Abstract: It is common for the concrete poles of overhead transmission lines to crack in protection layer and rust in reinforcement due to the long-term load action and poor environment, which has significant adverse impacts on the function of overhead transmission lines. Based on the characteristics and relevant research results of concrete poles, a three-phase assessment system, an AHP(analytic hierarchy process)-based assessment method and a structural reliability theory-based gradation method are proposed respectively for the safety, safety state and safety performance of the concrete poles of overhead transmission lines. With these research results a complete safety assessment system is established for the concrete poles of overhead transmission lines, which is significant for accurately understanding the health state of the concrete poles, perfecting the service work of equipment and ensuring the steady function of overhead transmission lines.

Key words: overhead transmission line, safety condition, reliability, analytic hierarchy process