Abstract:
In this paper, dc electrical treeing breakdown
experiments are conducted using needle-plane system.
Electrical treeing test can be used for the assessment of life
estimation of the insulating material by estimating the voltage
endurance coefficient and accumulated damage. Damage
equalization method (DEM) is used for estimating the life of the
dielectric material used in HVDC cables. Breakdown
experiments are conducted with progressive voltage steps of
different step size. Interesting new results on the role of different
step size on breakdown voltage is reported which in turn shows
the effect of space charge injection and accumulation. The
results from the space charge distribution in a plane-plane
geometry justify the authors’ results on the effect step size on dc
breakdown in needle-plane geometry. The experimental results
obtained are compared with data available in the literature for
ac electrical treeing tests for different rate of progressive voltage
rise.
