Abstract
The possibility of the new diagnostic method of water tree degradation is examined by observing the high field AC dissipation current waveforms and the space charge formation in water-tree-degraded low-density polyethylene (LDPE) films. The AC dissipation current waveforms of water-tree-degraded LDPE film contains more higher harmonic components than those of undegraded films. Furthermore, the differences between undegraded and water-tree-degraded films were observed in their space charge distribution. It can be speculated that the space charge was formed by the carrier injection from the water-tree-degraded region rather than the effect of the impurity ions in the bulk of the materials. The distortion of the high field AC dissipation current waveforms in water-tree-degraded LDPE films is considered to have some correlation to the space charge formation.
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