Real-time monitoring and early warning method for overheating state of power equipment

The invention relates to the technical field of power equipment monitoring, in particular to a power equipment overheating state real-time monitoring and early warning method, and the method comprises the steps: obtaining a voltage discrete signal and a current discrete signal; acquiring a contact resistance fluctuation sequence; acquiring amplitude spectrums and phase spectrums of the resistance fluctuation subsequences of the contacts; obtaining a contact resistance value high-frequency disturbance coefficient and a contact resistance value phase dispersion coefficient of each subsequence according to the amplitude spectrum and the phase spectrum of each subsequence; obtaining steady-state coefficients of the subsequences; acquiring a steady-state highlight heterogeneity index of the contact resistance value of the time window; acquiring a local outlier distance factor of each time window; obtaining a contact resistance outlier in each time window; therefore, real-time monitoring of the overheating state of