基于超声波时差法的变电站变压器冷却油流速测量OA北大核心CSTPCD

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.