Study on Phase Deviation of CO Affected by Water Vapor Based on Photoacoustic Spectroscopy
Photoacoustic spectroscopy device is prone to detect waveform phase delay when measuring CO gas dissolved in transformer oil,which will cause inaccurate detection of CO gas concentration,and then affect the identification of transformer fault properties.The infrared absorption peak of CO gas is analyzed and screened;a photoacoustic spectroscopy platform for measuring CO gas is set up,and the phase deviation of photoacoustic spectroscopy detection of CO gas under different water vapor content is measured experimentally.The results show that adding a proper amount of water vapor in CO gas can improve the accuracy of CO gas detection.When the dew point temperature is 14℃and the water vapor content is 1.574 4%,the accuracy of CO gas detection is the highest.If the water vapor can not be added,the deviation phase can be calculated by formula,and the actual detected CO gas waveform can be adjusted to improve the accuracy of measurement.