The surges have to be applied
synchronized to the voltage phase at
the respective angle and the peak
value of the a.c. voltage wave (positive
and negative).
The surges have to be applied line to
line and line(s) and earth. When
testing line to earth the test voltage
has to be applied successively
between each of the lines and earth.
The test voltage has to be increased
by steps from the lowest test level up
to the test level specified in the product
standard or test plan.
Within this test routine all standard parameters can be changed online during testing. This procedure therefore is
very easy and fast to use.