Optimization of Space Charge Electro-Optical Detection System in Power Electronic Insulation: Toward High Sensitivity

IF 5.6 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Tianrun Qi;Hanwen Ren;Haoyu Gao;Qingmin Li;Xinjun He;Yidan Ma;Yiqun Ma;Tao Xiao
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Abstract

For high-resolution measurements of solid insulation space charge in complex stress environments, an optical measurement method of space charge based on the electro-optical effect is proposed. In this article, the whole process signal conversion mechanism and transmission model of the space charge electro-optical detection system are constructed. Furthermore, the key factors affecting measurement sensitivity are analyzed for the core electro-optical detection system. The results show that the measurement sensitivity shows a positive and negative correlation with the sensor electro-optical coefficient and sensor thickness, respectively. Simultaneously, it shows a decreasing trend in measurement sensitivity as the angle of incidence deviates from the Brewster angle of the electro-optical sensor. The optimal configuration of the measurement sensitivity can be realized by adjusting the incidence angle of the detection light, the electro-optical coefficient, and the thickness of the sensor. Expanding the measuring bandwidth further decreases the signal distortion. The detector bandwidth is the primary parameter that limits the behavior of the detecting system. Ultimately, a refined design for the electro-optical detecting system is suggested for sensitivity improvement. The significant sensitivity is obtained by incorporating the optical sampling technique. The experimental results demonstrate that the established detection system is capable of accurately measuring the picosecond pulsed electric field. The enhanced electro-optical detection system achieves measurement sensitivity at the $\mu $ V level and bandwidth in the THz range. The space charge measurements with nm resolution can be realized through the proposed detection system.
优化电力电子绝缘中的空间电荷光电检测系统:实现高灵敏度
针对复杂应力环境下固体绝缘空间电荷的高分辨率测量,提出了一种基于电光效应的空间电荷光学测量方法。本文构建了空间电荷光电检测系统的全过程信号转换机制和传输模型。此外,还分析了影响核心光电检测系统测量灵敏度的关键因素。结果表明,测量灵敏度分别与传感器电光系数和传感器厚度呈正相关和负相关。同时,当入射角偏离电光传感器的布鲁斯特角时,测量灵敏度呈下降趋势。通过调整检测光的入射角、电光系数和传感器厚度,可以实现测量灵敏度的最佳配置。扩大测量带宽可进一步减少信号失真。探测器带宽是限制探测系统性能的主要参数。最终,为提高灵敏度,建议对电子光学探测系统进行改进设计。通过采用光学采样技术,灵敏度大大提高。实验结果表明,所建立的检测系统能够精确测量皮秒脉冲电场。增强型光电检测系统实现了 $\mu $ V 级的测量灵敏度和太赫兹范围的带宽。通过所提出的检测系统,可以实现纳米分辨率的空间电荷测量。
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来源期刊
IEEE Transactions on Instrumentation and Measurement
IEEE Transactions on Instrumentation and Measurement 工程技术-工程:电子与电气
CiteScore
9.00
自引率
23.20%
发文量
1294
审稿时长
3.9 months
期刊介绍: Papers are sought that address innovative solutions to the development and use of electrical and electronic instruments and equipment to measure, monitor and/or record physical phenomena for the purpose of advancing measurement science, methods, functionality and applications. The scope of these papers may encompass: (1) theory, methodology, and practice of measurement; (2) design, development and evaluation of instrumentation and measurement systems and components used in generating, acquiring, conditioning and processing signals; (3) analysis, representation, display, and preservation of the information obtained from a set of measurements; and (4) scientific and technical support to establishment and maintenance of technical standards in the field of Instrumentation and Measurement.
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