Studies On Spectrum Analyzing Method And Measuring Technology Of Trace Moisture Of Insulation

This paper studies the mechanism of heat and mass transfer in vacuum drying of electric insulating material, the theory of mass spectroscopy, and the principle of on-line measurement. A measurement system that is composed of a new type Al2O3 resistive humidity sensor is introduced. Real results are given and they are proved to be reliable by math method.The humidity-sensitivity detector of this trace moisture monitoring system of the insulation is a new-type Al2O3 resistive humidity sensor. Through the sensor, the trace moisture signal is acquired, transformed into the digital signal via the signal transition circuit and single-chip computer system and outputted directly, and then the trace moisture on-line monitoring of the insulations during the vacuum drying is realized.The fruitful meaning of this paper lies in accomplishing the real-time monitoring of electric insulating material's trace moisture during the vacuum drying with the help of the advanced monitoring instrument, changing the traditional off-line and static test method, enhancing the drying quality of the insulations, optimizing the technical process of vacuum drying, shortening the drying time, saving energy and reducing exhaustion.