63
Phase Sequence Test:
With the outputs still on from the High Voltage Contact Pick Up Test, reduce the test
voltages to a value that is half way between the high voltage and low voltage pick up
values. The moving contact should be “floating” between the two stationary contacts.
Using the arrow key, highlight the phase angle displayed (300 degrees). Using the
Control Knob, increase the phase angle toward 0 degrees. Note that the moving contact
closes toward the Low Voltage Contact. Continue to rotate the control knob, until 30
degrees is indicated. The Low Voltage Contacts should be closed. Return the angle
back to 300 degrees, the moving contacts should be “floating” between the High
Voltage Contacts and Low Voltage Contacts.
Loss of Phase Test:
With the outputs still on from the High Voltage Pick Up Test, switch the
AC AUX
output
off by pressing the
AC
Button. Note that the Low Voltage contacts are closed.
Pick Up Low Voltage Contacts:
If you have just completed the High Voltage Pick up Test, move the MONITOR leads
from the High Voltage Contacts to the Low Voltage contacts, and proceed to step 5.
Otherwise, connect the Low Voltage contacts, see Test Connections above, and
proceed to Step 1.
1. Press
the
INIT
button to turn on the
AC VOLTS (M)
voltage source. Rotate
Control Knob until a voltage value slightly more than the expected pickup value
appears on the
AC VOLTS (M)
display.
2.
Using the arrow key, highlight the
AC VOLTS (AUX)
. Press the
AC AUX
button
to turn the
AC AUX
Volts on.
3.
Rotate Control Knob and increase
AUX
AC Voltage output to approximately the
same test voltage as the
V (M)
output. Note the phase angle displayed,
V (M)
lags V (AUX)
.
The relay may be closed at this point depending on the measured
phase angle displayed.
4.
Using the arrow key, highlight the phase angle displayed. Using the Control
Knob, rotate the phase angle to 300 degrees.
5.
Using the arrow key, highlight
AC VOLTS (AUX)
. Using the Control Knob, adjust
the
AC AUX
Volts to the expected pickup value. Using the arrow key, highlight
the
AC VOLTS (M)
. Adjust the voltage for both the
AC VOLTS (M)
and
AC AUX
for a balanced pickup value. Record the pick up value.
Содержание SR-98
Страница 93: ...87...
