特高频(ultra high frequency,UHF)局放检测是变压器油纸绝缘缺陷定位的常用方法,实际应用过程中局放定位准确性易受噪声和传感器布置方式影响.为保证变压器油纸绝缘缺陷局放定位检测有效性,文中首先建立油纸绝缘缺陷UHF局放定位检测平台,在常规K-means方法的基础上,提出基于修正聚类分界的变压器油纸绝缘缺陷局放抗干扰定位方法,有效降低了定位误差.然后针对样本聚类分界混叠问题,选择最优修正系数L为1.1时,UHF局放定位误差可减小至0.1 m内,验证了文中方法的有效性.最后分析不同传感器布置方式的定位误差变化规律,提出变压器油纸绝缘缺陷检测用UHF传感器优化布置方案,可为变压器局放在线监测传感器布置及定位提供参考.
UHF anti-interference positioning and optimal layout method of oil-paper insulation defect partial discharge
Ultra high frequency(UHF)partial discharge(PD)detection is a common method for transformer oil-paper insulation defect location.However,the accuracy of PD positioning in practical application is easily affected by noise and sensor layout.In order to ensure the effectiveness of PD positioning detection of transformer oil-paper insulation defect,an UHF PD positioning detection platform for oil-paper insulation defects is established.Based on the conventional K-means method,a modified clustering demarcation PD anti-interference positioning method is proposed,which effectively reduces the positioning error.Aiming at the problem of sample clustering demarcation aliasing,when the optimal correction coefficient L is 1.1,the UHF PD positioning error can be reduced to less than 0.1 m,which verifies the effectiveness of the proposed method.Finally,the variation law of positioning error of different sensor layout is analyzed,and the optimal layout scheme of UHF sensor for transformer oil-paper insulation defect detection is proposed,which can provide reference for the layout and positioning of transformer on-line monitoring sensor.
transformeroil-paper insulation defectsultra high frequency(UHF)detectionanti-interferencepartial discharge positioningclustering demarcation
万方数据
维普
