Synchrocheck - GE 750 Instruction Manual

750/760
Feeder Management Relay

Synchrocheck

SYNCHROCHECK
WARNING
5–100
PATH: SETPOINTS S7 CONTROL
[ ] SYNCHROCHECK
FUNCTION: Disabled
SYNCHROCHECK
MESSAGE
RELAYS (3-7): -----
DEAD SOURCE
MESSAGE
PERMISSIVE: Off
DEAD BUS MAX
MESSAGE
VOLTAGE: 0.20 x VT
DEAD LINE MAX
MESSAGE
VOLTAGE: 0.20 x VT
LIVE BUS MIN
MESSAGE
VOLTAGE: 0.80 x VT
LIVE LINE MIN
MESSAGE
VOLTAGE: 0.80 x VT
MAX VOLTAGE
MESSAGE
DIFFERENCE: 2.00 kV
MAX ANGLE
MESSAGE
DIFFERENCE: 24°
MAX FREQ
MESSAGE
DIFFERENCE: 2.00 Hz
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 provides this
feature by checking that the bus and line input voltages are within the programmed
differentials of voltage magnitude, 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
only displayed if the 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 cannot be used with a Delta connected Bus
VT and a Wye connected Line VT.
The
DEAD SOURCE PERMISSIVE
sources that bypass synchrocheck and permit a breaker closure. The voltage levels
that determine whether a source is dead or live are configurable in the four
setpoints 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
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.
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SYNCHROCHECK
Range: Disabled,
Range: Any combination of 3 to 7
Range: Off, DB&DL, LL&DB, DL&LB,
Range: 0.00 to 1.25 x VT in steps of
Range: 0.00 to 1.25 x VT in steps of
Range: 0.00 to 1.25 x VT in steps of
Range: 0.00 to 1.25 x VT in steps of
Range: 0.01 to 100.00 kV in steps of
Range: 0 to 100° in steps of 1
Range: 0.00 to 5.00 Hz in steps of 0.01
A2 METERING SYNCHRO VOLTAGE
setpoint selects the combination of dead and live
range is as follows:
DEAD SOURCE PERMISSIVE
and
DEAD LINE MAX VOLTAGE
S7 Control
Alarm, Latched
Alarm, Control
Auxiliary relays
DL|DB, DLxDB
0.01
0.01
0.01
0.01
0.01
. The frequency is
setpoints, enter the
GE Multilin