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In order to improve the accuracy of relative permittivity measurement by means of non-contact method, we built a corresponding model by electric field finite element analysis and obtained the distribution of electric field and potential of the electrode and around. The edge effect of electrode was analyzed and its influences on the measuring result of relative permittivity were investigated. In addition, the influence of potential factors on the measuring error of non-contact method was analyzed, and then the factors which should be taken into consideration in the correction was confirmed, which were the electrode gap distance, the ratio of sample thickness to electrode gap distance, and the relative permittivity. The results show that the measuring error of relative permittivity increases with the increase of electrode gap distance and relative permittivity of the sample, while decreases with the increase of the ratio of sample thickness to electrode gap distance. Under the model with the electrode gap distance of 0.2-5 mm, the ratio of sample thickness to electrode gap distance of 0.5-1, the relative permittivity of 1-20, 2 380 groups of actual and calculated values of relative permittivity are obtained, and the relative error is -0.37%--41.72%. According to the above relationship among the electrode gap distance, the ratio of sample thickness to electrode gap distance, the measured value and real value of relative permittivity, the measured relative permittivity is then corrected by the 3D interpolation method and matching method. The correction method is verified by simulation and is used to correct the measured relative permittivity of high temperature vulcanized silicone rubber. The results validate the proposed method.
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为了提高基于非接触法的相对介电常数测量的准确性,利用电场有限元分析建立对应的模型并获得了电极及其附近的电场和电位分布。分析了电极系统存在的边缘效应,给出了其对相对介电常数测量结果的影响。分析了潜在因素对非接触法测量误差的影响,确定了修正时需要考虑的因素为电极间隙距离、试样厚度与电极间隙距离之比和试样的相对介电常数。根据电极间隙距离、距离比、相对介电常数测量值到相对介电常数真实值的关系,采用三维插值法和匹配法修正测得的相对介电常数。采用仿真对修正方法进行了验证并针对实测高温硫化硅橡胶相对介电常数使用了该方法,结果验证了该方法的有效性。结果表明:随着电极间隙距离和试样相对介电常数的增加误差幅值增大,随距离比的增加误差存在减小的趋势。对电极间隙距离、距离比和相对介电常数分别在0.2~5 mm、0.5~1和1~20内建模获得2 380组相对介电常数的真实值和计算值,发现相对误差在-0.37%~-41.72%内变化。
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魏力强(1985-),男(汉族),河北邢台人,高级工程师,主要从事电力电缆寿命评估和诊断技术的相关研究。
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Schematic diagram of electrode, figureFileSmall=SPWGFPWO423g3abmQ6I0uQ==, figureFileBig=xPgzE8XgLozeAkZwdkOk0A==, tableContent=null), ArticleFig(id=1243119749459198297, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图1, caption=
电极示意图, figureFileSmall=SPWGFPWO423g3abmQ6I0uQ==, figureFileBig=xPgzE8XgLozeAkZwdkOk0A==, tableContent=null), ArticleFig(id=1243119749551472989, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.2, caption=
Imaginary part of relative permittivity of HTV with contact and contact-free methods at different frequencies, figureFileSmall=YWvmE1IWXbn2vfnYNMhUcQ==, figureFileBig=nGcvWJbeiY+qFgMfC947WA==, tableContent=null), ArticleFig(id=1243119749668913505, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图2, caption=
不同频率下接触法和非接触法测得的HTV相对介电常数虚部, figureFileSmall=YWvmE1IWXbn2vfnYNMhUcQ==, figureFileBig=nGcvWJbeiY+qFgMfC947WA==, tableContent=null), ArticleFig(id=1243119749773771110, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.3, caption=
Electrode system, figureFileSmall=NMLEYEw+iz/xOykshnztLw==, figureFileBig=y+yoa1S+uNTA0doGVE5WoA==, tableContent=null), ArticleFig(id=1243119749866045802, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图3, caption=
电极系统实物, figureFileSmall=NMLEYEw+iz/xOykshnztLw==, figureFileBig=y+yoa1S+uNTA0doGVE5WoA==, tableContent=null), ArticleFig(id=1243119749966709102, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.4, caption=
Modeling results of electrode system, figureFileSmall=XvjtUzB4E0sg7pXWj88hzQ==, figureFileBig=+eIvVyx82Mj5JlyUh7LrRg==, tableContent=null), ArticleFig(id=1243119750025429360, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图4, caption=
电极系统的建模结果, figureFileSmall=XvjtUzB4E0sg7pXWj88hzQ==, figureFileBig=+eIvVyx82Mj5JlyUh7LrRg==, tableContent=null), ArticleFig(id=1243119750130286965, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.5, caption=
Meshing results of electrode system, figureFileSmall=cLUhlG5KZCTWOOIpFOYUpQ==, figureFileBig=yLb+zA0/QPbgJh4BHaeDYQ==, tableContent=null), ArticleFig(id=1243119750214173046, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图5, caption=
