Megger SR-98, Инструкция по эксплуатации

Страница: 43 / 93

37
VOLTAGE RELAY:
The
VOLTAGE RELAY
Test Screen is used to test all single-phase AC under and
overvoltage relays. From the
TEST MENU
Screen, select
VOLTAGE RELAY
. The
following test screen should be displayed.
Connect Relay Trip contacts to
STOP/MONITOR
gate.
Connect
DC AUX
output to relay (for solid state or microprocessor-based).
Connect
AC AUX
output terminals to the relay potential coil or input.
Note: If relay is solid state, or microprocessor-based, and requires a DC logic voltage
prior to applying test, connect the relay dc power terminals to the
DC AUX
terminals.
With the arrow key, highlight the
DC VOLTS
and press the
DC
Button. Increase the DC
voltage output by rotating the Control Knob until proper logic voltage is applied.
PICKUP and DROPOUT TEST PROCEDURE FOR AC VOLTAGE RELAYS
1.
AC VOLTS
should already be highlighted, if not use the arrow key to highlight
the
AC VOLTS
display.
2. Press
the
AC AUX
button to turn on the AC Voltage output.
3.
Rotate Control Knob and increase voltage until the
TRIP
LED turns
ON
(if over
voltage), or turns OUT if under voltage.
4.
Read and record the Pick-up voltage. Reduce the voltage (for over voltage
elements) until the trip contacts just open, read and record the drop out voltage.
5.
Return output to zero, press the
AC AUX
Button to turn OFF AC Voltage.