Abstract
Starting from the definition and classification of knowledge, this paper gives the definition and classification of substation maintenance knowledge. Based on the "seven-step method", it proposes a method of constructing knowledge ontology for narrow fields, including 9 steps, and establishes substation maintenance knowledge Ontology, including 13 concepts and 60 attributes, lists the concepts and attribute descriptions of the ontology, laying the foundation for the next step of building a knowledge navigation map.
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