Control Panel
The control panel contains the supply on/off switch, the high voltage display, voltage
ramp rate selection and the three control keys. The operation of the instrument is
very simple. When the instrument is turned on, the on/off switch is illuminated, and
the software edition code will be flashed up on the display.
Breakdown Testing
The suitable ramp rate for the test to be performed should be selected using the ‘
s
’
key. The
START
key ‘ ‘ will then turn on the high voltage. The red H.V. indicator
will light to show the output voltage is on. The voltage will then increase at the
selected ramp rate and the corresponding value will be shown on the display. If oil
breakdown occurs the instrument will detect this and immediately shut off the high
voltage. The breakdown voltage value will be left on the display until the next test is
started. If no breakdown occurs, the high voltage will rise to
60 kV. At this point the test voltage is cut off and this maximum value left on the
display.
A test can be stopped at any time by pressing the
STOP
‘
■
’ button. This will remove
the high voltage from the oil sample and leave the display at
0,0 kV
.
Withstand Testing
A Withstand (proof) test can be carried out by pressing the
PAUSE
‘ ‘ key. This will
maintain the high voltage at the current value for one minute. After this time the
high voltage will continue to rise until one of the following:-
1) Oil breakdown occurs
2) The
STOP
‘
■
’ key is pressed
3) The output voltage reaches the maximum value of the test set.
During withstand testing the ramp rate can be changed while the pause is in
progress. This can allow the withstand test value to be accurately set by adjusting the
ramp rate to the lowest value.
6.
Mains
on/off
switch
HV on
indicator
Ramp rate
selection
Main
controls
LED
Display
Control Panel
s
