Department of Electrical Engineering, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
Sensors (Basel). 2019 Feb 14;19(4):778. doi: 10.3390/s19040778.
An improved current sensor aimed at measuring currents of different parts in composite insulator samples was proposed. Conventional current sensors used in water diffusion tests aim to examine the performance of composite insulators, however, it is difficult for the conventional current sensors to locate the defects. Thus, we designed a new electrode structure to measure the currents of different components in short samples of composite insulators. Based on a finite analysis method, the influence of relative permittivity and conductivity on the current was analyzed. New samples with different interfaces and samples after operation were tested using the new and conventional current sensors. The performance of a certain part in short samples can be diagnosed by analyzing the current and phase information extracted from the test results. By comparing the test results of new and traditional current sensors, it was proved that the new electrode structure is more effective in locating the defects of insulators.
提出了一种改进的电流传感器，旨在测量复合绝缘子样品中不同部位的电流。用于水扩散测试的传统电流传感器旨在检查复合绝缘子的性能，但传统电流传感器很难定位缺陷。因此，我们设计了一种新的电极结构，以测量复合绝缘子短样中不同部件的电流。基于有限元分析方法，分析了相对介电常数和电导率对电流的影响。使用新的和传统的电流传感器对具有不同界面的新样品和运行后的样品进行了测试。通过分析从测试结果中提取的电流和相位信息，可以诊断短样中某一部分的性能。通过比较新的和传统电流传感器的测试结果，证明了新的电极结构在定位绝缘子缺陷方面更有效。
