Abstract
This paper presents an expert system on insulation diagnosis of medium voltage XLPE cables. Many diagnostic methods have been proposed for the deterioration of XLPE cables. However, most methods can not be used to the insulation diagnosis as live-line methods. The authors built the system whose knowledge base includes a live-line diagnostic method. In the system, fuzzy inference is used as an inference engine to reflect the knowledge and experience of experts for their diagnosis under the conditions, and its rules are formed based on their actual knowledge and heuristic experience. Moreover, residual breakdown voltages can be also estimated by the method of the fuzzy inference in the proposed system. Finally, it is shown that the resultant diagnosis of the system agrees well with that of experts.
