Abstract:The residual charge method is one of the main degradation diagnostic methods for water tree degradation of XLPE cables. In this method, a DC voltage is applied to a water tree-degraded XLPE cable in order to accumulate space charges in water tree parts of an XLPE cable, and an AC voltage is applied to it in order to release deeply trapped space charges, i.e. residual charges. The authors have been developing a new diagnostic method with pulse voltages instead of DC and AC voltages since the method can be appli… Show more
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