GE 750 Instruction Manual page 300

750/760
Feeder Management Relay
7–46
21. Set the line voltage to a frequency higher than permitted by the maximum
frequency difference.
22. The "Out of Sync" alarm will be displayed as the frequency difference is above
the maximum difference requirement. While monitoring
slowly decrease the line voltage frequency until the "Out of Sync" alarm is no
longer displayed. Check that the frequency difference is the selected value. Turn
voltages off.
If the Dead Source Permissive feature is to be used, set the
,
DIFFERENCE MAX ANGLE DIFFERENCE
minimum values; and the
DEAD SOURCE PERMISSIVE
,
MAX VOLTAGE LIVE BUS MIN VOLTAGE
required settings.
For a
DEAD SOURCE PERMISSIVE
1. Set the bus voltage to a magnitude above the dead-bus level, and nominal fre-
quency and inject into the relay.
2. Set the line voltage to a magnitude above the dead-line level, 180° out-of-
phase with the bus voltage, at the same frequency, and inject into the relay.
This ensures synchronism cannot be achieved. The "Out of Sync" alarm will be
displayed as both the bus and line voltages are above their dead-setting limits.
3. Turn the bus voltage off. The "Out of Sync" alarm will be displayed as line
voltage is above the dead limit.
4. Slowly reduce the line voltage, until the "Out of Sync" alarm is no longer
displayed. This should be at the dead line max volt limit. Return the voltages to
the level prior to the reduction.
5. The "Out of Sync" alarm will be displayed as both the bus and line voltages are
above their dead-setting limits.
6. Turn the line voltage off. The "Out of Sync" alarm will be displayed.
7. Slowly reduce the bus voltage, until the "Out of Sync" alarm is no longer
displayed. This should be at the dead bus max volt limit. Turn the voltages off.
For a
DEAD SOURCE PERMISSIVE
1. Set the line voltage to nominal magnitude and frequency and inject into the
relay. Set the bus voltage to a magnitude above the dead-bus level, 180° out-
of-phase with the line voltage, at the same frequency, and inject into the relay.
This ensures synchronism cannot be achieved.
2. The "Out of Sync" alarm will be displayed as the bus voltage is above its dead-
setting limit.
3. Slowly reduce the bus voltage magnitude until the "Out of Sync" alarm is no
longer displayed. This should be at the dead bus max volt limit. Turn both
voltages off. The "Out of Sync" alarm will be displayed as the line voltage is
below its minimum voltage setting limit.
4. Slowly increase the line voltage magnitude until the "Out of Sync" alarm is no
longer be displayed. This should be at the minimum live line voltage limit. Turn
both voltages off.
For a
DEAD SOURCE PERMISSIVE
1. Set the bus voltage to nominal magnitude and frequency and inject into the
relay. Set the line voltage to a magnitude above the dead-line level, 180° out-
of-phase with the bus voltage, at the same frequency, and inject into the relay.
This ensures synchronism cannot be achieved.
2. The "Out of Sync" alarm will be displayed as the line voltage is above its dead-
setting limit.
3. Slowly reduce the line voltage magnitude until the "Out of Sync" alarm is no
longer displayed. This should be at the
voltages off.
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, and
MAX FREQ DIFFERENCE
,
DEAD BUS MAX VOLTAGE
, and
LIVE LINE MIN VOLTAGE
setpoint of "DB & DL", perform the following steps:
setpoint of "LL & DB", perform the following steps:
setpoint of "DL & LB", perform the following steps:
DEAD LINE MAX VOLTAGE
Control Schemes
F on the display,
Δ
MAX VOLTAGE
setpoints to the
,
DEAD LINE
setpoints to the
limit. Turn both
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