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。
Temperature is a significant external influence of dielectric response. The temperature normalization method consists in shifting the dielectric response measured at different temperature into coincidence, by which the ＇master curve＇ is determined. In order to obtain the correct master curve, the temperature normalization method should be carried out in log-log plot by shifting the real and imaginary components of susceptibility simultaneously. The locus of the reference point in the translation process should also be recorded in detail. The master curve can expand the frequency range and increase the data density of the measured data, which has the effect of eliminating measurement errors and increasing the veracity. The master curve can be used to determine the dielectric response whether it consisting of a single relaxation process or not, to determine the micro-structure of dielectric changing with temperature or not, and to determine the temperature dependence of dielectric response. It is worth to point out that to obtain a single master curve is not an inevitable result： in the condition of the dielectric response consisting of multi relaxation processes with different temperature dependence and in the temperature range where the structure of dielectric changes, a single master curve cannot be obtained. The master curve of dielectric response of HTV silicone rubber was constructed to explain and demonstrate the relevant issues in the application of the temperature normalization method.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2017年第15期4530-4537,共8页
Proceedings of the CSEE
关键词
介电响应
温度归一化方法
标准曲线
极化率
高温硫化硅橡胶
低频弥散
dielectric response
temperature normalizationmethod
master curve
susceptibility
HTV silicone rubber
Quasi-dc
