To achieve high precision location of partial discharge（PD）defect during live detection

the electroacousticlocation modeling is performed on the transformer

gas insulated switchgear（GIS）and high voltage switchgear based on the time difference of arrival algorithm by exploiting the homology of photoelectric signals generated in PD process.Furthermore

the dependence of PD location accuracy of electrical equipment on the TDOA delay is reduced through the particle swarm optimization（PSO）of location results.Experiment demonstrates that the electroacoustic positioning and the PSO of location results are effective in further weakening the influence of external interference on the location accuracy.with high detection flexibility and location accuracy.This technique can be applied to the positioning of PD defects inside electrical equipment during live detection.