介电响应分析中温度归一化获得标准曲线的方法、意义及应用

发布时间：2018-04-27 19:01

本文选题：介电响应 + 温度归一化方法　；参考：《中国电机工程学报》2017年15期

【摘要】：温度是影响电介质介电响应的重要外界因素。将不同温度条件下测量获得的介电响应曲线平移而形成相互重叠的介电响应曲线的方法即温度归一化方法,所获得的重叠的介电响应曲线即为标准曲线(master curve)。为获得正确的标准曲线,需要在双对数坐标中对极化率的实部和虚部同时进行温度归一化平移、并记录平移的移动轨迹(即参考点的移动轨迹)。参考点的移动轨迹即反映了温度对于介电响应的影响。标准曲线可以扩展所测介电响应的频率范围、增加数据点的密集程度,消除试验中的偶然误差,提高试验结果的准确性。标准曲线可以用于判断测量的介电响应是否是由单一的弛豫过程构成、判断电介质的微观结构是否随着温度的变化而变化、获得介电响应的温度特性等。通过温度归一化平移获得重合的标准曲线并非必然结果,在由温度特性不一致的多弛豫过程组成的介电响应中或在电介质微观结构发生变化的温度范围内,是无法获得重合的标准曲线的。该文以测量高电压外绝缘领域常用的高温硫化硅橡胶的介电响应为例,详细说明了温度归一化方法在介电响应分析中的应用。
[Abstract]:Temperature is an important external factor affecting dielectric response. The method of temperature normalization is the method of translating the measured dielectric response curves under different temperature conditions to form overlapping dielectric response curves. The overlapping dielectric response curves obtained are called master curvee curves. In order to obtain the correct standard curve, the temperature normalized translation of the real part and the imaginary part of the polarizability should be carried out simultaneously in the logarithmic coordinates, and the track of the translation (that is, the trajectory of the reference point) should be recorded. The trajectory of the reference point reflects the effect of temperature on the dielectric response. The standard curve can expand the frequency range of the measured dielectric response, increase the density of the data points, eliminate the accidental error in the test, and improve the accuracy of the test results. The standard curve can be used to determine whether the measured dielectric response is composed of a single relaxation process, to determine whether the microstructure of the dielectric varies with temperature, and to obtain the temperature characteristics of the dielectric response. The standard curve of coincidence obtained by normalized temperature translation is not a necessary result. In the dielectric response consisting of multiple relaxation processes with inconsistent temperature characteristics or in the temperature range of the change in the microstructure of the dielectric, No coincidence standard curve can be obtained. In this paper, the dielectric response of high temperature vulcanized silicone rubber in the field of high voltage external insulation is measured as an example, and the application of temperature normalization method in dielectric response analysis is described in detail.
【作者单位】：国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司);电力系统及发电设备控制和仿真国家重点实验室(清华大学电机工程与应用电子技术系);输配电装备及系统安全与新技术国家重点实验室(重庆大学);莱斯特大学工程系;
【分类号】：TM21

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