电极系统网格剖分结果, figureFileSmall=cLUhlG5KZCTWOOIpFOYUpQ==, figureFileBig=yLb+zA0/QPbgJh4BHaeDYQ==, tableContent=null), ArticleFig(id=1243119750302253435, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.6, caption=
Potential and electric field strength distributions of electrode system with sample calculated byfinite element method, figureFileSmall=PygzJqQfoei9mTnISNi0pQ==, figureFileBig=4hZZjRon95RVG6eTAY1f3w==, tableContent=null), ArticleFig(id=1243119750386139520, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图6, caption=
有限元法算得含有试样电极系统的电位和场强分布, figureFileSmall=PygzJqQfoei9mTnISNi0pQ==, figureFileBig=4hZZjRon95RVG6eTAY1f3w==, tableContent=null), ArticleFig(id=1243119750495191425, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.7, caption=
Potential and electric field strength distributions of electrode system without sample calculated byfinite element method, figureFileSmall=Fd6bWrc4h4c1snsMRsFYSQ==, figureFileBig=KdJo464hN2zOVwqj28yreA==, tableContent=null), ArticleFig(id=1243119750583271812, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图7, caption=
有限元法算得不含试样电极系统的场强和电位分布, figureFileSmall=Fd6bWrc4h4c1snsMRsFYSQ==, figureFileBig=KdJo464hN2zOVwqj28yreA==, tableContent=null), ArticleFig(id=1243119750679740807, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.8, caption=
Influence of electrode space distance, ratio of sample thickness, and relative permittivity on error in the relative permittivity, figureFileSmall=80j5jmAHsnLJRc4BS+tKBg==, figureFileBig=2CpfSSNkQJPvMDivz2Fsaw==, tableContent=null), ArticleFig(id=1243119750784598412, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图8, caption=
电极间隙距离、距离比和相对介电常数对相对介电常数误差的影响, figureFileSmall=80j5jmAHsnLJRc4BS+tKBg==, figureFileBig=2CpfSSNkQJPvMDivz2Fsaw==, tableContent=null), ArticleFig(id=1243119750872678800, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.9, caption=
Correction factor of relative permittivity at different electrode space distances with contact-free method, figureFileSmall=uW52TmYbDhYFndSf7t3LoA==, figureFileBig=USmC7wvyz2yevFhX1DTRcQ==, tableContent=null), ArticleFig(id=1243119750973342096, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图9, caption=
非接触法下不同电极间隙距离时下的相对介电常数修正系数, figureFileSmall=uW52TmYbDhYFndSf7t3LoA==, figureFileBig=USmC7wvyz2yevFhX1DTRcQ==, tableContent=null), ArticleFig(id=1243119751053033876, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.10, caption=
Correction factor of relative permittivity at different electrode space distances and measured relative permittivities with contact method, figureFileSmall=oXwAHvyUZq3ekRPW0N76Ww==, figureFileBig=8sQW6b8VL+RgY/1LursYxw==, tableContent=null), ArticleFig(id=1243119751120142743, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图10, caption=
接触法下不同电极间隙距离和相对介电常数计算值时的相对介电常数修正系数, figureFileSmall=oXwAHvyUZq3ekRPW0N76Ww==, figureFileBig=8sQW6b8VL+RgY/1LursYxw==, tableContent=null), ArticleFig(id=1243119751183057306, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Fig.11, caption=
Difference between the measured relative permittivity before and after corrections, figureFileSmall=4Ajk4dYNSBKNc4KfT0Zy+w==, figureFileBig=TSQ6W/RMDy4Eij8TB5XDSg==, tableContent=null), ArticleFig(id=1243119751262749086, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=图11, caption=
实测的相对介电常数修正前后的差距, figureFileSmall=4Ajk4dYNSBKNc4KfT0Zy+w==, figureFileBig=TSQ6W/RMDy4Eij8TB5XDSg==, tableContent=null), ArticleFig(id=1243119751363412387, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=EN, label=Tab.1, caption=
Relative errors statistics in the evaluated relative permittivity before and after correction, figureFileSmall=null, figureFileBig=null, tableContent=
| 方法 | 最大值/% | 最小值/% | 均值/% | 标准差/% |
|---|
| 修正前 | -1.93 | -41.19 | 21.41 | 10 |
| 匹配法 | 3.24 | -4.18 | 2.34 | 1.45 |
| 快速凸包-近邻 | 31.31 | -24.35 | 7.68 | 8.91 |
| 快速凸包-线性 | 0.71 | -7.72 | 1.02 | 1.23 |
), ArticleFig(id=1243119751485047208, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222495720683328087, language=CN, label=表1, caption=
修正前后相对介电常数相对误差的统计值
, figureFileSmall=null, figureFileBig=null, tableContent=
| 方法 | 最大值/% | 最小值/% | 均值/% | 标准差/% |
|---|
| 修正前 | -1.93 | -41.19 | 21.41 | 10 |
| 匹配法 | 3.24 | -4.18 | 2.34 | 1.45 |
| 快速凸包-近邻 | 31.31 | -24.35 | 7.68 | 8.91 |
| 快速凸包-线性 | 0.71 | -7.72 | 1.02 | 1.23 |
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