Dissolved gases analysis can discover incipient fault of transformers effectively.A monitoring system based on gas photoacoustic spectroscopy detecting theory can monitor the volume fraction of CO and CO2 dissolved in transformer insulation oil.The system is equipped with infrared light source

narrow-band filter

non-resonant photo-acoustic cell and electret microphone.The modulation frequency is 15 Hz

and the limitation sensitivity of CO volume fraction detection is 3×10-6

the limitation sensitivity of CO2 volume fraction detection is 10×10-6.This system not only satisfy the guidance to the analysis and the diagnosis of dissolved gases in transformer oil

but also widens the means of detection for dissolved gases in transformer oil.It is positive to transformer maintenance.