To determine the type and severity of transformer faults and ensure safe and stable operation of transform-ers,an automatic monitoring technology for transformer oil soluble acetylene gas based on TDLAS spectral detection principle is proposed.Using a DBF(distributed feedback)laser to emit laser signals,wavelength modulation is com-pleted through a phase-locked amplifier to extract the second harmonic signal.The monitoring results of transformer oil soluble acetylene gas concentration are obtained through inversion calculation by the main control module and transmitted to the upper computer.The experimental results show that the technology has high accuracy and good stability in monitoring the concentration of acetylene gas,and has significant advantages in monitoring the concentra-tion of dissolved acetylene gas in transformer oil.
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