基于F-P光纤传感器的变压器油中双局部放电源定位研究

A study on locating dual partial discharge sources in transformer oil utilizing F-P fiber optic sensor array

电力变压器作为电力系统中至关重要的能量转换设备,其稳定运行对于保障电能供应的可靠性具有重大意义。局部放电影响高压电气设备绝缘性能。局部放电在线监测不仅可以获取设备老化信息,还可以预测变压器寿命。局部放电源准确位置信息可以帮助检修人员制定精准维护计划,确保电力系统稳定,设备制造商可利用此信息优化结构和安装方法。变压器内部双局部放电源放电是一种更为复杂的故障类型,传统的检测方法难以准确捕捉到此类放电波形。F-P光纤传感器是一种新型的局部放电声学检测方式,该传感器结构小,灵敏度高,而且有较强的抗电磁干扰能力,可以内置于变压器内部实现复杂情况下的局部放电检测。在本研究中,研制了基于F-P光纤传感器的双局部放电源检测系统,采用基于多信号分类(MUSIC)测向原理的交叉定位算法,可以实现对变压器油中双局部放电源定位。总的来说,F-P光纤传感器阵列有较好的方向清晰度,可以实现准确定位。将该双局部放电源定位系统应用到了35 kV单相变压器模型上,验证了其对外绕组双局部放电源定位的有效性。

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 insulation 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 partial 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 method.Dual partial discharge sources within a transformer is a more complex type of fault.Traditional detection methods 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-electromagnetic interference ability,and can be built into the transformer to achieve partial discharge detection in complex situations.In this study,a dual partial discharge sources detection system based on the F-P optical fiber sensor 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 localization system was applied to a 35 kV single-phase transformer winding,verifying its effectiveness in locating dual partial discharge sources on the outer winding.