【摘要】 针对时域介电响应法的弛豫响应参数求解的不确定性及特征量提取不够直接、物理意义不易描述等问题,提出基于直接确定性参数辨识与弛豫法谱线特征量的变压器油、纸绝缘老化诊断新方法。首先,采用末端双点解析法确定去极化电流谱线中的弛豫参量;分别绘制表征变压器绝缘油、绝缘纸状态的弛豫最小、最大法谱线,直接提取4个新特征量:弛豫最小法向角θ_τmin、弛豫最小法线长P_τmin、弛豫最大法向角θ_τmax、弛豫最大法线长P_τmax;经研究分析证实:绝缘油老化程度越严重,θ_τmin越小,P_τmin越短;绝缘纸老化程度越严重,θ_τmax越小,P_τmax越短。多台变压器试验验证:依据新特征量能有效诊断出油、纸绝缘老化状态;弛豫参量辨识新方法和新特征量提取为油纸绝缘老化诊断提供了新思路。更多还原

【Abstract】 Aiming at the problem of uncertainty in parameter solution of relaxation response,the indirect extraction of feature quantities and the difficultly in describing physical meaning in the relaxation response parameters extraction for the time domain dielectric response method,a method for diagnosing the aging state of transformer insulating paper and insulating oil based on direct deterministic parameter identification and characteristic parameters extraction was proposed. Firstly,a terminal two-point analytical method was used to determine the relaxation parameter in the depolarization current spectrum. The relaxation minimum spectrum and maximum spectral spectrum which characterize the state of transformer insulating oil and insulating paper were drawn separately,and four new feature quantities were directly extracted:relaxation minimum normal angle θ_τmin,relaxation minimum normal length P_τmin,relaxation maximum normal angle θτmax,relaxation The maximum normal length P_τmax. It has been confirmed by research and analysis that the more severe the aging of insulating oil is,the smaller the θ_τminand shorter the P_τmin,the more severe the aging of insulating paper,the smaller the θ_τmax and shorter the P_τmax. Test verification of multiple transformers: according to the new feature quantity,the aging state of oil and paper insulation can be effectively diagnosed; the new method of relaxation parameter identification and new feature quantity extraction provide a new idea for oil-paper insulation aging diagnosis.更多还原