In view of the reliability of the on-line monitoring device for transmission lines, this paper puts forward a comprehensive evaluation method combining the analytic hierarchy process and the fuzzy evaluation method, in order to realize the reliability evaluation of the on-line monitoring device for transmission lines. Firstly, the structure of reliability evaluation system, which is composed of environmental factors, installation factors, human factors and management level factors, is

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... d. Then, based on the evaluation system, the reliability of the on-line monitoring device for transmission lines is evaluated by fuzzy evaluation. Finally, according to the principle of maximum membership, the reliability of an on-line monitoring device for a transmission line is judged. The results show that the comprehensive evaluation method can well reflect the reliability of the on-line monitoring device for transmission lines, and provides a theoretical and practical basis for the reliability evaluation of the on-line monitoring device for transmission lines.