10
requirements, enter the boost interface. At this time, after pressing the “HV on” button,
The system will automatically boost. When it reaches the set test current, it will stabilize
and start timing.After the timing is finished,system will automatically drop to 75% of the
original voltage.When voltage is stabilizing and the time starts over,system will
automatically drop to zero, show up the test results and print interface
（
P 4-4.7), to make
a selection after finished test.
4.After the test, turn off the power switch.
5.About the discharge
For zinc oxide arrester and other small capacitance test, normally they can discharge
through the resistor inside voltage booster . For the short cable and other slightly large
capacity of energy storage test, normally wait until the to test sample voltage
self-discharing to 20% of the test voltage, and then they can discharge by the equiped
discharging rod. The removal and replacement of the high voltage lead are allowed only
after the grounding cable is hung up after full discharging. For the long cable and other
super large capacity energy storage test products, special discharge equipment should be
used for discharging according to the cable length and energy storage situation. Generally,
it is not possible to discharge with small power discharge bar randomly equipped,
because the capacity is small and easy to burn down.
6.Examples of Test Methods
1.No-load boosting Removal Method
In normal tests, when all the other cables are connected, the cable connected to the
test sample is suspended, then read the corona and stray current I’ during no-load testing
and after rising to the test voltage, then connect the test sample to boost the voltage to
test voltage, finally read the total current I
1.
Leakage current of sample
：
I
0
= I
1
–I’
2.Precision measurement of high voltage side
When it is necessary to measure the leakage current precisely, the infrared
high-voltage micro-ammeter should be stringed on the high-voltage side (see Figure
