Synchrocheck - GE Feeder Management Relay 750 Instruction Manual

5 SETPOINTS
PATH: SETPOINTS S7 CONTROL

SYNCHROCHECK

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If a breaker can be a paralleling point between two generation sources, it is common practice to automatically perform a
check to ensure the sources are within allowable voltage limits before permitting closing of the breaker. Synchrocheck pro-
vides this feature by checking that the bus and line input voltages are within the programmed differentials of voltage magni-
tude, phase angle position, and frequency. If this feature is enabled, the check will be performed before either manual close
or automatic reclose signals can operate the Close Output Relay. The synchrocheck programming can allow for permitted
closing if either or both of the sources are de-energized. The measured line input voltage magnitude and frequency are
also made available as actual values under
voltage at the relay terminals is at least 10.0 V. The differential values of angle, magnitude, and frequency are also made
available for display.
With a Delta connected Bus VT, Phase to Neutral voltages cannot be determined. Thus Synchrocheck can-
not be used with a Delta connected Bus VT and a Wye connected Line VT.
WARNING
The
DEAD SOURCE PERMISSIVE
permit a breaker closure. The voltage levels that determine whether a source is dead or live are configurable in the four set-
points following this one. The
"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
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.
GE Multilin
Courtesy of NationalSwitchgear.com
SYNCHROCHECK
ð
ENTER SYNCHROCHECK
ESCAPE
FUNCTION: Disabled
SYNCHROCHECK
ESCAPE
MESSAGE RELAYS (3-7): -----
DEAD SOURCE
ESCAPE
MESSAGE PERMISSIVE: Off
DEAD BUS MAX
ESCAPE
MESSAGE VOLTAGE: 0.20 x VT
DEAD LINE MAX
ESCAPE
MESSAGE VOLTAGE: 0.20 x VT
LIVE BUS MIN
ESCAPE
MESSAGE VOLTAGE: 0.80 x VT
LIVE LINE MIN
ESCAPE
MESSAGE VOLTAGE: 0.80 x VT
MAX VOLTAGE
ESCAPE
MESSAGE DIFFERENCE: 2.00 kV
MAX ANGLE
ESCAPE
MESSAGE DIFFERENCE: 24°
MAX FREQ
ESCAPE
MESSAGE DIFFERENCE: 2.00 Hz
A2 METERING
setpoint selects the combination of dead and live sources that bypass synchrocheck and
range is as follows:
DEAD SOURCE PERMISSIVE
and
DEAD LINE MAX VOLTAGE
750/760 Feeder Management Relay
Range: Disabled, Alarm, Latched Alarm, Control
Range: Any combination of 3 to 7 Auxiliary relays
Range: Off, DB&DL, LL&DB, DL&LB, DL|DB, DLxDB
Range: 0.00 to 1.25 x VT in steps of 0.01
Range: 0.00 to 1.25 x VT in steps of 0.01
Range: 0.00 to 1.25 x VT in steps of 0.01
Range: 0.00 to 1.25 x VT in steps of 0.01
Range: 0.01 to 100.00 kV in steps of 0.01
Range: 0 to 100° in steps of 1
Range: 0.00 to 5.00 Hz in steps of 0.01
. The frequency is only displayed if the
SYNCHRO VOLTAGE
setpoints, enter the voltage magnitude as a fraction of the bus
5.8 S7 CONTROL
5.8.2 SYNCHROCHECK
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