4.2 fastness test voltage impulse and test the stability of the scale factor
to ensure that the insulation keeps the inside of the high voltage will not cause a breakdown while in use. Needed to be voltage divider rider made fastness test pressure. They will be tested with the input voltage impulse was both positive and negative, 110% of the voltage limit or 330 kV poles 10 times if the breakdown or failure light on the surface no more than two times as the insulation pass. Testing
, testing the stability of the scale factor. They will be tested by an input voltage ranging from 0 - 300 kV voltage will increase by more than 50 kV and apply analysis results are comparable with the standard set.
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