XOR Dead Bus (one source is Dead and one is Live).
For the
DEAD BUS MAX VOLTAGE
magnitude as a fraction of the bus or line VT input nominal voltage. If the bus or line
voltage falls below these values, the single bus/line voltage input used for synchrocheck
will be considered 'dead', or de-energized.
For the
LIVE BUS MIN VOLTAGE
magnitude as a fraction of the bus or line VT input nominal voltage. If the bus or line
voltage rises above the respective setting, the single bus or line voltage input used for
synchrocheck is established as 'live', or energized.
The voltage, angular, and frequency differences of the primary systems are also entered
through the
MAX VOLTAGE DIFFERENCE
setpoints, respectively. A voltage magnitude, angular, or frequency differential
DIFFERENCE
on the two input voltages below the values entered here is within the permissible limit for
synchronism.
FIGURE 5–60: Synchrocheck Logic
and
DEAD LINE MAX VOLTAGE
and
LIVE LINE MIN VOLTAGE
,
MAX ANGLE DIFFERENCE
750 FEEDER MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
setpoints, enter the voltage
setpoints, enter the voltage
, and
MAX FREQ