GE 750 Instruction Manual page 299

Control Schemes
GE Multilin
3. As there are no input voltages, any selected output relays should now be
operated along with the Out Of Sync control message.
4. Change the function setting to Alarm. The alarm message and LED should be
displayed, and any selected output relays should remain operated.
5. Inject a balanced three-phase voltage at nominal voltage and frequency into
the bus voltage input.
6. Turn off the voltage and make parallel connections (observing polarity) from the
bus voltage input that corresponds with the selection made under subheading
S2 SYSTEM SETUP LINE VT SENSING
Turn the voltage on and check that these voltages show difference
measurements of 0 under
not be 0 unless the bus and line VTs have identical ratings. If the difference is
not shown as 0, calculate the two equivalent primary voltage values for the
injected voltage; they should be the same.) This checks that the relay has
selected the correct bus voltage input for the synchrocheck measurements.
Turn the voltage off and remove the parallel connections.
7. Inject a single-phase voltage at nominal voltage and frequency into the bus
voltage input that corresponds with the selection made under subheading
SYSTEM SETUP LINE VT SENSING
8. Inject voltage and frequency into the line voltage input and adjust this voltage
until V, F and F as shown under subheading
Δ Δ Δ
are all 0. Reduce the line voltage magnitude to 0.
SYNCHRO DELTA
9. The "Out of Sync" alarm will be displayed as the line voltage is below the
minimum voltage requirement. Slowly raise this voltage until the "Out of Sync"
alarm is no longer displayed. This magnitude should be the setpoint value.
10. Raise the line voltage input to the nominal value, and lower the bus voltage
magnitude to 0. The "Out of Sync" alarm will be displayed as the bus voltage is
below the minimum voltage requirement. Slowly raise this voltage until the "Out
of Sync" alarm is no longer displayed. This magnitude should be the setpoint
value.
11. Enter the required setting of
will be displayed as the voltage difference is above the maximum difference
requirement.
12. While monitoring V on the display, slowly raise the bus voltage until the "Out of
Δ
Sync" alarm is no longer displayed. Check that the voltage difference is the
selected value.
13. Set the bus voltage magnitude to nominal, and the line voltage to a level above
the minimum required voltage.
14. The "Out of Sync" alarm will be displayed as the voltage difference is above the
maximum difference requirement.
15. While monitoring V on the display, slowly raise the line voltage until the "Out of
Δ
Sync" alarm is no longer displayed. Check that the voltage difference is the
selected value.
16. Set both line and bus voltage magnitude and frequency to nominal. Adjust the
line voltage phase position to lag the bus voltage by 180°.
17. The "Out of Sync" alarm will be displayed as the angle difference is above the
maximum difference requirement.
18. While monitoring F on the display, slowly increase the line voltage lagging
Δ
phase position until the "Out of Sync" alarm is no longer displayed. Check that
the angle difference is the selected value. Return the line voltage angle to 0°.
19. Set the line voltage frequency to a value lower than allowed by the maximum
frequency difference.
20. While monitoring F on the display, slowly increase the line voltage frequency
Δ
until the "Out of Sync" alarm is no longer displayed. Check that the frequency
difference is the selected value.
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Feeder Management Relay
VT CONNECTION
A2 METERING VOLTAGE SYNCHRO DELTA
.
VT CONNECTION
A2 METERING
. The "Out of Sync" alarm
MAX VOLTAGE DIFFERENCE
750/760
to the line voltage input.
(the V will
Δ
S2
VOLTAGE
7–45