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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...
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