基于超声波时差法的变电站变压器冷却油流速测量  

Ultrasonic time-of-flight method based measurement of cooling oil flow velocity in substation transformer

作　　者：李乳演 谢桂辉 白迪 LI Ruyan;XIE Guihui;BAI Di(School of Information Science and Engineering,Wuchang Shouyi University,Wuhan 430064,China;School of Automation,China University of Geosciences,Wuhan 430074,China;College of Electronics and Information Engineering,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]武昌首义学院信息科学与工程学院,湖北武汉430064 [2]中国地质大学(武汉)自动化学院,湖北武汉430074 [3]中南民族大学电子信息工程学院,湖北武汉430074

出　　处：《现代电子技术》2024年第20期51-56,共6页Modern Electronics Technique

基　　金：国家自然科学基金项目:多功能综合射频传感网络无锚点协同定位(62201621);湖北省重点研发计划项目:基于能量与信息同步传输的智能化多源异构传感技术研究(2023BAB082);2023年教育部产学合作协同育人项目:新工科背景下软硬融合的测量技术师资培训(230806261091548)。

摘　　要：针对变电站变压器冷却油流速的高精度测量问题,设计一种基于超声波时差法的非接触式油体流速无线监测系统。产生中心频率为1 MHz的高功率脉冲信号,驱动压电式陶瓷超声波换能器向冷却油发射连续超声波;对超声波回波信号进行放大、滤波和整形后,采用高精度时间测量芯片FS1022测量初始脉冲信号和调理后的回波脉冲信号的时差,通过计算顺流和逆流时差得到流速,并将数据通过低功耗蓝牙发送至云端。实验结果表明:系统的通信范围在15 m内时数据包投递率高于90%;在直径为50~150 mm的铸铁管道中,超声波传播时间的测量误差小于1%。所设计的冷却油流速测量系统测量精度高、速度快,且具有安装方便、不受流体电导率影响的特点,具有较高的应用价值。In allusion to the problem of high precision measurement of cooling oil velocity in substation transformer,a non-contact wireless oil velocity monitoring system based on ultrasonic time-of-flight method is designed.A high-power pulse signal with a center frequency of 1 MHz is generated to drive a piezoelectric ceramic ultrasonic transducer to emit continuous ultrasonic waves into the cooling oil.After amplifying,filtering,and shaping the ultrasonic echo signal,a high-precision time measurement chip FS1022 is used to measure the time-of-flight between the initial pulse signal and the conditioned echo pulse signal.The flow velocity is calculated by means of the time-of-flight between the downstream and upstream,and the data is transmitted to the cloud via low power consumption Bluetooth.The experimental results demonstrate that when the communication range of the system is within 15 m,the packet delivery rate is higher than 90%.The measurement error of ultrasonic propagation time is less than 1%in cast iron pipes with diameters ranging from 50 mm to 150 mm.The designed cooling oil flow rate measurement system offers high accuracy and speed,while also being easy to install and unaffected by fluid conductivity,making it highly applicable in practical settings.

关 键 词：变电站变压器 冷却油 流速测量 超声波时差法 高精度时间测量 蓝牙通信 

分 类 号：TN707-34[电子电信—电路与系统] TU992.23[建筑科学—市政工程]