A study on locating dual partial discharge sources in transformer oil utilizing F-P fiber optic sensor array
The power transformer is one of the crucial devices for energy exchange in the power system,and its safe and stable operation is directly related to the reliability of electric energy supply.Partial discharge affects the insu-lation performance of high-voltage electrical equipment.Online monitoring of partial discharge can not only obtain the equipment aging information,but also predict the transformer life.The accurate position information of the par-tial discharge source can help maintenance personnel formulate precise maintenance plans to ensure the stability of the power system.Equipment manufacturers can use this information to optimize the structure and installation meth-od.Dual partial discharge sources within a transformer is a more complex type of fault.Traditional detection meth-ods have difficulties in accurately capturing such discharge waveforms.The F-P optical fiber sensor is a new type of acoustic detection method for partial discharge.This sensor has a small size,high sensitivity,and strong anti-elec-tromagnetic interference ability,and can be built into the transformer to achieve partial discharge detection in com-plex situations.In this study,a dual partial discharge sources detection system based on the F-P optical fiber sen-sor was developed,which adopted a cross-localization algorithm based on the MUSIC direction finding principle to achieve accurate localization of dual partial discharge sources inside the transformer.The F-P optical fiber sensor array has good directional clarity and can achieve accurate localization.This dual partial discharge sources localiza-tion system was applied to a 35 kV single-phase transformer winding,verifying its effectiveness in locating dual par-tial discharge sources on the outer winding.
partial dischargeF-P optical fiber sensorcrossing location by direction findingdual partial dis-charge localization
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