GE 750, Инструкция по эксплуатации, Страница: 262 / 504

14-
6
750/760 Feeder Management Relay GE Power Management
14.2 SYNCHROCHECK 14 S7 CONTROL
14
14.2 SYNCHROCHECK 14.2.1 DESCRIPTION
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 pro-
grammed 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 2 CLOSE out-
put 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
A2 METERING \ SYNCHRO VOLTAGE
. The frequency is only displayed if the voltage at the relay termi-
nals is at least 10.0 volts. 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 Synch-
rocheck cannot be used with a Delta connected Bus VT and a Wye connected Line VT.
14.2.2 SETPOINTS
■
SYNCHROCHECK
■
[ENTER] for more
The Synchrocheck setpoints path is:
\ SETPOINTS \ S7 CONTROL \ SYCHROCHECK
SYNCHROCHECK
FUNCTION: Disabled
Range: Disabled, Alarm, Latched Alarm, Control
Select the required function.
SYNCHROCHECK
RELAYS (3-7):
Range: Any Combination of the 3-7 AUXILIARY Relays
Select the output relays required.
DEAD SOURCE
PERMISSIVE: Off
Range: Off, DB&DL, LL&DB, DL&LB, DL|DB, DLXDB
Selects the combination of dead and live 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 next four setpoints.
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).
DEAD BUS MAXIMUM
VOLTAGE: 0.20 x VT
Range: 0.00 to 1.25 in steps of 0.01 x VT
Enter the voltage magnitude as a fraction of the bus VT input nominal voltage.
Below this setting the single bus voltage input used for synchrocheck will be
considered ‘Dead’, or de-energized.
DEAD LINE MAXIMUM
VOLTAGE: 0.20 x VT
Range: 0.00 to 1.25 in steps of 0.01 x VT
Enter the voltage magnitude as a fraction of the line VT input nominal voltage.
Below this setting the line voltage input used for synchrocheck is established
as ‘Dead’, or de-energized.
WARNING