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40 dB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730 MHz~1.05 GHz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。
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.
作者
辛文成
姚森敬
陈浩敏
席禹
张凡
敖榜
申晨
林晓青
汪沨
XIN Wencheng;YAO Senjing;CHEN Haomin;XI Yu;ZHANG Fan;AO Bang;SHEN Chen;LIN Xiaoqing;WANG Feng(ChinaSouthern Power Grid Digital Grid Research Institute Co.,Ltd.,Guangzhou 510000,China;Electric Power Science Research Institute,State Grid Shanxi Electric Power Co.,Ltd.,Xi′an 710199,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)
出处
《电力科学与技术学报》
CAS
北大核心
2022年第4期189-197,共9页
Journal of Electric Power Science And Technology
基金
南方电网公司重点科技项目(GZHKJXM20200001)。
关键词
宽动态范围
局部放电
特高频
传感系统
检测
wide dynamic range
partial discharge
high frequency
sensing system
detection
