作者：张钰雯, 朱武, 王世萱, 金立鑫
作者单位：上海电力大学电子与信息工程学院，上海 201306
关键词：工程测量技术;大气电场监测装置;实证研究法;差分式电场传感器;低功耗;T型反馈网络
摘要：
针对户外场磨式地面电场仪存在的输入阻抗高、感应电流信号弱、易受外界电磁波干扰、功耗大且无市电供电等问题，设计一种光伏发电加蓄电池储能供电的低功耗大气电场监测装置。为减小系统功耗，提高测量精度，设计微型低速双定子差分式电场传感器，传感器感应到的两路微弱电流信号经过T型反馈网络实现I/U变换。通过减法器和4 Hz低通滤波器消除共模干扰和工频干扰，提高信号的信噪比。利用光传感器采集同步感应信号，与AD630锁相放大器配合对信号进行处理，得到与场强成正比例关系的直流电压。经实验验证，系统在-50~50 kV/m的模拟电场强度范围内，测量分辨力可达到10 V/m，测量线性度<1%。所设计系统能够在光伏供电的情况下独立运行，实时测量大气电场强度并将测量结果传输到上位机，为雷电监测预警提供必要的数据支持。
Design and implementation of monitoring device for miniature atmospheric electric field
ZHANG Yuwen, ZHU Wu, WANG Shixuan, JIN Lixin
College of Electronics and Information Engineering, Shanghai University of Electricity Power, Shanghai 201306, China
Abstract: To solve the problems of high input impedance, weak induced current signal, susceptibility to external electromagnetic wave interference, large power consumption, and no mains power supply for outdoor field mill ground electric field meters, a low power atmospheric electric field monitoring device with photovoltaic genertion and battery energy storage is designed. In order to reduce the power consumption of the systerm and improve the measurement accuracy, a miniature low-speed dual-stator differential electric field sensor is designed. The two weak current signals received by the sensor undergo I/U conversion through a T-shaped feedback network. The interference caused by shared mode and power frequency is eliminated through the subtractor and 4 Hz low-pass filter to improve the SNR(Signal to Noise Ratio). The photoreceptor is used to collect the synchronous induction signal, and cooperates with the AD630 lock-in amplifier to process the signal to obtain a direct voltage proportional to the field strength. It has been verified by experiments that the system has a measurement resolution of 10 V/m and a linearity of <1% in the simulated electric field strength ranging from -50 kV/m to 50 kV/m. The designed system is able to operate independently whith photovoltaic power supply. Moreover, it can measure the atmospheric electric field strength in real time and transmit the measurement results to the upper computer, providing necessary data support for lightning detection and early warning.
Keywords: engineering measurement technology;atmospheric electric field monitoring device;empirical research method;differential electric field sensor;low power consumption;T-type feedback network
2021, 47(4):130-135 收稿日期: 2020-06-18;收到修改稿日期: 2020-07-24
基金项目: 国网上海市电力公司群众性创新科技项目(H2018-118)
作者简介: 张钰雯（1995-），女，山东日照市人，硕士研究生，专业方向为地面电场仪的设计与研究
参考文献
[1] 谷山强, 王剑, 冯万兴, 等. 电网雷电监测数据统计与挖掘分析[J]. 高电压技术, 2016, 42(11): 3383-3391
[2] 李三雁, 杨昊东, 邓勇. 水力发电站智慧防雷措施与检测[J]. 中国测试, 2018, 44(11): 157-160
[3] 杨鹏飞, 陈博, 闻小龙, 等. 一种基于MEMS芯片的新型地面大气电场传感器[J]. 电子与信息学报, 2016, 38(6): 1536-1540
[4] 朱武, 潘伟杰, 张佳民. 基于地面电场仪的雷电监测装置设计[J]. 高电压技术, 2019, 45(5): 1490-1495
[5] 余海, 张廷龙, 刘文杰, 等. 基于小波分析对地面电场信号的去噪及闪电信息提取[J]. 自然科学版, 2020, 38(1): 67-74
[6] 崔勇, 袁海文, 赵录兴, 等. 基于有限元方法的场磨式电场传感器标定装置优化设计[J]. 北京航空航天大学学报, 2015, 41(10): 1807-1812
[7] LI X, RAO W, GENG D Z. Design and analysis of weak optical signal detection system based on photoelectric detection technology[J]. Journal of Nanoelectronics and Optoelectronics, 2018, 13(4): 458-466
[8] 涂春鸣, 管亮, 肖凡, 等. 双有源桥DC-DC变换器的模态分析方法[J]. 中国电机工程学报, 2019, 39(18): 5468-5479, 5595
[9] 梅晓妍, 胡国伟, 王民权. 投资最小化的均衡负载离网光伏系统优化设计[J]. 电源技术, 2015, 39(12): 2673-2676
[10] 郎平, 韩磊, 李岩. 低频微弱信号高精度检测研究[J]. 北京理工大学学报, 2020, 40(2): 150-156
[11] 张嘉伟, 高瑞祥, 杨成, 等. 一种具有偏置电流温度补偿的弱信号放大电路[J]. 仪表技术与传感器, 2019(6): 110-114
[12] 周佩丽, 张记龙, 王志斌. 光电离传感器中微电流检测电路的设计[J]. 传感器与微系统, 2011, 30(4): 108-110
[13] 蔡满军, 于彬, 赵晓东. 基于正交锁相放大器的微弱应变信号检测系统[J]. 仪表技术与传感器, 2017(4): 67-72
[14] 孔力, 石军, 徐方友, 等. 数字相敏检波技术在微电成像测井仪中的应用[J]. 仪表技术与传感器, 2010(2): 34-36, 41
[15] 王延召, 干喆渊, 周兵, 等. 金属盖板对高压直流合成场测量的影响[J]. 高电压技术, 2019, 45(2): 651-657
