GE 750 User Manual

GE Power Management 750/760 Feeder Management Relay 17-
55
17 COMMISSIONING 17.9 CONTROL SCHEMES
17
For a
DEAD SOURCE PERMISSIVE
setpoint of DL & LB , perform the following steps:
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 dead line max volt limit. Turn both voltages off.
4. The “Out of Sync” alarm will be displayed as the bus voltage is below its minimum voltage setting limit.
5. Slowly increase the bus voltage magnitude until the “Out of Sync” alarm is no longer displayed. This should
be at the minimum live bus voltage limit. Turn both voltages off.
For a
DEAD SOURCE PERMISSIVE
setpoint of DL | DB , perform the following steps:
1. Set the bus voltage to nominal magnitude and frequency and inject into the relay. Set the line voltage to
nominal magnitude, 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 both voltages are above the dead-setting limits.
3. Slowly reduce the line voltage magnitude until the “Out of Sync” alarm is no longer displayed. This should
be at the dead line max volt limit. Increase the line voltage to nominal magnitude.
4. 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.
For a
DEAD SOURCE PERMISSIVE
setpoint of DL X DB , perform the following steps:
1. Set the bus voltage to a magnitude above the max dead-bus limit and below the min live-bus limit at nomi-
nal frequency and inject into the relay. Set the line voltage to a magnitude above the min live-line limit, 180
°
out-of-phase with the bus voltage, at the same frequency, and inject into the relay. This ensures synchro-
nism cannot be achieved. The “Out of Sync” alarm will be displayed.
2. Slowly decrease the bus voltage magnitude until the “Out of Sync” alarm is no longer displayed. This
should be just below the max dead-bus volt limit.
3. Slowly decrease the line voltage magnitude until the “Out of Sync” alarm is again displayed. This should be
just below the min live-line volt limit.
4. Decrease the line voltage magnitude to below the max dead-line limit. The “Out of Sync” alarm should
remain displayed.
5. Increase the bus voltage magnitude to above the min live-bus limit at which point the “Out of Sync” alarm is
no longer displayed.
6. Slowly increase the line voltage magnitude. At just above the max dead-line limit the “Out of Sync” alarm
should be displayed. Turn both voltages off.

GE 750 Specifications

General

Brand	GE
Model	750
Category	Relays
Language	English