一种检测绝缘纸板微水分的电容式传感器

Capacitive sensor for on-line measuring moisture in pressboard

开发一种用于检测变压器绝缘纸板微水分的电容式传感器 ,该传感器通过感应绝缘纸板的介电常数在其干燥过程中的变化而用于在线实时检测。它灵敏度高、温度漂移小、便于安装和信号传送 ,其输出信号经处理后 ,可由微机处理并显示水的质数分数。介绍了传感器的工作原理、结构形式及相关系统。

With high sensitivity,low thermal zero drift,easy for installation and signal transmission,a capacitive sensor was developed to detect the moisture in pressboard of large transformer body.By sensing the change of dieletric constant,it can used for the on line measuring during the drying process.Signals from the sensor are amplified and transduced.A personal computer processes data and displays the mass fraction of water. Structure of the capacitive sensor,system concerned are mainly introduced.