Megger SR-98, Инструкция по эксплуатации

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45
Pick Up and Drop Out Test:
1. Press
the
INIT
button to turn on the
AC VOLTS (M)
voltage source.
2.
Rotate Control Knob until rated voltage appears on the
AC VOLTS (M)
display.
3.
Using the arrow key, highlight the
AC VOLTS (AUX)
. Press the
AC AUX
button
to turn the AC Volts on.
4.
Rotate Control Knob and increase AUX AC Voltage output to the desired test
voltage. 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.
5.
Using the arrow key, highlight the phase angle displayed. Using the Control
Knob, rotate the phase angle to the desired test angle (normally zero degrees).
5.
Using the arrow key, highlight
AC VOLTS (AUX)
. Using the Control Knob, adjust
the AC AUX Volts until the contacts just close (for pick up). Record the pick up
value.
7.
Continue to increase voltage until contacts just open (for drop out). Record the
drop out value.
Closing Angle (Operating Angle) Test:
8.
Decrease the AC AUX Voltage back to the rated voltage (the closing contacts
should be closed).
9.
Using the arrow key, highlight the phase angle display. Using the Control Knob,
adjust the Phase Angle clockwise until the contacts just open. Note the Phase
Angle (
θ
1).
10.
Vary the Phase Angle counter-clockwise. The contacts will close again
indicating that we are in the operating characteristic. Continue moving in the
counter-clockwise direction until the contacts just open again. Note the Phase
Angle (
θ
2).
For example, if the relay has a closing characteristic angle of 20 degrees, typical
recorded phase angles should be 340 degrees (20 degrees leading) and 20 degrees
(lagging).