基于光纤传感器的高压绝缘设备局部漏电定位方法

Local Leakage Location Method of High Voltage Insulation Equipment Based on Optical Fiber Sensor

高压绝缘设备局部漏电信号微弱、特征不明显,仅能说明是否有放电,实际定位过程中存在漏判、误判的现象,难以准确定位设备上存在的高压绝缘故障。为解决这一问题,提出了基于光纤传感器的高压绝缘设备局部漏电定位方法。将高压绝缘设备生成的网络等效成集中参数模型,建立高压绝缘设备局部漏电故障模型,分析存在局部漏电故障的高压绝缘设备电流变化;选择平面十字阵列布置光纤传感器阵列,确定光纤传感器布置位置;采集高压绝缘设备运行参数;以光纤传感器发射的光纤与局部电流产生的“光弹效应”为依据,通过故障模型中对地电容参数值变化和光纤传感器光相位的精准变化,精准定位存在局部漏电故障的高压绝缘设备,实现高压绝缘设备局部漏电定位研究。实验结果表明:所提方法与对比方法相比,研究方法设置的传感器布置方式能得到更加精确的高压绝缘设备运行参数、提高高压绝缘设备局部漏电定位准确度。

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.