宽动态范围的有源集成传感系统的研究与设计
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辛文成(1985-),男,硕士,高级工程师,主要从事电力设备状态评价与检测方面的研究;E-mail:1363376120@qq.com

中图分类号:

TM835.4

基金项目:

南方电网公司重点科技项目(GZHKJXM20200001)


Research and design of active integrated sensor system with wide dynamic range
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    摘要:

    针对窄带采集检测到的局部放电缺陷种类少的问题,宽动态范围的有源集成传感系统的研究很有必要。首先,在同轴波导模型下,通过对 GIS内局放电磁传播的衰减分析和 HFSS仿真,得到较长 GIS中有效检测PD信号至少需要40dB的动态范围;其次,通过对比分析,确定通过对数域变换来增加系统的动态范围,选择蝶形天线作为局部放电检测用天线并对尺寸进行优化,其在730MHz~1.05GHz频率范围驻波比小于2;最后,设计宽动态范围的降频模拟电路,开发对数检波技术用于 GIS局部放电检测。该文实现了天线、检波电路、信号调理以及发射高度集成的 UHF局放检测传感系统,其不仅具有优秀的信噪比并且极大地降低了整套采集系统的成本,这对局部放电的检测和精准运维具有现实意义。

    Abstract:

    To solve the problem of few PD defects detected by narrowband acquisition, it is necessary to study the active integrated sensor system with wide dynamic range. In this paper, according to the attenuation analysis of local electromagnetic propagation in GIS under coaxial waveguide model and HFSS simulation, it is found that a dynamic range of at least 40 dB is required for the effective detection of PD signal in long GIS. Secondly, through comparative analysis, the dynamic range of the system can be increased by logarithmic domain transformation, and the butterfly antenna with the optimized size is selected as the antenna for partial discharge detection. The standing wave ratio of the butterfly antenna is less than 2 in the frequency range of 730 MHz~ 1.05 GHz. Finally, a wide dynamic range of frequency-reduction analog circuit is designed, and logarithmic detection technology is developed for GIS partial discharge detection. This paper realized the antenna, detection circuit, signal conditioning and transmission highly integrated UHF local discharge detection sensor system. It not only has excellent signal-to-noise ratio but also greatly reduces the cost of the whole collection system, which has practical significance for PD detection and accurate operation and maintenance.

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辛文成,姚森敬,陈浩敏,等.宽动态范围的有源集成传感系统的研究与设计[J].电力科学与技术学报,2022,37(4):189-197.
Xin Wencheng, Yao Senjing, Chen Haomin, et al. Research and design of active integrated sensor system with wide dynamic range[J]. Journal of Electric Power Science and Technology,2022,37(4):189-197.

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  • 在线发布日期: 2022-09-23
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