Electrical tree growth in epoxy resin under DC voltages

This work investigates electrical tree propagation in a glassy epoxy resin under constant DC voltages of +60 kV and -60 kV, using samples with classical needle-plane electrodes but having small AC trees (henceforth called `initial trees') incepted prior to the DC tests. The characteristics of D...

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Bibliographic Details
Published in2016 IEEE International Conference on Dielectrics (ICD) Vol. 2; pp. 820 - 823
Main Authors Iddrissu, Ibrahim, Hualong Zheng, Rowland, Simon M.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2016
Subjects
AC pre-incepted initial tree
Cameras
DC treeing
Electric breakdown
Electrical tree
Electrodes
epoxy resin
Epoxy resins
growth rate
Needles
Shape
Space charge
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Summary:This work investigates electrical tree propagation in a glassy epoxy resin under constant DC voltages of +60 kV and -60 kV, using samples with classical needle-plane electrodes but having small AC trees (henceforth called `initial trees') incepted prior to the DC tests. The characteristics of DC trees propagating from an initial tree is analysed via a sequence of 2-D projections of trees captured using a CCD camera during the test. The experimental results suggest that DC tree growth rate is polarity dependent even when initiated by the presence of an initial AC tree. The shape of the initial AC tree does not have a profound influence on the shape of the DC tree. The length of the initial tree, however, may have a determinant influence on the growth of DC tree. DC treeing exhibits a runway propagation and statistical analysis suggests that tree growth starts to accelerate after reaching a certain distance across the insulation.
DOI:10.1109/ICD.2016.7547742