AC power grid voltage transmission state monitoring method and system

The invention discloses an AC power grid voltage transmission state monitoring method and system, and relates to the technical field of power grid fault diagnosis, and the method comprises the following steps: obtaining a real-time voltage value of each monitoring node in an AC power grid; analyzing the real-time voltage value to obtain an abnormal node proportion or an abnormal segment proportion; calculating to obtain a voltage state value; judging the voltage transmission state of the current alternating current power grid, and generating a transmission disqualification signal or a transmission qualification signal; when a transmission unqualified signal is obtained, acquiring a cable aging influence coefficient, and comparing to obtain a cable aging signal or a cable non-aging signal; when a cable aging signal is obtained, carrying out fault grade division on the cable of the abnormal voltage segment; according to the invention, the voltage change condition of the single monitoring node and the voltage ch