Abstract: The local leakage signal of high-voltage insulation equipment is weak and its characteristics are not

obvious，which can only explain whether there is discharge. There is a phenomenon of missing judgment and

misjudgment in the actual positioning process，which is difficult to accurately locate the high-voltage insulation fault on the equipment. In order to solve this problem，a local leakage positioning method of high-voltage insulation equipment based on optical fiber sensor was proposed. The network generated by high-voltage insulation equipment was equivalent to a centralized parameter model，the local leakage fault model of high-voltage insulation equipment was established，and the current change of high-voltage insulation equipment with local leakage fault was analyzed.The plane cross array was selected to arrange the optical fiber sensor array and determine the layout position of the optical fiber sensor；the operating parameters of high voltage insulation equipment were collected. Based on the "photoelastic effect" generated by the optical fiber emitted by the optical fiber sensor and the local current，the highvoltage insulation equipment with local leakage fault can be accurately located through the change of the parameter value of the ground capacitance in the fault model and the accurate change of the optical phase of the optical fiber sensor，so as to realize the research on the local leakage location of the high-voltage insulation equipment. The experimental results show that，compared with the comparison method，the sensor layout set by the research method can obtain more accurate operating parameters of high-voltage insulation equipment and improve the accuracy of local leakage location of high-voltage insulation equipment.

      Key words: optical fiber sensor；high voltage insulation；insulated equipment；local leakage；leakage location；positioning method